7Baggers

Avista Corporation
(NYSE:AVA) 

AVA stock logo

Avista Corporation operates as an electric and natural gas utility company. It operates in two segments, Avista Utilities and AEL&P. The Avista Utilities segment provides electric distribution and transmission, and natural gas distribution services in parts of eastern Washington and northern Idaho; ...

Founded: 1889
Full Time Employees: 1,920
Sector: Utilities
Industry: Utilities-Diversified

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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 2010-09-30 2010-06-30 2010-03-31 2009-12-31 2009-09-30 2009-06-30 2009-03-31 2008-12-31 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 
                                                                                     
      operating revenues:
                                                                                     
      utility revenues, exclusive of alternative revenue programs
    547,000,000 505,000,000 411,000,000 399,000,000 625,000,000 520,041,000 389,587,000 385,861,000 606,511,000 502,323,000 375,946,000 374,285,000 493,543,000 514,817,000 365,142,000 384,214,000 478,703,000 425,244,000 306,398,000 301,176,000 412,182,000 379,945,000 276,351,000 273,975,000 393,820,000 364,774,000 276,683,000 288,826,000 393,241,000 362,654,000 288,513,000 309,134,000 408,356,000                                                 
      alternative revenue programs
    23,000,000 27,000,000 -8,000,000 12,000,000 -8,000,000 11,968,000 3,978,000 16,171,000 2,883,000 14,846,000 3,578,000 5,513,000 -19,038,000 -4,937,000 -5,850,000 -5,793,000 -16,777,000 6,434,000 -10,499,000 -3,069,000 499,000 209,000 -3,972,000 4,362,000 -4,413,000 -1,491,000 6,038,000 9,725,000 -4,658,000 2,671,000 606,000 3,570,000 -5,939,000                                                 
      total operating revenues
    570,000,000 533,000,000 403,000,000 411,000,000 617,000,000 532,770,000 393,742,000 402,072,000 609,416,000 517,360,000 379,626,000 379,937,000 474,631,000 510,149,000 359,446,000 378,566,000 462,046,000 431,804,000 296,007,000 298,255,000 412,870,000 380,423,000 272,646,000 278,592,000 390,230,000 364,559,000 283,770,000 300,812,000 396,481,000 372,221,000 296,013,000 319,298,000 409,361,000 397,862,000 297,096,000 314,501,000 436,470,000 402,123,000 303,349,000 318,838,000 418,173,000  313,649,000 337,332,000 446,490,000  301,558,000 312,580,000 490,962,000  335,875,000 352,048,000 482,906,000 1,206,370,000 340,632,000 343,585,000 452,257,000 1,276,070,000 343,710,000 360,557,000 476,586,000 1,191,568,000 367,172,000 360,733,000 456,415,000 1,197,873,000 314,692,000 307,111,000 487,470,000 1,294,078,000 382,685,000 350,310,000 496,307,000 1,150,095,000 267,662,000 304,005,000 459,187,000  293,001,000 287,394,000 499,202,000 
      yoy
    -7.62% 0.04% 2.35% 2.22% 1.24% 2.98% 3.72% 5.83% 28.40% 1.41% 5.61% 0.36% 2.72% 18.14% 21.43% 26.93% 11.91% 13.51% 8.57% 7.06% 5.80% 4.35% -3.92% -7.39% -1.58% -2.06% -4.14% -5.79% -3.15% -6.44% -0.36% 1.53% -6.21% -1.06% -2.06% -1.36% 4.38%  -3.28% -5.48% -6.34%  4.01% 7.92% -9.06%  -10.22% -11.21% 1.67%  -1.40% 2.46% 6.78% -5.46% -0.90% -4.71% -5.10% 7.09% -6.39% -0.05% 4.42% -0.53% 16.68% 17.46% -6.37% -7.43% -17.77% -12.33% -1.78% 12.52% 42.97% 15.23% 8.08%  -8.65% 5.78% -8.02%     
      qoq
    6.94% 32.26% -1.95% -33.39% 15.81% 35.31% -2.07% -34.02% 17.79% 36.28% -0.08% -19.95% -6.96% 41.93% -5.05% -18.07% 7.00% 45.88% -0.75% -27.76% 8.53% 39.53% -2.13% -28.61% 7.04% 28.47% -5.67% -24.13% 6.52% 25.74% -7.29% -22.00% 2.89% 33.92% -5.53% -27.94% 8.54% 32.56% -4.86% -23.75%   -7.02% -24.45%   -3.53% -36.33%   -4.59% -27.10% -59.97% 254.16% -0.86% -24.03% -64.56% 271.26% -4.67% -24.35% -60.00% 224.53% 1.78% -20.96% -61.90% 280.65% 2.47% -37.00% -62.33% 238.16% 9.24% -29.42% -56.85% 329.68% -11.95% -33.79%   1.95% -42.43%  
      operating expenses:
                                                                                     
      utility operating expenses:
                                                                                     
      resource costs
    206,000,000 190,000,000 115,000,000 130,000,000 256,000,000 218,524,000 142,033,000 144,326,000 293,117,000 219,918,000 148,282,000 141,244,000 192,928,000 243,813,000 147,784,000 157,397,000 186,868,000 169,733,000 102,133,000 90,678,000 134,579,000 122,212,000 78,785,000 67,965,000 129,547,000 115,707,000 98,324,000 88,439,000 137,347,000 132,630,000 101,519,000 105,969,000 154,618,000 147,661,000 108,568,000 102,751,000 165,586,000 161,095,000 118,737,000 109,815,000 161,719,000  138,210,000 141,116,000 209,560,000  131,588,000 128,922,000 220,497,000  131,136,000 126,511,000 229,630,000 539,326,000 153,801,000 135,992,000 211,012,000 618,655,000 171,393,000 155,776,000 248,121,000 593,962,000 201,113,000 168,184,000 259,567,000 632,077,000 167,462,000 125,651,000 289,692,000 786,862,000 245,127,000 183,075,000 318,226,000 636,939,000 144,059,000 135,520,000 269,986,000  129,246,000 122,086,000 271,605,000 
      other operating expenses
    128,000,000 127,000,000 125,000,000 124,000,000 128,000,000 113,862,000 107,298,000 109,591,000 111,249,000 103,090,000 102,469,000 103,071,000 104,978,000 104,455,000 101,701,000 104,482,000 94,527,000 98,892,000 85,625,000 94,053,000 87,555,000 88,363,000 85,551,000 86,204,000 94,496,000 93,402,000 80,112,000 87,720,000 83,978,000 81,503,000 78,395,000 81,078,000 77,298,000 84,854,000 77,784,000 81,965,000 74,484,000 86,190,000 75,160,000 78,666,000 75,779,000  74,315,000 73,112,000 73,172,000  72,509,000 67,349,000 67,337,000  69,596,000 65,784,000 65,444,000 212,331,000 64,449,000 63,601,000 63,357,000 194,747,000 60,579,000 68,700,000 59,682,000 182,560,000 59,961,000 58,334,000 55,749,000 174,575,000 55,332,000 57,489,000 57,732,000 157,414,000 49,114,000 52,520,000 51,719,000 148,652,000 50,126,000 50,191,000 49,041,000  45,864,000 48,218,000 45,727,000 
      depreciation and amortization
    67,000,000 73,000,000 73,000,000 72,000,000 71,000,000 70,358,000 67,886,000 67,829,000 67,927,000 67,133,000 66,860,000 66,148,000 65,188,000 64,150,000 63,484,000 62,806,000 62,577,000 62,906,000 57,722,000 56,066,000 55,221,000 54,225,000 53,953,000 63,908,000 51,421,000 50,920,000 50,052,000 55,479,000 48,914,000 46,458,000 46,035,000 45,651,000 44,733,000 43,685,000 42,968,000 42,643,000 41,985,000 41,404,000 40,240,000 39,678,000 39,192,000  36,303,000 35,676,000 34,300,000  33,294,000 31,180,000 30,726,000  29,823,000 29,025,000 27,935,000 83,836,000 28,255,000 27,754,000 27,318,000 79,288,000 26,341,000 26,407,000 25,852,000 75,636,000 24,918,000 24,642,000 24,330,000 70,153,000 23,630,000 23,180,000 22,923,000 65,822,000 22,023,000 21,914,000 21,442,000 64,540,000 21,551,000 21,298,000 21,090,000  20,394,000 20,111,000 20,980,000 
      taxes other than income taxes
    35,000,000 30,000,000 27,000,000 28,000,000 36,000,000 27,164,000 27,438,000 25,710,000 35,688,000 27,624,000 23,280,000 24,917,000 33,894,000 27,416,000 26,002,000 26,658,000 34,117,000 27,130,000 25,440,000 24,474,000 32,309,000 26,765,000 24,016,000 24,742,000 30,978,000 27,346,000 23,455,000 22,908,000 31,943,000 25,769,000 25,101,000 25,596,000 30,829,000 27,019,000 23,269,000 23,802,000 32,662,000 24,066,000 22,669,000 22,615,000 29,385,000  22,269,000 23,257,000 29,898,000  21,000,000 21,367,000 28,146,000  18,712,000 21,608,000 25,817,000 65,319,000 18,090,000 20,390,000 25,142,000 66,520,000 16,829,000 19,699,000 24,993,000 57,550,000 15,842,000 17,866,000 21,171,000 60,299,000 16,284,000 17,482,000 26,895,000 56,734,000 15,323,000 15,223,000 25,085,000 57,431,000 15,012,000 15,050,000 23,995,000  15,170,000 18,323,000 22,066,000 
      non-utility operating expenses
     1,000,000 3,000,000  1,000,000 1,002,000 319,000 360,000 319,000 401,000 648,000 749,000                                                                      
      total operating expenses
    436,000,000 421,000,000 343,000,000 354,000,000 492,000,000 430,910,000 344,974,000 347,816,000 508,300,000 418,166,000 341,539,000 336,129,000 398,030,000 446,561,000 340,044,000 354,283,000 379,077,000 361,433,000 271,793,000 266,503,000 310,975,000 293,340,000 244,148,000 243,666,000 308,037,000 291,252,000 253,527,000 261,044,000 329,410,000 295,037,000 259,569,000 266,019,000 315,155,000 315,878,000 266,054,000 258,404,000 321,084,000 319,590,000 263,755,000 257,247,000 312,088,000  277,737,000 279,972,000 356,915,000  268,796,000 249,849,000 397,822,000  300,606,000 294,306,000 397,844,000 1,046,299,000 310,633,000 295,286,000 373,535,000 1,075,326,000 308,832,000 305,033,000 391,761,000 999,124,000 329,428,000 298,984,000 388,591,000 1,020,969,000 290,938,000 249,029,000 421,625,000 1,134,499,000 357,353,000 293,820,000 437,246,000 1,027,402,000 251,926,000 263,787,000 420,250,000  258,910,000 244,816,000 428,264,000 
      income from operations
    134,000,000 112,000,000 60,000,000 57,000,000 125,000,000 101,860,000 48,768,000 54,256,000 101,116,000 99,194,000 38,087,000 43,808,000 76,601,000 63,588,000 19,402,000 24,283,000 82,969,000 70,371,000 24,214,000 31,752,000 101,895,000 87,083,000 28,498,000 34,926,000 82,193,000 73,307,000 30,243,000 39,768,000 67,071,000 77,184,000 36,444,000 53,279,000 94,206,000 81,984,000 31,042,000 56,097,000 115,386,000 82,533,000 39,594,000 61,591,000 106,085,000        93,140,000  35,269,000 57,742,000 85,062,000 160,071,000 29,999,000 48,299,000 78,722,000 200,744,000 34,878,000 55,524,000 84,825,000 192,444,000 37,744,000 61,749,000 67,824,000 176,904,000 23,754,000 58,082,000 65,845,000 159,579,000 25,332,000 56,490,000 59,061,000 122,693,000 15,736,000 40,218,000 38,937,000  34,091,000 42,578,000 70,938,000 
      yoy
    7.20% 9.95% 23.03% 5.06% 23.62% 2.69% 28.04% 23.85% 32.00% 55.99% 96.30% 80.41% -7.68% -9.64% -19.87% -23.52% -18.57% -19.19% -15.03% -9.09% 23.97% 18.79% -5.77% -12.18% 22.55% -5.02% -17.02% -25.36% -28.80% -5.85% 17.40% -5.02% -18.36% -0.67% -21.60% -8.92% 8.77%            9.50%  17.57% 19.55% 8.05% -20.26% -13.99% -13.01% -7.19% 4.31% -7.59% -10.08% 25.07% 8.78% 58.90% 6.31% 3.01% 10.86% -6.23% 2.82% 11.49% 30.06% 60.98% 40.46% 51.68%  -53.84% -5.54% -45.11%     
      qoq
    19.64% 86.67% 5.26% -54.40% 22.72% 108.87% -10.12% -46.34% 1.94% 160.44% -13.06% -42.81% 20.46% 227.74% -20.10% -70.73% 17.90% 190.62% -23.74% -68.84% 17.01% 205.58% -18.40% -57.51% 12.12% 142.39% -23.95% -40.71% -13.10% 111.79% -31.60% -43.44% 14.91% 164.11% -44.66% -51.38% 39.81% 108.45% -35.71% -41.94%           -38.92% -32.12% -46.86% 433.59% -37.89% -38.65% -60.78% 475.56% -37.18% -34.54% -55.92% 409.87% -38.88% -8.96% -61.66% 644.73% -59.10% -11.79% -58.74% 529.95% -55.16% -4.35% -51.86% 679.70% -60.87% 3.29%   -19.93% -39.98%  
      operating margin %
    23.51% 21.01% 14.89% 13.87% 20.26% 19.12% 12.39% 13.49% 16.59% 19.17% 10.03% 11.53% 16.14% 12.46% 5.40% 6.41% 17.96% 16.30% 8.18% 10.65% 24.68% 22.89% 10.45% 12.54% 21.06% 20.11% 10.66% 13.22% 16.92% 20.74% 12.31% 16.69% 23.01% 20.61% 10.45% 17.84% 26.44% 20.52% 13.05% 19.32% 25.37% NaN% 0% 0% 0% NaN% 0% 0% 18.97% NaN% 10.50% 16.40% 17.61% 13.27% 8.81% 14.06% 17.41% 15.73% 10.15% 15.40% 17.80% 16.15% 10.28% 17.12% 14.86% 14.77% 7.55% 18.91% 13.51% 12.33% 6.62% 16.13% 11.90% 10.67% 5.88% 13.23% 8.48% NaN% 11.64% 14.82% 14.21% 
      interest expense
    40,000,000 39,000,000 38,000,000 37,000,000 38,000,000 37,497,000 36,675,000 35,924,000 36,904,000 35,866,000 34,827,000 35,018,000 35,084,000 31,516,000 29,533,000 28,518,000 28,067,000 26,749,000 26,547,000 26,131,000 26,304,000 26,564,000 25,812,000 25,625,000 26,347,000 25,991,000 25,859,000 25,511,000 25,651,000 25,489,000 24,280,000 25,170,000 24,776,000 24,191,000 23,955,000 23,670,000 23,545,000 22,273,000 21,632,000 21,318,000 21,273,000  19,951,000 19,866,000 19,902,000  18,642,000 18,547,000 19,084,000  19,566,000 19,861,000 19,692,000 57,766,000 19,128,000 19,188,000 19,137,000 55,173,000 18,703,000 -18,272,000 -18,440,000 -56,959,000 -18,830,000 -19,113,000 -19,115,000 -49,642,000 -15,435,000 -16,160,000 -15,588,000 -55,994,000 -17,452,000 -20,750,000 -18,929,000 -59,595,000 -19,547,000 -20,234,000 -20,373,000  -22,467,000 -22,209,000 -22,145,000 
      interest expense to affiliated trusts
      1,000,000  1,000,000 1,036,000 651,000 656,000 657,000 668,000 657,000 608,000 571,000 462,000 302,000 177,000 117,000 104,000 102,000 106,000 109,000 107,000 128,000 208,000 270,000 300,000 334,000 351,000 357,000 341,000 325,000 302,000 253,000 230,000 216,000 200,000 185,000 178,000 164,000 154,000 138,000  120,000 115,000 112,000  113,000 112,000 111,000  117,000 117,000 118,000 405,000 136,000 137,000 140,000 180,000 152,000 -152,000 -151,000 -460,000 -175,000 -159,000 -146,000 -1,768,000 -189,000 -253,000 -1,358,000 -4,696,000 -1,445,000 -1,520,000 -1,696,000 -5,462,000 -1,836,000 -1,817,000 -1,810,000  -1,817,000 -1,765,000 -1,704,000 
      capitalized interest
    -2,000,000 -2,000,000 -1,000,000 -1,000,000 -2,000,000 -1,588,000 -1,306,000 -1,145,000 -961,000 -999,000 -926,000 -866,000 -842,000 -865,000 -828,000 -932,000 -1,093,000 -954,000 -1,102,000 -916,000 -1,015,000 -1,104,000 -1,009,000 -972,000 -998,000 -1,056,000 -1,089,000 -1,101,000 -928,000 -615,000 -1,217,000 -1,139,000 -968,000 -797,000 -899,000 -890,000 -724,000 -393,000 -507,000 -837,000 -914,000  -905,000 -879,000 -917,000  -1,212,000 -834,000 -661,000  -820,000 -942,000 -940,000 -1,757,000 -644,000 -596,000 -525,000 -1,985,000 -957,000 814,000 438,000 -134,000 432,000 374,000 320,000 247,000 298,000 449,000 548,000 3,642,000 970,000 909,000 841,000 2,538,000 1,326,000 1,258,000 1,116,000  840,000 645,000 525,000 
      other income-net
    -9,000,000 -5,000,000 -9,000,000  -3,000,000 -2,922,000 -5,261,000 -4,532,000 -9,285,000 -3,070,000 -7,401,000 -2,626,000 -6,429,000 -39,968,000 -3,964,000 -13,934,000 -4,851,000 -9,306,000 -10,267,000  -3,684,000    -382,000    -907,000 987,750 1,379,000 -1,907,000 4,479,000 -465,000 -1,841,000 -1,656,000 -3,101,000 -3,053,000 -1,562,000 -3,041,000 -2,422,000  -2,123,000 -1,836,000 -2,231,000  -2,608,000 -3,055,000 -2,551,000  -984,000 -2,436,000 -2,145,000 -8,834,000 3,809,000  619,000 406,500 1,626,000 -803,000 -632,000 -7,150,000 -807,000  -1,699,000         539,000 2,156,000 3,547,000 3,711,000     
      income before income taxes
    105,000,000 80,000,000 31,000,000 15,000,000 91,000,000 67,837,000 18,009,000 23,353,000 73,801,000 66,729,000 10,930,000 11,674,000 48,217,000 72,443,000 -5,641,000 10,454,000 60,729,000 53,778,000 8,934,000 16,472,000 80,181,000 64,314,000 5,735,000 9,534,000 56,956,000 54,005,000 4,959,000 23,275,000 145,898,000 54,462,000 11,677,000 30,853,000 65,666,000 34,966,250 9,611,000 34,773,000 95,481,000    88,010,000        77,157,000  17,390,000 41,142,000 68,337,000 112,491,000 7,570,000 28,892,000 59,351,000 144,817,000 15,354,000 37,111,000 66,040,000 127,741,000 18,364,000 41,882,000 47,184,000 126,390,000 8,581,000 41,908,000 48,887,000 104,736,000 14,509,000 36,850,000 40,320,000 68,824,000 -6,015,000 22,972,000 21,581,000  13,383,000 21,327,000 50,089,000 
      income tax expense
    13,000,000 9,000,000 2,000,000 1,000,000 12,000,000 677,000 -478,000 495,000 2,306,000         2,901,000 -5,432,000 2,398,000 12,164,000 5,579,000 859,000 -7,919,000 8,532,000 3,229,000 -131,000 -1,741,000 30,017,000 8,593,000 1,548,000 5,209,000 10,710,000 31,210,000 5,153,000 13,051,000 33,344,000 23,425,000 7,606,000 16,710,000 31,942,000  6,115,000 15,016,000 26,247,000  7,301,000 16,691,000 28,176,000  5,459,000 15,412,000 25,236,000 39,653,000 1,608,000 10,360,000 21,138,000 52,915,000 3,717,000 13,583,000 23,637,000                     
      net income
    92,000,000 71,000,000 29,000,000 14,000,000 79,000,000 67,160,000 18,487,000 22,858,000 71,495,000 84,135,000 14,716,000 17,484,000 54,845,000 77,956,000 -5,798,000 11,453,000 71,565,000 50,877,000 14,366,000 14,074,000 68,017,000 58,735,000 4,876,000 17,453,000 48,424,000 50,776,000 5,090,000 25,016,000 115,881,000 45,869,000 10,129,000 25,644,000 54,956,000 27,615,000 4,458,000 21,722,000 62,137,000 40,103,000 12,261,000 27,287,000 56,068,000  13,043,000 25,274,000 46,462,000  10,471,000 100,582,000 48,981,000  11,931,000 25,730,000 43,101,000 72,838,000 5,962,000 18,532,000 38,213,000 91,902,000 11,637,000 23,528,000 42,403,000 81,614,000 13,334,000 26,047,000 29,317,000 80,014,000 8,634,000 26,289,000 31,419,000 66,261,000 7,359,000 23,545,000 25,231,000 42,350,000 -3,875,000 14,183,000 14,094,000  10,073,000 13,459,000 31,572,000 
      yoy
    16.46% 5.72% 56.87% -38.75% 10.50% -20.18% 25.63% 30.74% 30.36% 7.93% -353.81% 52.66% -23.36% 53.22% -140.36% -18.62% 5.22% -13.38% 194.63% -19.36% 40.46% 15.67% -4.20% -30.23% -58.21% 10.70% -49.75% -2.45% 110.86% 66.10% 127.21% 18.06% -11.56% -31.14% -63.64% -20.39% 10.82%  -6.00% 7.96% 20.67%  24.56% -74.87% -5.14%  -12.24% 290.91% 13.64%  100.12% 38.84% 12.79% -20.74% -48.77% -21.23% -9.88% 12.61% -12.73% -9.67% 44.64% 2.00% 54.44% -0.92% -6.69% 20.76% 17.33% 11.65% 24.53% 56.46% -289.91% 66.01% 79.02%  -138.47% 5.38% -55.36%     
      qoq
    29.58% 144.83% 107.14% -82.28% 17.63% 263.28% -19.12% -68.03% -15.02% 471.72% -15.83% -68.12% -29.65% -1444.53% -150.62% -84.00% 40.66% 254.15% 2.07% -79.31% 15.80% 1104.57% -72.06% -63.96% -4.63% 897.56% -79.65% -78.41% 152.63% 352.85% -60.50% -53.34% 99.01% 519.45% -79.48% -65.04% 54.94% 227.08% -55.07% -51.33%   -48.39% -45.60%   -89.59% 105.35%   -53.63% -40.30% -40.83% 1121.70% -67.83% -51.50% -58.42% 689.74% -50.54% -44.51% -48.04% 512.07% -48.81% -11.15% -63.36% 826.73% -67.16% -16.33% -52.58% 800.41% -68.74% -6.68% -40.42% -1192.90% -127.32% 0.63%   -25.16% -57.37%  
      net income margin %
    16.14% 13.32% 7.20% 3.41% 12.80% 12.61% 4.70% 5.69% 11.73% 16.26% 3.88% 4.60% 11.56% 15.28% -1.61% 3.03% 15.49% 11.78% 4.85% 4.72% 16.47% 15.44% 1.79% 6.26% 12.41% 13.93% 1.79% 8.32% 29.23% 12.32% 3.42% 8.03% 13.42% 6.94% 1.50% 6.91% 14.24% 9.97% 4.04% 8.56% 13.41% NaN% 4.16% 7.49% 10.41% NaN% 3.47% 32.18% 9.98% NaN% 3.55% 7.31% 8.93% 6.04% 1.75% 5.39% 8.45% 7.20% 3.39% 6.53% 8.90% 6.85% 3.63% 7.22% 6.42% 6.68% 2.74% 8.56% 6.45% 5.12% 1.92% 6.72% 5.08% 3.68% -1.45% 4.67% 3.07% NaN% 3.44% 4.68% 6.32% 
      weighted-average common shares outstanding (thousands), basic
    82,339,000,000 80,975,000,000 81,232,000,000 80,715,000,000 80,218,000,000 78,725,000,000 78,836,000 78,390,000 78,161,000 76,396,000 76,734,000 75,983,000 75,169,000 72,989,000 73,229,000 72,624,000 71,787,000 69,951,000 70,054,000 69,404,000 69,293,000 67,962,000 68,194,000 67,481,000 67,239,000 66,205,000 66,265,000 65,894,000 65,733,000 65,673,000 65,688,000 65,677,000 65,639,000  64,412,000 64,401,000 64,362,000 63,508,000 63,857,000 63,386,000 62,605,000 62,301,000 62,299,000  62,318,000  63,934,000 60,184,000 60,122,000 59,960,000 59,994,000 59,937,000 59,866,000 59,028,000 59,047,000 58,702,000 58,581,000 57,872,000 58,057,000 57,787,000 57,342,000 55,595,000 55,616,000 55,031,000 54,869,000 54,694,000 54,706,000 54,654,000 54,616,000 53,637,000 53,773,000 53,301,000 53,020,000 52,796,000 52,834,000 52,775,000 52,684,000 49,162,000 49,098,000 48,958,000 48,795,000 
      weighted-average common shares outstanding (thousands), diluted
    82,354,000,000 81,051,000,000 81,278,000,000 80,774,000,000 80,309,000,000 78,820,000,000 78,968,000 78,456,000 78,211,000 76,495,000 76,761,000 76,131,000 75,275,000 73,093,000 73,298,000 72,658,000 71,930,000 70,085,000 70,129,000 69,534,000 69,506,000 68,102,000 68,337,000 67,589,000 67,381,000 66,329,000 66,351,000 65,963,000 65,941,000 65,946,000 66,026,000 65,983,000 65,931,000  64,892,000 64,553,000 64,469,000 63,920,000 64,325,000 63,783,000 62,907,000 62,708,000 62,688,000  62,889,000  64,244,000 60,463,000 60,168,000 59,997,000 60,032,000 59,962,000 59,898,000 59,201,000 59,123,000 58,924,000 58,950,000 58,092,000 58,232,000 58,143,000 57,414,000 55,824,000 55,801,000 55,231,000 55,115,000 54,942,000 55,094,000 54,827,000 54,722,000 54,028,000 54,205,000 53,704,000 53,382,000 53,263,000 52,834,000 53,313,000 53,322,000 49,897,000 49,902,000 49,694,000 49,305,000 
      earnings per common share:
                                                                                     
      basic
    1,110,000 870,000 360,000 170,000 980,000 2,288,560 230 290 910 1,090 190 230 730 1,070 -80 160 1,000 720 210 200 980 860 70 260 720 760 80 380 1,760 700 150 390 840 342.5 70 340 970    900        810  190 430 710 1,220 100 310 660 1,550 180 400 730 1,440 220 460 530 1,440 150 470 570             
      diluted
    1,110,000 870,000 360,000 170,000 980,000 2,288,560 230 290 910 1,100 190 230 730 1,060 -80 160 990 720 200 200 980 860 70 260 720 760 80 380 1,760 700 150 390 830 342.5 70 340 960    890        810  190 430 710 1,220 100 310 650 1,540 180 390 730 1,430 220 460 520 1,430 150 470 570             
      other expense-net
       6,000,000                -10,041,000  -504,750 -2,168,000 531,000  -5,933,000 180,000 -8,268,000                            678,000        -969,000                  
      utility revenues:
                                                                                     
      total utility revenues
         532,009,000 393,565,000 402,032,000 609,394,000 517,169,000 379,524,000 379,798,000 474,505,000 509,880,000 359,292,000 378,421,000 461,926,000 431,678,000 295,899,000 298,107,000 412,681,000 380,154,000 272,379,000 278,337,000 389,407,000 363,283,000 282,721,000 298,551,000 388,583,000 365,325,000 289,119,000 312,704,000 402,417,000                                                 
      non-utility revenues
         761,000 177,000 40,000 22,000 191,000 102,000 139,000 126,000 269,000 154,000 145,000 120,000 126,000 108,000 148,000 189,000 269,000 267,000 255,000 823,000 1,276,000 1,049,000 2,261,000 7,898,000 6,896,000 6,894,000 6,594,000 6,944,000 5,382,000 5,456,000 5,772,000 5,933,000 5,879,000 6,360,000 5,950,000 5,380,000  6,244,000 6,502,000 10,083,000  10,296,000 9,475,000      12,136,750 48,547,000 50,270,000 46,797,000 136,099,000 42,159,000 40,584,000                      
      income tax benefit
             -4,056,000 -3,786,000 -5,810,000 -6,628,000 -5,513,000 157,000 -999,000 -10,836,000                                             1,257,500 5,030,000   -13,250 -53,000               
      non-utility operating expenses:
                                                                                     
      merger transaction costs
                               11,000 19,664,000                                                     
      merger termination fee
                                -103,000,000                                                     
      net loss attributable to noncontrolling interests
                               303,000      5,250 -7,000                                               
      net income attributable to avista corp. shareholders
                         58,735,000 4,876,000 17,453,000 48,424,000 50,776,000 5,090,000 25,319,000 115,794,000 45,843,000 10,119,000 25,577,000 54,890,000 27,578,000 4,451,000 21,771,000 62,116,000 40,091,000 12,234,000 27,254,000 56,052,000  13,011,000 25,246,000 46,449,000  10,451,000 100,871,000                                  
      earnings per common share attributable to avista corp. shareholders:
                                                                                     
      basic
    1,110,000 870,000 360,000 170,000 980,000 2,288,560 230 290 910 1,090 190 230 730 1,070 -80 160 1,000 720 210 200 980 860 70 260 720 760 80 380 1,760 700 150 390 840 342.5 70 340 970    900        810  190 430 710 1,220 100 310 660 1,550 180 400 730 1,440 220 460 530 1,440 150 470 570             
      diluted
    1,110,000 870,000 360,000 170,000 980,000 2,288,560 230 290 910 1,100 190 230 730 1,060 -80 160 990 720 200 200 980 860 70 260 720 760 80 380 1,760 700 150 390 830 342.5 70 340 960    890        810  190 430 710 1,220 100 310 650 1,540 180 390 730 1,430 220 460 520 1,430 150 470 570             
      net income attributable to noncontrolling interests
                                -87,000    -66,000    -21,000 -12,000 -27,000 -33,000 -16,000  -32,000  -13,000  -20,000  -482,000  -518,000 -73,000  -44,000 -176,000 -354,000                          
      acquisition costs
                                 1,098,000 965,000 983,000 672,000 6,614,000 6,730,000                                               
      net income (income) attributable to noncontrolling interests
                                 -35,750 -10,000 -67,000    49,000        -28,000    289,000     -760,000    175,000                         
      dividends declared per common share
                                 279.375 372.5 372.5 372.5 268.125 357.5 357.5 357.5 342.5 342.5 342.5 342.5  330  330  317.5 317.5 317.5                                 
      utility revenues
                                     392,480,000 291,640,000 308,729,000 430,537,000 396,244,000 296,989,000 312,888,000 412,793,000  307,405,000 330,830,000 436,407,000  291,262,000 303,105,000 437,124,000  278,473,000 297,719,000 431,127,000 1,060,300,000 292,085,000 293,315,000 405,460,000 1,139,971,000 301,551,000 319,973,000 437,697,000 1,086,754,000 331,092,000 325,667,000 423,581,000 1,110,952,000 284,249,000 279,865,000 460,864,000 1,218,840,000 353,824,000 326,645,000 472,272,000 1,044,565,000 243,798,000 267,997,000 414,266,000  229,335,000 258,076,000 423,290,000 
      income from continuing operations before income taxes
                                         63,528,000 19,867,000 43,997,000   18,869,000 40,094,000 72,709,000  17,827,000 47,961,000                                  
      net income from continuing operations
                                         40,103,000 12,261,000 27,287,000   12,754,000 25,078,000 46,462,000  10,526,000 31,270,000                                  
      net income from discontinued operations
                                              289,000 196,000   -55,000                                   
      amounts attributable to avista corp. shareholders:
                                                                                     
      net income from continuing operations attributable to avista corp. shareholders
                                         24,284,250 12,234,000 27,254,000   12,722,000  46,449,000  10,506,000 31,254,000                                  
      net income from discontinued operations attributable to avista corp. shareholders
                                              289,000    -55,000 69,617,000                                  
      earnings per common share attributable to avista corp. shareholders, basic:
                                                                                     
      earnings per common share from continuing operations
                                         630 190 430   210  750  160 520                                  
      earnings per common share from discontinued operations
                                                   1,160                                  
      total earnings per common share attributable to avista corp. shareholders, basic
                                         630 190 430   210  750  160 1,680                                  
      earnings per common share attributable to avista corp. shareholders, diluted:
                                                                                     
      total earnings per common share attributable to avista corp. shareholders, diluted
                                         620 190 430   210  740  160 1,670                                  
      income from continuing operations
                                              35,912,000 57,360,000 89,575,000  32,762,000 62,731,000                                  
      net income on discontinued operations
                                                   69,312,000                                  
      ecova revenues
                                                    44,384,000  46,398,000 44,560,000 42,407,000                             
      other non-utility revenues
                                                    9,454,000  11,004,000 9,769,000 9,372,000        38,889,000 89,725,000 31,151,000 30,011,000 27,729,000 68,976,000 23,952,000 21,653,000 20,609,000 56,837,000 22,037,000 17,837,000 17,619,000 50,303,000 17,550,000 16,610,000 15,512,000  15,955,000 15,003,000 14,370,000 
      ecova operating expenses:
                                                                                     
      other non-utility operating expenses:
                                                                                     
      net income attributable to avista corporation shareholders
                                                    48,499,000  11,413,000 25,657,000 42,341,000                             
      earnings per common share attributable to avista corporation shareholders:
                                                                                     
      basic
    1,110,000 870,000 360,000 170,000 980,000 2,288,560 230 290 910 1,090 190 230 730 1,070 -80 160 1,000 720 210 200 980 860 70 260 720 760 80 380 1,760 700 150 390 840 342.5 70 340 970    900        810  190 430 710 1,220 100 310 660 1,550 180 400 730 1,440 220 460 530 1,440 150 470 570             
      diluted
    1,110,000 870,000 360,000 170,000 980,000 2,288,560 230 290 910 1,100 190 230 730 1,060 -80 160 990 720 200 200 980 860 70 260 720 760 80 380 1,760 700 150 390 830 342.5 70 340 960    890        810  190 430 710 1,220 100 310 650 1,540 180 390 730 1,430 220 460 520 1,430 150 470 570             
      dividends paid per common share
                                                      305 305 305 870 290 290 290 825 275 275 275 750 250 250 250 600 210 210 180 510 180 165 165 445 150 150 145  145 140 140 
      net income attributable to avista corporation
                                                         1,446,500 5,786,000 18,178,000 38,388,000 89,522,000 10,702,000 23,001,000 41,918,000 80,079,000 12,346,000 25,540,000 28,810,000 78,932,000 8,139,000 25,852,000 31,026,000             
      earnings per common share attributable to avista corporation:
                                                                                     
      basic
    1,110,000 870,000 360,000 170,000 980,000 2,288,560 230 290 910 1,090 190 230 730 1,070 -80 160 1,000 720 210 200 980 860 70 260 720 760 80 380 1,760 700 150 390 840 342.5 70 340 970    900        810  190 430 710 1,220 100 310 660 1,550 180 400 730 1,440 220 460 530 1,440 150 470 570             
      diluted
    1,110,000 870,000 360,000 170,000 980,000 2,288,560 230 290 910 1,100 190 230 730 1,060 -80 160 990 720 200 200 980 860 70 260 720 760 80 380 1,760 700 150 390 830 342.5 70 340 960    890        810  190 430 710 1,220 100 310 650 1,540 180 390 730 1,430 220 460 520 1,430 150 470 570             
      less: net income attributable to noncontrolling interests
                                                             -2,380,000 -935,000 -527,000 -485,000 -1,535,000 -988,000 -507,000 -507,000 -1,082,000 -495,000 -437,000 -393,000             
      non-utility energy revenues
                                                                 1,232,250 4,929,000 5,055,000 5,105,000                 
      income taxes
                                                                   15,835,000 17,867,000   15,619,000 17,468,000 38,475,000 7,150,000 13,305,000 15,089,000 26,474,000 -2,140,000 8,789,000 7,487,000  3,310,000 7,868,000 18,517,000 
      other income - net:
                                                                                     
      total other income-net
                                                                    -20,640,000   -16,174,000 -16,958,000 -54,843,000 -10,823,000 -19,640,000 -18,741,000 -53,869,000 -21,751,000 -17,246,000 -17,356,000  -20,708,000 -21,251,000 -20,849,000 
      non-utility energy marketing and trading revenues
                                                                     17,945,000 6,491,000 5,593,000 5,997,000 18,401,000 6,824,000 5,828,000 6,416,000 55,227,000 6,314,000 19,398,000 29,409,000  47,711,000 14,315,000 61,542,000 
      other income:
                                                                                     
      other income - net
                                                                     38,250 153,000 -210,000 -560,000 2,205,000 7,104,000 1,721,000 1,043,000      2,736,000 2,078,000 2,475,000 
      total other income - net
                                                                     -3,793,250 -15,173,000               
      regulatory disallowance of unamortized debt repurchase costs
                                                                              -3,850,000       
      total earnings per common share, basic
                                                                         1,230 140 440 480 800 -70 270 270  210  650 
      total earnings per common share, diluted
                                                                         1,230 130 440 470 790 -70 260 260  200  640 
      gain on sale of utility properties
                                                                                     
      total earnings per common share, basic and diluted
                                                                                   270  
    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 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 2009-06-30 2009-03-31 2008-12-31 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 
                                                                                       
        assets:
                                                                                       
        current assets:
                                                                                       
        cash and cash equivalents
      18,000,000 19,000,000 44,000,000 9,000,000 17,000,000 30,000,000 9,124,000 14,647,000 12,274,000 35,003,000 8,630,000 15,704,000 10,596,000 13,428,000 14,363,000 21,619,000 203,598,000 22,168,000 19,224,000 39,027,000 21,647,000 14,196,000 84,747,000 116,394,000 18,919,000 9,896,000 14,454,000 17,231,000 14,861,000 14,656,000 21,170,000 35,333,000 26,273,000 16,172,000 14,716,000 13,410,000 26,179,000 8,507,000 7,084,000 13,522,000 12,767,000 10,484,000 9,314,000 16,242,000 22,081,000 22,143,000 10,391,000 207,967,000 90,172,000 82,574,000 91,979,000 85,411,000 89,197,000 75,464,000 82,952,000 93,416,000 72,703,000 74,662,000 78,103,000 69,916,000 61,837,000 69,413,000 56,682,000 38,530,000 39,603,000 37,035,000 35,025,000 34,458,000 35,654,000 24,313,000 15,030,000 5,384,000 12,986,000 11,839,000 5,190,000 103,302,000 56,974,000 28,242,000 31,600,000 35,849,000 71,090,000 
        accounts receivable-less allowances of 6 and 5, respectively
      195,000,000                                                                                 
        inventory
      241,000,000 236,000,000 228,000,000 216,000,000 202,000,000 193,000,000 185,940,000 175,588,000 163,709,000 159,984,000 145,174,000 115,805,000 101,775,000                                                                     
        regulatory assets
      184,000,000 135,000,000 129,000,000 122,000,000 105,000,000 137,000,000 115,197,000 130,389,000 84,590,000 146,327,000 167,927,000 163,906,000 210,097,000 193,787,000 59,573,000 44,199,000 34,733,000 43,783,000 37,768,000 27,174,000 29,225,000 13,673,000 11,194,000 11,177,000 13,057,000 21,851,000 19,890,000 38,785,000 41,566,000 48,552,000 21,525,000 27,404,000                                                  
        other current assets
      97,000,000 119,000,000 109,000,000 150,000,000 127,000,000 91,000,000 71,107,000 76,717,000 83,398,000 103,784,000 93,589,000 89,881,000 116,665,000 151,167,000 101,293,000 79,230,000 88,143,000 80,754,000 81,384,000 83,140,000 82,922,000 84,885,000 26,577,000 42,362,000 30,328,000 40,142,000 36,993,000 30,599,000 60,948,000 54,010,000 35,159,000 22,516,000 44,608,000 52,318,000 46,246,000 62,403,000 58,718,000 49,625,000 35,879,000 39,786,000 37,167,000 29,937,000 39,081,000 43,428,000 43,639,000 45,071,000 38,520,000 38,114,000 44,526,000 57,706,000 39,721,000 34,647,000 39,103,000 24,641,000 31,785,000 28,571,000 26,943,000 49,225,000 34,560,000 27,468,000 29,757,000 21,831,000 11,964,000 13,944,000 14,924,000 15,315,000 13,313,000 24,360,000 16,275,000 13,654,000 9,346,000 16,220,000 16,123,000 16,443,000 56,824,000 67,508,000 29,068,000 44,264,000 42,087,000 54,813,000 92,243,000 
        total current assets
      735,000,000 729,000,000 665,000,000 667,000,000 667,000,000 656,000,000 525,074,000 550,860,000 561,945,000 661,842,000 547,220,000 526,939,000 655,700,000 721,802,000 463,604,000 416,961,000 596,076,000 434,473,000 356,275,000 361,954,000 350,082,000 343,977,000 299,662,000 352,507,000 274,238,000 305,129,000 247,646,000 269,767,000 364,803,000 346,923,000 245,512,000 259,985,000 309,747,000 337,534,000 316,634,000 320,736,000 357,292,000 351,341,000 284,375,000 268,719,000 279,224,000 306,046,000 257,980,000 289,330,000 310,496,000 395,347,000 265,204,000 442,267,000 504,386,000 549,679,000 485,844,000 468,693,000 507,014,000 505,794,000 516,316,000 555,365,000 607,201,000 614,556,000 548,253,000 455,348,000 465,159,000 579,565,000 458,629,000 407,047,000 426,667,000 418,923,000 358,421,000 356,955,000 429,983,000 482,227,000 392,169,000 447,038,000 438,583,000 332,185,000 362,216,000 561,189,000 1,203,025,000 1,032,274,000 982,204,000 1,030,184,000 1,264,055,000 
        net utility property
      6,405,000,000 6,319,000,000 6,203,000,000 6,133,000,000 6,034,000,000 5,987,000,000 5,924,390,000 5,827,143,000 5,748,295,000 5,700,056,000 5,625,068,000 5,548,651,000 5,472,134,000 5,444,709,000 5,378,844,000 5,307,406,000 5,250,277,000 5,225,515,000 5,168,825,000 5,100,762,000 5,027,103,000 4,991,612,000 4,930,359,000 4,883,133,000 4,842,318,000 4,797,007,000 4,727,014,000 4,684,654,000 4,626,054,000 4,648,930,000 4,555,440,000 4,485,698,000                                                  
        goodwill
      52,000,000 52,000,000 52,000,000 52,000,000 52,000,000 52,000,000 52,426,000 52,426,000 52,426,000 52,426,000 52,426,000 52,426,000 52,426,000 52,426,000 52,426,000 52,426,000 52,426,000 52,426,000 52,426,000 52,426,000 52,426,000 52,426,000 52,426,000 52,426,000 52,426,000 52,426,000 52,426,000 52,426,000 52,426,000 57,672,000 57,672,000 57,672,000 57,672,000 57,672,000 57,672,000 57,672,000 57,672,000 57,672,000 57,672,000 57,672,000 57,672,000 57,672,000 57,672,000 57,672,000 57,976,000 57,976,000 55,877,000 5,246,000 76,257,000 76,257,000 76,762,000 76,762,000 76,762,000 75,959,000 73,783,000 73,783,000 73,783,000 39,045,000 26,112,000 26,112,000 25,965,000 25,935,000 24,790,000 24,790,000 24,790,000 24,718,000 24,820,000 20,509,000 20,509,000             
        non-current regulatory assets
      824,000,000 871,000,000 878,000,000 851,000,000 817,000,000 847,000,000 867,242,000 844,767,000 887,621,000 894,168,000 855,099,000 861,491,000 839,272,000 833,328,000 836,538,000 839,155,000 838,623,000 860,626,000 875,952,000 870,095,000 705,921,000 750,443,000 737,541,000 752,090,000 750,866,000 670,802,000 688,814,000 630,451,000 605,497,000 614,354,000 576,863,000 581,495,000                                                  
        other property and investments-net and other non-current assets
      392,000,000 388,000,000 364,000,000 362,000,000 396,000,000 399,000,000 411,751,000 408,574,000 398,697,000 393,985,000 390,217,000 381,808,000 374,394,000 365,085,000 324,387,000 321,766,000 298,608,000 280,543,000 278,000,000 261,064,000 263,964,000 263,639,000 263,143,000 262,468,000 254,151,000 257,092,000 248,883,000 240,630,000 241,203,000 114,697,000 121,911,000 116,930,000 91,536,000 83,912,000 80,022,000 79,487,000 76,525,000 72,224,000 55,799,000 64,343,000 54,065,000                                         
        total assets
      8,408,000,000 8,359,000,000 8,162,000,000 8,065,000,000 7,966,000,000 7,941,000,000 7,780,883,000 7,683,770,000 7,648,984,000 7,702,477,000 7,470,030,000 7,371,315,000 7,393,926,000 7,417,350,000 7,055,799,000 6,937,714,000 7,036,010,000 6,853,583,000 6,731,478,000 6,646,301,000 6,399,496,000 6,402,097,000 6,283,131,000 6,302,624,000 6,173,999,000 6,082,456,000 5,964,783,000 5,877,928,000 5,889,983,000 5,782,576,000 5,557,398,000 5,501,780,000 5,485,183,000 5,514,732,000 5,452,232,000 5,373,004,000 5,340,359,000 5,309,755,000 5,215,106,000 5,069,021,000 4,956,013,000 4,906,649,000 4,739,206,000 4,679,989,000 4,689,029,000 4,712,331,000 4,336,346,000 4,202,130,000 4,316,078,000 4,361,923,000 4,402,002,000 4,347,796,000 4,332,138,000 4,313,179,000 4,190,256,000 4,216,355,000 4,254,004,000 4,214,531,000 3,968,586,000 3,842,896,000 3,823,785,000 3,940,095,000 3,752,627,000 3,661,225,000 3,670,236,000 3,606,959,000 3,557,980,000 3,497,842,000 3,543,702,000 3,630,747,000 3,385,084,000 3,399,869,000 3,322,835,000 3,189,797,000 3,160,122,000 3,305,130,000 3,904,629,000 4,056,508,000 3,949,609,000 4,067,037,000 4,306,437,000 
        liabilities and equity:
                                                                                       
        current liabilities:
                                                                                       
        accounts payable
      119,000,000 163,000,000 118,000,000 111,000,000 113,000,000 125,000,000 104,512,000 104,620,000 102,886,000 143,262,000 105,320,000 103,587,000 112,230,000 202,954,000 112,646,000 121,315,000 112,126,000 133,096,000 102,824,000 104,048,000 93,100,000 106,613,000 83,697,000 110,675,000 88,184,000 110,219,000 91,358,000 80,619,000 109,922,000 108,372,000 80,892,000 76,558,000 67,168,000  72,777,000 69,165,000   81,898,000 63,056,000 59,140,000  63,172,000  62,853,000  82,366,000 73,349,000 163,655,000      140,536,000 148,734,000 134,261,000 166,954,000 154,249,000 128,853,000 150,648,000 171,707,000 148,906,000 123,452,000 146,870,000 160,861,000 133,135,000 104,419,000 136,648,000 176,116,000 102,917,000 86,740,000 139,468,000 117,546,000 75,083,000 179,589,000 243,910,000  201,926,000 230,095,000 336,323,000 
        short-term borrowings
      385,000,000 388,000,000 287,000,000 270,000,000 287,000,000 354,000,000 287,250,000 244,000,000 212,155,000 349,000,000 221,500,000 203,000,000 231,000,000 463,000,000 268,000,000 158,000,000  284,000,000 199,075,000 296,000,000 193,000,000 203,000,000 150,000,000 321,000,000 185,000,000 185,800,000 119,300,000 169,000,000 119,000,000 190,000,000 35,000,000  50,000,000  106,298,000 136,398,000   84,000,000 160,000,000 90,000,000  130,000,000  65,000,000  35,000,000 151,500,000 111,000,000      82,000,000 91,000,000 47,000,000 96,000,000 96,500,000 75,000,000 65,000,000 110,000,000 75,000,000 87,900,000 75,300,000 92,700,000 33,400,000 263,400,000 226,100,000 252,200,000 86,500,000 48,500,000 29,000,000   16,000,000   62,000,000 7,000,000 23,490,000 
        regulatory liabilities
      94,000,000 126,000,000 117,000,000 108,000,000 102,000,000 108,000,000 92,195,000 94,385,000 62,679,000 76,007,000 73,843,000 79,093,000 85,462,000 95,665,000 98,081,000 94,609,000 109,278,000 77,149,000 75,559,000 70,176,000 45,067,000 46,435,000 48,902,000 49,629,000 66,336,000 51,715,000 43,442,000 37,954,000 55,464,000 113,209,000 94,978,000 88,500,000                                                  
        other current liabilities
      222,000,000 201,000,000 207,000,000 179,000,000 219,000,000 184,000,000 201,198,000 166,761,000 187,560,000 191,936,000 182,801,000 148,483,000 162,395,000 189,415,000 192,973,000 172,977,000 170,521,000 168,861,000 171,728,000 171,685,000 161,632,000 149,831,000 140,240,000 123,258,000 174,286,000 130,979,000 130,089,000 124,169,000 175,454,000 120,358,000 133,404,000 121,414,000 83,184,000  61,436,000 64,417,000   164,119,000 177,450,000 178,809,000  146,368,000  160,130,000  128,726,000 123,630,000 180,834,000      147,723,000 130,387,000 149,547,000 141,789,000 139,252,000 109,331,000 119,837,000 110,547,000 111,192,000 93,135,000 107,591,000 106,980,000  115,539,000 107,940,000 101,592,000 100,651,000 86,513,000 110,994,000 84,537,000 76,716,000 71,088,000 76,365,000  67,764,000 92,281,000 151,414,000 
        total current liabilities
      820,000,000 878,000,000 729,000,000 668,000,000 721,000,000 771,000,000 700,155,000 624,766,000 580,280,000 775,205,000 583,464,000 541,163,000 604,587,000 964,534,000 685,200,000 553,401,000 641,925,000 913,106,000 799,186,000 891,909,000 492,799,000 505,879,000 474,839,000 656,562,000 565,806,000 530,713,000 399,185,000 516,735,000 566,642,000 639,584,000 346,903,000 289,070,000 669,697,000  673,251,000 682,114,000   341,882,000 501,714,000 431,841,000  447,737,000  325,628,000  270,819,000 464,331,000 570,221,000      547,853,000 584,649,000 605,029,000 627,174,000 576,552,000 454,949,000 454,115,000 579,175,000 531,624,000 476,558,000 505,624,000 503,417,000 447,279,000 621,836,000 623,586,000 688,544,000 595,127,000 616,026,000 640,297,000 763,649,000 631,051,000 784,351,000 1,108,086,000  1,093,260,000 1,091,252,000 1,313,667,000 
        long-term debt
      2,754,000,000 2,754,000,000 2,753,000,000 2,749,000,000 2,614,000,000 2,614,000,000 2,598,646,000 2,598,398,000 2,597,791,000 2,515,358,000 2,530,216,000 2,530,001,000 2,530,009,000 2,281,013,000 2,280,802,000 2,287,606,000 2,294,179,000 1,898,370,000 1,898,235,000 1,758,961,000 2,008,742,000 2,008,534,000 2,009,300,000 1,844,161,000 1,843,981,000                       1,268,530,000 1,272,530,000      1,148,047,000 1,147,765,000 1,170,175,000 1,169,826,000 1,084,661,000 1,094,978,000 1,101,814,000 1,101,499,000 1,039,234,000 1,039,059,000 1,039,010,000 1,036,149,000 1,060,951,000 810,106,000 809,686,000 809,258,000 778,913,000 778,328,000 752,536,000 521,489,000 655,207,000 655,377,000 950,053,000  819,039,000 820,400,000 827,598,000 
        long-term debt to affiliated trusts
      52,000,000 52,000,000 52,000,000 52,000,000 52,000,000 52,000,000 51,547,000 51,547,000 51,547,000 51,547,000 51,547,000 51,547,000 51,547,000 51,547,000 51,547,000 51,547,000 51,547,000 51,547,000 51,547,000 51,547,000 51,547,000 51,547,000 51,547,000 51,547,000 51,547,000 51,547,000 51,547,000 51,547,000 51,547,000 51,547,000 51,547,000 51,547,000 51,547,000  51,547,000 51,547,000   51,547,000 51,547,000 51,547,000  51,547,000  51,547,000  51,547,000 51,547,000 51,547,000      51,547,000 51,547,000 51,547,000 51,547,000 51,547,000 51,547,000 51,547,000 51,547,000 51,547,000 51,547,000 51,547,000 51,547,000 51,547,000 51,547,000 113,403,000 113,403,000 113,403,000 113,403,000 113,403,000 113,403,000 113,403,000 113,403,000 113,403,000  113,403,000 113,403,000 113,403,000 
        pensions and other postretirement benefits
      64,000,000 65,000,000 72,000,000 72,000,000 73,000,000 75,000,000 88,619,000 92,211,000 88,568,000 89,830,000 92,228,000 92,741,000 93,254,000 93,901,000 114,866,000 128,187,000 140,575,000 153,467,000 177,333,000 188,912,000 199,670,000 211,880,000 199,912,000 204,506,000 207,313,000 212,006,000 210,292,000 214,983,000 218,456,000 222,537,000 191,021,000 195,227,000 200,162,000  216,464,000 219,584,000   202,329,000 202,063,000 202,013,000  188,711,000  188,798,000  95,037,000 103,421,000 113,416,000      214,838,000 225,250,000 235,576,000 246,177,000 162,548,000 169,557,000 157,698,000 161,189,000 109,432,000 114,426,000 118,839,000 123,281,000 144,876,000 157,334,000 170,739,000 184,588,000 67,193,000 79,595,000 83,709,000 90,555,000 93,705,000 99,120,000 98,239,000     
        deferred income taxes
      793,000,000 778,000,000 770,000,000 757,000,000 745,000,000 751,000,000 726,175,000 718,728,000 712,275,000 718,318,000 726,265,000 703,683,000 694,216,000 674,995,000 666,115,000 657,583,000 646,736,000 642,709,000 634,215,000 620,020,000 607,707,000 594,712,000 550,571,000 540,494,000 525,217,000 528,513,000 515,355,000 508,139,000 501,928,000 487,602,000 488,767,000 472,551,000 464,596,000  903,943,000 886,727,000   816,334,000 783,955,000 762,522,000  20,646,000 19,576,000 20,589,000 14,794,000 8,316,000 8,266,000 24,288,000 24,788,000 28,740,000 32,860,000 31,968,000 34,281,000 35,792,000 36,711,000 36,598,000 30,473,000 23,470,000 25,786,000 26,298,000 28,822,000 28,827,000 27,840,000 29,482,000 34,473,000 17,526,000 17,608,000 18,509,000 18,561,000 16,910,000 20,055,000 21,401,000 20,251,000 19,969,000 20,479,000 14,769,000 10,932,000 12,639,000 15,093,000 11,729,000 
        non-current regulatory liabilities
      820,000,000 818,000,000 847,000,000 843,000,000 843,000,000 834,000,000 840,047,000 829,061,000 864,661,000 856,666,000 863,717,000 845,022,000 840,211,000 840,837,000 845,495,000 846,873,000 850,702,000 861,515,000 886,351,000 882,443,000 783,784,000 784,820,000 773,641,000 778,826,000 783,376,000 775,436,000 786,131,000 789,655,000 786,233,000 780,701,000 798,440,000 799,661,000                                                  
        other non-current liabilities and deferred credits
      329,000,000 305,000,000 294,000,000 279,000,000 269,000,000 253,000,000 247,606,000 241,820,000 233,362,000 210,230,000 212,706,000 206,737,000 194,791,000 175,855,000 176,925,000 175,023,000 177,046,000 178,125,000 182,975,000 182,543,000 186,657,000 214,999,000 240,470,000 251,490,000 237,664,000 201,189,000 229,339,000 211,401,000 195,748,000 71,031,000 69,425,000 69,433,000        165,419,000 174,080,000  165,838,000  149,165,000  120,553,000 114,537,000 119,295,000      105,481,000 104,379,000 110,001,000 116,084,000 91,995,000 92,898,000 96,125,000 109,703,000 124,523,000 86,992,000 84,137,000 52,665,000 71,293,000 96,152,000 85,000,000 93,212,000 79,316,000 74,833,000 70,281,000 83,046,000 71,233,000 69,887,000 65,261,000  107,354,000 101,132,000 98,484,000 
        total liabilities
      5,632,000,000 5,650,000,000 5,517,000,000 5,420,000,000 5,317,000,000 5,350,000,000 5,252,795,000 5,156,531,000 5,128,484,000 5,217,154,000 5,060,143,000 4,970,894,000 5,008,615,000 5,082,682,000 4,820,950,000 4,700,220,000 4,802,710,000 4,698,839,000 4,629,842,000 4,576,335,000 4,330,906,000 4,372,371,000 4,300,280,000 4,327,586,000 4,214,904,000 4,143,172,000 4,071,215,000 3,993,894,000 4,021,761,000 4,008,531,000 3,807,047,000 3,739,073,000 3,726,612,000  3,781,286,000 3,686,110,000   3,586,582,000 3,452,284,000 3,366,745,000  3,231,009,000  3,182,270,000  2,844,589,000 2,792,585,000 2,949,005,000      2,906,348,000 2,946,517,000 2,988,700,000 2,976,847,000 2,746,128,000 2,622,941,000 2,621,161,000 2,768,189,000 2,603,603,000 2,538,554,000 2,567,505,000 2,521,512,000 2,510,775,000 2,455,310,000 2,513,382,000 2,633,864,000 2,406,432,000 2,434,048,000 2,383,725,000 2,275,831,000 2,247,226,000 2,378,540,000 2,977,355,000  3,130,951,000 3,248,332,000 3,499,533,000 
        commitments and contingencies
                                                                                       
        equity:
                                                                                       
        shareholders’ equity:
                                                                                       
        common stock
      1,821,000,000 1,805,000,000 1,771,000,000 1,760,000,000 1,737,000,000 1,720,000,000 1,686,776,000 1,666,692,000 1,645,208,000 1,644,327,000 1,618,780,000 1,588,503,000 1,555,651,000 1,525,185,000 1,478,443,000 1,443,102,000 1,418,421,000 1,380,152,000 1,349,960,000 1,303,411,000 1,285,999,000 1,286,068,000 1,265,191,000 1,234,901,000 1,209,312,000 1,210,741,000 1,186,925,000 1,157,024,000 1,140,242,000 1,136,491,000 1,135,543,000 1,134,304,000 1,131,549,000  1,077,215,000 1,075,667,000   1,073,481,000 1,052,190,000 1,032,023,000  1,002,716,000  998,975,000  1,007,764,000 885,741,000 899,037,000      887,530,000 861,053,000 857,747,000 855,188,000  842,054,000 833,617,000 827,592,000 815,011,000 788,796,000 779,828,000 778,647,000 776,977,000 774,889,000 775,813,000 774,986,000 773,198,000   726,933,000 723,054,000 720,349,000      
        accumulated other comprehensive loss
      -1,000,000 -1,000,000     -375,000 -366,000 -366,000 -357,000 -2,114,000 -2,095,000 -2,076,000 -2,058,000 -10,218,000 -10,490,000 -10,763,000 -11,039,000 -13,451,000 -13,755,000 -14,063,000 -14,378,000 -9,614,000 -9,834,000 -10,054,000 -10,259,000 -7,383,000 -7,545,000 -7,706,000 -7,866,000 -9,220,000 -9,424,000 -9,628,000  -7,020,000 -7,202,000   -7,599,000 -7,739,000 -7,879,000  -7,151,000  -7,642,000  -3,898,000 -4,010,000 -4,925,000      -4,897,000 -5,158,000 -5,426,000 -5,637,000 -4,339,000 -4,462,000 -4,522,000 -4,326,000 -2,242,000 -2,278,000 -2,314,000 -2,350,000 -5,790,000 -5,891,000 -5,991,000 -6,092,000 -12,104,000 -12,223,000 -12,342,000 -19,608,000 -18,544,000 -15,854,000 -16,388,000  -22,915,000 -16,955,000 -18,086,000 
        retained earnings
      956,000,000 905,000,000 874,000,000 885,000,000 912,000,000 871,000,000 841,687,000 860,913,000 875,658,000 841,353,000 793,221,000 814,013,000 831,736,000 811,541,000 766,624,000 804,882,000 825,642,000 785,631,000 765,127,000 780,310,000 796,654,000 758,036,000 727,274,000 749,971,000 759,837,000 738,802,000 714,026,000 734,555,000 734,774,000 644,595,000 623,229,000 637,578,000 636,468,000  600,132,000 618,708,000   562,905,000 572,576,000 565,447,000  512,988,000  515,842,000  488,342,000 528,285,000 436,370,000      377,111,000 360,947,000 355,818,000 336,150,000 326,548,000 330,543,000 331,284,000 302,518,000 293,721,000 299,349,000 285,938,000 274,990,000 264,975,000 264,027,000 249,398,000 227,989,000 217,558,000 244,461,000 223,745,000 206,641,000 208,386,000 222,095,000 225,724,000  208,367,000 205,280,000 198,330,000 
        total shareholders’ equity
      2,776,000,000  2,645,000,000 2,645,000,000 2,649,000,000  2,528,088,000 2,527,239,000 2,520,500,000  2,409,887,000 2,400,421,000 2,385,311,000  2,234,849,000 2,237,494,000 2,233,300,000  2,101,636,000 2,069,966,000 2,068,590,000                                                             
        total liabilities and equity
      8,408,000,000 8,359,000,000 8,162,000,000 8,065,000,000 7,966,000,000 7,941,000,000 7,780,883,000 7,683,770,000 7,648,984,000 7,702,477,000 7,470,030,000 7,371,315,000 7,393,926,000 7,417,350,000 7,055,799,000 6,937,714,000 7,036,010,000 6,853,583,000 6,731,478,000 6,646,301,000 6,399,496,000 6,402,097,000 6,283,131,000 6,302,624,000 6,173,999,000 6,082,456,000 5,964,783,000 5,877,928,000 5,889,983,000 5,782,576,000 5,557,398,000 5,501,780,000 5,485,183,000  5,452,232,000 5,373,004,000   5,215,106,000 5,069,021,000 4,956,013,000  4,739,206,000  4,689,029,000  4,336,346,000 4,202,130,000 4,316,078,000      4,190,256,000 4,216,355,000 4,254,004,000 4,214,531,000 3,968,586,000 3,842,896,000 3,823,785,000 3,940,095,000 3,752,627,000 3,661,225,000 3,670,236,000 3,606,959,000                
        accounts and notes receivable
       220,000,000    205,000,000 143,706,000 153,519,000 217,974,000 216,744,000 131,900,000 141,643,000 216,567,000 255,746,000 164,928,000 166,122,000 193,200,000 203,035,000 130,696,000 129,835,000 153,128,000 163,772,000 108,118,000 115,241,000 155,253,000 166,657,000 108,577,000 115,493,000 170,200,000 165,824,000 104,892,000 117,831,000 168,534,000 185,664,000 125,595,000 133,946,000 179,403,000 180,265,000 116,054,000 121,277,000 149,537,000 169,413,000 110,837,000 136,321,000 162,203,000 171,925,000 124,550,000 127,614,000 202,820,000 221,343,000 139,512,000 147,851,000 190,197,000 193,683,000 141,659,000 148,079,000 188,726,000 203,452,000 155,072,000 165,317,000 218,436,000 230,229,000 159,533,000 164,810,000 199,957,000 210,645,000 149,492,000 127,926,000 215,542,000 218,846,000 93,332,000 149,379,000 223,725,000 105,440,000 112,718,000 187,639,000 258,932,000 286,150,000 188,035,000 211,161,000 347,578,000 
        total equity
       2,709,000,000    2,591,000,000    2,485,323,000    2,334,668,000    2,154,744,000    2,029,726,000    1,939,284,000 1,893,568,000 1,884,034,000 1,868,222,000 1,774,045,000 1,750,351,000 1,762,707,000 1,758,571,000  1,670,946,000 1,686,894,000   1,628,524,000 1,616,737,000 1,589,268,000  1,508,197,000  1,506,759,000  1,491,757,000 1,409,545,000 1,351,113,000      1,277,182,000 1,216,414,000 1,207,671,000 1,185,875,000 1,170,388,000 1,167,588,000 1,159,807,000 1,125,184,000 1,105,871,000 1,085,210,000 1,062,782,000 1,050,614,000                
        accounts receivable-less allowances of 5
        155,000,000 170,000,000                                                                              
        accounts receivable-less allowances of 7, and 5, respectively
          216,000,000                                                                             
        current portion of long-term debt
            15,000,000 15,000,000 15,000,000 15,000,000  7,000,000 13,500,000 13,500,000 13,500,000 6,500,000 250,000,000 250,000,000 250,000,000 250,000,000   52,000,000 52,000,000 52,000,000                       4,348,000 372,000      392,000 423,000 7,409,000 7,474,000 7,370,000 7,363,000 360,000 358,000 25,350,000 35,348,000 35,316,000 35,189,000 27,206,000 17,136,000 17,132,000 17,207,000 108,916,000 110,383,000 179,700,000 427,344,000 307,608,000 307,720,000 14,607,000  170,760,000 201,435,000 201,476,000 
        materials and supplies, fuel stock and stored natural gas
                   107,674,000 123,447,000 105,791,000 76,402,000 84,733,000 87,203,000 82,778,000 63,160,000 67,451,000 69,026,000 67,333,000 56,681,000 66,583,000 67,732,000 67,659,000 61,354,000 63,881,000 62,766,000 56,901,000 49,259,000 58,075,000 65,961,000 61,187,000 47,184,000 53,314,000 58,080,000 51,639,000 43,885,000 54,148,000 59,735,000                                       
        avista corporation shareholders’ equity:
                                                                                       
        total avista corporation shareholders’ equity
                            1,982,851,000 1,975,038,000 1,959,095,000 1,939,284,000 1,893,568,000 1,884,034,000 1,867,310,000 1,773,220,000 1,749,552,000 1,762,458,000 1,758,389,000  1,670,327,000 1,687,173,000   1,628,787,000 1,617,027,000 1,589,591,000  1,508,553,000  1,507,175,000  1,492,208,000 1,410,016,000 1,330,482,000                                 
        current portion of long-term debt and capital leases
                               52,000,000 14,996,000 104,993,000 104,989,000 107,645,000 2,629,000 2,598,000 275,066,000  277,626,000 277,814,000   3,257,000 93,227,000 93,197,000  93,105,000  3,132,000  6,471,000                                   
        long-term debt and capital leases
                               1,843,768,000 1,879,366,000 1,701,434,000 1,701,207,000 1,755,529,000 1,860,944,000 1,861,584,000 1,491,395,000  1,491,789,000 1,403,064,000   1,678,257,000 1,479,668,000 1,479,791,000  1,391,611,000  1,495,546,000  1,412,211,000                                   
        noncontrolling interests
                                  912,000 825,000 799,000 249,000 182,000  619,000 -279,000   -263,000 -290,000 -323,000  -356,000  -416,000  -451,000 -471,000 20,631,000      17,438,000 -428,000 -468,000 174,000 -530,000 -547,000 -572,000 -600,000 -619,000 -657,000 -670,000 -673,000 11,043,000 9,507,000 11,100,000             
        assets held for sale
                                  15,874,000                                                600,962,000 3,543,000 20,920,000 21,882,000 22,426,000 
        liabilities held for sale
                                  1,813,000                                                574,372,000     
        regulatory asset for energy commodity derivatives
                                      21,073,000 24,991,000 22,005,000 13,982,000 11,649,000 11,365,000                                            
        net utility property:
                                                                                       
        utility plant in service
                                      5,882,288,000 5,853,308,000 5,686,633,000 5,617,233,000 5,543,736,000 5,506,499,000 5,386,982,000 5,303,883,000 5,218,583,000 5,129,192,000 5,007,349,000 4,941,008,000 4,858,902,000 4,718,062,000 4,655,329,000 4,385,131,000 4,341,383,000 4,290,464,000 4,252,299,000 4,185,614,000 4,115,253,000 4,054,644,000 3,994,743,000 3,964,150,000 3,921,154,000 3,887,384,000 3,832,705,000 3,767,321,000 3,725,511,000 3,713,885,000 3,669,254,000 3,621,854,000 3,589,109,000 3,549,658,000 3,487,589,000 3,449,736,000 3,371,959,000 3,343,535,000 3,241,562,000 3,204,044,000 3,151,356,000 3,131,916,000 3,062,726,000 2,990,655,000 2,959,749,000 2,938,456,000 2,913,410,000 2,886,723,000 2,867,965,000 
        construction work in progress
                                      165,113,000 157,839,000 194,679,000 169,000,000 158,271,000 150,474,000 165,559,000 187,946,000 174,877,000 202,683,000 193,000,000 174,482,000 148,291,000 227,758,000 205,572,000 191,611,000 157,330,000 160,323,000 137,565,000 133,166,000 134,741,000 143,098,000 116,624,000 92,649,000 80,023,000 79,322,000 67,393,000 74,107,000 66,593,000 62,051,000 58,613,000 59,513,000 60,575,000 60,055,000 60,577,000 47,372,000 78,362,000 77,487,000 128,491,000 108,880,000 115,284,000 100,106,000 115,313,000 133,033,000 115,920,000 103,226,000 97,236,000 83,421,000 60,788,000 
        total
                                      6,047,401,000 6,011,147,000 5,881,312,000 5,786,233,000 5,702,007,000 5,656,973,000 5,552,541,000 5,491,829,000 5,393,460,000 5,331,875,000 5,200,349,000 5,115,490,000 5,007,193,000 4,945,820,000 4,860,901,000 4,576,742,000 4,498,713,000 4,450,787,000 4,389,864,000 4,318,780,000 4,249,994,000 4,197,742,000 4,111,367,000 4,056,799,000 4,001,177,000 3,966,706,000 3,900,098,000 3,841,428,000 3,792,104,000 3,775,936,000 3,727,867,000 3,681,367,000 3,649,684,000 3,609,713,000 3,548,166,000 3,497,108,000 3,450,321,000 3,421,022,000 3,370,053,000 3,312,924,000 3,266,640,000 3,232,022,000 3,178,039,000 3,123,688,000 3,075,669,000 3,041,682,000 3,010,646,000 2,970,144,000 2,928,753,000 
        less: accumulated depreciation and amortization
                                      1,629,164,000 1,612,337,000 1,578,148,000 1,558,773,000 1,533,404,000 1,509,473,000 1,496,446,000 1,501,130,000 1,465,883,000 1,433,286,000 1,416,227,000 1,388,790,000 1,356,114,000 1,325,858,000 1,322,927,000 1,294,679,000 1,271,082,000 1,248,362,000 1,232,547,000 1,214,604,000 1,196,506,000 1,174,026,000 1,170,845,000 1,146,481,000 1,128,237,000 1,105,930,000 1,098,579,000 1,077,153,000 1,060,961,000 1,061,699,000 1,052,826,000 1,038,437,000 1,021,706,000 1,002,702,000 985,484,000 966,171,000 946,335,000 928,831,000 931,136,000 914,011,000 895,389,000 880,680,000 872,244,000 856,070,000 842,895,000 826,645,000 829,178,000 813,226,000 800,151,000 
        total net utility property
                                      4,418,237,000 4,398,810,000 4,303,164,000 4,227,460,000 4,168,603,000 4,147,500,000 4,056,095,000 3,990,699,000 3,927,577,000 3,898,589,000 3,784,122,000 3,726,700,000 3,651,079,000 3,619,962,000 3,537,974,000 3,282,063,000 3,227,631,000 3,202,425,000 3,157,317,000 3,104,176,000 3,053,488,000 3,023,716,000 2,940,522,000 2,910,318,000 2,872,940,000 2,860,776,000 2,801,519,000 2,764,275,000 2,731,143,000 2,714,237,000 2,675,041,000 2,642,930,000 2,627,978,000 2,607,011,000 2,562,682,000 2,530,937,000 2,503,986,000 2,492,191,000 2,438,917,000 2,398,913,000 2,371,251,000 2,351,342,000 2,305,795,000 2,267,618,000 2,232,774,000 2,215,037,000 2,181,468,000 2,156,918,000 2,128,602,000 
        other non-current assets:
                                                                                       
        investment in affiliated trusts
                                      11,547,000 11,547,000 11,547,000 11,547,000 11,547,000 11,547,000 11,547,000 11,547,000 11,547,000 11,547,000 11,547,000 11,547,000 11,547,000 11,547,000 11,547,000 11,547,000 11,547,000 11,547,000 11,547,000 11,547,000 11,547,000 11,547,000 11,547,000 11,547,000 11,547,000 11,547,000 11,547,000 11,547,000 11,547,000 11,547,000 11,547,000 11,547,000 11,547,000 11,547,000 11,547,000 11,547,000 13,403,000 13,403,000 13,403,000 13,403,000 13,403,000 13,403,000 13,403,000 13,403,000 13,403,000 13,403,000 13,403,000 13,403,000 13,403,000 
        total other non-current assets
                                      160,755,000 153,131,000 149,241,000 148,706,000 145,744,000 141,443,000 135,954,000 148,822,000 142,791,000 143,646,000 140,585,000 143,523,000 146,688,000 151,174,000 152,206,000 100,020,000 225,468,000 240,437,000 254,007,000 256,341,000 249,364,000 248,670,000 249,972,000 252,394,000 263,311,000 212,209,000 186,653,000 191,044,000 203,620,000 195,793,000                    
        deferred charges:
                                                                                       
        regulatory assets for deferred income tax
                                      90,519,000 90,315,000 123,449,000 118,984,000 117,923,000 109,853,000 100,907,000 99,325,000 100,708,000 101,240,000 95,535,000 96,806,000 98,606,000 100,412,000 64,322,000 66,555,000 69,084,000 71,421,000 67,691,000 70,192,000 72,946,000 79,406,000 76,616,000 79,262,000 81,709,000 84,576,000 86,586,000 87,500,000 88,667,000 90,025,000    97,945,000    115,005,000 112,087,000 114,441,000 115,984,000 117,461,000   104,718,000 105,935,000   109,969,000 
        regulatory assets for pensions and other postretirement benefits
                                      206,637,000 209,115,000 230,988,000 234,046,000 237,104,000 240,114,000 223,596,000 226,737,000 229,877,000 235,009,000 226,648,000 229,684,000 232,721,000 235,758,000 151,647,000 153,426,000 155,205,000 156,984,000 292,359,000 297,042,000 301,725,000 306,408,000 248,082,000 252,312,000 256,542,000 260,359,000 185,412,000 190,200,000 176,382,000 178,985,000 134,252,000 136,529,000 138,807,000 141,085,000 163,634,000 166,515,000 169,396,000 172,278,000 48,151,000 48,737,000 49,322,000 51,006,000 52,124,000 52,814,000 53,555,000 54,192,000    
        other regulatory assets
                                      128,813,000 127,328,000 129,112,000 134,533,000 137,366,000 135,751,000 132,131,000 111,488,000 99,142,000 99,798,000 94,124,000 97,690,000 95,618,000 91,920,000 121,760,000 114,253,000 105,807,000 102,915,000 105,608,000 105,737,000 106,291,000 103,946,000 102,998,000 106,905,000 108,492,000 119,738,000 116,093,000 105,525,000 107,107,000 112,830,000 101,268,000 102,301,000 103,572,000 109,825,000 82,163,000 83,932,000 83,927,000 85,112,000 41,215,000 37,917,000 43,371,000 43,004,000 36,927,000 34,518,000 31,578,000 31,752,000 30,997,000 29,940,000 28,489,000 
        regulatory asset for interest rate swaps
                                      151,667,000 169,704,000 170,079,000 168,084,000 155,027,000 161,508,000 246,981,000                                           
        non-current regulatory asset for energy commodity derivatives
                                      9,094,000 18,967,000 16,371,000 15,023,000 15,236,000 16,919,000                                            
        other deferred charges
                                      9,714,000 9,828,000 13,194,000 5,432,000 6,064,000 5,326,000 7,731,000 6,674,000 5,894,000 5,928,000 18,221,000 16,552,000 16,841,000 16,212,000 28,387,000 29,967,000 13,298,000 13,950,000 14,154,000 13,892,000 18,193,000 18,928,000 24,566,000 25,417,000 21,103,000 21,787,000 21,080,000 22,455,000 21,556,000 19,370,000 19,376,000 19,718,000 22,067,000 21,378,000 6,369,000 6,842,000 7,130,000 5,134,000 7,250,000 8,625,000 5,826,000 4,902,000 4,962,000 14,192,000 12,948,000 13,766,000 19,084,000 18,957,000 18,517,000 
        total deferred charges
                                      596,444,000 625,257,000 683,193,000 676,102,000 668,720,000 669,471,000 738,682,000 660,781,000 606,421,000 558,368,000 556,519,000 520,436,000 580,766,000 545,848,000 380,962,000 377,780,000 358,593,000 369,382,000 504,834,000 518,586,000 522,272,000 534,999,000 483,446,000 498,278,000 510,552,000 526,990,000 432,161,000 432,229,000 423,863,000 450,500,000 422,133,000 410,628,000 409,120,000 443,487,000 495,184,000 472,688,000 474,209,000 517,453,000 407,979,000 433,745,000 395,680,000 390,113,000 374,338,000 357,147,000 348,222,000 375,566,000 338,132,000 374,413,000 385,208,000 
        energy commodity derivative liabilities
                                      9,760,000  11,054,000 8,308,000                                           327,997,000 398,472,000 547,720,000 
        income taxes payable
                                      15,845,000            20,335,000  7,581,000 98,314,000                                  
        accrued interest
                                      30,189,000  29,077,000 16,128,000                                              
        accrued taxes other than income taxes
                                      45,102,000  34,520,000 33,169,000                                              
        deferred natural gas costs
                                      31,148,000  34,399,000 28,973,000                                              
        current portion of pensions and other postretirement benefits
                                      10,907,000  11,544,000 11,235,000                                              
        current unsettled interest rate swap derivative liabilities
                                      25,086,000                                                 
        current regulatory liability for excess deferred income taxes
                                      26,242,000                                                 
        regulatory liability for utility plant retirement costs
                                      288,019,000  284,263,000 280,580,000   270,972,000 267,918,000 264,951,000  261,092,000  257,146,000  254,162,000 248,129,000 245,456,000      231,497,000 229,885,000 228,438,000 227,282,000 226,206,000 225,609,000 224,403,000 223,131,000 221,997,000 221,595,000 219,194,000 217,176,000 216,762,000 215,908,000 214,770,000 213,747,000 213,610,000 212,246,000 210,807,000 209,357,000 205,974,000 203,242,000 200,665,000  194,571,000 191,760,000 189,291,000 
        regulatory liability for excess deferred income taxes
                                      413,491,000                                                 
        other non-current liabilities, regulatory liabilities and deferred credits
                                      147,705,000  158,699,000 162,158,000   135,578,000                                           
        income taxes receivable
                                       314,000 42,111,000 35,808,000 34,159,000 48,265,000 49,342,000 25,571,000 12,911,000 24,121,000 627,000 942,000 562,000 43,893,000 8,428,000   7,783,000 12,350,000 131,000 3,556,000 2,777,000 15,907,000 5,548,000  15,378,000 34,376,000 11,266,000 384,000 19,069,000 3,464,000  3,181,000 16,438,000   2,456,000 22,769,000 29,974,000 20,895,000 11,888,000 30,025,000        
        avista corporation
                                                                                       
        current interest rate swap derivative liabilities
                                        34,520,000 36,507,000                                              
        non-current interest rate swap derivative liabilities
                                        1,330,000 336,000   89,683,000                                           
        long-term energy contract receivable
                                            3,790,000 7,502,000 11,136,000 14,694,000 18,179,000 21,590,000                                      
        regulatory asset for utility derivatives
                                            17,936,000 15,194,000 22,830,000 17,260,000 16,841,000 21,464,000 16,058,000 29,640,000 1,724,000   10,829,000 20,399,000 27,876,000 14,577,000 35,082,000 41,251,000 61,479,000 79,232,000 69,685,000 52,784,000 38,269,000 33,966,000 48,891,000 61,245,000 32,822,000 34,355,000 8,330,000 28,441,000 54,268,000 51,268,000 60,229,000 51,151,000   7,171,000 27,713,000 17,977,000  62,650,000 65,496,000   
        investment in exchange power-net
                                            7,146,000 7,758,000 8,371,000 8,983,000 9,596,000 10,208,000 10,821,000 11,433,000 12,046,000 12,658,000 13,271,000 13,883,000 14,496,000 15,108,000 15,721,000 16,333,000 16,946,000 17,558,000 18,171,000 18,783,000 19,396,000 20,008,000 20,621,000 21,233,000 21,846,000 22,458,000 23,071,000 23,683,000  24,908,000 25,521,000 26,133,000 26,746,000 27,358,000 27,971,000 28,583,000 29,196,000 29,808,000 30,421,000 31,033,000 31,646,000 32,258,000 32,871,000 
        non-current regulatory asset for utility commodity derivatives
                                            27,336,000 24,598,000 25,834,000                                         
        utility energy commodity derivative liabilities
                                            8,608,000 7,981,000 10,695,000  15,092,000  14,178,000  5,009,000 3,378,000 3,360,000      35,788,000 55,027,000 73,604,000 70,824,000 53,267,000 40,808,000 37,142,000 51,483,000 65,282,000 44,379,000 44,553,000 16,087,000 37,165,000 56,735,000 55,867,000 71,463,000 64,606,000 21,825,000 8,095,000 19,249,000 37,101,000 28,387,000 14,658,000  75,696,000   
        utility energy commodity derivative assets
                                             1,730,000 127,000 683,000 899,000 484,000 1,579,000 1,525,000 3,334,000 10,869,000 13,925,000 3,022,000 3,430,000 2,250,000 4,706,000 4,139,000 1,678,000 1,345,000 2,282,000 1,139,000 489,000 2,539,000 3,176,000 2,592,000 3,028,000 11,557,000 10,198,000 7,757,000 8,724,000 2,467,000 4,599,000 11,234,000 13,455,000 98,438,000 40,734,000 12,078,000 9,388,000 10,410,000 19,716,000 10,828,000 10,200,000 15,895,000 27,015,000 
        regulatory asset for unsettled interest rate swaps
                                             191,959,000 144,966,000 83,973,000 87,973,000 51,490,000 112,835,000 77,063,000                                    
        other property and investments-net
                                               50,750,000 43,591,000 42,506,000 41,413,000 42,016,000 41,331,000 36,028,000 48,171,000 58,555,000 66,486,000 64,021,000 52,181,000 46,542,000       75,652,000 74,553,000 73,628,000 74,375,000 77,229,000 77,590,000  80,298,000 76,091,000 99,340,000 105,870,000 79,412,000 75,947,000 74,171,000 17,293,000 18,460,000 16,829,000 15,594,000 14,828,000 15,723,000 14,977,000 
        non-current regulatory asset for utility derivatives
                                               32,420,000 34,018,000 28,214,000 24,145,000 24,483,000 13,153,000 13,304,000 11,654,000 23,258,000 24,729,000 31,588,000 22,192,000 25,218,000 30,111,000 33,918,000 40,523,000 40,345,000 16,802,000 6,019,000 2,079,000 15,724,000 38,274,000                   
        current portion of nonrecourse long-term debt of spokane energy
                                                    5,666,000 9,812,000 13,872,000      14,631,000 14,304,000 13,984,000 13,668,000 13,357,000 13,052,000 12,754,000 12,463,000 12,181,000 11,905,000 11,635,000                 
        materials and supplies, fuel stock and natural gas stored
                                                 50,873,000 43,785,000 66,356,000 69,941,000 49,437,000 32,804,000 44,946,000 56,843,000 45,322,000 30,318,000 47,455,000 51,066,000 51,137,000 36,354,000 52,006,000 64,878,000 47,683,000 38,397,000 48,530,000 56,428,000 53,461,000 31,680,000 37,282,000  42,510,000 24,723,000 53,526,000 70,542,000 46,093,000 21,416,000 34,985,000 37,572,000 29,437,000 19,495,000 42,425,000 55,086,000 58,389,000 44,676,000 
        long-term energy contract receivable of spokane energy
                                                  24,931,000 28,202,000 31,405,000 34,541,000 37,612,000 40,619,000 43,563,000 46,446,000 49,269,000 52,033,000 54,740,000 57,390,000 59,985,000 62,525,000 65,013,000 67,450,000 69,835,000 62,525,000 65,013,000 67,450,000 69,834,000                 
        investments and funds held for clients
                                                      95,851,000 96,688,000 92,870,000 92,345,000 103,392,000 88,272,000 114,226,000 129,079,000 164,363,000 118,536,000                        
        intangible assets-net of accumulated amortization of 0 and 36,634, respectively
                                                                                       
        non-current utility energy commodity derivative assets
                                                    1,693,000 275,000 3,545,000 854,000 293,000 135,000 925,000 1,093,000 1,073,000 464,000 2,183,000 185,000 5,595,000 13,064,000 17,789,000 15,261,000 5,751,000 27,998,000 23,983,000 45,483,000 76,600,000 46,873,000 35,322,000 49,313,000 100,927,000 117,322,000 73,136,000 55,313,000 42,531,000 31,960,000 16,418,000 25,575,000 25,286,000 61,405,000 51,431,000 
        client fund obligations
                                                      97,128,000      113,614,000 128,599,000 164,003,000 118,325,000                        
        nonrecourse long-term debt of spokane energy
                                                            21,688,000 25,474,000 29,181,000 32,803,000 36,319,000 39,778,000 43,164,000 46,471,000 49,676,000 52,830,000 55,918,000                 
        long-term borrowings under committed line of credit
                                                      42,000,000      58,000,000 60,000,000 50,000,000                         
        redeemable noncontrolling interests
                                                      15,960,000      6,726,000 53,424,000 57,633,000 51,809,000 52,070,000 52,367,000 42,817,000 46,722,000 43,153,000 37,461,000 39,949,000 34,833,000                
        intangible assets-net of accumulated amortization of 39,410 and 36,634, respectively
                                                      38,610,000                                 
        intangible assets-net of accumulated amortization of 36,634 and 26,030, respectively
                                                       39,576,000                                
        intangible assets-net of accumulated amortization of 33,886 and 26,030, respectively
                                                        41,153,000                               
        intangible assets-net of accumulated amortization of 31,260 and 26,030, respectively
                                                         42,457,000                              
        intangible assets-net of accumulated amortization of 28,322 and 26,030, respectively
                                                          43,884,000                             
        intangible assets-net of accumulated amortization of 26,030 and 16,629, respectively
                                                           46,256,000                            
        other intangibles, property and investments-net
                                                            92,956,000 92,116,000 99,825,000 80,309,000 64,585,000 65,927,000                      
        natural gas deferrals
                                                            13,169,000 16,175,000 15,221,000 12,140,000 8,036,000 13,438,000 15,466,000 22,074,000 25,699,000 25,603,000 30,127,000 39,952,000                
        avista corporation stockholders’ equity:
                                                                                       
        total avista corporation stockholders’ equity
                                                            1,259,744,000 1,216,842,000 1,208,139,000 1,185,701,000 1,170,918,000 1,168,135,000 1,160,379,000 1,125,784,000 1,106,490,000 1,085,867,000 1,063,452,000 1,051,287,000 1,036,162,000 1,033,025,000 1,019,220,000             
        power deferrals
                                                                593,000 7,466,000 10,283,000 18,305,000 29,750,000 28,911,000 24,146,000 27,771,000                
        investments and funds held for customers
                                                                104,521,000                       
        customer fund obligations
                                                                104,521,000 67,104,000 52,908,000 100,543,000 68,014,000 54,836,000 54,232,000 51,648,000 51,881,000 53,358,000 60,957,000 59,095,000 92,429,000 90,574,000 90,190,000 89,885,000 90,259,000 89,752,000 91,506,000  89,955,000 89,043,000  
        58,200,997 and 57,119,723 shares outstanding
                                                                848,709,000                       
        funds held for customers
                                                                 67,104,000 52,908,000 100,543,000 68,014,000 54,836,000 54,232,000 51,648,000 51,881,000 53,358,000 60,957,000 59,095,000 92,429,000 90,574,000 90,190,000 89,885,000 90,259,000 89,752,000 91,506,000 90,134,000 89,955,000 89,043,000  
        current portion of long-term energy contract receivable of spokane energy
                                                                   9,645,000 9,444,000 9,247,000 9,055,000                 
        non-current regulatory liability for utility derivatives
                                                                     3,083,000 1,660,000 42,611,000 74,627,000 38,465,000 25,285,000 42,172,000 93,982,000 115,060,000 72,097,000 53,414,000 36,645,000 27,961,000 11,255,000  12,796,000 54,699,000 51,277,000 
        other property and investments:
                                                                                       
        total other property and investments
                                                                    196,824,000 200,620,000 206,471,000 137,538,000 141,693,000 137,262,000 135,524,000 138,876,000 146,019,000 120,173,000 117,321,000 116,157,000 117,773,000 119,176,000 120,608,000 433,631,000 447,805,000 505,522,000 528,572,000 
        regulatory assets for deferred income taxes
                                                                    93,462,000 95,171,000 96,545,000  98,060,000 99,794,000 101,705,000      112,336,000 103,363,000   106,851,000 108,737,000  
        other non-current liabilities and deferred credits:
                                                                                       
        total other non-current liabilities and deferred credits
                                                                      915,406,000 930,399,000 950,998,000 971,821,000 966,707,000 1,022,659,000 918,989,000 926,291,000 877,489,000 877,290,000 847,565,000 825,409,000 805,813,000  1,105,249,000 1,197,027,000 1,218,615,000 
        as of december 31 dollars in thousands
                                                                       2,009,000                
        restricted cash
                                                                        12,000,000      120,000 4,068,000 1,318,000 3,621,000 26,237,000 29,903,000 26,703,000 40,140,000 23,761,000 
        materials and supplies, fuel stock and natural gas stored.
                                                                        42,019,000               
        investment in exchange power - net
                                                                        24,296,000               
        other property and investments - net
                                                                        81,030,000               
        power cost deferrals
                                                                        37,531,000 38,239,000 44,867,000             
        unamortized debt expense
                                                                        30,827,000 30,493,000 31,862,000 33,004,000 31,491,000 32,383,000 33,627,000 32,542,000 37,972,000 43,275,000 44,895,000 46,554,000 43,800,000 45,627,000 46,682,000 
        liabilities and stockholders’ equity:
                                                                                       
        interest accrued
                                                                        17,223,000 11,249,000 18,942,000 10,871,000 22,188,000 15,638,000 24,281,000 12,578,000 24,794,000 15,455,000 25,468,000  26,318,000 17,963,000 27,419,000 
        other current liabilities.
                                                                        147,269,000               
        stockholders’ equity:
                                                                                       
        total stockholders’ equity
                                                                        1,047,205,000 1,042,532,000 1,030,320,000 996,883,000 978,652,000 965,821,000 939,110,000 913,966,000 912,896,000    818,658,000 818,705,000 806,904,000 
        total liabilities and stockholders’ equity
                                                                        3,557,980,000 3,497,842,000 3,543,702,000 3,630,747,000 3,385,084,000 3,399,869,000 3,322,835,000 3,189,797,000 3,160,122,000    3,949,609,000 4,067,037,000 4,306,437,000 
        power and natural gas deferrals
                                                                           57,607,000 66,858,000 74,320,000 74,414,000 85,885,000 87,486,000 77,025,000 84,110,000 97,792,000 112,114,000 109,747,000 130,120,000 
        deposits from counterparties
                                                                            16,920,000 79,240,000 25,930,000 12,510,000 19,490,000 50,110,000 40,950,000  44,594,000 53,213,000 9,725,000 
        regulatory liability for utility derivatives
                                                                             76,613,000 32,639,000        14,350,000 
        stockholders’ equity: common stock, no par value; 200,000,000 shares authorized; 53,495,520 and 52,909,013 shares outstanding
                                                                             733,583,000          
        53,048,994 and 52,909,013 shares outstanding
                                                                              727,707,000         
        energy commodity derivative assets
                                                                                   343,726,000 360,237,000 416,906,000 579,406,000 
        deposits with counterparties
                                                                                1,265,000 31,064,000 85,366,000 79,477,000 79,246,000 71,013,000 44,131,000 
        non-current energy commodity derivative assets
                                                                                   313,300,000 327,401,000 383,883,000 409,132,000 
        preferred stock-cumulative
                                                                                       
        non-current energy commodity derivative liabilities
                                                                                    325,494,000 378,549,000 398,032,000 
        non-utility properties and investments-net
                                                                                57,881,000 57,505,000 59,955,000 60,301,000 60,527,000 60,255,000 58,189,000 
        current portion of preferred stock-cumulative
                                                                                 26,250,000 26,250,000  26,250,000 1,750,000 1,750,000 
        liabilities and stockholders' equity:
                                                                                       
        stockholders' equity:
                                                                                       
        total stockholders' equity
                                                                                 926,590,000 927,274,000     
        total liabilities and stockholders' equity
                                                                                 3,305,130,000 3,904,629,000     
        52,736,534 and 52,514,326 shares outstanding
                                                                                  717,938,000     
        consolidated balance sheets
                                                                                       
        10,000,000 shares authorized: 6.95 series k 262,500 shares outstanding at december 31, 2005
                                                                                       
        common stock - net, no par value; 200,000,000 shares authorized; 49,143,072 and 48,593,139 shares outstanding
                                                                                    633,206,000   
        10,000,000 shares authorized: 6.95 series k 262,500 shares outstanding
                                                                                     26,250,000 26,250,000 
        common stock - net, no par value; 200,000,000 shares authorized; 49,043,990 and 48,593,139 shares outstanding
                                                                                     630,380,000  
        common stock - net, no par value; 200,000,000 shares authorized; 48,885,732 and 48,593,139 shares outstanding
                                                                                      626,660,000 
      Cashflow Statements:
      Quarterly
      Annual
        Unit: USD2025-09-30 2025-06-30 2025-03-31 2024-09-30 2024-06-30 2024-03-31 2023-06-30 2021-09-30 2021-06-30 2020-09-30 2019-03-31 2017-09-30 2016-09-30 2015-03-31 2012-06-30 2009-06-30 2009-03-31 2006-09-30 
                          
          operating activities:
                          
          net income
        122,000,000 93,000,000 79,000,000 112,840,000 94,353,000 71,495,000 72,329,000 96,457,000 82,091,000 70,753,000 115,881,000 88,317,000 97,213,000 46,462,000 56,745,000 57,709,000 31,419,000 55,104,000 
          non-cash items included in net income:
                          
          depreciation and amortization
        216,000,000 143,000,000 71,000,000 203,650,000 135,761,000 67,930,000 131,367,000 169,239,000 111,487,000 169,851,000 49,123,000 130,803,000 122,414,000 35,379,000 61,647,000 48,835,000 24,285,000 65,466,000 
          benefit from deferred income taxes
                          
          power and natural gas cost (deferrals) amortizations
                          
          amortization of debt expense
        2,000,000 1,000,000 1,000,000 1,578,000 1,039,000 507,000 1,980,000 2,068,000 1,571,000 2,329,000 669,000 2,440,000 2,595,000 895,000  2,842,000 1,411,000 5,792,000 
          stock-based compensation expense
        8,000,000 7,000,000 3,000,000 8,291,000 6,350,000 2,351,000 5,460,000 3,173,000 2,280,000 3,705,000 4,845,000 5,809,000 6,261,000 1,707,000     
          equity-related afudc
        -8,000,000 -5,000,000 -3,000,000 -6,174,000 -3,830,000 -1,753,000 -3,172,000 -5,280,000 -3,346,000 -5,030,000 -1,485,000  -6,306,000 -2,215,000 -1,748,000 -1,232,000 -676,000  
          pension and other postretirement benefit expense
        11,000,000 7,000,000 4,000,000 9,140,000 5,942,000 3,032,000 6,693,000 21,925,000 14,793,000 25,010,000 9,084,000 27,816,000 29,076,000 9,217,000     
          other regulatory assets and liabilities
        32,000,000 30,000,000 22,000,000 -20,973,000 -14,028,000 -9,596,000 -31,997,000            
          other non-current assets and liabilities
                          
          change in decoupling regulatory deferral
        3,000,000 -4,000,000 8,000,000 -22,872,000 -18,752,000 -2,597,000 14,383,000 12,602,000 2,203,000 3,340,000 4,471,000 20,193,000       
          realized and unrealized losses on assets and investments
                          
          other
        1,000,000   -1,513,000 1,831,000 -1,384,000 -2,436,000 -12,697,000 -7,653,000 12,807,000 -1,943,000 -190,000 -15,163,000 -3,077,000 33,348,000 13,189,000 -9,618,000 -17,680,000 
          contributions to defined benefit pension plan
        -10,000,000 -7,000,000 -3,000,000 -10,000,000 -6,666,000 -3,333,000 -6,666,000 -42,000,000 -28,000,000 -22,000,000 -7,300,000 -22,000,000 -12,000,000 -4,000,000 -29,400,000 -32,000,000   
          cash received on settlement of interest rate swap agreements
                          
          changes in certain current assets and liabilities:
                          
          accounts and notes receivable
        42,000,000 28,000,000 -16,000,000 67,697,000 59,468,000 -3,813,000 111,428,000 24,521,000 26,284,000 45,552,000 -9,787,000 52,534,000 53,726,000 2,664,000 55,719,000 93,664,000 5,324,000 347,751,000 
          inventory
        -36,000,000 -24,000,000 -9,000,000 -25,956,000 -15,605,000 -3,725,000 -8,131,000            
          collateral posted for derivative instruments
              116,602,000 -9,944,000 -24,102,000 10,105,000 3,432,000 -1,896,000       
          income taxes receivable
        -5,000,000 -3,000,000 22,000,000 20,132,000 21,242,000 20,506,000 7,476,000 10,663,000 23,869,000 3,549,000  -4,254,000 -25,222,000 43,331,000     
          other current assets
        -16,000,000 -44,000,000 -46,000,000 13,601,000 -81,000 -3,556,000 -20,228,000 7,902,000 2,505,000 6,352,000 1,705,000 -16,000 -8,486,000 471,000 15,694,000 13,426,000 15,606,000 -44,121,000 
          accounts payable
        -18,000,000 -19,000,000 -18,000,000 -33,269,000 -33,884,000 -27,029,000 -96,080,000 -889,000 8,111,000 -23,328,000 16,697,000 -29,992,000 -17,206,000 -30,545,000 -3,456,000 -66,058,000 -31,330,000 -303,562,000 
          other current liabilities
        13,000,000 -13,000,000 31,000,000 17,818,000 -12,809,000 14,547,000 -19,886,000 8,925,000 1,795,000 15,604,000 30,095,000 8,624,000 17,438,000 10,274,000 -6,971,000 4,088,000 10,420,000 60,356,000 
          net cash from operating activities
        394,000,000 224,000,000 184,000,000 444,207,000 316,995,000 190,147,000 269,561,000 228,916,000 190,063,000 282,528,000 196,881,000 307,513,000 254,118,000 146,778,000 199,717,000 176,470,000 91,561,000 171,476,000 
          capital expenditures
          free cash flows
        394,000,000 224,000,000 184,000,000 444,207,000 316,995,000 190,147,000 269,561,000 228,916,000 190,063,000 282,528,000 196,881,000 307,513,000 254,118,000 146,778,000 199,717,000 176,470,000 91,561,000 171,476,000 
          investing activities:
                          
          utility property capital expenditures
        -379,000,000 -246,000,000 -103,000,000 -405,428,000 -251,207,000 -118,709,000 -226,746,000 -322,808,000 -213,827,000 -297,834,000 -93,615,000 -287,853,000 -288,072,000 -81,597,000 -120,476,000 -87,900,000 -41,510,000 -116,591,000 
          issuance of notes receivable
              -1,500,000 -1,791,000 -75,000          
          repayments from notes receivable
        6,000,000                  
          equity and property investments
             -1,776,000 -6,481,000 -12,621,000 -5,650,000 -3,994,000         
          proceeds from sale of investments
               8,306,000 6,806,000 6,644,000         
          net cash from investing activities
        -373,000,000 -248,000,000 -103,000,000 -410,012,000 -254,130,000 -118,100,000 -234,075,000 -326,930,000 -210,839,000 -301,005,000 -97,664,000 -302,351,000 -314,953,000 -80,175,000 -182,509,000 -88,555,000 -45,828,000 -108,079,000 
          financing activities:
                          
          net increase in short-term borrowings
         51,000,000      66,000,000 93,000,000 -35,800,000  75,000,000   30,000,000    
          proceeds from issuance of long-term debt
        140,000,000   83,700,000 83,700,000  250,000,000 70,000,000  165,000,000   70,000,000      
          maturity of long-term debt and finance leases
        -3,000,000 -2,000,000 -1,000,000 -2,550,000 -1,700,000 -850,000 -8,118,000 -2,223,000 -1,491,000 -2,129,000         
          issuance of common stock, net of issuance costs
        45,000,000 35,000,000 16,000,000 35,743,000 17,600,000 115,000 59,525,000 61,345,000 15,689,000 53,356,000 190,000 1,490,000 66,756,000 371,000     
          cash dividends paid
        -119,000,000 -79,000,000 -40,000,000 -112,475,000 -75,090,000 -37,817,000 -69,942,000 -88,204,000 -58,693,000 -82,281,000 -25,615,000 -69,220,000 -65,172,000 -20,717,000 -34,101,000 -21,335,000 -9,845,000 -20,782,000 
          net cash from financing activities
        -7,000,000 3,000,000 -94,000,000 -60,074,000 -83,221,000 -94,776,000 -33,210,000 103,042,000 45,607,000 93,328,000 -97,986,000 1,047,000 57,435,000 -66,665,000 1,546,000 -77,770,000 -34,392,000 -57,714,000 
          net increase in cash and cash equivalents
        14,000,000    -20,356,000  2,276,000 5,028,000 24,831,000 74,851,000 205,000 6,209,000  -62,000 18,754,000 10,145,000 11,341,000 5,683,000 
          cash and cash equivalents at beginning of year
                          
          cash and cash equivalents at end of year
                          
          supplemental cash flow information:
                          
          cash paid during the year for interest
                          
          non-cash financing and investing activities:
                          
          accounts payable for capital expenditures
                      4,381,000    
          deferred income tax provision
        -2,000,000 -5,000,000 -11,000,000 -24,853,000 -23,004,000 -18,971,000             
          power and natural gas cost deferrals
        -41,000,000 -6,000,000 2,000,000 86,408,000 74,643,000 42,701,000 -31,559,000            
          other deferred debits and credits
        49,000,000 33,000,000 20,000,000 25,811,000 22,469,000 18,959,000 32,351,000            
          realized and unrealized losses on assets
        12,000,000 13,000,000 2,000,000 873,000               
          cash received for settlement of interest rate swap agreements
        1,000,000   4,397,000 4,397,000 4,397,000 7,869,000 324,000    2,479,000       
          collateral for derivative instruments
        18,000,000 -1,000,000 25,000,000 17,581,000 18,453,000 21,853,000             
          investments made in equity and property
        -3,000,000 -3,000,000  -7,574,000 -5,115,000              
          net decrease in short-term borrowings
        -67,000,000  -67,000,000 -61,750,000 -105,000,000 -54,000,000 -260,000,000    -71,000,000   -40,000,000     
          cash and cash equivalents at beginning of period
        30,000,000 30,000,000 30,000,000 35,003,000 35,003,000 35,003,000 13,428,000 14,196,000 14,196,000 9,896,000 14,656,000 8,507,000 10,484,000 22,143,000 74,662,000 24,313,000 24,313,000 25,917,000 
          cash and cash equivalents at end of period
        44,000,000 9,000,000 17,000,000 9,124,000 14,647,000 12,274,000 15,704,000 19,224,000 39,027,000 84,747,000 14,861,000 14,716,000 7,084,000 22,081,000 93,416,000 34,458,000 35,654,000 31,600,000 
          net decrease in cash and cash equivalents
         -21,000,000 -13,000,000 -25,879,000  -22,729,000       -3,400,000      
          provision for deferred income taxes
                      6,522,000    
          power and natural gas cost amortizations (deferrals)
               -40,178,000 -21,826,000 -6,470,000 -48,084,000   8,196,000     
          cash paid on settlement of interest rate swap agreements
                          
          cash paid during the year:
                          
          interest
                      36,277,000 28,528,000 7,464,000 58,641,000 
          income taxes paid
                          
          income tax refunds
                          
          cash paid for settlement of interest rate swap agreements
              -409,000 -17,568,000  -33,499,000  -11,302,000 -53,966,000  -18,547,000    
          realized and unrealized loss on assets and investments
            -294,000 -2,374,000 2,752,000            
          realized and unrealized gain on assets and investments
                          
          deferred income tax provision and investment tax credits
              -20,565,000 18,645,000 11,085,000 -2,200,000 8,883,000 58,242,000 87,246,000      
          other regulatory assets and liabilities and deferred debits and credits
               2,597,000 4,008,000 12,456,000 1,016,000 -12,683,000       
          realized and unrealized gains on assets and investments
                          
          materials and supplies, fuel stock and stored natural gas
               -19,753,000 -15,328,000 -2,444,000 -394,000 -12,653,000 -3,932,000      
          cash paid (received) during the year:
                          
          amortization of investment in exchange power
                  613,000 1,838,000 1,838,000 613,000     
          gain on sale of investments
               -1,816,000 -1,764,000 -3,914,000         
          income taxes payable
                  19,360,000  713,000 20,162,000     
          issuance of notes receivable by subsidiaries
                 -4,343,000         
          equity and property investments made by subsidiaries
                  -3,504,000 -10,899,000       
          gain on sale of metalfx
                          
          proceeds from sale of metalfx
                          
          proceeds from sale of investments made by subsidiaries
                          
          avista corporation
                          
          issuance of notes receivable at subsidiaries
                  -200,000 -2,800,000       
          maturity of long-term debt and capital leases
                  -665,000 -2,465,000       
          repayments of notes receivable at subsidiaries
                  261,000        
          distributions received from investments
                  149,000 1,915,000       
          net increase in cash and cash equivalents, including cash classified within current assets held for sale
                  1,231,000        
          less: net increase in cash and cash equivalents classified within current assets held for sale
                  1,026,000        
          amortization of spokane energy contract
                    10,904,000 3,271,000     
          cash paid on settlement of interest rate swap derivatives
                          
          cash received on settlement of interest rate swap derivatives
                          
          repayments from notes receivable at subsidiaries
                          
          power and natural gas cost amortizations
                   8,416,000 11,422,000  8,822,000    
          distributions from investments
                          
          deferred income tax benefit and investment tax credits
                          
          equity-related allowance for funds used during construction
                   -5,012,000       
          other capital expenditures
                    -270,000 -412,000 -2,266,000 -1,640,000 -988,000 -2,852,000 
          investments made by subsidiaries
                          
          gain on sale of ecova
                          
          decoupling regulatory deferral
                    -24,693,000      
          increase in collateral posted for derivative instruments
                    -19,754,000      
          cash paid in acquisition
                          
          net increase in borrowings from committed line of credit
                    82,000,000      
          redemption and maturity of long-term debt
                    -92,375,000 -639,000 -11,264,000 -160,000 -114,000 -39,663,000 
          maturity of nonrecourse long-term debt of spokane energy
                     -1,431,000 -6,694,000    
          repurchase of common stock
                     -2,920,000     
          proceeds from sale of ecova, net of cash sold
                          
          decrease (increase) in collateral posted for derivative instruments
                     -18,516,000     
          federal and state grant payments received
                     943,000     
          cash received (paid) in acquisition
                          
          increase in funds held for clients
                          
          purchase of securities available for sale
                      -64,850,000    
          sale and maturity of securities available for sale
                      71,492,000    
          materials and supplies, fuel stock and natural gas stored
                     22,571,000 869,000 11,016,000 28,803,000 -963,000 
          cash paid for acquisition
                          
          benefit for deferred income taxes
                     -82,000  -8,990,000 -4,859,000 -14,785,000 
          repayment of borrowings from ecova line of credit
                          
          decrease in client fund obligations
                          
          write-off of reardan wind generation capitalized costs
                          
          federal grant payments received
                      4,483,000    
          cash received in acquisition, net of cash paid
                          
          decrease (increase) in funds held for clients
                          
          changes in working capital components:
                          
          cash paid by subsidiaries for acquisitions, net of cash received
                      -50,310,000    
          amortization of debt expense and premium
                      1,926,000    
          borrowings from ecova line of credit
                      25,000,000    
          long-term debt and short-term borrowing issuance costs
                      -130,000 -407,000 -307,000 -779,000 
          issuance of common stock
                      3,575,000 485,000 79,000 7,109,000 
          purchase of subsidiary noncontrolling interest
                      -784,000    
          increase in client fund obligations
                      9,764,000    
          issuance of subsidiary noncontrolling interests
                      3,714,000    
          cash paid during the period:
                          
          income taxes
                      12,217,000 11,986,000 -1,504,000 47,599,000 
          redeemable noncontrolling interests
                      -3,031,000    
          decrease in funds held for clients
                      -16,424,000    
          sale of securities available for sale
                          
          payments for settlements with coeur d’alene tribe
                          
          decrease (increase) in money market funds held for clients
                          
          premiums paid for the redemption of long-term debt
                         -355,000 
          redemption of long-term debt to affiliated trusts
                       -61,856,000   
          cash received (paid) for settlement of interest rate swap agreements
                          
          utility property acquired under capital leases
                          
          contingent consideration by subsidiary for acquisition
                          
          cash paid by subsidiary for acquisition, net of cash received
                          
          decrease (increase) in funds held for customers
                       5,737,000   
          increase in customer fund obligations
                       -5,737,000 1,862,000  
          borrowings from advantage iq line of credit
                          
          repayment of borrowings from advantage iq line of credit
                          
          net income.
                          
          deposits from counterparties
                         30,870,000 
          decrease in restricted cash
                          
          proceeds from asset sales
                          
          other.
                          
          cash received (paid) in interest rate swap agreements
                          
          contingent consideration by subsidiary for acquisition.
                          
          issuance of stock by subsidiary for acquisition
                          
          increase in restricted cash
                         -1,069,000 
          maturity of long-term debt
                          
          cash received from interest rate swap agreement
                          
          equity transactions of consolidated subsidiaries
                       40,000 33,000  
          redemption and maturity of nonrecourse long-term debt of spokane energy
                          
          increase in funds held for customers
                        -1,862,000  
          cash paid (received) during the period:
                          
          non-cash financing and investing activities
                          
          power and natural gas cost amortizations, net of deferrals
                       39,981,000 20,776,000 40,580,000 
          regulatory disallowance of unamortized debt repurchase costs
                          
          unrealized loss on energy commodity derivatives
                          
          loss on sale of avista energy assets
                          
          deposits with counterparties
                         -19,892,000 
          purchase of auction rate investment securities
                          
          sale of auction rate investment securities
                          
          decrease in funds held for customers
                          
          for the years ended december 31 dollars in thousands
                          
          redemption of preferred stock
                         -1,750,000 
          decrease in customer fund obligations
                          
          decrease (increase) in restricted cash
                          
          repayments received on notes receivable
                          
          purchase of subsidiary minority interest
                       -4,775,000   
          increase in short-term borrowings
                       11,200,000 -26,100,000 -1,494,000 
          cash received (paid) in interest rate swap agreement
                          
          liability to subsidiary minority shareholders
                          
          balance as of january 1, 2009
                          
          equity compensation expense
                          
          other comprehensive income
                          
          balance as of september 30, 2009
                          
          balance as of january 1, 2008
                          
          balance as of september 30, 2008
                          
          cash paid in interest rate swap agreement
                          
          write-offs and impairments of assets
                          
          unrealized gain on energy commodity derivatives
                          
          payments for settlement of water storage on coeur d’alene tribe land
                          
          proceeds from sale of utility property claim
                         5,484,000 
          common stock issued to settle incentive compensation liability
                          
          impairment of utility generation asset
                          
          cash paid for acquisition of subsidiary, net of cash received
                          
          proceeds received from sale of assets
                          
          changes in other property and investments
                         -1,016,000 
          change in liability to subsidiary minority shareholders
                          
          issuance of subsidiary stock for acquisition of subsidiary
                          
          •
                          
          gain on sale of utility properties
                          
          decrease in short-term borrowings
                          
          equity issued by consolidated subsidiaries
                          
          other equity transactions of consolidated subsidiaries
                          
          proceeds from property sales
                         7,965,000 
          cumulative effect of accounting change
                          
          purchases of securities held for trading
                          
          sales of securities held for trading
                          
          energy commodity assets and liabilities
                         -1,440,000 
          sale of customer accounts receivable under revolving agreement-net
                         -32,000,000 
          deposit for utility property acquisition
                          
          consolidated statements of cash flows
                          
          increase in cash and cash equivalents
                          
          distribution to minority interests