7Baggers

IDACORP, Inc
(NYSE:IDA) 

IDA stock logo

IDACORP, Inc. engages in the generation, transmission, distribution, purchase, and sale of electric energy in the United States. The company operates 17 hydropower generating plants located in southern Idaho and eastern Oregon; three natural gas-fired plants in southern Idaho; and interests in two c...

Founded: 1998
Full Time Employees: 1,985
Sector: Utilities
Industry: Utilities-Regulated Electric

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    Unit: USD2026-03-31 2025-12-31 2025-09-30 2025-06-30 2025-03-31 2024-12-31 2024-09-30 2024-06-30 2024-03-31 2023-12-31 2023-09-30 2023-06-30 2023-03-31 2022-12-31 2022-09-30 2022-06-30 2022-03-31 2021-12-31 2021-09-30 2021-06-30 2021-03-31 2020-12-31 2020-09-30 2020-06-30 2020-03-31 2019-12-31 2019-09-30 2019-06-30 2019-03-31 2018-12-31 2018-09-30 2018-06-30 2018-03-31 2017-12-31 2017-09-30 2017-06-30 2017-03-31 2016-12-31 2016-09-30 2016-06-30 2016-03-31 2015-12-31 2015-09-30 2015-06-30 2015-03-31 2014-12-31 2014-09-30 2014-06-30 2014-03-31 2013-12-31 2013-09-30 2013-06-30 2013-03-31 2012-12-31 2012-09-30 2012-06-30 2012-03-31 2011-12-31 2011-09-30 2011-06-30 2011-03-31 2010-12-31 2010-09-30 2010-06-30 2010-03-31 2009-12-31 2009-09-30 2009-03-31 2008-09-30 2008-06-30 2008-03-31 2007-12-31 2007-09-30 2007-06-30 2007-03-31 2006-12-31 2006-09-30 2006-06-30 2006-03-31 2005-12-31 2005-09-30 2005-06-30 2005-03-31 2004-12-31 2004-09-30 2004-06-30 2004-03-31 2003-12-31 2003-09-30 2003-06-30 2003-03-31 2002-12-31 2002-09-30 
                                                                                                 
      operating revenues:
                                                                                                 
      electric utility revenues
    402,762,000 404,436,000 523,549,000 449,672,000 431,952,000 397,359,000 527,487,000 449,819,000 448,299,000 411,194,000 509,635,000 412,727,000 429,338,000 422,350,000 517,101,000 357,668,000 343,921,000 334,431,000 446,353,000 359,058,000 315,568,000 315,016,000 424,170,000 317,666,000 290,488,000 292,366,000 385,028,000 315,774,000 349,771,000 311,067,000 407,355,000 338,699,000 309,461,000                                                             
      other
    650,000 807,000 868,000 1,208,000 505,000 772,000 1,040,000 1,220,000 637,000 759,000 1,271,000 1,111,000 321,000 608,000 911,000 1,055,000 367,000 581,000 591,000 1,016,000 486,000 678,000 1,091,000 1,100,000 520,000 482,000 1,292,000 1,121,000 548,000 825,000 1,446,000 1,253,000 646,000 1,106,000 1,669,000 1,238,000 580,000 681,000 571,000 1,025,000 390,000 507,000 648,000 1,007,000 621,000 856,000 1,490,000 1,128,000 399,000 661,000 803,000 1,092,000 560,000 863,000 1,262,000 1,154,000 657,000 952,000 1,585,000 1,059,000 432,000 623,000 889,000 963,000 503,000 762,000 1,381,000 545,000 1,609,000 1,281,000 644,000 1,017,000 947,000 1,246,000 783,000 187,247,000 1,733,000 1,787,000 6,367,000 5,817,000 4,910,000 5,763,000 5,314,000 6,572,000 5,641,000 4,972,000 4,500,000 4,578,000 7,174,000 3,701,000 4,913,000 1,350,000 3,000,000 
      total operating revenues
    403,412,000 405,243,000 524,417,000 450,880,000 432,457,000 398,131,000 528,527,000 451,039,000 448,936,000 411,953,000 510,906,000 413,838,000 429,659,000 422,958,000 518,012,000 358,723,000 344,288,000 335,012,000 446,944,000 360,074,000 316,054,000 315,694,000 425,261,000 318,766,000 291,008,000 292,848,000 386,320,000 316,895,000 350,319,000 311,892,000 408,801,000 339,952,000 310,107,000 305,612,000 408,324,000 333,006,000 302,544,000 293,583,000 372,045,000 315,436,000 280,956,000 285,400,000 369,165,000 336,328,000 279,395,000 289,821,000 382,201,000 317,783,000 292,719,000 296,230,000 381,107,000 303,948,000 264,928,000 250,800,000 334,019,000 254,701,000 241,140,000 230,649,000 309,630,000 234,983,000 251,494,000 231,956,000 309,357,000 241,753,000 252,963,000 253,083,000 324,509,000 228,574,000 299,716,000 230,226,000 213,440,000 197,446,000 261,463,000 213,772,000 206,711,000 178,966,000 230,532,000                 
      operating expenses:
                                                                                                 
      electric utility:
                                                                                                 
      purchased power
    65,081,000 108,299,000 121,276,000 88,777,000 74,109,000 103,222,000 114,578,000 95,383,000 111,899,000 96,127,000 142,851,000 91,460,000 171,093,000 174,310,000 192,884,000 91,727,000 85,424,000 91,799,000 137,788,000 96,116,000 67,988,000 70,329,000 104,113,000 61,774,000 61,201,000 70,754,000 93,618,000 58,063,000 62,831,000 76,513,000 92,393,000 62,980,000 61,928,000 62,675,000 75,653,000 61,506,000 49,116,000 75,089,000 74,448,000 48,111,000 48,115,000 60,279,000 71,890,000 51,336,000 42,965,000 63,337,000 75,058,000 62,437,000 43,796,000 54,482,000 74,088,000 49,151,000 42,857,000 45,909,000 71,570,000 45,178,000 34,277,000 35,678,000 66,141,000 36,423,000 25,094,000 30,019,000 62,227,000 30,349,000 21,174,000 29,199,000 73,483,000 32,795,000 79,513,000 50,089,000 45,299,000 48,091,000 110,108,000 80,467,000 50,817,000 53,781,000 98,926,000                 
      fuel expense
    63,729,000 73,998,000 74,992,000 34,845,000 69,401,000 70,793,000 73,471,000 22,699,000 92,241,000 83,488,000 71,723,000 31,113,000 89,080,000 86,460,000 63,631,000 34,417,000 45,702,000 56,648,000 59,406,000 31,191,000 33,306,000 51,566,000 59,745,000 31,414,000 30,015,000 37,295,000 46,881,000 20,826,000 51,870,000 30,325,000 53,623,000 21,515,000 27,735,000 34,632,000 54,529,000 20,416,000 36,252,000 39,834,000 73,925,000 29,968,000 35,764,000 41,969,000 66,385,000 46,401,000 31,476,000 44,382,000 67,088,000 34,443,000 55,327,000 58,581,000 64,858,000 41,878,000 49,166,000 49,399,000 55,978,000 21,285,000 32,751,000 40,741,000 41,195,000 19,704,000 29,902,000 43,590,000 51,339,000 27,558,000 37,187,000 36,428,000 49,530,000 39,133,000 46,467,000 28,681,000 37,237,000 32,598,000 43,291,000 27,520,000 30,913,000 31,162,000 34,933,000                 
      power cost adjustment
    -9,293,000 -32,970,000 -18,295,000 28,577,000 47,685,000 -12,540,000 20,779,000 59,156,000 22,363,000 2,694,000 5,899,000 49,629,000 -51,337,000 -69,028,000 -30,806,000 -426,000 -400,000 -24,867,000 -22,713,000 -7,934,000 5,671,000 -19,248,000 -9,533,000 -1,536,000 -3,391,000 -23,888,000 -16,412,000 16,122,000 26,225,000 1,679,000 -5,075,000 19,963,000 25,538,000 816,000 10,979,000 16,742,000 23,487,000 -17,244,000 -18,342,000 16,903,000 13,354,000 -9,606,000 -11,914,000 10,531,000 27,755,000 -1,261,000 -668,000 9,141,000 15,023,000 -4,568,000 -6,960,000 -13,299,000 -14,711,000 -24,016,000 -42,871,000 -3,211,000 9,008,000 1,879,000 -10,189,000 15,501,000 31,306,000 -4,235,000 -20,934,000 28,071,000 48,324,000 22,474,000 1,614,000 15,859,000 -20,105,000 -829,000 -17,744,000 -13,674,000 -43,749,000 -42,172,000 -21,536,000 -22,598,000 -54,995,000                 
      other operations and maintenance
    126,126,000 115,166,000 120,398,000 121,966,000 113,007,000 128,051,000 116,168,000 110,903,000 105,829,000 114,867,000 95,824,000 97,123,000 92,041,000 106,053,000 100,679,000 100,556,000 92,086,000 99,429,000 87,720,000 88,490,000 85,657,000 96,337,000 82,782,000 83,144,000 89,808,000 92,706,000 87,151,000 87,007,000 88,906,000 94,381,000 91,563,000 92,314,000 86,198,000 90,280,000 84,197,000 87,485,000 87,762,000 92,080,000 87,090,000 87,120,000 85,603,000 86,817,000 83,972,000 87,843,000 83,515,000 102,359,000 84,236,000 87,452,000 80,521,000 101,458,000 84,471,000 83,154,000 79,785,000 94,546,000 89,968,000 86,005,000 78,514,000 97,945,000 84,562,000 85,472,000 70,661,000 74,766,000 71,939,000 75,125,000 72,094,000 80,719,000 68,970,000 68,769,000 74,778,000 75,617,000 68,927,000 70,640,000 69,154,000 78,888,000 69,942,000 48,477,250 62,395,000                 
      energy efficiency programs
    6,171,000 11,672,000 7,460,000 6,115,000 5,232,000 10,881,000 5,283,000 7,126,000 4,291,000 9,683,000 10,498,000 6,552,000 5,215,000 11,707,000 8,292,000 6,609,000 6,589,000 7,329,000 6,906,000 6,658,000 9,027,000 10,521,000 10,530,000 11,953,000 9,475,000 10,120,000 8,438,000 11,458,000 10,112,000 9,995,000 9,309,000 8,802,000 7,597,000 12,515,000 9,883,000 10,515,000 6,327,000 9,498,000 9,102,000 8,903,000 6,251,000 10,678,000 7,645,000 7,867,000 4,341,000 9,273,000 5,537,000 7,620,000 4,724,000 5,357,000 6,077,000 19,732,000 4,470,000 6,329,000 8,410,000 8,084,000 4,477,000 6,652,000 18,504,000 5,796,000 6,711,000 10,836,000 19,549,000 8,765,000 5,034,000 6,888,000 12,202,000 4,057,000                          
      depreciation and amortization
    65,519,000 65,665,000 64,493,000 61,128,000                                                                                          
      other electric utility operating expenses
    4,130,000 7,355,000 8,112,000 8,263,000 7,682,000 -3,684,000 7,453,000 -2,981,000 8,008,000 15,381,000 6,297,000 7,846,000 9,028,000 10,781,000 8,780,000 8,865,000 8,901,000 7,380,000 8,959,000 9,007,000 9,327,000                                                                         
      total electric utility operating expenses
    321,463,000 276,251,750 378,436,000 349,671,000 376,901,000 284,945,500 394,120,000 347,018,000 398,644,000 268,816,250 383,924,000 330,831,000 360,511,000 237,187,000 389,411,000 276,578,000 282,759,000 210,905,000 322,174,000 267,155,000 254,291,000                                                                         
      total operating expenses
    322,203,000 351,590,000 379,596,000 350,307,000 377,528,000 356,867,000 394,818,000 347,770,000 399,340,000 375,161,000 384,618,000 331,544,000 361,556,000 366,178,000 389,788,000 277,217,000 283,620,000 283,066,000 322,752,000 267,670,000 254,945,000 261,952,000 300,491,000 239,326,000 239,438,000 238,578,000 272,164,000 245,115,000 292,200,000 263,626,000 293,568,000 257,117,000 259,518,000 252,099,000 287,410,000 253,896,000 251,729,000 240,506,000 274,117,000 238,483,000 237,138,000 236,849,000 264,501,000 250,352,000 236,491,000 262,235,000 276,479,000 245,974,000 244,141,000 258,887,000 265,548,000 224,542,000 205,495,000 220,686,000 222,676,000 195,901,000 198,796,000 222,184,000 238,237,000 200,684,000 201,403,000 192,931,000 220,364,000 205,148,000 218,916,000 214,210,000 244,906,000 192,940,000 218,139,000 189,697,000 168,684,000 173,651,000 213,533,000 177,200,000 162,932,000 151,147,000 173,876,000                 
      operating income
    81,209,000 53,653,000 144,821,000 100,573,000 54,929,000 41,264,000 133,709,000 103,269,000 49,596,000 36,792,000 126,288,000 82,294,000 68,103,000 56,780,000 128,224,000 81,506,000 60,668,000 51,946,000 124,192,000 92,404,000 61,109,000 53,742,000 124,770,000 79,440,000 51,570,000 54,270,000 114,156,000 71,780,000 58,119,000 48,266,000 115,233,000 82,835,000 50,589,000 53,513,000 120,914,000 79,110,000 50,815,000 53,077,000 97,928,000 76,953,000 43,818,000 48,551,000 104,664,000 85,976,000 42,904,000 27,586,000 105,722,000 71,809,000 48,578,000 37,343,000 115,559,000 79,406,000 59,433,000 30,114,000 111,343,000 58,800,000 42,344,000 8,465,000 71,393,000 34,299,000 50,091,000 39,025,000 88,993,000 36,605,000 34,047,000                             
      yoy
    47.84% 30.02% 8.31% -2.61% 10.75% 12.15% 5.88% 25.49% -27.18% -35.20% -1.51% 0.97% 12.26% 9.31% 3.25% -11.79% -0.72% -3.34% -0.46% 16.32% 18.50% -0.97% 9.30% 10.67% -11.27% 12.44% -0.93% -13.35% 14.88% -9.81% -4.70% 4.71% -0.44% 0.82% 23.47% 2.80% 15.97% 9.32% -6.44% -10.49% 2.13% 76.00% -1.00% 19.73% -11.68% -26.13% -8.51% -9.57% -18.26% 24.01% 3.79% 35.04% 40.36% 255.75% 55.96% 71.43% -15.47% -78.31% -19.78% -6.30% 47.12%                                 
      qoq
    51.36% -62.95% 44.00% 83.10% 33.12% -69.14% 29.48% 108.22% 34.80% -70.87% 53.46% 20.84% 19.94% -55.72% 57.32% 34.35% 16.79% -58.17% 34.40% 51.21% 13.71% -56.93% 57.06% 54.04% -4.98% -52.46% 59.04% 23.51% 20.41% -58.11% 39.11% 63.74% -5.46% -55.74% 52.84% 55.68% -4.26% -45.80% 27.26% 75.62% -9.75% -53.61% 21.74% 100.39% 55.53% -73.91% 47.23% 47.82% 30.09% -67.68% 45.53% 33.61% 97.36% -72.95% 89.36% 38.86% 400.22% -88.14% 108.15% -31.53% 28.36% -56.15% 143.12% 7.51%                              
      nonoperating expense:
                                                                                                 
      allowance for equity funds used during construction
    -19,604,000 -17,312,000 -15,569,000 -15,166,000 -14,441,000 -13,628,000 -15,179,000 -13,279,000 -11,152,000 -11,096,000 -11,044,000 -11,173,000 -9,908,000 -9,413,000 -9,461,000 -9,287,000 -9,123,000 -8,060,000 -7,913,000 -7,795,000 -7,769,000 -51,342,000 7,369,000 7,149,000 7,272,000 7,255,000 6,803,000 6,699,000 6,356,000 6,288,000 6,047,000 5,985,000 6,033,000 4,229,000 5,712,000 5,611,000 5,232,000 5,878,000 5,931,000 5,238,000 4,985,000 5,566,000 5,654,000 5,378,000 5,187,000 4,749,000 4,645,000 4,459,000 4,079,000 3,982,000 3,734,000 3,528,000 3,615,000                                         
      earnings of unconsolidated equity-method investments
    -746,000 -714,000 -2,185,000 -1,306,000 -717,000 -659,000 -1,978,000 -1,277,000 -625,000 -3,039,000 -4,195,000 -2,739,000 -2,454,000 -2,817,000 -4,098,000 -2,288,000 -2,308,000 -2,739,000 -4,066,000 -2,313,000 -2,317,000 -20,476,000 3,960,000 2,687,000 2,316,000 2,825,000 4,166,000 2,997,000 2,381,000     4,105,000 5,232,000 592,000  -779,000 12,324,000 1,367,000  2,492,000 5,527,000 3,270,000 -160,000 3,464,000 6,414,000 1,510,000 983,000 11,368,000 2,758,000  107,000    1,419,000 -914,250 2,085,000   361,000 3,442,000                 146,000 872,000  663,000           
      interest on long-term debt and finance leases
    47,773,000 46,196,000 46,244,000 44,321,000                                                                                          
      other interest
    7,352,000 7,777,000 7,847,000 7,368,000 6,481,000 6,559,000 6,353,000 6,075,000 5,467,000 5,318,000 5,572,000 4,609,000 4,755,000 4,166,000 4,188,000 3,860,000 3,815,000 3,752,000 3,664,000 3,611,000 3,519,000 3,741,000 3,642,000 3,557,000 3,812,000 3,835,000 3,748,000 3,685,000 3,453,000 3,381,000 3,189,000 2,162,000 2,958,000 2,944,000 2,827,000 2,756,000 2,714,000 2,686,000 2,605,000 2,567,000 2,415,000 2,438,000 2,256,000 2,199,000 2,029,000 1,989,000 1,908,000 1,946,000 1,859,000 1,907,000 1,812,000 1,732,000 1,752,000               836,000 1,310,000 1,313,000 596,000 -501,000 763,000 1,514,000 1,604,000    1,090,000 1,362,000 609,000 815,000 455,000 738,000 602,000 1,585,000 453,000 414,000 407,000 966,000 1,045,000 -155,000 4,000,000 
      allowance for borrowed funds used during construction
    -10,972,000 -10,136,000 -9,207,000 -9,217,000 -7,651,000 -7,267,000 -7,639,000 -6,920,000 -5,959,000 -5,721,000 -4,903,000 -5,161,000 -4,228,000 -3,515,000 -3,534,000 -3,481,000 -3,385,000 -2,984,000 -2,985,000 -3,019,000 -3,005,000 -2,993,000 -2,969,000 -2,886,000 -2,730,000 -2,714,000 -2,666,000 -2,733,000 -2,590,000 -2,567,000 -2,506,000 -2,606,000 -2,473,000 -1,588,000 -2,385,000 -2,408,000 -2,312,000 -2,968,000 -2,589,000 -2,393,000 -2,244,000 -2,494,000 -2,593,000 -2,592,000 -2,365,000 -2,177,000 -2,178,000 -2,145,000 -1,964,000 -1,952,000 -1,904,000 -1,876,000 -1,931,000                                         
      other income
    -11,063,000 -13,640,000 -14,604,000 -14,872,000 -14,106,000 -15,065,000 -13,478,000 -12,545,000 -14,165,000 -6,222,500 -7,924,000 -8,816,000 -8,149,000 -1,551,500 -3,042,000 -1,551,000 -1,610,000 -394,000 -873,000 -460,000 -241,000 673,000 716,000 1,043,000 932,000 1,503,000 1,825,000 1,060,000 2,114,000 49,750 350,000 309,000 -459,000 2,061,000 2,256,000 2,371,000 2,397,000 2,800,000 2,681,000 2,189,000 2,204,000 2,105,000 1,222,000 1,871,000 1,961,000 1,595,000 1,193,000 1,252,000 2,288,000 13,031,000 1,567,000 1,588,000 826,000 -11,882,000 2,928,000 6,571,000 6,593,000 5,620,000 6,010,000 5,041,000 4,538,000 12,114,000 1,462,000 749,000 840,000 3,040,000 1,879,000 6,921,000 1,144,000 1,140,000 1,048,000 6,657,000 4,616,000 582,000 2,588,000 -3,603,000 4,431,000 5,080,000 4,689,000 24,050,000 3,763,000 3,355,000 4,273,000 -6,171,000 8,102,000 17,491,000 6,357,000 18,280,000 2,131,000 1,402,000 2,600,000 -12,991,000  
      total nonoperating expense
    12,740,000 12,171,000 12,526,000 11,128,000 7,734,000 7,088,000 3,511,000 5,362,000 6,874,000 7,138,000 6,867,000 5,299,000 4,984,000 6,545,000 6,146,000 8,627,000 8,458,000 15,722,000 8,863,000 11,060,000 11,223,000                                                                         
      income before income taxes
    68,469,000 41,482,000 132,295,000 89,445,000 47,195,000 34,176,000 130,198,000 97,907,000 42,722,000 29,654,000 119,421,000 76,995,000 63,119,000 50,235,000 122,078,000 72,879,000 52,210,000 36,224,000 115,329,000 81,344,000 49,886,000 43,083,000 114,647,000 67,592,000 41,346,000 45,074,000 105,379,000 60,428,000 46,953,000 29,749,000 106,459,000 69,698,000 39,005,000 42,251,000 113,372,000 67,036,000 39,189,000 40,961,000 98,552,000 65,107,000 29,897,000 38,157,000 96,790,000 75,832,000 29,455,000 17,443,000 98,103,000 59,088,000 35,892,000 45,626,000 102,823,000 61,580,000 44,491,000 19,716,000 96,174,000 46,007,000 33,151,000 988,000 62,042,000 17,325,000 34,376,000 24,720,000 77,240,000 22,608,000 17,162,000 20,074,000 68,437,000 25,482,000 67,548,000 24,456,000 27,300,000 11,135,000 33,486,000 21,902,000 29,478,000 29,751,000 43,184,000 30,393,000 31,840,000 11,270,000 31,162,000 9,949,000 24,200,000 9,076,000 5,181,000 9,613,000 24,344,000 -4,870,000 34,280,000 -879,000 -3,072,000 -15,475,000  
      income tax expense
    411,000 -2,255,000 7,686,000 -6,681,000  -3,823,000 16,358,000 8,063,000 -5,546,000 -1,704,000 13,774,000 8,131,000 7,095,000 8,076,000 15,450,000 8,291,000 6,026,000 3,380,000 17,376,000 11,070,000 5,086,000 5,534,000 12,345,000 6,933,000 3,888,000 -1,999,000 15,161,000 7,028,000 4,316,000 3,520,000 3,868,000 7,105,000 2,894,000 3,240,000 22,296,000 16,940,000 6,183,000 7,807,000 15,535,000 8,721,000 4,367,000 6,484,000 23,523,000 9,642,000 6,111,000 -17,196,000 10,869,000 14,391,000 8,707,000 14,532,250 31,088,000 15,930,000 11,111,000    8,333,000 -11,034,250 -45,372,000  4,888,000    1,305,000 -3,338,000 13,730,000 6,796,000 15,809,000 6,941,000 5,584,000 840,000 4,555,000 3,437,000 4,898,000 17,942,000 10,692,000 7,720,000 6,364,000    1,134,000    4,685,000 -8,624,000 -12,495,000     
      net income
    68,058,000 43,737,000 124,609,000 96,126,000 59,661,000 37,999,000 113,840,000 89,844,000 48,268,000 31,358,000 105,647,000 68,864,000 56,024,000 42,159,000 106,628,000 64,588,000 46,184,000 32,844,000 97,953,000 70,274,000 44,800,000 37,549,000 102,302,000 60,659,000 37,458,000 47,073,000 90,218,000 53,400,000 42,637,000 26,229,000 102,591,000 62,593,000 36,111,000 39,011,000 91,076,000 50,096,000 33,006,000 33,154,000 83,017,000 56,386,000 25,530,000 31,673,000 73,267,000 66,190,000 23,344,000 34,639,000 87,234,000 44,697,000 27,185,000 31,529,000 71,735,000 45,650,000 33,380,000 16,415,000 92,264,000 35,438,000 24,818,000 8,984,000 107,414,000 20,977,000 29,488,000 20,241,000 67,125,000 39,237,000 15,857,000 23,412,000 54,707,000 18,686,000 51,739,000 17,515,000 21,716,000 10,295,000 28,931,000 18,465,000 24,647,000 4,608,000 43,989,000 19,856,000 25,476,000 7,526,000 23,617,000 9,451,000 23,066,000 14,266,000 26,067,000 12,992,000 19,659,000 3,754,000 46,775,000 -879,000 -3,072,000 -3,328,000 37,000,000 
      yoy
    14.07% 15.10% 9.46% 6.99% 23.60% 21.18% 7.76% 30.47% -13.84% -25.62% -0.92% 6.62% 21.31% 28.36% 8.86% -8.09% 3.09% -12.53% -4.25% 15.85% 19.60% -20.23% 13.39% 13.59% -12.15% 79.47% -12.06% -14.69% 18.07% -32.77% 12.64% 24.95% 9.41% 17.67% 9.71% -11.16% 29.28% 4.68% 13.31% -14.81% 9.36% -8.56% -16.01% 48.09% -14.13% 9.86% 21.61% -2.09% -18.56% 92.07% -22.25% 28.82% 34.50% 82.71% -14.10% 68.94% -15.84% -55.61% 60.02% -46.54% 85.96% -13.54% 22.70% 109.98% -69.35% 33.67% 151.92% 81.51% 78.84% -5.14% -11.89% 123.42% -34.23% -7.01% -3.25% -38.77% 86.26% 110.09% 10.45% -47.25% -9.40% -27.26% 17.33% 280.02% -44.27% -1578.04% -739.94% -212.80% 26.42%     
      qoq
    55.61% -64.90% 29.63% 61.12% 57.01% -66.62% 26.71% 86.14% 53.93% -70.32% 53.41% 22.92% 32.89% -60.46% 65.09% 39.85% 40.62% -66.47% 39.39% 56.86% 19.31% -63.30% 68.65% 61.94% -20.43% -47.82% 68.95% 25.24% 62.56% -74.43% 63.90% 73.33% -7.43% -57.17% 81.80% 51.78% -0.45% -60.06% 47.23% 120.86% -19.40% -56.77% 10.69% 183.54% -32.61% -60.29% 95.17% 64.42% -13.78% -56.05% 57.14% 36.76% 103.35% -82.21% 160.35% 42.79% 176.25% -91.64% 412.06% -28.86% 45.68% -69.85% 71.08% 147.44% -32.27% -57.20% 192.77% -63.88% 195.40% -19.35% 110.94% -64.42% 56.68% -25.08% 434.87% -89.52% 121.54% -22.06% 238.51% -68.13% 149.89% -59.03% 61.69% -45.27% 100.64% -33.91% 423.68% -91.97% -5421.39% -71.39% -7.69% -108.99%  
      income attributable to noncontrolling interests
    -77,000 -132,750 -172,000 -345,000 -14,000 -163,500 -235,000 -324,000  -149,750 -383,000 -290,000  -118,250 -248,000 -301,000  -69,000 -56,000 -251,000  -127,250 -271,000 -270,000  -134,250 -342,000 -244,000                                                                  
      net income attributable to idacorp, inc.
    67,981,000 43,607,000 124,437,000 95,781,000 59,647,000 37,876,000 113,605,000 89,520,000 48,173,000 31,259,000 105,264,000 68,574,000 56,098,000 42,054,000 106,380,000 64,287,000 46,260,000 32,798,000 97,897,000 70,023,000 44,831,000 37,507,000 102,031,000 60,389,000 37,490,000 47,136,000 89,876,000 53,156,000 42,686,000 26,140,000 102,231,000 62,288,000 36,142,000 38,852,000 90,634,000 49,831,000 33,102,000 33,213,000 83,100,000 56,246,000 25,729,000 31,832,000 73,336,000 66,080,000 23,430,000 34,648,000 86,889,000 44,540,000 27,404,000 31,621,000 71,750,000 45,513,000 33,533,000 16,462,000 92,069,000 35,301,000 24,930,000 8,985,000 107,067,000 20,901,000 29,740,000 20,391,000 67,135,000 39,209,000 16,063,000 23,513,000 54,478,000 18,884,000                          
      weighted-average common shares outstanding - basic
    55,023,000 54,235,000 54,172,000 54,159,000 54,110,000 52,543,000 53,386,000 52,170,000 50,764,000 50,717,000 50,726,000 50,725,000 50,688,000 50,658,000 50,668,000 50,668,000 50,632,000 50,599,000 50,609,000 50,609,000 50,567,000 50,538,000 50,541,000 50,551,000 50,517,000 50,502,000 50,499,000 50,499,000 50,509,000 50,432,000 50,434,000 50,435,000 50,425,000 50,361,000 50,362,000 50,363,000 50,356,000 50,298,000 50,296,000 50,302,000 50,299,000 50,220,000 50,219,000 50,222,000 50,220,000 50,131,000 50,129,000 50,133,000 50,131,000 50,052,000 50,056,000 50,056,000 50,039,000 49,930,000 49,966,000 49,927,000 49,860,000 49,457,000 49,520,000 49,420,000 49,290,000 48,193,000 48,086,000  47,773,000 47,124,000 47,068,000 46,831,000 44,998,000 44,924,000 44,847,000 44,151,000 44,417,000 43,751,000 43,687,000  42,678,000 42,557,000                
      weighted-average common shares outstanding - diluted
    56,289,000 54,806,000 55,055,000 54,380,000 54,126,000 52,615,000 53,485,000 52,236,000 50,792,000 50,806,000 50,805,000 50,758,000 50,723,000 50,699,000 50,722,000 50,687,000 50,660,000 50,645,000 50,681,000 50,622,000 50,580,000 50,572,000 50,576,000 50,567,000 50,527,000 50,537,000 50,558,000 50,507,000 50,518,000 50,510,000 50,565,000 50,481,000 50,463,000 50,424,000 50,421,000 50,407,000 50,397,000 50,373,000 50,393,000 50,355,000 50,337,000 50,292,000 50,324,000 50,258,000 50,260,000 50,199,000 50,220,000 50,156,000 50,175,000 50,126,000 50,153,000 50,108,000 50,064,000 50,010,000 50,080,000 49,984,000 49,905,000 49,558,000 49,622,000 49,516,000 49,356,000 48,340,000 48,252,000  47,885,000 47,182,000 47,141,000 46,876,000 45,194,000 45,096,000 45,004,000 44,291,000 44,543,000 43,884,000 43,820,000  42,863 42,702                
      earnings per share of common stock:
                                                                                                 
      earnings attributable to idacorp, inc. - basic
    1.24 0.79 2.3 1.77 1.1 0.68 2.13 1.72 0.95 0.62 2.08 1.35 1.11 0.83 2.1 1.27 0.91 0.64 1.93 1.38 0.89 0.74 2.02 1.19 0.74 0.93 1.78 1.05 0.85 0.52 2.03 1.24 0.72 0.77 1.8 0.99 0.66 0.66 1.65 1.12 0.51 0.64 1.46 1.32 0.47 0.69 1.73 0.89 0.55 0.63 1.43 0.91 0.67 0.33 1.84 0.71 0.5 0.18 2.16 0.42 0.6 0.41 1.4                               
      earnings attributable to idacorp, inc. - diluted
    1.21 0.77 2.26 1.76 1.1 0.68 2.12 1.71 0.95 0.61 2.07 1.35 1.11 0.83 2.1 1.27 0.91 0.65 1.93 1.38 0.89 0.74 2.02 1.19 0.74 0.93 1.78 1.05 0.84 0.52 2.02 1.23 0.72 0.77 1.8 0.99 0.66 0.66 1.65 1.12 0.51 0.63 1.46 1.31 0.47 0.69 1.73 0.89 0.55 0.63 1.43 0.91 0.67 0.32 1.84 0.71 0.5 0.17 2.16 0.42 0.6 0.4 1.39                               
      depreciation
        59,785,000 58,277,000 56,388,000 54,732,000 54,013,000 52,010,000 50,832,000 47,108,000 45,391,000 44,839,000 45,951,000 34,830,000 44,457,000 44,504,000 44,108,000 43,627,000 43,315,000 42,965,000 43,243,000 42,914,000 42,526,000 43,204,000 42,601,000 41,172,000 42,234,000 42,106,000 41,668,000 41,348,000 40,068,000 39,829,000 40,259,000 45,240,000 36,763,000 36,214,000 36,036,000 35,794,000 35,617,000 35,114,000 34,639,000 34,314,000 34,043,000 33,683,000 33,476,000 32,952,000 32,875,000 33,055,000 32,538,000 32,232,000 31,910,000 31,913,000 31,607,000 29,879,000 30,542,000 30,517,000 30,115,000 29,693,000 29,464,000 29,475,000 29,137,000 28,726,000 28,583,000 28,995,000 28,837,000 25,963,000 25,717,000 26,617,000 25,750,000 26,202,000 25,967,000 25,613,000 25,290,000 25,353,000 25,289,000                 
      interest on long-term debt
        38,168,000 37,148,000 35,432,000 33,308,000 33,308,000 33,308,000 29,361,000 28,579,000 24,968,000 22,723,000 22,093,000 21,374,000 21,069,000 21,036,000 21,036,000 21,036,000 21,036,000 21,038,000 21,495,000 22,056,000 19,662,000 19,658,000 20,489,000 21,156,000 21,154,000 21,156,000 21,153,000 21,412,000 20,688,000 20,301,000 20,300,000 20,300,000 20,298,000 20,297,000 20,296,000 20,466,000 20,897,000 20,613,000 20,614,000 21,056,000 20,773,000 20,139,000 20,141,000 20,141,000 20,141,000 20,143,000 20,887,000 20,793,000 19,669,000 19,670,000 19,670,000 20,083,000 19,499,000 19,499,000 19,499,000 19,504,000 20,847,000 21,487,000 20,135,000 19,427,000 19,441,000 19,609,000 18,840,000 16,639,000 17,226,000 15,744,000 16,876,000 16,655,000 15,862,000 13,896,000 13,548,000 11,219,000 14,241,000 14,200,000 14,084,000 14,247,000 14,317,000 14,292,000 14,075,000 14,309,000 14,061,000 13,215,000 13,353,000 14,457,000 14,571,000 14,449,000 15,193,000 16,147,000 12,000,000 
      income tax benefit
        -12,466,000                                                 5,703,000 3,910,000 10,569,000      -1,302,500 10,115,000                 3,744,000 7,545,000 498,000  -5,190,000 -20,886,000 -3,379,000        
      adjustment for loss attributable to noncontrolling interests
            -95,000                        31,000    96,000 35,250 83,000      86,000    219,000 7,750 15,000 -137,000 153,000    112,000 -42,500 -347,000  252,000    206,000   198,000                          
      loss attributable to noncontrolling interests
                74,000    76,000    31,000    32,000    49,000                                                                 
      taxes other than income taxes
                         6,486,750 8,536,000 8,727,000 8,683,000 6,980,000 8,827,000 9,377,000 8,859,000 7,486,000 8,911,000 9,118,000 9,277,000 7,955,000 8,614,000 8,843,000 8,678,000 7,595,000 8,287,000 8,203,000 8,738,000 7,809,000 8,286,000 8,193,000 8,520,000 7,063,000 8,340,000 8,241,000 8,105,000 7,318,000 7,017,000 8,054,000 8,172,000 7,528,000 7,012,000 7,849,000 8,100,000 7,199,000 7,302,000 7,182,000 7,211,000 6,916,000 5,645,000 5,805,000 5,680,000 5,320,000 5,600,000 5,062,000 4,827,000 4,800,000 4,803,000 3,367,000 4,714,000 4,636,000 4,918,000 2,704,000 4,057,000                 
      total electric utility expenses
                         262,437,000 299,416,000 238,390,000 238,317,000 237,171,000 271,104,000 244,025,000 291,037,000 262,485,000 292,392,000 256,040,000 258,341,000 248,702,000 284,114,000 250,747,000 248,385,000 243,066,000 270,546,000 235,002,000 233,442,000 233,060,000 260,903,000 246,485,000 232,615,000 258,836,000 273,067,000 242,286,000 240,371,000 255,683,000 262,089,000 220,902,000 201,649,000 211,608,000 221,674,000 195,069,000 197,669,000 220,611,000 237,630,000 199,771,000 200,349,000 191,367,000 218,902,000 204,399,000 218,076,000 211,170,000 243,027,000 192,316,000 216,995,000 188,557,000 167,636,000 171,741,000 211,920,000 176,618,000 160,344,000                   
      interest expense:
                                                                                                 
      total interest expense
                         16,410,000 22,168,000 22,727,000 20,744,000 20,779,000 21,571,000 22,108,000 22,017,000 21,970,000 21,836,000 20,968,000 21,173,000 21,657,000 20,742,000 20,648,000 20,700,000 20,015,000 20,312,000 20,640,000 21,068,000 20,557,000 20,277,000 20,663,000 20,437,000 19,951,000 19,871,000 19,942,000 20,036,000 20,098,000 20,795,000 20,649,000 19,490,000 19,826,000 19,401,000 17,436,000 17,205,000 17,552,000 17,446,000 17,568,000 18,959,000 19,992,000 18,745,000 17,389,000 18,988,000 18,567,000 18,601,000 17,475,000 18,536,000 17,057,000 17,472,000 16,154,000 16,625,000 15,410,000 15,152,000 11,319,500 14,790,000                 
      earnings of equity-method investments
                                 3,054,500 6,665,000 1,537,000 4,015,000                                                             
      adjustment for income attributable to noncontrolling interests
                                 -158,250 -360,000 -305,000                      -55,000 -195,000                                       
      dividends declared per share of common stock
                                 0.443 0.59 0.59 0.59 0.413 0.55 0.55 0.55 0.383 0.51 0.51 0.51 0.353 0.47 0.47 0.47 0.323 0.43 0.43 0.43 0.285 0.38 0.38 0.38 0.38 0.33 0.33 0.33 0.3 0.3 0.3 0.3 0.3 0.3 0.3                              
      general business
                                     267,174,000 373,569,000 295,001,000 270,232,000 260,507,000 341,825,000 290,281,000 253,380,000 253,095,000 340,796,000 308,660,000 248,486,000 247,464,000 347,838,000 282,147,000 244,832,000 255,649,000 349,428,000 264,432,000 232,219,000 213,740,000 306,066,000 220,529,000 197,429,000 184,664,000 252,313,000 194,296,000 203,272,000 196,078,000 266,270,000 204,277,000 203,745,000 219,947,000 277,676,000 187,927,000 246,639,000 188,748,000 167,313,000 156,966,000 211,873,000 162,212,000 137,251,000 135,572,000 179,411,000                 
      off-system sales
                                     7,773,000 6,710,000 8,100,000 10,800,000 8,673,000 6,143,000 1,238,000 9,151,000 7,552,000 6,487,000 3,829,000 13,019,000 20,775,000 15,449,000 11,731,000 29,210,000 22,876,000 11,169,000 4,527,000 15,900,000 17,581,000 4,826,000 11,418,000 27,708,000 26,954,000 24,083,000 20,720,000 29,845,000 13,888,000 12,070,000 17,769,000 34,406,000 15,485,000 23,691,000 28,530,000 34,637,000 25,641,000 33,363,000 25,089,000 34,843,000 37,177,000 57,838,000 41,186,000 39,692,000                 
      other revenues
                                     29,559,000 26,376,000 28,667,000 20,932,000 23,722,000 23,506,000 22,892,000 18,035,000 24,246,000 21,234,000 22,832,000 17,269,000 20,726,000 17,424,000 22,777,000 18,278,000 17,044,000 19,707,000 33,897,000 16,249,000 18,616,000 21,865,000 21,600,000 15,346,000 18,079,000 31,649,000 18,908,000 17,945,000 21,367,000 30,128,000 18,744,000 14,309,000 16,889,000 21,761,000 11,572,000 16,831,000 14,556,000 12,120,000 14,374,000 13,800,000 13,137,000 10,839,000 6,794,000 9,696,000                 
      total electric utility revenues
                                     304,506,000 406,655,000 331,768,000 301,964,000 292,902,000 371,474,000 314,411,000 280,566,000 284,893,000 368,517,000 335,321,000 278,774,000 288,965,000 380,711,000 316,655,000 292,320,000 295,569,000 380,304,000 302,856,000 264,368,000 249,937,000 332,757,000 253,547,000 240,483,000 229,697,000 308,045,000 233,924,000 251,062,000 231,333,000 308,468,000 240,790,000 252,460,000 252,321,000 323,128,000 228,029,000 298,107,000 228,945,000 212,796,000 196,429,000 260,516,000 212,526,000 205,928,000                   
      adjustment for (income) loss attributable to noncontrolling interests
                                     -159,000 -442,000 -265,000        -110,000  9,000 -345,000 -157,000        -137,000    -76,000                                  
      earnings (losses) of unconsolidated equity-method investments
                                        1,445,000                 198,750 1,304,000              2,642,000             -951,000            
      adjustment for (income) loss atttributable to noncontrolling interests
                                           -140,000                                                      
      losses of unconsolidated equity-method investments
                                            -42,000           -2,293,000    -1,928,000     -1,294,000         -3,278,000 -4,036,000 -1,567,000 -380,000 -1,551,000 -1,326,000   -2,208,000                
      adjustment for loss atttributable to noncontrolling interests
                                            199,000                                                     
      adjustment for loss (income) attributable to noncontrolling interests
                                             159,000 69,000                   47,000 10,000                               
      other interest, net of afudc
                                                         -1,302,250 -269,000 -2,647,000 -2,294,000 -1,947,000 -2,053,000 -1,936,000 -1,888,000                                 
      (losses) earnings of unconsolidated equity-method investments
                                                               -4,447,000     -2,378,000                             
      income tax (benefit) expense
                                                               -3,652,000    -16,629,000                              
      other interest expense, net of afudc
                                                                 -1,495,000 -1,390,000 -2,038,000 -453,000 -1,042,000 -239,000                           
      the accompanying notes are an integral part of these statements.
                                                                                                 
      earnings (losses) of unconsolidated equity-
                                                                                                 
      method investments
                                                                   380,000                              
      adjustment for (income) loss attributable to
                                                                                                 
      noncontrolling interests
                                                                   -28,000                              
      weighted-average common shares outstanding-
                                                                                                 
      basic
                                                                   47,888,000                              
      diluted
                                                                   48,048,000                              
      earnings attributable to idacorp, inc.-basic
                                                                   0.82                              
      earnings attributable to idacorp, inc.-diluted
                                                                   0.82                              
      earnings per share of common stock
                                                                         0.39 0.48  0.65 0.42 0.56 0.525 1.03 0.47 0.6 0.18 0.56 0.22 0.55           
      earnings attributable to idacorp, inc.
                                                                    0.34   0.4                          
      dividends paid per share of common stock
                                                                    0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.225 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3         
      third-party transmission expense
                                                                     1,156,000 2,791,000 906,000                          
      gain on sale of emission allowances
                                                                     -9,000  -228,000 -158,000 -346,000   -1,872,000 -882,000  -2,064,500 -22,000                 
      operating income:
                                                                                                 
      electric utility
                                                                     41,151,000 80,101,000 35,713,000 81,112,000 40,388,000 45,160,000 24,688,000 48,596,000 35,908,000 45,584,000 38,563,750 58,216,000 46,810,000 49,229,000 31,650,000 49,355,000 29,783,000 40,867,000 29,282,000 20,605,000 18,722,000 40,429,000 24,005,000 37,883,000 27,251,000 32,555,000 33,661,000 22,000,000 
      total operating income
                                                                     38,873,000 79,603,000 35,634,000 81,577,000 40,529,000 44,756,000 23,795,000 47,930,000 36,572,000 43,779,000 37,171,000 56,656,000                 
      other income
                                                                     3,887,000 4,569,000                           
      income (losses) of unconsolidated equity-method
                                                                                                 
      investments
                                                                     162,000 2,866,000            -51,000               
      earnings attributable to idacorp inc.-basic
                                                                     0.538 1.16                           
      earnings attributable to idacorp inc.-diluted
                                                                     0.538 1.16                           
      other expense
                                                                       624,000    1,910,000 1,613,000                     
      income (losses) of unconsolidated equity-method investments
                                                                       402,000        -675,750 -444,000                 
      demand-side management
                                                                        5,956,000 3,928,000 3,364,000 4,517,000 4,307,000 2,548,000                    
      earnings per share-basic
                                                                        1.15                         
      earnings per share-diluted
                                                                        1.14                         
      income from continuing operations
                                                                          21,716,000 10,295,000 28,931,000 18,465,000 24,580,000 20,530,000 32,492,000 22,673,000                
      income from discontinued operations, net of tax
                                                                           16,750                      
      earnings per share from continuing operations
                                                                          0.48  0.65 0.42 0.56                   
      earnings per share from discontinued operations
                                                                                                 
      income (losses) from discontinued operations, net of tax
                                                                              67,000                   
      earnings (losses) per share from discontinued operations
                                                                                                 
      total electric utility revenue
                                                                               184,230,250 228,799,000                 
      total electric utility operations
                                                                               145,666,500 170,583,000                 
      other incomes
                                                                               1,686,250 2,669,000 2,655,000 1,421,000 1,013,750 1,759,000 1,193,000 1,103,000 3,813,250 4,075,000 7,632,000        
      other interest expense
                                                                               688,250 549,000 1,175,000                
      income
                                                                               1,800,250 11,497,000                 
      income (losses) from discontinued operations
                                                                               0.043 0.27                 
      losses from discontinued operations
                                                                                 -2,817,000                
      earnings (losses) of unconsolidated equity-method
                                                                                                 
      weighted-average common shares outstanding
                                                                                  42,473,000 42,279,000 42,287,000 42,230,000 42,210,000 38,361,000          
      interest expense and preferred dividends:
                                                                                                 
      preferred dividends of idaho power company
                                                                                        3,116,000 853,000 854,000 849,000 847,000 866,000 868,000 587,000 1,000,000 
      average common shares outstanding
                                                                                       9,548,250 38,191,000 38,189,000 38,200,000       
      earnings per share of common
                                                                                                 
      stock
                                                                                       0.385 0.68 0.34 0.51 0.1 1.22 -0.02 -0.08 -0.09 0.98 
      other expenses
                                                                                          3,547,000       
      interest expense and other:
                                                                                                 
      average common shares
                                                                                                 
      outstanding
                                                                                           7,000 38,200,000 38,196,000 38,141,000 -37,627,271,000 37,771,000,000 
      income taxes
                                                                                               -9,750,000 -39,000,000 
    Balance Sheets:
    Quarterly
    Annual
      Unit: USD2026-03-31 2025-12-31 2025-09-30 2025-06-30 2025-03-31 2024-12-31 2024-09-30 2024-06-30 2024-03-31 2023-12-31 2023-09-30 2023-06-30 2023-03-31 2022-12-31 2022-09-30 2022-06-30 2022-03-31 2021-12-31 2021-09-30 2021-06-30 2021-03-31 2020-12-31 2018-12-31 2013-09-30 2013-06-30 2013-03-31 2012-12-31 2012-03-31 2011-09-30 2010-12-31 2009-03-31 2007-09-30 2005-12-31 2004-03-31 2003-12-31 2003-09-30 2003-06-30 2003-03-31 2002-12-31 2002-09-30 2002-06-30 
                                               
        assets
                                               
        current assets:
                                               
        cash and cash equivalents
      337,765,000 215,718,000 333,209,000 474,488,000 634,495,000 368,865,000 427,950,000 169,559,000 157,583,000 327,429,000 445,489,000 134,779,000 357,823,000 177,577,000 226,229,000 237,886,000 218,550,000 215,243,000 299,672,000 259,965,000 240,007,000 275,116,000 267,492,000 186,870,000 136,155,000 24,460,000 26,527,000 8,857,000 31,314,000 228,677,000 89,113,000 16,652,000 1,234,000 79,637,000 75,159,000 26,194,000 20,125,000 41,534,000 42,736,000 70,000,000 47,000,000 
        receivables:
                                               
        customer
      99,400,000 97,724,000 139,079,000 128,074,000 131,397,000 114,824,000 152,452,000 132,426,000 116,033,000 107,256,000 135,021,000 112,730,000 101,081,000 114,173,000 136,705,000 90,604,000 82,122,000 78,819,000 113,647,000 84,542,000 73,360,000 72,826,000 77,178,000 111,214,000 69,130,000 78,806,000 66,111,000 68,246,000 75,540,000 62,114,000 70,919,000 71,047,000          
        other
      27,647,000 37,764,000 49,016,000 27,349,000 37,838,000 29,627,000 21,563,000 32,063,000 33,022,000 44,661,000 36,151,000 56,419,000 72,010,000 51,179,000 14,349,000 13,012,000 17,752,000 14,994,000 15,580,000 16,659,000 20,708,000 12,661,000 7,476,000 12,394,000 14,541,000 24,330,000 23,608,000 14,102,000 10,693,000 10,157,000 15,099,000 9,279,000 335,000 58,412,000 57,949,000 54,534,000 54,276,000 51,324,000 51,050,000 49,000,000 52,000,000 
        income taxes receivable
       8,669,000    13,932,000   11,077,000 24,574,000    13,734,000   4,754,000 14,770,000    2,164,000 4,356,000  232,000 1,848,000 1,753,000 786,000  12,130,000            
        accrued unbilled receivables
      78,573,000 79,931,000 90,582,000                                       
        materials and supplies
      203,341,000 201,896,000 207,103,000 211,654,000 209,049,000 201,064,000 179,693,000 165,180,000 156,317,000 140,515,000 131,616,000 121,215,000 110,037,000 92,461,000 82,699,000 78,715,000 80,203,000 77,552,000 71,801,000 70,248,000 68,294,000 64,941,000 54,987,000 52,857,000 52,347,000 52,625,000 51,037,000 48,428,000 46,558,000 45,601,000 52,778,000 43,598,000  27,487,000 21,351,000 21,595,000 22,126,000 23,216,000 22,812,000 25,000,000 25,000,000 
        fuel stock
      24,989,000 24,455,000 29,858,000 37,870,000 36,987,000 43,656,000 39,873,000 34,842,000 23,957,000 19,952,000 20,950,000 16,498,000 10,718,000 14,762,000 9,236,000 16,023,000 20,156,000 18,045,000 31,379,000 37,600,000 29,261,000 31,646,000 47,979,000 35,412,000 36,131,000 32,565,000 42,388,000 56,531,000 49,742,000 27,547,000 13,941,000 19,013,000  4,975,000 6,228,000 4,387,000 9,619,000 8,791,000 6,943,000 11,000,000 9,000,000 
        prepayments
      24,982,000 30,579,000 30,651,000 20,835,000 24,334,000 29,461,000 28,831,000 24,397,000 20,686,000 22,840,000 23,078,000 23,832,000 19,022,000 24,517,000 20,073,000 23,301,000 20,955,000 24,676,000 21,643,000 20,451,000 16,580,000 20,184,000 16,492,000 14,041,000 13,792,000 11,199,000 12,823,000 11,323,000 11,245,000 11,063,000 9,878,000 10,385,000  27,276,000 27,779,000 29,552,000 31,582,000 31,355,000 34,329,000 35,000,000 35,000,000 
        current regulatory assets
      125,333,000 136,665,000 80,803,000 61,105,000 59,429,000 89,315,000 89,823,000 135,058,000 179,727,000 226,235,000 163,818,000 174,848,000 248,693,000 80,049,000 77,506,000 98,550,000 91,196,000 71,223,000 52,072,000 61,896,000 63,027,000 63,407,000 48,707,000 63,445,000 80,441,000 84,263,000 30,078,000 35,958,000 26,438,000             
        assets held for sale
      124,482,000                                         
        total current assets
      1,046,541,000 833,404,000 960,405,000 1,079,490,000 1,216,103,000 988,455,000 1,033,358,000 814,439,000 780,281,000 1,004,054,000 1,038,152,000 733,634,000 990,933,000 693,653,000 659,668,000 693,344,000 611,898,000 595,873,000 678,185,000 672,979,000 593,892,000 642,401,000 597,640,000 566,850,000 520,570,000 384,252,000 367,253,000 323,285,000 309,255,000 460,635,000 319,455,000 291,617,000          
        investments
      151,706,000 155,002,000 154,896,000 158,055,000 156,414,000 161,340,000 161,612,000 165,946,000 156,301,000 163,971,000 157,513,000 126,839,000 120,999,000 121,352,000 110,601,000 114,048,000 117,797,000 123,824,000 122,884,000 129,000,000 122,862,000 126,948,000 101,178,000 174,749,000 178,305,000 181,255,000 189,020,000 195,978,000 192,343,000 202,944,000 185,532,000 201,532,000  196,079,000 204,474,000 203,755,000 208,437,000 205,664,000 206,348,000 204,000,000 212,000,000 
        property, plant, and equipment:
                                               
        utility plant in service
      8,173,576,000 8,249,106,000 8,333,801,000 8,228,930,000 8,016,433,000 7,957,763,000 7,669,083,000 7,476,066,000 7,351,549,000 7,291,532,000 7,148,293,000 6,984,783,000 6,876,028,000 6,828,467,000 6,734,794,000 6,680,494,000 6,566,656,000 6,509,316,000 6,442,483,000 6,392,964,000 6,321,220,000 6,283,790,000 6,103,856,000 5,035,762,000 5,001,736,000 4,940,837,000 4,915,772,000 4,476,618,000 4,451,427,000 4,332,054,000 4,077,121,000 3,712,899,000  3,229,618,000 3,220,228,000 3,164,212,000 3,134,019,000 3,107,678,000 3,086,965,000 3,044,000,000 3,020,000,000 
        accumulated provision for depreciation
      -2,582,363,000 -2,599,465,000 -2,837,096,000 -2,787,684,000 -2,755,015,000 -2,714,706,000 -2,673,078,000 -2,644,334,000 -2,613,507,000 -2,557,744,000 -2,575,485,000 -2,544,166,000 -2,509,399,000 -2,465,279,000 -2,430,604,000 -2,395,644,000 -2,327,248,000 -2,298,951,000 -2,269,836,000 -2,236,478,000 -2,224,063,000 -2,193,831,000 -2,210,781,000 -1,759,785,000 -1,737,827,000 -1,723,796,000 -1,703,159,000 -1,696,788,000 -1,669,123,000 -1,614,013,000 -1,520,896,000 -1,466,697,000  -1,258,409,000 -1,239,604,000 -1,363,765,000 -1,339,762,000 -1,320,190,000 -1,294,961,000 -1,279,000,000 -1,261,000,000 
        utility plant in service - net
      5,591,213,000 5,649,641,000 5,496,705,000 5,441,246,000 5,261,418,000 5,243,057,000 4,996,005,000 4,831,732,000 4,738,042,000 4,733,788,000 4,572,808,000 4,440,617,000 4,366,629,000 4,363,188,000 4,304,190,000 4,284,850,000 4,239,408,000 4,210,365,000 4,172,647,000 4,156,486,000 4,097,157,000 4,089,959,000 3,893,075,000 3,275,977,000 3,263,909,000 3,217,041,000 3,212,613,000 2,779,830,000 2,782,304,000 2,718,041,000 2,556,225,000 2,246,202,000          
        construction work in progress
      1,944,909,000 1,740,809,000 1,619,882,000 1,447,017,000 1,385,042,000 1,244,559,000 1,302,148,000 1,261,405,000 1,082,560,000 985,502,000 955,276,000 990,181,000 896,794,000 785,706,000 752,173,000 708,529,000 725,904,000 670,585,000 626,913,000 600,800,000 617,265,000 597,152,000 480,259,000 321,128,000 298,594,000 312,638,000 298,470,000 614,851,000 547,777,000 416,950,000 186,662,000 277,006,000  114,678,000 96,091,000 110,552,000 101,945,000 101,282,000 96,209,000 109,000,000 112,000,000 
        finance lease right-of-use assets
      216,779,000 219,612,000 222,445,000 225,278,000                                      
        utility plant held for future use
      20,637,000 19,781,000 19,281,000 17,188,000 13,187,000 13,211,000 9,878,000 9,883,000 9,425,000 9,511,000 9,491,000 8,860,000 8,778,000 7,130,000 4,090,000 4,089,000 4,410,000 4,511,000 4,095,000 4,035,000 4,109,000 4,109,000 4,751,000 7,093,000 7,101,000 7,101,000 7,101,000 7,107,000 6,974,000 7,076,000 6,653,000 3,137,000  2,438,000 2,438,000 2,705,000 2,730,000 2,732,000 2,335,000 2,000,000 2,000,000 
        other property, net of accumulated depreciation
      19,118,000 18,103,000 16,678,000 16,518,000 16,565,000 16,491,000 13,478,000 13,599,000 16,306,000 16,429,000 16,357,000 16,466,000 16,824,000 16,946,000 17,054,000 16,983,000 16,381,000 16,361,000 16,765,000 16,576,000 16,688,000 18,290,000 17,650,000 17,342,000 17,628,000 17,739,000 17,847,000 18,817,000 18,991,000 19,315,000 19,270,000 28,217,000  39,893,000 9,166,000 10,667,000 11,763,000 13,471,000 15,950,000 23,000,000 21,000,000 
        property, plant, and equipment - net
      7,792,656,000 7,647,946,000    6,517,318,000    5,745,230,000                                
        other assets:
                                               
        company-owned life insurance
      109,124,000 105,306,000 101,696,000 98,358,000 95,072,000 92,062,000 89,210,000 86,518,000 84,083,000 82,038,000 79,861,000 77,999,000 75,949,000 73,944,000 72,005,000 70,180,000 68,503,000 67,343,000 65,885,000 64,533,000 63,507,000 62,382,000 59,852,000 22,055,000 22,263,000 22,774,000 22,646,000 23,678,000 24,084,000 26,672,000 30,036,000 31,719,000  35,829,000 35,624,000 35,748,000 35,460,000 35,605,000 35,299,000 35,000,000 39,000,000 
        regulatory assets
      1,431,495,000 1,427,793,000 1,429,218,000 1,388,320,000 1,383,622,000 1,418,057,000 1,435,335,000 1,429,624,000 1,427,398,000 1,426,815,000 1,398,652,000 1,381,398,000 1,336,194,000 1,421,912,000 1,547,639,000 1,496,817,000 1,438,850,000 1,462,431,000 1,505,038,000 1,495,961,000 1,503,256,000 1,495,488,000 1,165,467,000 1,139,353,000 1,113,051,000 1,103,110,000 1,132,960,000 963,055,000 880,412,000 756,575,000 692,270,000 145,000  5,124,000 6,269,000 7,017,000 15,413,000 15,067,000 17,147,000 15,000,000 15,000,000 
        total other assets
      1,596,877,000 1,589,085,000 1,585,693,000 1,551,089,000 1,543,297,000 1,572,250,000 1,588,639,000 1,580,129,000 1,564,496,000 1,562,663,000 1,543,937,000 1,522,471,000 1,477,935,000 1,555,283,000 1,676,169,000 1,630,253,000 1,568,759,000 1,588,996,000 1,632,565,000 1,621,582,000 1,626,328,000 1,616,385,000 1,288,201,000 1,227,979,000 1,202,577,000 1,195,818,000 1,227,212,000 1,050,753,000 969,291,000 851,094,000 795,881,000 564,937,000          
        total
      10,587,780,000 10,225,437,000 10,075,985,000 9,935,881,000 9,592,026,000 9,239,363,000 9,105,118,000 8,677,133,000 8,347,411,000 8,475,918,000 8,293,534,000 7,839,068,000 7,878,892,000 7,543,258,000 7,523,945,000 7,452,096,000 7,284,557,000 7,210,515,000 7,254,054,000 7,201,458,000 7,078,301,000 7,095,244,000 6,382,754,000 5,591,118,000 5,488,684,000 5,315,844,000 5,319,516,000 4,990,621,000 4,826,935,000 4,676,055,000 4,069,678,000 3,612,648,000 1,123,232,000         
        liabilities and equity
                                               
        current liabilities:
                                               
        current maturities of long-term debt
      116,300,000 116,300,000 116,300,000   19,885,000 69,685,000 49,800,000 49,800,000 49,800,000   125,000,000  79,360,000 75,000,000        71,064,000 71,064,000 1,064,000 71,064,000 1,064,000 1,667,000 122,572,000 81,502,000 92,368,000          
        accounts payable
      281,359,000 344,870,000 317,375,000 275,934,000 267,364,000 307,133,000 241,186,000 205,587,000 199,709,000 308,504,000 227,348,000 223,653,000 201,838,000 292,719,000 184,831,000 152,569,000 121,037,000 145,980,000 126,620,000 122,834,000 81,602,000 120,576,000 110,824,000 88,835,000 77,011,000 65,309,000 90,165,000 71,275,000 90,088,000 103,100,000 53,010,000 65,805,000 3,162,000         
        taxes accrued
      23,670,000 7,532,000 45,617,000 30,557,000 18,846,000 6,981,000 38,281,000 19,319,000 13,002,000 6,854,000 36,005,000 30,640,000 17,799,000 8,565,000 25,587,000 30,712,000 20,590,000 14,229,000 58,644,000 43,073,000 34,501,000 19,508,000 12,009,000                   
        interest accrued
      35,212,000 49,547,000 36,586,000 52,020,000 37,285,000 42,681,000 32,935,000 37,056,000 32,069,000 38,292,000 21,733,000 32,026,000 21,540,000 24,060,000 19,458,000 23,924,000 19,328,000 23,959,000 19,299,000 23,944,000 19,459,000 24,030,000 23,622,000 26,409,000 23,534,000 24,157,000 22,311,000 23,434,000 23,388,000 23,937,000 24,054,000 28,165,000          
        accrued compensation
      54,500,000 77,245,000 74,782,000 63,220,000 52,467,000 70,548,000 60,555,000 49,775,000 44,378,000 64,645,000 54,028,000 47,948,000 42,340,000 59,265,000 52,026,000 49,236,000 42,154,000 55,666,000 46,508,000 43,302,000 36,972,000 52,245,000 55,121,000 35,883,000 30,984,000 26,741,000 42,343,000               
        current regulatory liabilities
      75,173,000 21,089,000 40,974,000 59,405,000 50,630,000 7,523,000 8,642,000 8,293,000 7,236,000 7,952,000 8,620,000 6,405,000 6,055,000 63,957,000 25,283,000 20,101,000 29,699,000 11,239,000 21,820,000 26,899,000 27,697,000 11,104,000 25,883,000 8,474,000 5,838,000 19,406,000 30,277,000 49,487,000 16,067,000             
        advances from customers
      195,598,000 201,743,000 185,620,000 187,445,000 183,131,000 165,229,000 101,766,000 100,907,000 105,611,000 104,297,000 103,860,000 91,262,000 87,479,000 72,222,000 68,766,000 67,400,000 65,013,000 43,472,000 40,199,000 41,544,000 34,604,000 29,341,000 20,037,000                   
        liabilities held for sale
      8,777,000                                         
        total current liabilities
      864,781,000 897,835,000 885,195,000 742,443,000 673,479,000 700,801,000 606,184,000 525,632,000 505,376,000 634,076,000 488,930,000 468,338,000 532,570,000 548,565,000 475,422,000 448,980,000 327,578,000 325,624,000 342,780,000 331,141,000 261,872,000 287,571,000 258,592,000 335,264,000 313,619,000 255,408,000 351,303,000 283,944,000 254,461,000 449,059,000 360,792,000 384,514,000          
        other liabilities:
                                               
        deferred income taxes
      800,434,000 802,885,000 780,060,000 778,904,000 786,042,000 822,231,000 863,783,000 866,822,000 874,723,000 882,724,000 878,945,000 861,478,000 867,649,000 873,916,000 828,160,000 828,758,000 837,394,000 842,375,000 772,650,000 789,215,000 794,525,000 800,251,000 699,878,000 35,056,000 28,157,000 31,885,000 56,532,000 37,359,000 3,850,000 10,715,000 14,792,000 31,549,000 27,997,000         
        regulatory liabilities
      1,002,502,000 1,031,062,000 1,009,989,000 990,779,000 987,340,000 976,803,000 888,699,000 882,318,000 869,404,000 874,601,000 815,075,000 803,547,000 799,925,000 796,644,000 797,904,000 794,753,000 791,166,000 781,695,000 783,150,000 768,416,000 755,542,000 757,730,000 738,994,000 369,729,000 360,299,000 363,424,000 355,362,000 332,153,000 332,675,000 298,094,000 282,440,000 276,086,000          
        pension and other postretirement benefits
      142,646,000 137,406,000 161,247,000 176,755,000 170,947,000 165,992,000 230,579,000 243,430,000 238,681,000 233,965,000 204,604,000 238,777,000 244,043,000 238,037,000 497,287,000 521,963,000 527,147,000 521,462,000 615,432,000 638,455,000 641,113,000 634,070,000 431,475,000 416,272,000 427,946,000 430,625,000 423,409,000 335,456,000              
        finance lease liabilities
      215,184,000 216,695,000 218,182,000 219,914,000                                      
        total other liabilities
      2,396,450,000 2,417,878,000 2,371,423,000 2,339,701,000 2,118,184,000 2,146,830,000 2,167,413,000 2,171,465,000 2,143,662,000 2,151,309,000 2,049,590,000 2,027,023,000 2,032,914,000 1,985,933,000 2,191,552,000 2,213,588,000 2,222,115,000 2,209,017,000 2,233,329,000 2,256,683,000 2,240,097,000 2,240,803,000 1,913,563,000 1,776,880,000 1,752,117,000 1,745,408,000 1,738,615,000 1,545,613,000 1,424,118,000 1,202,725,000 1,116,709,000 958,748,000          
        long-term debt
      3,677,816,000 3,331,038,000 3,330,752,000 3,446,970,000 3,447,008,000 3,053,777,000 3,053,948,000 2,776,129,000 2,775,959,000 2,775,790,000 2,826,150,000 2,482,352,000 2,483,051,000 2,194,145,000 2,071,402,000 2,075,698,000 2,050,634,000 2,000,640,000 2,000,584,000 2,000,527,000 2,000,471,000 2,000,414,000 1,834,788,000 1,615,197,000 1,615,128,000 1,535,627,000 1,466,632,000 1,486,568,000 1,487,468,000 1,488,287,000 1,279,504,000 1,061,276,000          
        commitments and contingencies
                                               
        equity:
                                               
        idacorp, inc. shareholders’ equity:
                                               
        common stock
      1,352,535,000 1,301,907,000 1,205,219,000 1,201,374,000 1,197,493,000 1,194,998,000 1,127,743,000 1,123,745,000 890,042,000 888,615,000 886,243,000 884,309,000 882,104,000 882,189,000 879,760,000 877,362,000 875,067,000 874,896,000 872,612,000 871,111,000 868,944,000 869,235,000 863,593,000 838,575,000 836,560,000 835,418,000 834,922,000 831,296,000 820,271,000             
        retained earnings
      2,304,032,000 2,284,911,000 2,289,174,000 2,211,514,000 2,162,499,000 2,149,548,000 2,158,333,000 2,089,185,000 2,042,003,000 2,036,138,000 2,047,129,000 1,982,083,000 1,953,727,000 1,937,972,000 1,936,067,000 1,867,811,000 1,841,644,000 1,833,580,000 1,838,847,000 1,776,986,000 1,742,994,000 1,734,103,000 1,531,543,000 1,034,472,000 981,822,000 955,409,000 940,968,000 849,327,000 846,873,000 733,879,000 586,408,000 540,824,000          
        accumulated other comprehensive loss
      -14,723,000 -14,944,000 -13,310,000 -13,481,000 -13,652,000 -13,592,000 -16,331,000 -16,616,000 -16,900,000 -17,184,000 -12,483,000 -12,629,000 -12,776,000 -12,922,000 -37,529,000 -38,366,000 -39,203,000 -40,040,000 -40,850,000 -41,686,000 -42,522,000 -43,358,000 -22,844,000 -13,439,000 -14,746,000 -15,470,000 -17,116,000 -9,995,000 -10,268,000 -9,568,000 -9,458,000 -5,617,000          
        total idacorp, inc. shareholders’ equity
      3,641,844,000 3,571,874,000 3,481,083,000 3,399,407,000 3,346,340,000 3,330,954,000 3,269,745,000 3,196,314,000 2,915,145,000 2,907,569,000 2,920,889,000 2,853,763,000 2,823,055,000 2,807,239,000 2,778,298,000 2,706,807,000 2,677,508,000 2,668,436,000 2,670,609,000 2,606,411,000 2,569,416,000 2,559,980,000 2,370,360,000 1,859,595,000 1,803,623,000 1,775,341,000 1,758,753,000 1,670,568,000 1,656,847,000  1,308,686,000           
        noncontrolling interests
      6,889,000 6,812,000 7,532,000 7,360,000 7,015,000 7,001,000 7,828,000 7,593,000 7,269,000 7,174,000 7,975,000 7,592,000 7,302,000 7,376,000 7,271,000 7,023,000 6,722,000 6,798,000 6,752,000 6,696,000 6,445,000 6,476,000 5,451,000 4,182,000 4,197,000 4,060,000 4,213,000 3,928,000 4,041,000             
        total equity
      3,648,733,000 3,578,686,000 3,488,615,000 3,406,767,000 3,353,355,000 3,337,955,000 3,277,573,000 3,203,907,000 2,922,414,000 2,914,743,000 2,928,864,000 2,861,355,000 2,830,357,000 2,814,615,000 2,785,569,000 2,713,830,000 2,684,230,000 2,675,234,000 2,677,361,000 2,613,107,000 2,575,861,000 2,566,456,000 2,375,811,000 1,863,777,000 1,807,820,000 1,779,401,000 1,762,966,000 1,674,496,000 1,660,888,000 1,535,984,000            
        the accompanying notes are an integral part of these statements.
                                               
        property, plant and equipment:
                                               
        property, plant and equipment - net
        7,374,991,000 7,147,247,000 6,676,212,000  6,321,509,000 6,116,619,000 5,846,333,000  5,553,932,000 5,456,124,000 5,289,025,000 5,172,970,000 5,077,507,000 5,014,451,000 4,986,103,000 4,901,822,000 4,820,420,000 4,777,897,000 4,735,219,000 4,709,510,000 4,395,735,000 3,621,540,000 3,587,232,000 3,554,519,000 3,536,031,000 3,420,605,000 3,356,046,000 3,161,382,000 2,768,810,000 2,554,562,000          
        accrued unbilled revenues
         114,601,000 73,489,000 97,711,000 93,131,000 120,783,000 81,852,000 90,521,000 81,533,000 93,000,000 70,690,000 84,862,000 75,002,000 94,757,000 59,625,000 74,843,000 61,763,000 108,913,000 54,895,000 72,461,000 69,318,000 52,445,000 86,877,000 39,731,000 51,448,000 37,078,000 49,368,000 47,964,000 35,751,000 32,766,000  23,951,000 30,869,000 28,456,000 35,404,000 28,890,000 35,714,000 29,000,000 42,000,000 
        short-term investments
                     25,000,000     25,000,000 25,000,000                    
        treasury stock
                            -1,932,000 -13,000 -13,000 -16,000 -21,000 -60,000 -29,000 -40,000 -20,000           
        american falls and milner water rights
                             16,064,000 16,324,000 16,585,000 17,909,000 18,691,000 20,275,000 22,120,000 25,008,000 29,762,000  31,585,000 31,585,000 31,585,000 31,585,000 31,585,000 31,585,000 32,000,000 31,000,000 
        long-term receivables
                             4,437,000 4,437,000 4,437,000 4,437,000 5,621,000 5,041,000 3,965,000 3,844,000 3,583,000  3,214,000 3,106,000    73,941,000 74,000,000 74,000,000 
        notes payable
                             53,000,000 61,900,000 83,750,000 69,700,000 63,000,000 51,500,000 66,900,000 150,700,000 144,813,000 60,100,000         
        income taxes accrued
                             13,802,000 9,802,000 154,000 1,005,000 2,837,000 8,785,000             
        uncertain tax positions
                                   74,436,000 4,509,000           
        idacorp, inc. shareholders' equity:
                                               
        49,419,452 and 47,925,882 shares issued, respectively)
                                   807,842,000            
        total idacorp, inc. shareholders' equity
                                   1,532,113,000            
        noncontrolling interest
                                   3,871,000 3,987,000           
        allowance for uncollectible accounts
                                    -1,482,000 -7,469,000          
        taxes receivable
                                    9,710,000 12,063,000 6,897,000         
        liabilities and shareholders’ equity
                                               
        shareholders’ equity:
                                               
        47,161,034 and 46,929,203 shares issued, respectively)
                                    731,756,000           
        total shareholders’ equity
                                    1,312,673,000           
        employee notes
                                     2,287,000  4,595,000 4,775,000       
        energy marketing assets
                                     1,829,000          
        refundable income tax deposit
                                     44,903,000          
        liabilities and shareholders' equity
                                               
        energy marketing liabilities
                                     1,973,000          
        shareholders' equity:
                                               
        44,995,710 and 43,905,458 shares issued, respectively)
                                     672,905,000          
        total shareholders' equity
                                     1,208,110,000          
        receivables
                                      1,304,000         
        investment in subsidiaries
                                      1,049,276,000         
        other assets
                                               
        intercompany notes receivable
                                      35,306,000         
        intercompany notes payable
                                      33,265,000         
        shareholders' equity
                                      1,025,251,000         
        commitments and contingent liabilities
                                               
        preferred stock of idaho power company
                                               
        accumulated other comprehensive income
                                               
        unearned compensation
                                               
        long-term receivable
                                         43,457,000 44,363,000 52,500,000    
        derivative liabilities
                                               
        derivative liabilities - long-term
                                               
      Cashflow Statements:
      Quarterly
      Annual
        Unit: USD2026-03-31 2025-12-31 2025-09-30 2025-06-30 2025-03-31 2024-12-31 2024-09-30 2024-06-30 2024-03-31 2023-12-31 2023-09-30 2023-06-30 2023-03-31 2022-12-31 2022-09-30 2022-06-30 2022-03-31 2021-12-31 2021-09-30 2021-06-30 2021-03-31 2020-12-31 2020-09-30 2020-06-30 2020-03-31 2019-12-31 2019-09-30 2019-06-30 2019-03-31 2018-12-31 2018-09-30 2018-06-30 2018-03-31 2017-12-31 2017-09-30 2017-06-30 2017-03-31 2016-12-31 2016-09-30 2016-06-30 2016-03-31 2015-12-31 2015-09-30 2015-06-30 2015-03-31 2014-12-31 2014-09-30 2014-06-30 2014-03-31 2013-12-31 2013-09-30 2013-06-30 2013-03-31 2012-12-31 2012-09-30 2012-06-30 2012-03-31 2011-12-31 2011-09-30 2011-06-30 2011-03-31 2010-12-31 2010-03-31 2009-12-31 2009-03-31 2008-09-30 2008-06-30 2008-03-31 2007-09-30 2007-06-30 2007-03-31 2006-12-31 2006-09-30 2006-06-30 2006-03-31 2005-12-31 2005-09-30 2005-06-30 2005-03-31 2004-09-30 2004-06-30 2004-03-31 2003-12-31 2003-09-30 2003-06-30 2003-03-31 2002-12-31 
                                                                                               
          operating activities:
                                                                                               
          net income
        68,058,000 43,737,000 124,609,000 96,126,000 59,661,000 37,999,000 113,840,000 89,844,000 48,268,000 31,358,000 105,647,000 68,864,000 56,024,000 42,159,000 106,628,000 64,589,000 46,184,000 32,844,000 97,954,000 70,274,000 44,800,000 37,549,000 102,302,000 60,659,000 37,458,000 47,073,000 90,218,000 53,400,000 42,637,000 26,229,000 102,590,000 62,593,000 36,111,000 39,011,000 91,076,000 50,095,000 33,006,000 33,154,000 83,018,000 56,386,000 25,530,000 31,673,000 73,268,000 66,190,000 23,344,000 34,639,000 87,233,000 44,697,000 27,185,000 31,529,000 71,735,000 45,650,000 33,380,000 16,415,000 92,264,000 35,437,000 24,818,000 8,984,000 107,413,000 20,977,000 29,488,000 20,241,000 15,857,000 23,412,000 18,686,000 51,738,000 17,515,000 21,716,000 28,931,000 18,466,000 24,647,000 18,082,000 43,989,000 19,856,000 25,476,000 7,526,000 23,618,000 9,451,000 23,066,000 26,066,000 12,992,000 19,659,000 3,754,000 46,776,000 -880,000 -3,072,000 -3,328,000 
          adjustments to reconcile net income to net cash from operating activities:
                                                                                               
          depreciation and amortization
        67,993,000 68,142,000 66,704,000 62,738,000 60,818,000 59,484,000 57,570,000 55,863,000 55,174,000 53,263,000 51,968,000 48,268,000 46,409,000 46,220,000 45,984,000 35,857,000 45,494,000 45,460,000 45,095,000 44,603,000 44,286,000 43,915,000 44,262,000 44,098,000 43,666,000 44,407,000 43,738,000 42,293,000 43,362,000 43,154,000 42,660,000 42,278,000 41,028,000 40,882,000 41,139,000 46,184,000 37,728,000 37,133,000 36,978,000 37,038,000 36,145,000 36,277,000 35,793,000 35,454,000 35,057,000 34,722,000 34,509,000 33,969,000 33,888,000 34,242,000 33,509,000 32,830,000 33,195,000 32,707,000 32,975,000 31,054,000 31,875,000 32,013,000 31,256,000 29,798,000 31,592,000 30,592,000 30,435,000 32,115,000 31,169,000 29,937,000 32,478,000 30,777,000 30,889,000 30,110,000 30,287,000 31,713,000                
          deferred income taxes and investment tax credits
        -6,720,000 18,230,000 -4,470,000 -22,271,000 -22,980,000 17,107,000 -2,346,000 -13,577,000 -18,776,000 39,313,000 15,509,000 -7,355,000 -7,854,000 16,339,000 103,000 -14,436,000 -2,517,000 27,307,000 2,763,000 -2,779,000 -3,390,000 28,138,000 -842,000 -742,000 -1,379,000 29,788,000 -1,222,000 -1,886,000 -4,291,000 30,789,000 -9,789,000 -4,801,000 -4,907,000 33,440,000 -7,023,000 2,434,000 4,394,000 5,655,000 17,704,000 5,948,000 6,425,000 13,380,000 25,577,000 -1,572,000 1,260,000 -6,192,000 20,422,000 14,861,000 -9,928,000 23,489,000 27,010,000 4,591,000 10,478,000 6,469,000 7,960,000 6,856,000 5,008,000 1,427,000 -32,346,000 -23,260,000 1,266,000 4,647,000 -23,118,000 4,238,000 14,675,000 -702,000 4,160,000 12,617,000 10,464,000 11,180,000 7,580,000 -865,000                
          changes in regulatory assets and liabilities
        -6,460,000 -60,931,000 -7,843,000 30,693,000 69,310,000 -9,523,000 40,216,000 51,403,000 32,930,000 -6,333,000 9,840,000 48,141,000 -56,396,000 -78,332,000 -10,019,000 785,000 7,873,000 -35,474,000 -7,542,000 6,478,000 2,833,000 -24,630,000 215,000 -2,159,000 -9,672,000 -26,859,000 -9,094,000 12,103,000 19,540,000 -2,781,000 5,482,000 15,691,000 30,000,000 -4,837,000 24,232,000 4,687,000 33,049,000 -19,152,000 -10,624,000 19,051,000 5,075,000 -12,077,000 -5,599,000 3,310,000 28,065,000 -4,460,000 7,082,000 8,034,000 21,479,000 -4,816,000 3,962,000 -11,046,000 -13,681,000 -28,850,000 -38,423,000 -1,781,000 15,586,000 13,001,000 2,976,000 16,218,000 35,850,000 -3,828,000 52,036,000 20,115,000 16,405,000 -25,257,000 -4,358,000 -20,466,000 -45,556,000 -46,255,000 -19,002,000 -23,244,000                
          pension and postretirement benefit plan expense
        11,287,000 11,303,000 11,303,000 11,321,000 11,287,000 11,441,000 11,572,000 11,437,000 11,350,000 6,765,000 6,764,000 6,741,000 6,885,000 7,542,000 7,260,000 7,218,000 7,266,000 12,003,000 7,280,000 7,167,000 7,367,000 7,239,000 7,253,000 7,218,000 7,260,000 6,947,000 6,963,000 6,929,000 6,965,000 11,223,000 6,995,000 7,004,000 7,034,000 7,224,000 7,174,000 7,173,000 7,340,000 7,406,000 7,391,000 7,359,000 7,425,000 7,539,000 7,537,000 7,513,000 7,618,000 23,700,000 6,990,000 6,939,000 6,998,000 23,881,000 7,354,000 6,999,000 7,673,000 16,541,000 13,485,000 7,531,000 7,673,000 27,944,000 7,382,000 5,344,000 4,553,000 4,254,000                          
          contributions to pension and postretirement benefit plans
        -1,225,000 -2,350,000 -22,399,000 -1,369,000 -1,495,000 -1,496,000 -21,351,000 -1,440,000 -1,176,000 -949,000 -40,570,000 -12,510,000 -1,308,000 -1,049,000 -31,021,000 -11,125,000 -997,000 -1,189,000 -31,074,000 -11,039,000 -918,000 -1,023,000 -30,919,000 -949,000 -12,270,000 -2,524,000 -31,368,000 -2,223,000 -12,410,000 -663,000 -20,720,000 -12,664,000 -11,852,000 -1,431,000 -41,238,000 -1,815,000 -2,105,000 -1,450,000 -30,436,000 -11,761,000 -1,654,000 -1,183,000 -29,265,000 -10,763,000 -1,632,000 -1,187,000 -23,696,000 -7,488,000 -1,349,000 -820,000 -20,182,000 -11,069,000 -1,322,000 -229,000 -10,650,000 -1,613,000 -35,203,000 -1,894,000 -18,684,000 -917,000 -593,000 -1,332,000                          
          earnings of equity-method investments
        -746,000 -714,000 -2,184,000 -1,307,000 -717,000 -659,000 -1,978,000 -1,277,000 -625,000 -3,039,000 -4,195,000 -2,738,000 -2,454,000 -2,817,000 -4,098,000 -2,288,000 -2,308,000 -2,739,000 -4,066,000 -2,313,000 -2,317,000 -2,550,000 -3,960,000 -2,687,000 -2,316,000 -2,825,000 -4,166,000 -2,998,000 -2,381,000  -6,666,000 -1,537,000 -4,015,000                                                       
          distributions from equity-method investments
        900,000 4,975,000 3,300,000 -2,250,000 3,200,000 3,900,000   6,250,000 1,700,000   400,000 3,623,000 3,698,000 1,785,000 2,480,000 3,683,000 3,928,000 1,550,000 2,550,000 7,177,000   2,000,000 2,800,000 7,200,000 4,100,000 7,700,000  10,450,000 3,300,000 8,000,000                                                       
          allowance for equity funds used during construction
        -19,604,000 -17,312,000 -15,569,000 -15,167,000 -14,441,000 -13,628,000 -15,179,000 -13,279,000 -11,152,000 -11,096,000 -11,044,000 -11,173,000 -9,908,000 -9,413,000 -9,462,000 -9,287,000 -9,123,000 -8,060,000 -7,913,000 -7,795,000 -7,769,000 -7,760,000 -7,370,000 -7,149,000 -7,272,000 -7,255,000 -6,803,000 -6,698,000 -6,356,000 -6,288,000 -6,047,000 -5,985,000 -6,033,000 -4,229,000 -5,712,000 -5,611,000 -5,232,000 -5,878,000 -5,930,000 -5,238,000 -4,985,000 -5,566,000 -5,654,000 -5,378,000 -5,187,000 -4,749,000 -4,644,000 -4,459,000 -4,079,000 -3,982,000 -3,733,000 -3,528,000 -3,615,000 -3,444,000 -3,540,000 -7,833,000 -7,616,000 -7,220,000 -6,570,000                             
          other non-cash adjustments to net income
        2,135,000 2,013,000 1,296,000 1,459,000 3,779,000 5,814,000 1,733,000 226,000 2,670,000 2,299,000 2,565,000 1,058,000 2,492,000 5,828,000 3,111,000 1,870,000 4,083,000  1,503,000 1,190,000 3,238,000  1,954,000 2,499,000 3,490,000 2,540,000 1,862,000 1,010,000 2,913,000 2,286,000 1,681,000 2,498,000 2,687,000 3,234,000 1,479,000 820,000 2,921,000 1,232,000 1,780,000 173,000 1,923,000 1,344,000 1,013,000 925,000 -494,000 668,000 3,247,000 399,000 771,000 989,000 1,110,000 779,000 419,000 3,873,000 -756,000 1,975,000 827,000 756,000 1,811,000 1,196,000 724,000 957,000 -3,148,000 3,842,000 243,000 1,022,000 721,000 27,000 1,115,000 2,049,000 2,515,000 -1,101,000                
          change in:
                                                                                               
          accounts receivable and unbilled receivables
        22,302,000 40,458,000                                                                                      
          prepayments
        5,033,000 -10,000 -12,084,000 4,361,000 4,067,000 -1,000,000 -5,307,000 -4,420,000 1,796,000 -551,000 93,000 -7,125,000 4,363,000                                                                           
          materials, supplies, and fuel stock
        -1,979,000 10,611,000 12,562,000 -3,489,000 -1,314,000 -25,156,000 -19,543,000 -19,755,000 -19,807,000 -7,900,000 -14,853,000 -16,959,000 -13,531,000                                                                           
          accounts and wages payable
        -62,735,000 17,451,000 13,777,000 18,497,000 -65,893,000 49,983,000 10,622,000 18,535,000 -62,201,000 35,173,000 22,052,000 -26,001,000 -112,468,000                                                                           
          taxes accrued/receivable
        24,807,000 -46,754,000 15,060,000 11,711,000 25,797,000 -45,232,000 18,962,000 17,394,000 19,645,000 -53,725,000 5,365,000 12,841,000 22,968,000 -30,756,000 -5,125,000 14,876,000 16,377,000 -59,184,000 15,571,000 8,572,000 17,156,000 -35,565,000 24,336,000 7,247,000 12,932,000 -44,858,000 22,070,000 6,773,000 16,757,000 -40,144,000 21,919,000 7,724,000 15,226,000 -50,326,000 36,614,000 9,809,000 8,264,000 -7,828,000 5,870,000 -2,605,000 5,225,000 -19,027,000 1,977,000 5,687,000 12,181,000 -27,697,000 -1,495,000 -10,250,000 25,811,000 -19,874,000 10,975,000 5,806,000 7,840,000 -12,061,000 2,668,000 -1,563,000 10,352,000 -16,359,000 -7,071,000 15,878,000 22,665,000 20,583,000                          
          other assets and liabilities
        -27,232,000 48,924,000 -19,072,000 20,375,000 -12,662,000 16,625,000 -15,695,000 19,120,000 12,088,000 25,655,000 -12,987,000 13,315,000 -15,271,000                                                                           
          net cash from operating activities
        75,814,000 137,773,000 162,837,000 176,941,000 124,287,000 136,435,000 201,935,000 146,362,000 109,685,000 104,996,000 155,252,000 97,178,000 -90,399,000 82,310,000 113,020,000 62,956,000 92,999,000 59,857,000 136,212,000 83,533,000 83,662,000 104,101,000 155,417,000 94,817,000 33,796,000 79,610,000 120,942,000 109,074,000 56,999,000 125,683,000 169,519,000 104,686,000 91,738,000 89,196,000 157,180,000 77,948,000 113,696,000 72,289,000 137,528,000 71,713,000 66,176,000 62,374,000 119,845,000 65,530,000 105,445,000 48,516,000 152,520,000 66,369,000 96,938,000 57,903,000 133,437,000 60,230,000 53,979,000 67,787,000 98,445,000 45,387,000 37,650,000 75,333,000 78,016,000 63,675,000 93,219,000 82,871,000 100,450,000 61,899,000 44,353,000 61,906,000 32,582,000 20,917,000 5,737,000 20,442,000 21,021,000 -70,000                
          capital expenditures
        -172,488,000 -343,180,000 -247,813,000 -338,815,000 -27,179,000 -161,435,000 -175,013,000 -356,704,000 -148,020,000 -125,602,000 -163,685,000 -103,933,000 -32,517,000 -108,368,000 -115,866,000 -73,633,000 -50,398,000 -89,570,000 -59,458,000 -47,898,000 -49,383,000 -87,230,000 -55,660,000 -72,321,000 -50,723,000 -64,233,000 -72,497,000 -65,520,000 -37,640,000 -73,065,000 -62,312,000 -66,052,000 -46,896,000 -68,430,000 -58,907,000 -71,443,000 -53,488,000 -83,964,000 -80,923,000 -60,794,000 -36,666,000 -46,897,000 -92,200,000 -68,147,000 -62,937,000 -64,103,000 -74,622,000 -67,585,000 -39,346,000 -67,994,000 -46,359,000 -62,381,000 -34,330,000 -47,723,000 -67,022,000 -70,993,000 -27,141,000 -67,158,000 -90,914,000 -76,123,000 -77,239,000 -76,417,000 -51,147,000 -97,261,000 -44,617,000 -50,535,000 -78,900,000 -36,513,000 -84,392,000 -72,578,000 -49,601,000 -56,863,000                
          free cash flows
        -96,674,000 -205,407,000 -84,976,000 -161,874,000 97,108,000 -25,000,000 26,922,000 -210,342,000 -38,335,000 -20,606,000 -8,433,000 -6,755,000 -122,916,000 -26,058,000 -2,846,000 -10,677,000 42,601,000 -29,713,000 76,754,000 35,635,000 34,279,000 16,871,000 99,757,000 22,496,000 -16,927,000 15,377,000 48,445,000 43,554,000 19,359,000 52,618,000 107,207,000 38,634,000 44,842,000 20,766,000 98,273,000 6,505,000 60,208,000 -11,675,000 56,605,000 10,919,000 29,510,000 15,477,000 27,645,000 -2,617,000 42,508,000 -15,587,000 77,898,000 -1,216,000 57,592,000 -10,091,000 87,078,000 -2,151,000 19,649,000 20,064,000 31,423,000 -25,606,000 10,509,000 8,175,000 -12,898,000 -12,448,000 15,980,000 6,454,000 49,303,000 -35,362,000 -264,000 11,371,000 -46,318,000 -15,596,000 -78,655,000 -52,136,000 -28,580,000 -56,933,000                
          investing activities:
                                                                                               
          additions to property, plant, and equipment
        -371,527,000                                                                                       
          payments received from transmission project joint funding partners
        47,364,000 59,914,000 29,944,000 44,623,000 17,399,000 24,958,000 18,838,000 19,537,000 20,375,000 11,581,000 5,967,000 5,830,000 3,123,000 6,799,000 5,448,000 4,232,000 1,299,000 2,347,000 1,276,000 1,157,000 1,096,000 746,000 723,000 1,335,000 393,000 733,000 693,000 321,000 695,000 541,000 723,000 553,000 19,770,000 140,000 147,000 5,086,000 701,000 733,000 1,552,000                                                 
          proceeds from the sale of renewable energy certificates
        32,138,000                                                                                       
          other
        -4,370,000 13,781,000 3,714,000 -1,969,000 880,000 5,765,000 1,232,000 2,633,000 4,940,000 1,102,000 -3,387,000 -415,000 4,853,000 -1,107,000 -785,000 4,718,000 2,049,000 -7,401,000 8,091,000 550,000 797,000 2,546,000 -79,000 1,115,000 3,826,000 1,515,000 -19,000 176,000 -85,000 3,184,000 793,000 581,000 -86,000 2,298,000 -29,000 284,000 -72,000 1,153,000 27,000 -1,056,000 1,020,000 -82,000 326,000 -451,000 1,008,000 627,000 5,281,000 -2,782,000 1,836,000 107,000 995,000 534,000 1,837,000 477,000 999,000 -102,000 -1,034,000 861,000 746,000 663,000 1,026,000 1,092,000 2,265,000 588,000 2,385,000    -177,000 -2,140,000 -38,000                 
          net cash from investing activities
        -296,395,000 -298,143,000 -257,065,000 -290,651,000 -183,045,000 -161,247,000 -197,997,000 -323,754,000 -234,663,000 -178,066,000 -148,082,000 -154,643,000 -109,156,000 -133,884,000 -86,456,000 -105,640,000 -98,287,000 -106,034,000 -60,595,000 -27,675,000 -79,349,000 -105,166,000 -91,255,000 -77,163,000 -73,674,000 -87,909,000 -66,921,000 -68,930,000 -56,732,000 -87,698,000 -61,571,000 -64,215,000 -44,693,000 -84,476,000 -59,584,000 -65,187,000 -74,053,000 -99,901,000 -83,080,000 -61,242,000 -53,221,000 -58,794,000 -82,266,000 -74,055,000 -76,591,000 -79,798,000 -65,174,000 -72,161,000 -55,287,000 -76,604,000 -55,423,000 -55,875,000 -48,691,000 -58,532,000 -62,645,000 -73,663,000 -48,981,000 -72,010,000 -77,486,000 -82,858,000 -100,004,000 -97,767,000 -70,778,000 -94,909,000 -40,621,000 -49,706,000 -50,714,000 -65,101,000 -66,056,000 -71,972,000 -40,810,000 -106,857,000                
          financing activities:
                                                                                               
          issuance of long-term debt
        350,000,000 400,000,000    350,000,000 522,000,000 48,000,000 100,000,000 50,000,000          220,000,000     120,000,000 250,000,000              130,000,000 100,000,000          60,000,000           
          discount on issuance of long-term debt
        -854,000 -3,072,000    -3,234,000 -3,772,000                                                                           
          retirement of long-term debt
         -19,885,000     -125,000,000 -100,000,000                 -1,064,000 -100,000,000 -1,064,000 -120,000,000 -1,064,000 -1,064,000 -70,000,000 -1,064,000 -100,000,000 -1,064,000 -121,064,000 -1,064,000 -80,000,000 -8,735,000 -1,313,000 -4,538,000 -1,779,000 -2,328,000 -4,954,000 -2,696,000 -121,649,000 -3,092,000 -5,847,000 -2,054,000 -6,901,000 -66,669,000 -6,665,000 -2,832,000         
          payments on finance lease liabilities
        -1,415,000 -1,394,000 -1,639,000                                                                                     
          dividends on common stock
        -49,201,000 -48,482,000 -46,539,000 -46,529,000 -46,932,000 -47,413,000 -44,266,000 -42,144,000 -42,742,000 -42,967,000 -40,040,000 -40,036,000 -40,502,000 -39,979,000 -37,969,000 -37,968,000 -38,371,000 -37,929,000 -35,905,000 -35,906,000 -36,379,000 -35,814,000 -33,839,000 -33,848,000 -34,312,000 -33,806,000 -31,794,000 -31,787,000 -32,290,000 -31,747,000 -29,733,000 -29,732,000 -30,209,000 -29,686,000 -27,678,000 -27,676,000 -28,087,000 -27,634,000 -25,631,000 -25,632,000 -26,087,000 -25,585,000 -23,898,000 -23,273,000 -24,054,000 -23,531,000 -21,539,000 -21,540,000 -21,879,000 -21,509,000 -19,010,000 -19,010,000 -19,303,000 -18,978,000 -16,480,000 -16,670,000 -16,800,000 -14,860,000 -14,846,000 -14,815,000 -15,147,000 -14,659,000 -14,475,000 -14,406,000 -14,353,000 -13,531,000 -13,510,000 -13,475,000 -13,343,000 -13,155,000 -13,131,000 -12,823,000 -12,928,000 -12,755,000 -12,766,000 -12,689,000 -12,675,000 -12,661,000 -12,665,000 -11,301,000 -11,457,000 -11,466,000 -11,466,000 -17,773,000 -17,781,000 -17,706,000 -17,178,000 
          issuance of common stock
        52,930,000 93,236,000 1,487,000 1,504,000 1,550,000 63,778,000 1,494,000 231,566,000 1,612,000                                     35,000 160,000 255,000 43,000 2,352,000 2,487,000 7,093,000 2,154,000 6,039,000 2,215,000 10,558,000 3,130,000 7,590,000 2,469,000 8,255,000 2,082,000 2,213,000 22,442,000 10,217,000 2,234,000 32,291,000 4,358,000 2,023,000 2,793,000 2,635,000 2,187,000           
          tax withholdings on net settlements of share-based awards
        -6,098,000 -33,000 -9,000 1,000 -3,295,000 -88,000 -3,694,000 -19,000 -3,255,000 -153,000 -2,958,000 -5,000 -3,026,000 -11,000 -447,000 -4,183,000                                                               
          net cash from financing activities
        342,628,000 42,879,000 -47,051,000 -46,297,000 324,388,000 -34,273,000 254,453,000 189,368,000 -44,868,000 -44,990,000 303,540,000 -165,579,000 379,801,000 2,922,000 -38,221,000 62,020,000 8,595,000 -38,252,000 -35,910,000 -35,900,000 -39,422,000 -35,837,000 -212,509,000 303,840,000 -38,505,000 -35,018,000 -33,114,000 -31,822,000 -36,417,000 -31,743,000 -29,839,000 -164,607,000 183,583,000 -32,482,000 -25,814,000 -27,142,000 -54,113,000 -11,704,000 -44,210,000 -139,596,000 91,926,000 -10,038,000 -47,298,000 -177,736,000 231,578,000 -22,948,000 -26,929,000 -31,852,000 -31,548,000 -90,007,000 -27,299,000 107,340,000 -7,355,000 -2,962,000 -29,940,000 33,793,000 -7,625,000 -6,824,000 -27,532,000 -16,442,000 -127,951,000 58,260,000 -41,223,000 57,128,000 76,553,000 36,602,000 19,652,000 43,622,000 64,507,000 60,433,000 13,458,000 108,453,000                
          net increase in cash and cash equivalents
        122,047,000 -117,491,000 -141,279,000 -160,007,000 265,630,000 -59,085,000   -169,846,000 -118,060,000 310,710,000 -223,044,000 180,246,000 -48,652,000 -11,657,000 19,336,000 3,307,000 -84,429,000 39,707,000   -36,902,000 -148,347,000   -43,317,000 20,907,000 8,322,000 -36,150,000 6,242,000 78,109,000 -124,136,000 230,628,000 -27,762,000   -14,470,000 -39,316,000 10,238,000 -129,125,000 104,881,000 -6,458,000 -9,719,000 -186,261,000 260,432,000 -54,230,000 60,417,000 -37,644,000 10,103,000 -108,708,000 50,715,000       -3,501,000    43,364,000 -11,551,000 24,118,000 80,285,000 48,802,000   4,188,000 8,903,000 -6,331,000   -7,017,000 8,532,000    37,981,000   4,478,000 48,965,000    -26,952,000 
          cash and cash equivalents at beginning of the period
        215,718,000  368,865,000  327,429,000  177,577,000  215,243,000  275,116,000  217,254,000  267,492,000  76,649,000  61,480,000  114,802,000  56,808,000  78,162,000  26,527,000  27,813,000  228,677,000  52,987,000  8,828,000 7,966,000                    
          cash and cash equivalents at end of the period
        337,765,000  -141,279,000 -160,007,000 634,495,000  258,391,000 11,976,000 157,583,000  310,710,000 -223,044,000 357,823,000  -11,657,000 19,336,000 218,550,000  39,707,000 19,958,000 240,007,000  -148,347,000 321,494,000 138,871,000  20,907,000 8,322,000 231,342,000  78,109,000 -124,136,000 307,277,000  71,782,000 -14,381,000 47,010,000  10,238,000 -129,125,000 219,683,000  -9,719,000 -186,261,000 317,240,000  60,417,000 -37,644,000 88,265,000  50,715,000 111,695,000 24,460,000  5,860,000 5,517,000 8,857,000  -27,002,000 -35,625,000 93,941,000  41,436,000  89,113,000 48,802,000 1,520,000 7,404,000                    
          supplemental disclosure of cash flow information:
                                                                                               
          cash paid for interest
        51,961,000 24,139,000 53,724,000 21,334,000 40,080,000 20,676,000                                                                                  
          non-cash investing and financing activities:
                                                                                               
          additions to property, plant, and equipment in accounts payable
        199,039,000                                                                                       
          additions to property, plant and equipment
         -353,975,000 -290,723,000 -333,305,000 -201,324,000 -185,310,000 -218,067,000 -345,924,000 -259,978,000 -183,926,000 -153,044,000 -155,792,000 -118,375,000 -127,318,000 -111,177,000 -91,559,000 -102,535,000 -103,058,000 -68,676,000 -50,972,000 -77,293,000 -97,538,000 -68,284,000 -71,550,000 -73,566,000 -79,834,000 -69,011,000 -68,530,000 -61,330,000 -79,878,000 -64,377,000 -66,572,000 -67,026,000 -78,148,000 -60,999,000 -72,437,000 -73,904,000 -96,984,000 -82,806,000 -62,501,000 -54,659,000 -58,131,000 -82,917,000 -74,542,000 -78,431,000 -73,166,000 -72,602,000 -69,134,000 -59,192,000 -69,760,000 -56,491,000 -57,083,000 -51,976,000 -52,010,000 -64,660,000 -74,709,000 -48,382,000 -70,774,000 -80,948,000 -84,163,000 -101,880,000 -88,815,000 -69,029,000 -96,346,000 -49,592,000 -51,102,000 -72,510,000 -52,863,000 -80,888,000 -72,578,000 -49,601,000 -56,863,000 -65,720,000 -53,498,000 -48,967,000 -60,097,000 -42,783,000 -49,709,000 -40,725,000 -55,140,000 -51,908,000 -38,013,000 -51,582,000 -39,968,000 -32,631,000 -24,968,000 -45,223,000 
          investments in affordable housing and other real estate tax credit projects
                                                                                               
          purchase of equity securities
                                -3,230,000 -10,214,000 -212,000 -230,000 -240,000  -944,000 -133,000 -95,000                                                       
          purchases of held-to-maturity securities
                 -749,000 -135,000 -432,000 -301,000 -207,000 -1,325,000 -29,692,000                                                                       
          proceeds from sale of investment securities
                                                                                               
          debt issuance costs and other
                     -739,000 -99,000 -12,000 -76,000 -323,000 6,000 -17,000 -23,000 -354,000 -3,249,000 -10,000 -1,172,000 -1,307,000 -35,000 -20,000                                                           
          cash and cash equivalents at beginning of the year
                                                                                               
          cash and cash equivalents at end of the year
                                                                                               
          non-cash investing activities:
                                                                                               
          additions to property, plant and equipment in accounts payable
         10,795,000 42,910,000 -5,510,000 174,145,000 23,875,000 43,054,000 -10,780,000 111,958,000 58,324,000 -10,641,000 51,859,000 85,858,000 18,950,000 -4,689,000 17,926,000 52,137,000 13,488,000 9,218,000 3,074,000 27,910,000 10,308,000 12,624,000 -771,000 22,843,000 15,601,000 -3,486,000 3,010,000 23,690,000 6,813,000 2,065,000 520,000 20,130,000 9,718,000 2,092,000 994,000 20,416,000 13,020,000 1,883,000 1,707,000 17,993,000 11,234,000 -9,283,000 6,395,000 15,494,000 9,063,000 -2,020,000 1,549,000 19,846,000 1,766,000 10,132,000 -5,298,000 17,646,000 4,287,000 -2,362,000 3,716,000 21,241,000 3,616,000 -9,966,000 8,040,000 24,641,000 12,398,000 17,882,000 -915,000 4,975,000 567,000 -6,390,000 16,350,000 -3,504,000                   
          right-of-use asset obtained in exchange for finance lease liability
                                                                                             
          cash paid for income taxes
          5,310,000   16,370,000                                                                                  
          accounts receivable and unbilled revenues
           -34,487,000 5,870,000 30,776,000 24,869,000 -57,462,000 33,251,000 -6,937,000 17,848,000 -17,789,000 -10,750,000                                                                           
          distributions from equity-method investments, return of investment
                     -2,798,000 952,000 7,415,000 2,920,000                                                                       
          purchases of short-term investments
                       -25,000,000                                                                  
          maturities of short-term investments
                        25,000,000 25,000,000                                                                   
          net decrease in cash and cash equivalents
                            -35,109,000    -78,383,000                            -2,067,000  5,860,000 5,517,000 -18,956,000   -35,625,000 -134,736,000       -562,000         1,407,000   3,715,000     -21,409,000 -1,202,000  
          cash paid during the period for:
                                                                                               
          income taxes
                 4,300,000    7,665,000 31,955,000   22,009,000 9,441,000   7,540,000 2,110,000   8,830,000        13,040,000 500,000 1,200,000 2,000 1,115,000 1,625,000 560,000 2,000 4,415,000 4,158,000 282,000 2,000 6,678,000 4,666,000 20,000 1,377,000   273,000 7,000 973,000 198,000 -862,000 1,153,000 4,000 -12,700,000 -27,948,000 -1,367,000   8,757,000   501,000 3,293,000 21,000 11,500,000                
          interest
               18,140,000 37,770,000 15,128,000 38,687,000 16,651,000 27,276,000 17,928,000 26,400,000 16,351,000 25,306,000 16,326,000 25,547,000 16,320,000 25,306,000 16,444,000 26,327,000 18,416,000 19,887,000 19,425,000 23,631,000 19,315,000 22,889,000 19,119,000 22,338,000 18,674,000 20,820,000 19,747,000 20,776,000 18,743,000 20,738,000 18,110,000 20,231,000 21,821,000 18,172,000 21,812,000 17,549,000 23,168,000 16,913,000 21,552,000 17,004,000 21,516,000 17,223,000 23,061,000 17,297,000 20,596,000 17,014,000 20,750,000 16,941,000 18,253,000 14,943,000 18,464,000 15,657,000 18,418,000 18,430,000 21,693,000 13,021,000 25,812,000 9,535,000 7,109,000 25,890,000 7,934,000 6,738,000 21,831,000 7,511,000 24,833,000                
          proceeds from sale of equity securities
                                                                                               
          cash paid during the year for:
                                                                                               
          investments in affordable housing and other real estate tax credits projects
                  -2,877,000 135,000  -7,518,000 -37,000 -2,628,000                                                                       
          purchases of equity securities
                  -1,357,000 -1,171,000 -755,000  -946,000 -6,954,000 -20,988,000  -130,000 -221,000 -171,000  -75,000                                                                 
          proceeds from the sale of equity securities
                  1,851,000 2,237,000 2,164,000  3,895,000 1,545,000 51,288,000  1,556,000 1,640,000 1,557,000  1,385,000 1,791,000 839,000  1,281,000 1,233,000 1,313,000  1,322,000 1,226,000 1,224,000                                                       
          investments in unconsolidated affiliates
                                                                   -800,000 -300,000  -2,200,000   5,660,000 -3,725,000 -5,000,000 -1,325,000 -3,250,000 -350,000 -660,000 -3,850,000 -3,700,000 -7,820,000             
          premium on issuance of long-term debt
                                                                                             
          make-whole premium on retirement of long-term debt
                                                                                        
          receivables
                      -49,281,000 -8,788,000 -4,257,000  -26,201,000 -11,790,000 -3,451,000                                                                   
          accounts payable and other accrued liabilities
                      42,946,000 21,550,000 -44,989,000 17,296,000 -2,216,000 44,839,000 -42,219,000 19,591,000 10,061,000 19,381,000 -49,389,000 22,119,000 12,641,000 447,000 -44,733,000 36,163,000 6,513,000 12,646,000 -25,656,000 15,286,000 -1,817,000 18,258,000 -48,935,000 23,333,000 4,678,000 28,594,000 -43,305,000 14,650,000 661,000 21,871,000 -34,742,000 9,718,000 10,304,000 13,434,000 -27,097,000 3,988,000 7,699,000 20,315,000 -32,519,000 12,020,000 5,319,000 16,456,000 -23,215,000 7,637,000 11,634,000 13,067,000 -26,910,000 9,800,000 -29,144,000 -3,402,000 -41,655,000 -3,320,000 16,407,000 -29,869,000 -16,433,000 42,584,000 -46,132,000 20,977,000                
          other current assets
                      28,275,000 -31,565,000 14,521,000 -9,600,000 49,479,000 -67,609,000 19,403,000 -4,028,000 32,827,000 -25,157,000 1,268,000 -12,438,000 20,072,000 -25,566,000 9,112,000 91,000 28,768,000 -22,461,000 6,309,000 -15,922,000 35,687,000 -46,903,000 29,952,000 -18,230,000 42,307,000 -45,746,000 10,782,000 -14,683,000 28,429,000 -37,262,000 8,655,000 -15,213,000 19,032,000 -38,629,000 21,686,000 -16,914,000 34,810,000 -51,638,000 21,577,000 6,165,000 16,765,000 -25,765,000 -1,242,000 4,872,000 -2,191,000 -22,419,000 54,000 934,000 12,385,000 -2,236,000 8,436,000 7,981,000 -26,650,000 729,000 5,717,000 -20,271,000 4,869,000 -6,070,000                
          other current liabilities
                      -14,136,000 -6,012,000 13,894,000 3,369,000 -5,925,000 3,233,000 2,425,000 2,868,000 -7,948,000 7,954,000 5,122,000 3,142,000 -13,291,000 5,613,000 3,737,000 5,229,000 -7,435,000 3,898,000 5,156,000 4,027,000 -9,958,000 501,000 6,447,000 2,168,000 -10,268,000 -9,112,000 13,929,000 -7,471,000 40,000 -8,164,000 15,998,000 -5,487,000 -452,000 179,000 7,531,000 -3,434,000 -1,299,000 1,559,000 4,993,000 -1,999,000 -2,732,000 -8,581,000 4,812,000 796,000 -10,901,000 3,836,000 8,440,000 -7,909,000 13,733,000 -13,335,000 11,952,000 5,316,000 -8,572,000 12,227,000 5,422,000 -6,005,000 17,165,000 -18,244,000                
          other assets
                      -3,418,000 -3,918,000 -3,672,000 -3,662,000 -3,817,000 -1,051,000 -2,234,000 -2,778,000 -1,348,000 505,000 -1,925,000 -898,000 -1,995,000 -525,000 -957,000 -1,984,000 -65,000 -3,506,000 -1,933,000 -3,478,000 -1,665,000 -1,649,000 -2,043,000 -2,620,000 1,057,000 139,000 -2,473,000 553,000 -455,000 3,129,000 -206,000 -685,000 -4,143,000 -575,000 1,748,000 423,000 -671,000 507,000 -1,089,000 138,000 -4,860,000 -2,647,000 305,000 -265,000 4,049,000 655,000 -109,000 -219,000 -1,782,000 943,000 -1,332,000 667,000 1,581,000 -1,122,000 190,000 1,956,000 -1,388,000 2,445,000 32,000 -315,000 1,172,000 1,834,000 704,000 -311,000 2,000 1,426,000 -1,604,000 424,000      
          other liabilities
                      1,575,000 1,845,000 2,690,000 60,000 1,393,000 3,000 1,902,000 2,603,000 -434,000 144,000 -279,000 -66,000 -418,000 400,000 639,000 -305,000 222,000 -977,000 -495,000 -599,000 -64,000 309,000 -739,000 -1,601,000 2,053,000 -8,000 -1,450,000 -2,996,000 2,342,000 -8,083,000 6,370,000 -1,106,000 612,000 -1,738,000 -4,475,000 -56,000 -2,294,000 -801,000 -5,716,000 568,000 -2,200,000 -1,454,000 -4,326,000 -1,918,000 134,000 1,400,000 -4,992,000 547,000 -4,712,000 -5,515,000 -14,859,000 -55,000 578,000 -2,711,000 -2,327,000 5,845,000 2,455,000 3,412,000 6,924,000 109,000 -246,000 -292,000    355,000 -2,043,000 136,000      
          other adjustments to net income
                                                                                               
          accounts receivable
                             30,841,000 -22,272,000 -14,045,000 5,102,000 18,802,000 -15,465,000 15,902,000 -25,235,000 13,705,000 -7,039,000 -1,015,000 -4,922,000 24,525,000 -17,762,000 -3,252,000 494,000 9,764,000 -12,839,000 -4,324,000 4,728,000 19,444,000 -13,922,000 -7,576,000 6,794,000 16,061,000 -1,886,000 9,100,000 -2,842,000 8,996,000 -40,019,000 16,624,000 -15,158,000                                   
          investments in affordable housing and other tax credits
                          -2,712,000                                                                     
          investments in affordable housing
                            -5,335,000 -2,719,000 -2,225,000 -7,458,000 -1,936,000                            -32,000 206,000 37,000 -350,000 -603,000 -50,000 -905,000 -4,053,000 -2,480,000 374,000 -850,000 1,000 -8,487,000 300,000      272,000           
          gain on sale of investments and assets
                                                                                               
          net change in short-term borrowings
                                         -2,425,000 1,875,000 550,000 -21,800,000 16,400,000 -18,500,000 600,000 3,300,000 16,400,000 -23,400,000 -16,400,000 12,100,000 -500,000 -5,400,000 -10,100,000 -7,450,000 1,750,000 -8,900,000 -21,850,000 14,050,000 18,300,000 -13,300,000 1,700,000 8,800,000 2,700,000 -14,900,000 -7,700,000 7,200,000 62,900,000 -27,650,000 16,970,000 -550,000 -75,506,000 32,013,000 57,063,000 57,913,000                   
          acquisition of treasury stock
                                 -40,000 -13,000 -4,107,000 -63,000 6,000 -3,557,000 -23,000 -15,000 -12,000 -3,162,000 -42,000 -12,000 -191,000 -3,084,000 -55,000 -3,222,000 -273,000 -2,464,000 -3,000 -2,121,000 -2,062,000 -29,000 -1,904,000 -23,000 -829,000 -1,408,000 -23,000 -12,000 -269,000 -8,000 -338,000                
          proceeds from the sale of emission allowances and renewable energy certificates
                                  347,000 787,000 2,915,000  912,000 130,000 1,520,000  53,000 966,000 873,000                                                   
          earnings of unconsolidated equity-method investments
                                         -4,105,000 -5,232,000   779,000 -12,325,000   -2,492,000 -5,526,000   -3,464,000 -6,415,000 -1,510,000 -983,000 -11,368,000   -107,000                                   
          distributions from unconsolidated equity-method investments
                                         6,625,000 10,250,000 -2,500,000 10,600,000 8,527,000   2,814,000 3,106,000 3,629,000 3,519,000 2,204,000 -559,000   594,000 3,308,000 6,229,000 358,000 7,631,000 6,171,000 8,175,000 -4,850,000 9,050,000 125,000    5,250,000                          
          purchase of available-for-sale securities
                                         -8,108,000 -83,000 -394,000 -2,771,000 -5,074,000 -8,634,000                              -24,349,000 -3,621,000 -4,930,000 -5,102,000 -4,326,000 -3,641,000 -3,919,000 -3,168,000 -74,606,000         
          proceeds from sale of available-for-sale securities
                                                                                               
          purchase of life insurance investment
                                                                                              
          proceeds from the sale of available-for-sale securities
                                          1,327,000 1,308,000 1,120,000  12,272,000                              814,000                   
          (earnings) losses of unconsolidated equity-method investments
                                            -1,445,000                                                   
          proceeds from the sale of emission allowances and recs
                                               428,000 418,000  319,000 754,000 782,000 8,000 308,000 1,341,000 1,274,000 18,000   33,000 810,000 1,111,000 785,000 1,151,000 1,666,000 1,442,000 2,055,000 1,009,000                          
          distributions from affordable housing investments
                                                  6,000 184,000 50,000 113,000 200,000 53,000 795,000 49,000 55,000 194,000 1,448,000                                   
          losses of unconsolidated equity-method investments
                                                42,000               1,928,000 -1,419,000  -2,084,000 4,447,000 1,294,000                           
          losses (earnings) of unconsolidated equity-method investments
                                                    160,000                  2,378,000                         
          proceeds from the sale of utility assets
                                                                                              
          cash paid (received) during the year for:
                                                                                               
          accounts receivable and prepayments
                                                             12,180,000 -16,701,000 237,000 365,000 9,889,000 -11,167,000 3,820,000 -4,774,000 4,591,000 4,629,000 6,316,000 -8,119,000 -13,786,000 156,000 1,811,000 -6,702,000 -3,603,000 602,000 735,000                
          cash paid (received) during the period for:
                                                                                               
          proceeds from the sale of non-utility assets
                                                                       250,000 63,000                      
          maturity of held-to-maturity securities
                                                                         1,875,000 955,000 1,780,000 1,537,000 1,200,000 530,000 3,666,000 791,000 190,000 51,000 1,236,000 400,000 1,153,000         
          remarketing of pollution control bonds
                                                                                               
          decrease in term loans
                                                                                               
          cash (received) paid during the year for:
                                                                                               
          allowance for other funds used during construction
                                                                    -5,329,000 -4,673,000                          
          adjustments to reconcile net income to net cash provided by
                                                                                               
          purchase of available for sale securities
                                                                                               
          purchase of held-to-maturity securities
                                                                         -1,920,000   -1,791,000 -925,000 -400,000 -1,485,000 -1,092,000 -153,000 -812,000 -422,000 -160,000 -787,000         
          withdrawal of refundable deposit for tax related liabilities
                                                                                               
          remarketing (purchase) of pollution control revenue bonds
                                                                                              
          non-cash investing activities
                                                                                               
          the accompanying notes are an integral part of these statements.
                                                                                               
          remarketing of pollution control revenue bonds
                                                                                               
          non-cash pension expense
                                                                      1,235,000 949,000 697,000 1,735,000 1,181,000 93,000                    
          gain on sale of assets
                                                                      -40,000 -9,000 -382,000 13,000   -1,750,000 -1,083,000 -1,604,000 -416,000                
          taxes accrued
                                                                      29,706,000  8,553,000 11,499,000 588,000 -5,843,000 -2,497,000 -13,175,000 593,000 -26,819,000                
          sales of emission allowances and renewable energy certificates
                                                                      666,000                         
          cash (received) paid during the period for:
                                                                                               
          losses of equity method investments
                                                                                               
          distributions from equity method investments
                                                                       3,062,000                        
          taxes receivable
                                                                                               
          proceeds from the sale idacomm
                                                                                               
          proceeds from the sale of emission allowances
                                                                       2,341,000 2,126,000   17,161,000                   
          increase in term loans
                                                                                             
          income taxes (refunded) paid
                                                                       -45,000                        
          adjustments to reconcile net income to net cash from
                                                                                               
          (earnings) losses of equity method investments
                                                                                               
          proceeds from the sale of investments
                                                                        4,845,000                       
          undistributed losses of subsidiaries
                                                                        12,000                       
          excess tax benefit from share-based payment arrangements
                                                                        -128,000                       
          cash received during the period for:
                                                                                               
          income taxes refunded
                                                                        13,060,000                       
          undistributed earnings of subsidiaries
                                                                            -1,726,000 -1,356,000 -1,566,000                 
          proceeds from the sale of idacomm
                                                                                              
          purchase of pollution control bonds
                                                                                               
          undistributed losses (earnings) of subsidiaries
                                                                                               
          tax deposit withdrawal
                                                                                               
          purchase of pollution control revenue bonds
                                                                                               
          undistributed (earnings) losses of subsidiaries
                                                                           931,000                    
          proceeds from the sale of iti
                                                                                               
          cash and cash equivalents at beginning of period
                                                                            9,892,000  52,356,000             
          cash and cash equivalents at end of period
                                                                            4,188,000 8,903,000 3,561,000  -45,505,000 -7,017,000 60,888,000            -27,264,000 
          sale of idacomm
                                                                              7,283,000                 
          sale of emission allowances
                                                                               458,000 944,000 9,921,000             
          sale of available-for-sale securities
                                                                              25,296,000 4,374,000 5,797,000 5,832,000 4,775,000 3,947,000 5,441,000 3,723,000 106,915,000         
          change in short-term borrowings
                                                                              27,427,000 96,310,000 -12,510,000 -14,600,000 -300,000  6,800,000 -4,900,000 17,430,000     -94,025,000    
          benefit from uncollectible accounts
                                                                               64,000                
          gain on extinguishment of debt
                                                                                               
          impairment of goodwill
                                                                                               
          impairment of long-lived asset
                                                                                               
          sale of non-utility assets
                                                                                  4,000 776,000   591,000 2,000        
          sale of iti
                                                                                              
          refundable income tax deposit
                                                                                               
          retirement of preferred stock of ipc
                                                                                               
          cash and cash equivalents at beginning of year
                                                                                               
          cash and cash equivalents at end of year
                                                                                               
          unrealized (gains) losses from energy marketing activities
                                                                                               
          investments in affordable housing projects
                                                                                              61,000 
          retirement of preferred stock of idaho power company
                                                                                       -52,143,000 -49,000 -28,000 49,000 -78,000 -242,000 -589,000  
          increase in short-term borrowings
                                                                                             -73,350,000 -239,300,000 
          acquisition of treasury shares
                                                                                       -1,000 1,000 -1,420,000 -1,000 -798,000  
          retirement of ipc preferred stock
                                                                                               
          cash and cash equivalents beginning of period
                                                                                    23,403,000 75,159,000 42,736,000 -312,000 
          cash and cash equivalents end of period
                                                                                    1,407,000 -49,478,000 61,384,000 3,715,000 -62,403,000 79,637,000  6,069,000 -21,409,000 41,534,000  
          non-cash financing activities:
                                                                                               
          issuance of first mortgage bonds
                                                                                       55,000,000 50,000,000      
          issuance of other long-term debt
                                                                                               
          retirement of first mortgage bonds
                                                                                       -50,000,000    
          retirement of other long-term debt
                                                                                       -3,828,000 -17,613,000 -1,978,000 -8,434,000 -4,440,000 -6,563,000 -766,000  
          common stock issued
                                                                                       78,000 55,000 73,000 4,123,000 2,770,000 
          proceeds from sales of assets
                                                                                               
          proceeds from issuance of first mortgage bonds
                                                                                             
          proceeds from issuance of other long-term debt
                                                                                          40,017,000 25,475,000  
          proceeds from issuance of pollution control bonds
                                                                                               
          retirement of pollution control bonds
                                                                                               
          distributions of treasury shares
                                                                                               
          investments in low-income housing projects
                                                                                               
          other - net
                                                                                           2,925,000 585,000 -7,289,000  
          (used in) operating activities:
                                                                                               
          distribution of treasury shares for acquisition
                                                                                               
          retirement of:
                                                                                               
          supplemental disclosure of cash flow
                                                                                               
          information:
                                                                                               
          distribution of treasury stock to affiliates