7Baggers

Atmos Energy Corporation
(NYSE:ATO) 

ATO stock logo

Atmos Energy Corporation, together with its subsidiaries, engages in the regulated natural gas distribution, and pipeline and storage businesses in the United States. It operates in two segments, Distribution, and Pipeline and Storage. The Distribution segment is involved in the regulated natural ga...

Founded: 1906
Full Time Employees: 4,694
Sector: Utilities
Industry: Utilities-Regulated Gas

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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 2005-12-31 2005-09-30 2005-06-30 2005-03-31 2004-12-31 2004-09-30 2004-06-30 2004-03-31 2003-12-31 
                                                                                              
      operating revenues
                                                                                              
      distribution segment
    1,877,680,000 1,258,826,000 666,402,000 767,132,000 1,882,528,000 1,109,335,000 587,411,000 633,211,000 1,589,181,000 1,105,338,000 542,987,000 616,067,000 1,500,210,000 1,440,426,000 678,915,000 773,311,000 1,610,546,000 972,422,000 523,899,000 558,750,000 1,282,674,000 876,650,000 430,176,000 435,308,000 933,005,000 828,504,000 403,793,000 444,944,000 1,896,724,000 838,835,000 407,476,000 535,488,000 1,199,291,000 860,792,000 437,918,000 494,060,000 962,541,000 754,656,000                                                     
      pipeline and storage segment
    289,289,000 286,633,000 278,523,000 272,388,000 258,999,000 255,390,000 252,693,000 250,680,000 223,487,000 211,169,000 205,896,000 208,225,000 184,424,000 186,629,000 183,583,000 183,412,000 163,747,000 162,918,000 160,479,000 162,987,000 154,168,000 159,713,000 156,918,000 158,008,000 146,237,000 148,176,000 147,706,000 149,198,000 270,120,000 134,470,000 132,662,000 127,633,000 120,955,000 126,463,000 117,823,000 117,283,000 111,972,000 109,952,000                                     36,787,750 37,937,000 59,362,000 49,852,000 39,510,000 35,862,000 45,483,000 39,712,000 33,944,000 36,524,000 45,546,000 43,690,000     
      intersegment eliminations
    -204,567,000 -202,874,000 -207,445,000 -200,746,000 -191,025,000 -188,726,000 -182,160,000 -182,342,000 -165,441,000 -158,040,000 -161,241,000 -161,559,000 -143,661,000 -143,046,000 -139,870,000 -140,294,000 -124,474,000 -122,554,000 -115,994,000 -116,184,000 -117,769,000 -121,883,000 -112,180,000 -100,321,000 -101,577,000 -101,117,000 -107,816,000 -108,404,000 -194,417,000 -95,523,000 -95,438,000 -100,876,000 -100,837,000 -98,063,000 -90,861,000 -84,842,000 -86,327,000 -84,440,000 -111,927,000 -105,114,000 -100,490,000 -99,582,000 -103,391,000 -106,170,000 -120,597,000 -133,862,000 -113,455,000 -127,211,000 -157,936,000 -107,779,000 -95,606,000 -105,058,000 -86,976,000 -93,207,000 -75,546,000 -62,543,000 -74,358,000 -93,054,000 -90,953,000 -108,271,000 -134,424,000 -94,847,000 -107,924,000 -109,573,000 -182,105,000 -112,796,000 -99,390,000 -117,285,000 -189,178,000 -198,261,000 -280,788,000 -277,382,000 -227,986,000 -163,157,000 -220,100,000 -223,046,000 -240,637,000 -124,510,000 -138,974,000 -138,523,000 -279,481,000 -264,239,000 -115,659,000 -96,563,000 -110,007,000 -83,907,000 -85,703,000 -80,743,000 -118,669,000 -74,329,000 
      total operating revenues
    1,962,402,000 1,342,585,000 737,480,000 838,774,000 1,950,502,000 1,175,999,000 657,944,000 701,549,000 1,647,227,000 1,158,467,000 587,642,000 662,733,000 1,540,973,000 1,484,009,000 722,628,000 816,429,000 1,649,819,000 1,012,786,000 568,384,000 605,553,000 1,319,073,000 914,480,000 474,914,000 492,995,000 977,665,000 875,563,000 443,683,000 485,738,000 1,972,427,000 877,782,000 444,700,000 562,245,000 1,219,409,000 889,192,000 464,880,000 526,501,000 988,186,000                                                      
      yoy
    0.61% 14.17% 12.09% 19.56% 18.41% 1.51% 11.96% 5.86% 6.90% -21.94% -18.68% -18.83% -6.60% 46.53% 27.14% 34.82% 25.07% 10.75% 19.68% 22.83% 34.92% 4.44% 7.04% 1.49% -50.43% -0.25% -0.23% -13.61% 61.75% -1.28% -4.34% 6.79% 23.40%                                                          
      qoq
    46.17% 82.05% -12.08% -57.00% 65.86% 78.74% -6.22% -57.41% 42.19% 97.14% -11.33% -56.99% 3.84% 105.36% -11.49% -50.51% 62.90% 78.19% -6.14% -54.09% 44.24% 92.56% -3.67% -49.57% 11.66% 97.34% -8.66% -75.37% 124.71% 97.39% -20.91% -53.89% 37.14% 91.27% -11.70% -46.72%                                                       
      purchased gas cost
                                                                                              
      total purchased gas cost
    667,318,000 295,999,000 -1,067,000 53,840,000 779,233,000 234,048,000 -26,878,000 -2,593,000 624,295,000 338,869,000 3,163,000 44,550,000 666,211,000 738,249,000 190,956,000 249,159,000 871,378,000 371,163,000 83,778,000 86,870,000 573,809,000 288,260,000 18,031,000 26,072,000 317,883,000 296,868,000 13,670,000 31,326,000 813,841,000 342,165,000 43,085,000 130,886,000 626,960,000 366,917,000 72,561,000 114,176,000 427,494,000                                                      
      operation and maintenance expense
    195,790,000 229,810,000 240,502,000 222,100,000 233,296,000 207,044,000 241,584,000 211,309,000 199,899,000 166,345,000 190,125,000 195,049,000 194,716,000 185,016,000 205,374,000 182,325,000 163,352,000 159,110,000 199,531,000 184,470,000 156,375,000 138,643,000 180,072,000 149,460,000 147,824,000 152,245,000 177,736,000 164,545,000 288,027,000 138,600,000 163,880,000 145,075,000 161,073,000 129,567,000 160,931,000 128,690,000 132,239,000                                                      
      depreciation and amortization expense
    195,687,000 194,645,000 185,676,000 185,786,000 182,750,000 180,533,000 173,450,000 166,827,000 165,087,000 164,608,000 159,264,000 150,726,000 148,317,000 146,020,000 140,194,000 134,231,000 133,374,000 127,856,000 124,708,000 119,348,000 118,636,000 115,285,000 111,746,000 107,104,000 105,916,000 105,062,000 100,919,000 97,700,000 192,837,000 96,065,000 92,657,000 90,671,000 89,381,000 88,374,000 84,800,000 80,023,000 77,667,000                                                      
      taxes, other than income
    138,803,000 107,367,000 92,884,000 124,981,000 126,284,000 94,894,000 84,788,000 105,739,000 106,956,000 89,540,000 81,020,000 103,155,000 109,091,000 93,538,000 80,702,000 96,127,000 96,583,000 78,796,000 69,403,000 81,475,000 88,449,000 73,452,000 64,220,000 71,324,000 74,604,000 68,607,000 61,643,000 69,965,000 143,581,000 64,488,000 55,486,000 72,620,000 73,007,000 62,773,000 54,796,000 62,948,000 65,614,000 57,049,000 50,144,000 59,244,000 62,157,000 51,471,000 50,352,000 63,175,000 69,046,000 49,385,000 46,296,000 63,414,000 60,215,000 42,011,000 40,717,000 50,714,000 54,307,000 41,334,000 36,069,000 46,887,000 54,919,000 43,198,000 32,815,000 52,142,000 54,103,000 40,696,000 35,859,000 52,483,000 59,613,000 42,552,000 32,672,000 47,577,000 58,314,000 44,137,000 39,585,000 57,335,000 54,408,000 41,427,000 33,172,000 52,881,000 56,746,000 40,067,000 33,302,000 48,479,000 64,796,000 45,416,000 34,159,000 46,915,000 54,967,000 38,655,000 11,478,000 12,297,000 18,481,000 15,123,000 
      operating income
    764,804,000 514,764,000 219,485,000 252,067,000 628,939,000 459,480,000 185,000,000 220,267,000 550,990,000 399,105,000 154,070,000 169,253,000 422,638,000 321,186,000 105,402,000 154,587,000 385,132,000 275,861,000 90,964,000 133,390,000 381,804,000 298,840,000 100,845,000 139,035,000 331,438,000 252,781,000 89,715,000 122,202,000 534,141,000 236,464,000 89,592,000 122,993,000 268,988,000 241,561,000 91,792,000 140,664,000 285,172,000 209,918,000 84,633,000 137,164,000 250,016,000 196,205,000 75,853,000 117,607,000 250,210,000 187,725,000 83,944,000 106,605,000 250,080,000 170,720,000 50,383,000 86,396,000 210,178,000 154,922,000 8,682,000 84,789,000 208,362,000 144,407,000 41,333,000 34,078,000 217,922,000 160,109,000 40,191,000 34,109,000 224,540,000 190,596,000 13,978,000 43,683,000 226,547,000 163,194,000 37,534,000 20,709,000 211,143,000 158,509,000 10,733,000 7,731,000 209,012,000 171,160,000 47,283,000 4,803,000 180,833,000 149,697,000 8,332,000 39,468,000 172,181,000 128,674,000 3,280,000 21,460,000 105,414,000 63,541,000 
      yoy
    21.60% 12.03% 18.64% 14.44% 14.15% 15.13% 20.08% 30.14% 30.37% 24.26% 46.17% 9.49% 9.74% 16.43% 15.87% 15.89% 0.87% -7.69% -9.80% -4.06% 15.20% 18.22% 12.41% 13.77% -37.95% 6.90% 0.14% -0.64% 98.57% -2.11% -2.40% -12.56% -5.68% 15.07% 8.46% 2.55% 14.06% 6.99% 11.58% 16.63% -0.08% 4.52% -9.64% 10.32% 0.05% 9.96% 66.61% 23.39% 18.98% 10.20% 480.32% 1.90% 0.87% 7.28% -78.99% 148.81% -4.39% -9.81% 2.84% -0.09% -2.95% -16.00% 187.53% -21.92% -0.89% 16.79% -62.76% 110.94% 7.30% 2.96% 249.71% 167.87% 1.02% -7.39% -77.30% 60.96% 15.58% 14.34% 467.49% -87.83% 5.02% 16.34% 154.02% 83.91% 63.34% 102.51%     
      qoq
    48.57% 134.53% -12.93% -59.92% 36.88% 148.37% -16.01% -60.02% 38.06% 159.04% -8.97% -59.95% 31.59% 204.72% -31.82% -59.86% 39.61% 203.26% -31.81% -65.06% 27.76% 196.34% -27.47% -58.05% 31.12% 181.76% -26.58% -77.12% 125.89% 163.93% -27.16% -54.28% 11.35% 163.16% -34.74% -50.67% 35.85% 148.03% -38.30% -45.14% 27.43% 158.66% -35.50% -53.00% 33.29% 123.63% -21.26% -57.37% 46.49% 238.84% -41.68% -58.89% 35.67% 1684.40% -89.76% -59.31% 44.29% 249.37% 21.29% -84.36% 36.11% 298.37% 17.83% -84.81% 17.81% 1263.54% -68.00% -80.72% 38.82% 334.79% 81.24% -90.19% 33.21% 1376.84% 38.83% -96.30% 22.11% 261.99% 884.45% -97.34% 20.80% 1696.65% -78.89% -77.08% 33.81% 3822.99% -84.72% -79.64% 65.90%  
      operating margin %
    38.97% 38.34% 29.76% 30.05% 32.24% 39.07% 28.12% 31.40% 33.45% 34.45% 26.22% 25.54% 27.43% 21.64% 14.59% 18.93% 23.34% 27.24% 16.00% 22.03% 28.94% 32.68% 21.23% 28.20% 33.90% 28.87% 20.22% 25.16% 27.08% 26.94% 20.15% 21.88% 22.06% 27.17% 19.75% 26.72% 28.86% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% 
      other non-operating income
    17,516,000 22,231,000 20,835,000 20,100,000 24,172,000 24,634,000 16,575,000 19,898,000 16,687,000 17,886,000 15,008,000 16,170,000 17,406,000 21,191,000 6,559,000 13,263,000 5,213,000 8,702,000 -16,938,000 5,887,000 2,834,000 6,072,000 -1,962,000 7,235,000 -2,989,000 4,887,000  1,645,000                                                               
      interest charges
    48,731,000 33,413,000 27,202,000 41,537,000 50,014,000 52,925,000 42,155,000 41,160,000 55,442,000 51,875,000 31,817,000 31,334,000 37,370,000 36,760,000 27,842,000 26,190,000 28,928,000 19,851,000 14,486,000 20,962,000 26,096,000 22,010,000 15,494,000 19,580,000 22,171,000 27,229,000 28,763,000 19,592,000 54,798,000 27,849,000 24,484,000 23,349,000 27,304,000 31,509,000 33,710,000 28,498,000 26,944,000 31,030,000 30,207,000 27,698,000 27,560,000 30,483,000 31,075,000 27,955,000 27,447,000 29,764,000 33,739,000 31,840,000 31,601,000 32,115,000 31,791,000 32,741,000 33,331,000 30,522,000 34,149,000 34,923,000 36,660,000 35,442,000 38,210,000 35,845,000 37,892,000 38,917,000 38,891,000 37,290,000 39,582,000 38,708,000 36,795,000 41,511,000 35,533,000 38,991,000 34,119,000 33,470,000 33,516,000 36,817,000 35,963,000 34,479,000 35,262,000 39,532,000 38,982,000 35,944,000 35,492,000 36,189,000 33,354,000 33,689,000 33,073,000 32,542,000 15,931,000 16,011,000 16,160,000 17,335,000 
      income before income taxes
    733,589,000 503,582,000 213,118,000 230,630,000 603,097,000 431,189,000 159,420,000 199,005,000 512,235,000 365,116,000 137,261,000 154,089,000 402,674,000 305,617,000 84,119,000 141,660,000 361,417,000 264,712,000 59,540,000 118,315,000 358,542,000 282,902,000 83,389,000 126,690,000 306,278,000 230,439,000 145,026,750 104,255,000 475,852,000 200,892,000  97,641,000       53,894,000 110,299,000 221,771,000 164,513,000 116,935,500 90,286,000 221,202,000 156,254,000               206,217,000 120,455,000 2,031,000 -4,031,000 185,007,000 151,619,000 -25,473,000 3,391,000 189,449,000 123,902,000 3,172,000 -11,161,000 179,094,000 121,599,000 -23,729,000 -22,482,000 175,588,000 133,207,000 10,210,000 -30,178,000 142,902,000 113,956,000 60,971,500 7,303,000 140,066,000 96,517,000  7,636,000  47,413,000 
      income tax expense
    151,690,000 100,618,000 38,227,000 44,201,000 117,521,000 79,331,000 25,404,000 33,441,000 80,212,000 53,824,000 18,737,000 16,282,000 45,003,000 33,757,000 12,476,000 13,113,000 36,418,000 15,503,000 10,820,000 15,904,000 61,788,000 65,224,000 18,056,000 8,899,000 66,632,000 51,766,000 11,796,000 23,789,000 103,318,000 43,246,000 25,308,000 26,448,000 62,439,000 -106,115,000 19,409,000 41,069,000 97,049,000 63,856,000 19,654,000 39,106,000 79,961,000 61,652,000 19,508,000 34,005,000 83,518,000 58,659,000 25,279,000 28,670,000 83,596,000 49,457,000 8,916,000 19,714,000 66,219,000 47,750,000 -27,258,000 17,774,000 66,408,000 41,302,000 -522,000  74,008,000 46,458,000 494,000  70,881,000 58,289,000 -9,521,000 1,427,000 60,446,000 47,939,000 1,590,000  67,560,000 47,796,000 -17,815,000  69,083,000 51,946,000 4,151,000 -12,033,000 54,106,000 42,929,000 -9,066,000 2,817,000 51,564,000 36,918,000 -4,610,000 2,871,000 35,405,000 17,872,000 
      net income
    581,899,000 402,964,000 174,891,000 186,429,000 485,576,000 351,858,000 134,016,000 165,564,000 432,023,000 311,292,000 118,524,000 137,807,000 357,671,000 271,860,000 71,643,000 128,547,000 324,999,000 249,209,000 48,720,000 102,411,000 296,754,000 217,678,000 65,333,000 117,791,000 239,646,000 178,673,000 58,406,000 80,466,000 372,534,000 157,646,000 38,747,000 71,193,000 178,992,000 314,132,000 35,853,000 70,808,000 164,728,000 125,032,000 34,240,000 71,193,000 141,810,000 102,861,000 23,515,000 56,281,000 137,684,000 97,595,000 23,713,000 45,721,000 133,367,000 87,016,000 7,536,000 38,768,000 116,425,000 80,465,000 7,967,000 31,132,000 109,111,000 68,507,000 1,961,000 -566,000 132,209,000 73,997,000 1,537,000 -3,154,000 114,126,000 93,330,000 -15,952,000 1,964,000 129,003,000 75,963,000 1,582,000 -6,588,000 111,534,000 73,803,000 -5,914,000 -13,360,000 106,505,000 81,261,000 6,059,000 -18,145,000 88,796,000          
      yoy
    19.84% 14.52% 30.50% 12.60% 12.40% 13.03% 13.07% 20.14% 20.79% 14.50% 65.44% 7.20% 10.05% 9.09% 47.05% 25.52% 9.52% 14.49% -25.43% -13.06% 23.83% 21.83% 11.86% 46.39% -35.67% 13.34% 50.74% 13.03% 108.13% -49.82% 8.07% 0.54% 8.66% 151.24% 4.71% -0.54% 16.16% 21.55% 45.61% 26.50% 3.00% 5.40% -0.83% 23.10% 3.24% 12.16% 214.66% 17.93% 14.55% 8.14% -5.41% 24.53% 6.70% 17.46% 306.27% -5600.35% -17.47% -7.42% 27.59% -82.05% 15.84% -20.71% -109.64% -260.59% -11.53% 22.86% -1108.34% -129.81% 15.66% 2.93% -126.75% -50.69% 4.72% -9.18% -197.61% -26.37% 19.94%              
      qoq
    44.40% 130.41% -6.19% -61.61% 38.00% 162.55% -19.05% -61.68% 38.78% 162.64% -13.99% -61.47% 31.56% 279.46% -44.27% -60.45% 30.41% 411.51% -52.43% -65.49% 36.33% 233.18% -44.53% -50.85% 34.13% 205.92% -27.42% -78.40% 136.31% 306.86% -45.57% -60.23% -43.02% 776.17% -49.37% -57.02% 31.75% 265.16% -51.91% -49.80% 37.87% 337.43% -58.22% -59.12% 41.08% 311.57% -48.14% -65.72% 53.27% 1054.67% -80.56% -66.70% 44.69% 909.98% -74.41% -71.47% 59.27% 3393.47% -446.47% -100.43% 78.67% 4714.38% -148.73% -102.76% 22.28% -685.07% -912.22% -98.48% 69.82% 4701.71% -124.01% -105.91% 51.12% -1347.94% -55.73% -112.54% 31.07% 1241.16% -133.39% -120.43%           
      net income margin %
    29.65% 30.01% 23.71% 22.23% 24.89% 29.92% 20.37% 23.60% 26.23% 26.87% 20.17% 20.79% 23.21% 18.32% 9.91% 15.75% 19.70% 24.61% 8.57% 16.91% 22.50% 23.80% 13.76% 23.89% 24.51% 20.41% 13.16% 16.57% 18.89% 17.96% 8.71% 12.66% 14.68% 35.33% 7.71% 13.45% 16.67% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% -Infinity% Infinity% Infinity% Infinity% -Infinity% Infinity% Infinity% -Infinity% Infinity% Infinity% Infinity% Infinity% -Infinity% Infinity% Infinity% -Infinity% -Infinity% Infinity% Infinity% Infinity% -Infinity% Infinity% NaN% NaN% NaN% NaN% NaN% NaN% NaN% NaN% NaN% 
      basic net income per share
    3.49 2.48 1.07 1.17 3.05 2.25 0.83 1.08 2.85 2.08 0.77 0.94 2.48 1.92 0.48 0.92 2.37 1.86 0.35 0.78 2.3 1.71 0.51 0.96 1.95 1.47 0.973 0.68 3.22 1.38             0.715 0.55 1.35 0.96               1.45 0.81 0.03 -0.03 1.22 -0.18 0.02 1.42 0.84 0.02  1.25 0.83 -0.08  1.21 0.98 0.07 -0.22 1.1 0.88 0.49 0.06 1.12 0.79    0.57 
      diluted net income per share
    3.47 2.44 1.06 1.16 3.03 2.23 0.83 1.08 2.85 2.08 0.77 0.94 2.48 1.91 0.48 0.92 2.37 1.86 0.35 0.78 2.3 1.71 0.52 0.96 1.95 1.47 0.97 0.68 3.21 1.38             0.715 0.55 1.35 0.96               1.45 0.81 0.02 -0.03 1.22 -0.18 0.02 1.41 0.83 0.01  1.24 0.82 -0.08  1.2 0.97 0.07 -0.22 1.1 0.88 0.485 0.06 1.11 0.79    0.57 
      cash dividends per share
    0.653 0.87 0.87 0.87 0.604 0.805 0.805 0.805 0.555 0.74 0.74 0.74 0.51 0.68 0.68 0.68 0.469 0.625 0.625 0.625 0.431 0.575 0.575 0.575 0.394 0.525 1.05 0.525 0.364 0.485 0.485 0.485 0.338 0.45 0.45 0.45 0.315 0.42 0.42 0.42 0.293 0.39 0.39 0.39 0.278 0.37 0.37 0.37 0.263 0.35 0.35 0.35 0.259 0.345 0.345 0.345 0.255 0.34 0.34 0.34 0.251 0.335 0.335 0.335 0.248 0.33 0.33 0.33 0.244 0.325 0.325 0.325 0.24 0.32 0.32 0.32 0.236 0.315 0.315 0.315 0.233 0.31 0.31 0.31 0.229 0.305 0.305 0.305 
      basic weighted-average shares outstanding
    166,464 162,727  159,285 159,177 156,301  153,309 151,271 149,796  146,051 143,941 141,820  139,881 136,834 133,682  131,358 129,161 127,034  123,026 122,916 121,113  118,075 115,690 113,800                                                             
      diluted weighted-average shares outstanding
    167,812 164,871  161,171 160,426 157,824  153,396 151,297 149,796  146,067 143,987 141,937  140,227 137,250 133,689  131,486 129,164 127,034  123,032 122,997 121,359  118,430 115,794 113,832                                                             
      other comprehensive income, net of tax
                                                                                              
      net unrealized holding gains on available-for-sale securities, net of tax of (45) and 20
    -158                                                                                          
      cash flow hedges:
                                                                                              
      amortization and unrealized losses on interest rate agreements, net of tax of
    -4,780                                                                                          
      total other comprehensive loss
    -4,938                   -79,232   -536       -22,258                                                             
      total comprehensive income
    576,961 398,159 171,946 187,838 479,989 368,281 89,599 179,996 459,131 261,356 232,649 181,213 327,338 294,078 135,545 288,178 446,722 203,262 57,284 23,179 434,693 277,799 124,471 113,705 240,536 179,725 59,486 81,613 347,581 135,388                                                             
      net unrealized holding gains on available-for-sale securities, net of tax of 0 and
                                                                                             
      amortization and unrealized gains on interest rate agreements, net of tax of (1,338) and 3,492
     -4,806                                                                                         
      total other comprehensive income
     -4,805 -2,945 1,409 -5,587 16,423 -44,417 14,432 27,108 -49,936 114,125 43,406 -30,333 22,218 63,902 159,631 121,723 -45,947 8,564  137,939 60,121  -4,086 890 1,052 1,080 1,147 -24,953                                                              
      net unrealized holding gains on available-for-sale securities, net of tax of 9 and
       31                                                                                       
      amortization and unrealized gains on interest rate agreements, net of tax of 394 and 4,173
       1,378                                                                                       
      net unrealized holding gains on available-for-sale securities, net of tax of 20 and
        73                                                                                      
      amortization and unrealized gains on interest rate agreements, net of tax of (1,622) and 7,850
        -5,660                                                                                      
      net unrealized holding gains on available-for-sale securities, net of tax of (42) and 86
         -138                                                                                     
      amortization and unrealized gains on interest rate agreements, net of tax of 3,492 and
         16,561                                                                                     
      net unrealized holding losses on available-for-sale securities, net of tax of
           -4                                                                                   
      amortization and unrealized gains on interest rate agreements, net of tax of 4,173 and 12,580
           14,436                                                                                   
      net unrealized holding gains on available-for-sale securities, net of tax of (15) and 39
            -50                                                                                  
      amortization and unrealized gains on interest rate agreements, net of tax of 7,850 and
            27,158                                                                                  
      net unrealized holding gains on available-for-sale securities, net of tax of 86 and 25
             296                                                                                 
      amortization and unrealized gains on interest rate agreements, net of tax of (14,519) and 6,397
             -50,232                                                                                 
      net unrealized holding losses on available-for-sale securities, net of tax of 35 and 31
               -121                                                                               
      amortization and unrealized gains on interest rate agreements, net of tax of 12,580 and 46,168
               43,527                                                                               
      net unrealized holding gains on available-for-sale securities, net of tax of 39 and
                134                                                                              
      amortization and unrealized gains on interest rate agreements, net of tax of (8,806) and 35,228
                -30,467                                                                              
      net unrealized holding gains on available-for-sale securities, net of tax of 25 and
                 87                                                                             
      amortization and unrealized gains on interest rate agreements, net of tax of 6,397 and
                 22,131                                                                             
      net unrealized holding losses on available-for-sale securities, net of tax of 31 and 11
                   -106                                                                           
      amortization and unrealized gain on interest rate agreements, net of tax of 46,168 and
                   159,737                                                                           
      net unrealized holding losses on available-for-sale securities, net of tax of 47 and 19
                    -161                                                                          
      amortization and unrealized gain on interest rate agreements, net of tax of 35,228 and 39,887
                    121,884                                                                          
      net unrealized holding losses on available-for-sale securities, net of tax of 20 and 18
                     -69                                                                         
      amortization and unrealized gain on interest rate agreements, net of tax of (13,260) and 17,395
                     -45,878                                                                         
      net unrealized holding gains on available-for-sale securities, net of tax of (11) and 96
                       -36                                                                       
      amortization and unrealized loss on interest rate agreements, net of tax of
                       -79,196   -586                                                                    
      net unrealized holding losses on available-for-sale securities, net of tax of 19 and 49
                        -66                                                                      
      amortization and unrealized gain on interest rate agreements, net of tax of 39,887 and 312
                        138,005                                                                      
      net unrealized holding losses on available-for-sale securities, net of tax of (18) and 0
                         -63                                                                     
      amortization and unrealized gain on interest rate agreements, net of tax of 17,395 and 311
                         60,184                                                                     
      net unrealized holding gains on available-for-sale securities, net of tax of 96 and 27
                           364                                                                   
      amortization and unrealized gain on interest rate agreements, net of tax of (1,115) and 312
                           -4,450                                                                   
      net unrealized holding gains on available-for-sale securities, net of tax of (49) and 29
                            -163                                                                  
      amortization and unrealized loss on interest rate agreements, net of tax of 312 and
                            1,053                                                                  
      net unrealized holding losses on available-for-sale securities, net of tax of 0 and 0
                             -1                                                                 
      amortization and unrealized loss on interest rate agreements, net of tax of 311 and
                             1,053                                                                 
      net unrealized holding gains on available-for-sale securities, net of tax of 27 and 92
                               94                                                               
      amortization and unrealized gain on interest rate agreements, net of tax of 312 and 2,460
                               1,053                                                               
      other non-operating expense
                              -461,500  -3,491,000 -7,723,000                                                             
      net unrealized holding gains on available-for-sale securities, net of tax of 29 and
              25                  97                                                              
      amortization and unrealized gain on interest rate agreements, net of tax of (7,405) and 6,026
                                -25,050                                                              
      net unrealized holding losses on available-for-sale securities, net of tax of 0 and 62
                                                                                              
      amortization and unrealized loss on interest rate agreements, net of tax of 6,580 and 549
                                 -22,258                                                             
      miscellaneous expense
                                  -1,053,000 -2,003,000  -2,035,000 -2,820,000   -994,000 -532,000  -685,000 -1,209,000 -1,755,000  -1,561,000 -1,707,000  -374,000    -467,000    -1,948,000  -1,875,000  -1,430,000  -737,000 -267,500   -269,000    -301,000                     
      basic and diluted net income per share
                                   0.64       0.765 0.69 1.38                                                 
      basic and diluted weighted-average shares outstanding
                                  111,012 111,851 111,706 108,564 106,100 106,364 105,935 105,284  103,750 102,946 102,713                                                 
      miscellaneous income
                                    -253,000   -289,000 833,000   833,000    634,000   -1,005,500  -1,516,000 -2,132,000 -2,140,000  1,712,000 698,000 -11,437,000  616,000  -2,547,000  26,187,000   -850,000 49,000  -2,656,000 1,219,000 -1,565,000  -243,000 1,600,000 1,467,000 -93,000 1,501,000 4,266,000 1,838,000 1,579,000 1,909,000 963,000 -2,439,000 448,000 -846,000 1,524,000 958,000 385,000 1,657,000 2,187,000 4,456,000 1,207,000 
      income from continuing operations before income taxes
                                  64,055,000  241,431,000 208,017,000 55,262,000 111,877,000 259,061,000 177,894,000         48,992,000 74,391,000 216,963,000 136,473,000 16,452,000 53,188,000 178,559,000 125,098,000 -36,904,000 47,918,000 172,318,000 107,090,000 576,000 -3,197,000                               
      income from continuing operations
                                  38,747,000  178,992,000 314,132,000 35,853,000 70,808,000 162,012,000 114,038,000         23,713,000 45,721,000 133,367,000 87,016,000 7,536,000 33,474,000 112,340,000 77,348,000 -9,646,000 30,144,000 105,910,000 65,788,000 1,098,000 -1,474,000                               
      gain on sale of discontinued operations, net of tax
                                        2,716,000               5,294,000                                       
      income per share from continuing operations
                                  0.34  1.6 2.89 0.33 0.67 1.52 1.08         0.18 0.45 1.4 0.96 0.08 0.37 1.24 0.85 -0.11 0.33 1.16 0.72 0.01                                
      income per share from discontinued operations
                                        0.03 0.11              0.06 0.04 0.04 0.19 0.01 0.04 0.03 0.01 0.01                               
      net income per share
                                  0.34  1.6 2.89 0.33 0.67 1.55 1.19         0.18 0.45 1.4 0.96 0.08 0.43 1.28 0.89 0.08 0.34 1.2 0.75 0.02 -0.01                               
      income from discontinued operations, net of tax
                                         10,994,000               4,085,000 3,117,000 11,264,000 988,000 3,201,000 2,719,000 863,000 908,000                               
      loss from discontinued operations, net of tax
                                                                                              
      gross profit
                                         468,863,000 376,011,000 407,311,000 517,811,000 443,763,000 354,321,000 381,673,000 520,738,000 423,285,000 337,659,000 359,533,000 496,277,000 388,957,000 300,440,000 316,497,000 432,751,000 362,362,000 227,806,000 298,790,000 434,261,000 362,882,000 242,044,000 266,805,000 464,822,000 373,560,000 246,543,000 253,228,000 454,321,000 410,849,000 231,799,000 259,640,000 460,051,000 395,212,000 271,072,000 246,222,000 434,394,000 369,638,000 217,788,000 228,016,000 428,686,000 375,592,000 260,077,000 204,500,000 405,403,000 346,590,000 201,706,000 224,349,000 378,583,000 324,452,000 89,520,000 107,492,000 206,126,000 159,053,000 
      yoy
                                         5.66% 6.12% 6.72% -0.56% 4.84% 4.93% 6.16% 4.93% 8.83% 12.39% 13.60% 14.68% 7.34% 31.88% 5.93% -0.35% -0.14% -5.88% 11.99% -6.57% -2.86% -1.82% 5.36% 2.31% -9.08% 6.36% -2.47% -1.25% 3.96% -14.49% 5.45% 5.91% 6.92% 24.47% 7.98% 1.33% -1.59% -16.26% 11.50% 5.74% 8.37% 28.94% -8.85% 7.08% 6.82% 125.32% 108.71% 83.67% 103.99%     
      qoq
                                         24.69% -7.68% -21.34% 16.69% 25.24% -7.17% -26.71% 23.02% 25.36% -6.08% -27.55% 27.59% 29.46% -5.07% -26.86% 19.43% 59.07% -23.76% -31.20% 19.67% 49.92% -9.28% -42.60% 24.43% 51.52% -2.64% -44.26% 10.58% 77.24% -10.72% -43.56% 16.41% 45.80% 10.09% -43.32% 17.52% 69.72% -4.49% -46.81% 14.14% 44.42% 27.18% -49.56% 16.97% 71.83% -10.09% -40.74% 16.68% 262.44% -16.72% -47.85% 29.60%  
      gross margin %
    0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% 
      operating expenses
                                                                                              
      operation and maintenance
                                         124,938,000 164,808,000 137,444,000 133,666,000 124,848,000 157,379,000 132,447,000 133,460,000 118,582,000 139,163,000 125,559,000 124,675,000 115,757,000 149,149,000 121,258,000 111,086,000 106,527,000 119,548,000 107,295,000 110,708,000 116,062,000 107,973,000 112,665,000 116,379,000 116,594,000 113,740,000 113,348,000 117,088,000 123,862,000 128,698,000 110,895,000 121,740,000 134,755,000 141,170,000 117,822,000 120,053,000 121,189,000 117,711,000 118,430,000 111,862,000 115,370,000 108,123,000 104,380,000 112,698,000 108,217,000 113,981,000 94,518,000 106,109,000 113,126,000 47,994,000 50,467,000 59,093,000 56,916,000 
      depreciation and amortization
                                         76,958,000 76,426,000 73,459,000 71,972,000 71,239,000 70,737,000 68,444,000 68,022,000 67,593,000 68,256,000 63,955,000 61,307,000 60,469,000 60,191,000 58,129,000 57,180,000 59,579,000 58,219,000 59,819,000 60,272,000 59,215,000 59,923,000 56,932,000 57,136,000 56,161,000 56,753,000 53,288,000 53,080,000 53,839,000 56,451,000 54,181,000 53,450,000 53,126,000 52,783,000 50,356,000 48,790,000 48,513,000 49,828,000 48,974,000 51,066,000 48,995,000 48,422,000 46,838,000 47,076,000 43,260,000 45,234,000 43,448,000 45,326,000 43,997,000 26,768,000 23,268,000 23,138,000 23,473,000 
      total operating expenses
                                         258,945,000 291,378,000 270,147,000 267,795,000 247,558,000 278,468,000 264,066,000 270,528,000 235,560,000 253,715,000 252,928,000 246,197,000 218,237,000 250,057,000 230,101,000 222,573,000 207,440,000 219,124,000 214,001,000 225,899,000 218,475,000 200,711,000 232,727,000 246,900,000 213,451,000 206,352,000 219,119,000 229,781,000 220,253,000 217,821,000 215,957,000 233,504,000 232,018,000 233,538,000 225,513,000 223,251,000 211,129,000 207,055,000 220,285,000 219,674,000 204,432,000 212,794,000 199,697,000 224,570,000          
      regulated distribution segment
                                          389,353,000 414,226,000 849,685,000 638,602,000 369,656,000 416,794,000 1,130,613,000 846,772,000                                             
      regulated pipeline segment
                                          109,204,000 109,249,000 95,703,000 94,677,000 97,807,000 97,008,000 91,730,000 83,567,000                                             
      nonregulated segment
                                          291,889,000 214,555,000 287,395,000 272,524,000 292,830,000 278,769,000 438,322,000 462,288,000 396,855,000 465,033,000 757,683,000 447,721,000 348,061,000 421,808,000 428,948,000 399,894,000 280,114,000 256,250,000 370,763,000 444,176,000 474,437,000 491,285,000 583,531,000 475,640,000                             
      weighted-average shares outstanding:
                                                                                              
      basic
      158,943    152,508    145,121    137,830    129,779    122,788    117,200            103,524    101,892 102,000 101,746 101,581 97,606 100,267 95,264 90,833 90,533 90,603 90,530 90,359 90,150 90,118 90,020 90,254 90,201 90,127 90,246 90,082 91,852 92,648 92,518 92,152 91,117 91,338 90,895 90,471 89,385 89,648 89,314 89,006 86,975 88,366 88,078 82,726 80,731 80,840 80,573 80,259 78,508 79,683 79,270 75,306 54,021 52,220 51,850 51,483 
      diluted
      160,573    152,666    145,166    138,096    129,834    122,872    117,461            103,524    101,892 102,000 101,746 101,581 97,608 101,150 96,191 91,746 91,711 91,550 91,492 91,309 91,172 90,993 90,322 90,546 90,652 90,127 90,533 90,408 92,422 92,648 92,853 92,509 92,024 92,002 91,567 91,066 90,272 89,648 89,990 89,608 87,745 88,366 88,735 83,350 81,390 80,840 81,040 80,722 79,012 80,144 79,760 75,725 54,416 52,617 52,240 51,861 
      natural gas distribution segment
                                                  663,133,000 517,707,000 1,290,960,000 843,865,000 360,386,000 467,144,000 905,176,000 666,787,000 237,979,000 325,051,000 889,008,000 693,292,000 343,956,000 407,031,000 1,113,204,000 727,195,000 338,340,000 405,271,000 1,365,988,000 802,894,000 311,392,000 386,985,000 1,230,420,000 1,055,968,000 528,458,000 676,639,000 1,521,856,000 928,177,000                 
      regulated transmission and storage segment
                                                  58,036,250 87,189,000 73,615,000 71,341,000 72,330,000 74,041,000 61,848,000 60,681,000 65,482,000 67,073,000 58,037,000 56,759,000 61,820,000 53,570,000 54,976,000 49,007,000 56,015,000 44,957,000 55,181,000 46,860,000 46,397,000 49,345,000 59,234,000 54,682,000 53,145,000 46,286,000 51,440,000 45,046,000                 
      basic earnings per share
                                                                                              
      diluted earnings per share
                                                                                              
      asset impairments
                                                               10,988,000        3,304,000                       
      asset impairment
                                                                19,282,000                              
      income tax benefit
                                                               -1,723,000    -877,000        -4,573,000    -9,122,000               
      basic earning per share
                                                                                              
      loss per share from continuing operations
                                                               -0.02                               
      natural gas marketing segment
                                                                  493,435,000 421,406,000 692,152,000 544,271,000 387,190,000 453,504,000 708,658,000 787,495,000 1,128,770,000 1,189,722,000 1,128,653,000 840,717,000 790,428,000 854,167,000 795,041,000 711,694,000 673,603,000 562,447,000 818,629,000          
      pipeline, storage and other segment
                                                                  6,449,000 8,196,000 9,050,000 11,623,000 4,978,000 8,226,000 12,272,000 16,448,000 11,080,000 3,880,000 10,022,000 6,727,000                 
      operating revenues - sum
                                                                      1,079,628,250 780,775,000 1,821,406,000 1,716,332,000 1,440,665,000 1,639,145,000 2,483,985,000 1,657,510,000 1,002,064,000 1,218,152,000 2,075,582,000 1,602,633,000 971,454,000 863,243,000 2,033,846,000          
      purchased gas cost - sum
                                                                      800,902,500 521,135,000 1,361,355,000 1,321,120,000 1,169,593,000 1,392,923,000 2,049,591,000 1,287,872,000 784,276,000 990,136,000 1,646,896,000 1,227,041,000 711,377,000 658,743,000 1,628,443,000          
      impairment of long-lived assets
                                                                                              
      basic net loss per share
                                                                           -0.07    -0.15               
      diluted net loss per share
                                                                           -0.07    -0.15               
      utility segment
                                                                              743,382,000 548,251,000 1,461,033,000 964,244,000 395,917,000 402,044,000 1,447,620,000 1,405,010,000 452,347,000 501,735,000 1,235,377,000 913,681,000 212,706,000 256,252,000 708,282,000 460,488,000 
      other nonutility segment
                                                                              744,750 843,000 783,000 1,353,000 1,398,000 1,413,000 1,595,000 1,492,000 1,244,000 1,421,000 1,278,000 1,359,000 2,659,000 6,210,000 10,654,000  
      per share data
                                                                                              
      basic income per share
                                                                                           0.09   
      diluted income per share
                                                                                           0.09   
      income before income taxes and cumulative effect of accounting change
                                                                                          -10,994,000  93,710,000  
      income before cumulative effect of accounting change
                                                                                          -6,384,000  58,305,000  
      cumulative effect of accounting change, net of income tax benefit
                                                                                              
      basic income per share:
                                                                                              
      diluted income per share:
                                                                                              
      other non-utility segment
                                                                                             3,628,000 
    Balance Sheets:
    Quarterly
    Annual
      Unit: USD2026-03-31 2025-12-31 2025-09-30 2025-06-30 2025-03-31 2024-12-31 2024-09-30 2024-06-30 2024-03-31 2023-12-31 2023-09-30 2023-06-30 2023-03-31 2022-12-31 2022-09-30 2022-06-30 2022-03-31 2021-12-31 2021-09-30 2021-06-30 2021-03-31 2020-12-31 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 2005-12-31 2005-09-30 2005-06-30 2005-03-31 2004-12-31 2004-09-30 2004-06-30 2004-03-31 2003-12-31 
                                                                                                
        assets
                                                                                                
        property, plant and equipment
      31,191,277,000 30,322,427,000 28,028,820,000 28,287,941,000 27,451,302,000 26,675,943,000 24,784,285,000 24,979,631,000 24,283,917,000 23,683,937,000 21,958,447,000 22,224,360,000 21,582,327,000 20,987,313,000 19,402,271,000 19,502,000,000 19,019,069,000 18,573,857,000 17,258,547,000 17,265,383,000 16,752,585,000 16,412,507,000 15,539,166,000 15,443,224,000 15,044,831,000 14,691,719,000 13,758,899,000 13,687,833,000 13,272,148,000 12,948,229,000 12,217,648,000 12,260,376,000 11,903,715,000 11,609,627,000 11,001,910,000 10,952,422,000 10,725,834,000 10,492,625,000 9,987,078,000 9,972,415,000 9,722,228,000 9,502,944,000 8,959,702,000 9,017,043,000 8,789,599,000 8,661,288,000 8,200,121,000 8,217,954,000 8,014,440,000 7,861,741,000 7,446,272,000 7,494,175,000 7,435,103,000 7,283,533,000 6,860,358,000 7,128,484,000 6,992,899,000 6,896,521,000 6,607,552,000 6,599,950,000 6,693,971,000 6,638,718,000 6,384,396,000 6,402,065,000 6,295,260,000 6,196,043,000 5,981,420,000 5,963,098,000 5,873,028,000 5,803,491,000 5,650,096,000 5,604,416,000 5,518,436,000 5,467,260,000 5,326,621,000 5,289,268,000 5,228,334,000 5,162,006,000 5,026,478,000 4,993,093,000 4,943,329,000 4,853,016,000 4,631,684,000 4,687,891,000 4,606,713,000 4,544,069,000 2,595,374,000 2,588,059,000 2,552,376,000 2,523,100,000 
        less accumulated depreciation and amortization
      4,121,333,000 4,054,556,000 3,971,146,000 3,909,798,000 3,819,079,000 3,713,900,000 3,643,716,000 3,557,513,000 3,469,354,000 3,364,456,000 3,291,791,000 3,206,019,000 3,136,441,000 3,015,645,000 2,997,900,000 2,945,397,000 2,934,096,000 2,847,066,000 2,821,128,000 2,787,634,000 2,712,997,000 2,650,364,000 2,601,874,000 2,562,374,000 2,496,591,000 2,441,296,000 2,392,924,000 2,347,237,000 2,300,414,000 2,250,000,000 2,196,226,000 2,188,516,000 2,142,386,000 2,090,835,000 2,042,122,000 2,028,041,000 1,987,347,000 1,939,663,000 1,890,629,000 1,918,868,000 1,882,815,000 1,849,657,000 1,809,520,000 1,804,955,000 1,763,521,000 1,748,747,000 1,721,794,000 1,756,504,000 1,744,457,000 1,708,778,000 1,691,364,000 1,652,960,000 1,724,830,000 1,688,239,000 1,658,866,000 1,686,598,000 1,658,887,000 1,650,308,000 1,668,876,000 1,683,899,000 1,779,321,000 1,779,374,000 1,749,243,000 1,733,022,000 1,704,785,000 1,672,855,000 1,647,515,000 1,623,734,000 1,609,836,000 1,608,743,000 1,593,297,000 1,591,528,000 1,569,570,000 1,579,134,000 1,559,234,000 1,531,792,000 1,516,504,000 1,494,091,000 1,472,152,000 1,414,010,000 1,432,287,000 1,413,082,000 1,391,243,000 1,383,080,000 1,355,118,000 1,320,926,000 911,130,000 903,313,000 891,040,000 984,876,000 
        net property, plant and equipment
      27,069,944,000 26,267,871,000 25,292,990,000 24,378,143,000 23,632,223,000 22,962,043,000 22,204,367,000 21,422,118,000 20,814,563,000 20,319,481,000 19,606,583,000 19,018,341,000 18,445,886,000 17,971,668,000 17,240,239,000 16,556,603,000 16,084,973,000 15,726,791,000 15,063,970,000 14,477,749,000 14,039,588,000 13,762,143,000 13,355,347,000 12,880,850,000 12,548,240,000 12,250,423,000 11,787,669,000 11,340,596,000 10,971,734,000 10,698,229,000 10,371,147,000 10,071,860,000 9,761,329,000 9,518,792,000 9,259,182,000 8,924,381,000 8,738,487,000 8,552,962,000 8,280,511,000 8,053,547,000 7,839,413,000 7,653,287,000 7,430,580,000 7,212,088,000 7,026,078,000 6,912,541,000 6,725,906,000 6,461,450,000 6,269,983,000 6,152,963,000 6,030,655,000 5,841,215,000 5,710,273,000 5,595,294,000 5,475,604,000 5,441,886,000 5,334,012,000 5,246,213,000 5,147,918,000 4,916,051,000 4,914,650,000 4,859,344,000 4,793,075,000 4,669,043,000 4,590,475,000 4,523,188,000 4,439,103,000 4,339,364,000 4,263,192,000 4,194,748,000 4,136,859,000 4,012,888,000 3,948,866,000 3,888,126,000 3,836,836,000 3,757,476,000 3,711,830,000 3,667,915,000 3,629,156,000 3,579,083,000 3,511,042,000  3,374,367,000    1,722,521,000    
        current assets
                                                                                                
        cash and cash equivalents
      125,694,000 367,023,000 202,687,000 709,378,000 543,504,000 584,536,000 307,340,000 674,620,000 262,497,000 278,315,000 15,404,000 56,237,000 95,175,000 171,597,000 51,554,000 328,075,000 582,495,000 264,005,000 116,723,000 524,621,000 865,311,000 457,599,000 20,808,000 208,064,000 320,099,000 189,272,000 24,550,000 46,163,000 108,353,000 218,197,000 13,771,000 20,930,000 71,074,000 54,750,000 26,409,000 69,777,000 45,403,000 44,624,000 47,534,000 66,206,000 47,918,000 78,903,000 28,653,000 43,153,000 95,525,000 123,832,000 42,258,000 51,421,000 136,740,000 194,563,000 66,199,000 31,979,000 65,547,000 124,601,000 64,239,000 27,706,000 47,040,000 85,160,000 131,419,000 117,429,000 153,246,000 129,892,000 131,952,000 180,383,000 231,153,000 174,829,000 111,203,000 125,735,000 482,085,000 69,799,000 46,717,000 46,501,000 139,636,000 51,874,000 60,725,000 350,383,000 176,280,000 94,406,000 75,815,000 26,849,000 48,899,000 49,451,000 40,116,000 23,637,000 247,126,000 25,162,000 201,932,000 126,895,000 114,983,000 41,710,000 
        restricted cash and cash equivalents
      1,414,000 4,488,000 1,116,000 4,223,000 1,616,000 4,870,000 1,516,000 4,642,000 1,272,000 7,130,000 3,844,000 1,876,000                                                                               
        cash and cash equivalents and restricted cash and cash equivalents
      127,108,000 371,511,000 203,803,000 713,601,000 545,120,000 589,406,000 308,856,000 679,262,000 263,769,000 285,445,000 19,248,000 58,113,000                                                                               
        accounts receivable
      644,630,000 731,131,000  399,533,000 660,634,000 628,871,000  391,551,000 596,433,000 646,401,000  330,827,000 523,741,000 826,416,000  375,257,000 565,184,000 514,333,000  291,122,000 469,595,000 492,526,000  236,466,000 377,817,000 435,616,000  285,433,000 419,612,000 478,373,000  253,546,000 407,134,000 489,217,000  250,224,000 336,637,000 458,813,000  277,362,000 361,582,000 456,904,000  301,743,000 511,830,000 607,421,000  388,874,000 671,021,000 661,213,000  350,237,000 485,601,000 500,863,000  216,753,000 350,261,000 489,797,000  342,092,000 458,813,000 564,934,000  299,835,000 546,356,000 597,012,000  241,582,000 531,749,000 833,125,000  601,164,000 805,940,000 776,866,000  429,119,000 721,058,000 766,632,000  409,087,000 793,019,000 1,229,190,000  299,954,000 527,411,000 640,760,000  243,719,000 396,879,000 407,045,000 
        gas stored underground
      135,871,000 159,529,000 171,756,000 139,082,000 97,254,000 153,034,000 169,508,000 157,912,000 144,128,000 220,944,000 245,830,000 211,041,000 183,467,000 323,678,000 357,941,000 223,993,000 96,295,000 220,279,000 178,116,000 99,469,000 50,043,000 99,569,000 111,950,000 84,886,000 68,061,000 115,259,000 130,138,000 106,014,000 78,148,000 146,552,000 165,732,000 126,010,000 89,265,000 163,959,000 184,653,000 151,656,000 120,026,000 163,763,000 233,316,000 244,841,000 190,961,000 236,017,000 236,603,000 213,151,000 143,154,000 277,916,000 278,917,000 207,458,000 124,950,000 286,542,000 244,741,000 209,101,000 197,356,000 274,126,000 256,415,000 239,329,000 221,112,000 325,669,000 289,760,000 256,768,000 228,051,000 339,105,000 319,038,000 263,752,000 208,589,000 399,582,000 352,728,000 317,275,000 327,288,000 582,743,000 576,617,000 571,532,000 421,980,000 564,426,000 515,128,000 463,896,000 364,478,000 520,034,000 461,502,000 437,069,000 440,946,000 583,572,000 450,807,000 334,245,000 273,811,000 389,625,000 200,134,000 90,141,000 74,570,000 192,568,000 
        other current assets
      354,410,000 373,652,000 301,627,000 299,756,000 288,275,000 456,816,000 288,068,000 479,840,000 428,105,000 526,927,000 292,036,000 288,945,000 270,723,000 2,306,072,000 2,274,490,000 2,354,526,000 2,285,022,000 2,275,588,000 2,200,909,000 200,154,000 235,485,000 142,594,000 107,905,000 72,743,000 63,584,000 71,982,000 72,772,000 65,924,000 65,068,000 69,616,000 46,055,000 52,369,000 55,263,000 70,984,000 106,321,000 62,725,000 61,018,000 76,750,000 100,829,000 60,504,000 52,451,000 91,446,000 70,569,000 58,602,000 67,128,000 109,595,000 111,265,000 126,890,000 126,450,000 157,252,000 70,334,000 90,936,000 253,916,000 265,044,000 272,782,000 291,870,000 275,428,000 360,615,000 316,471,000 273,459,000 143,978,000 229,324,000 150,995,000 130,003,000 121,261,000 115,155,000 132,203,000 111,420,000 137,433,000 197,441,000 184,619,000 115,609,000 95,567,000 126,855,000 112,909,000 77,519,000 126,838,000 194,566,000 169,952,000 118,990,000 195,412,000 239,992,000 238,238,000 75,958,000 112,428,000 152,686,000 63,236,000 18,710,000 54,057,000 88,673,000 
        total current assets
      1,262,019,000 1,635,823,000 1,052,695,000 1,551,972,000 1,591,283,000 1,828,127,000 1,132,314,000 1,708,565,000 1,432,435,000 1,679,717,000 885,768,000 888,926,000 1,073,106,000 3,627,763,000 3,047,693,000 3,281,851,000 3,528,996,000 3,274,205,000 2,838,715,000 1,115,366,000 1,620,434,000 1,192,288,000 471,258,000 602,159,000 829,561,000 812,129,000 458,031,000 503,534,000 671,181,000 912,738,000 478,853,000 452,855,000 622,736,000 778,910,000 539,646,000 534,382,000 563,084,000 979,432,000 681,686,000 648,913,000 652,912,000 863,270,000 630,985,000 616,649,000 817,637,000 1,118,764,000 775,840,000 774,643,000 1,059,161,000 1,299,570,000 683,266,000 682,253,000 1,002,420,000 1,164,634,000 827,962,000 775,658,000 893,841,000 1,261,241,000 1,010,953,000 989,748,000 984,088,000 1,263,255,000 875,192,000 873,973,000 1,107,359,000 1,286,578,000 828,940,000 796,012,000 1,478,555,000 1,683,108,000 1,285,104,000 1,396,958,000 1,492,714,000 1,520,021,000 1,068,895,000 1,334,493,000 1,429,417,000 1,575,638,000 1,117,545,000 1,050,171,000 1,491,813,000          
        securitized intangible asset
      70,433,000 72,798,000  77,246,000 78,892,000 80,580,000  84,998,000 87,279,000 90,036,000  93,600,000                                                                               
        goodwill
      731,257,000 731,257,000 731,257,000 731,257,000 731,257,000 731,257,000 731,257,000 731,257,000 731,257,000 731,257,000 731,257,000 731,257,000 731,257,000 731,257,000 731,257,000 731,257,000 731,257,000 731,257,000 731,257,000 731,257,000 731,257,000 731,257,000 731,257,000 730,706,000 730,706,000 730,706,000 730,706,000 730,419,000 730,419,000 730,419,000 730,419,000 730,132,000 730,132,000 730,132,000 730,132,000 729,673,000 729,673,000 729,673,000 743,407,000 742,702,000 742,702,000 742,702,000 742,702,000 742,029,000 742,029,000 742,029,000 742,029,000 741,363,000 741,363,000 741,363,000                                         
        deferred charges and other assets
      1,246,443,000 1,090,646,000 1,097,453,000 973,909,000 946,726,000 895,086,000 1,043,683,000 944,313,000 939,106,000 863,752,000 1,201,158,000 1,039,405,000 1,061,612,000 1,035,473,000 1,173,800,000 1,085,773,000 925,917,000 813,531,000 974,720,000 2,991,063,000 3,017,531,000 790,191,000 801,170,000 657,267,000 607,891,000 594,867,000 391,213,000 306,549,000 301,616,000 274,403,000 294,018,000 252,777,000 242,125,000 236,886,000 220,636,000 310,339,000 330,222,000 317,088,000 305,285,000 282,206,000 308,899,000 295,394,000 288,678,000 313,723,000 340,900,000 341,759,000 350,929,000 379,733,000 417,109,000 422,195,000 484,996,000 538,516,000 500,212,000 463,454,000 451,262,000 392,117,000 400,689,000 387,982,000 383,793,000 347,994,000 357,252,000 359,033,000 355,376,000 303,041,000 315,606,000 325,751,000 335,659,000 222,039,000 205,242,000 202,114,000 225,650,000 237,723,000 242,034,000 254,080,000 253,494,000 225,775,000 229,634,000 234,473,000 234,325,000 249,874,000 256,701,000 265,146,000 276,943,000 286,699,000 261,039,000 271,682,000 231,978,000 240,477,000 243,494,000 267,952,000 
        capitalization and liabilities
                                                                                                
        shareholders’ equity
      14,908,650,000 14,282,892,000 13,558,890,000 13,385,838,000 13,137,965,000 12,780,481,000 12,157,669,000 12,183,076,000 11,618,639,000 11,273,209,000 10,870,064,000 10,602,381,000 10,205,205,000 9,836,274,000 9,419,091,000 9,268,171,000 8,983,231,000 8,289,545,000 7,906,889,000 7,773,758,000 7,820,925,000 7,213,156,000 6,791,203,000 6,461,471,000 6,304,415,000 6,127,775,000 5,750,223,000 5,641,996,000 5,508,101,000 5,348,195,000 4,769,951,000 4,759,552,000 4,721,346,000 4,563,620,000 3,898,666,000 3,901,710,000 3,834,864,000 3,698,975,000 3,463,059,000 3,466,724,000 3,344,565,000 3,272,109,000 3,194,797,000 3,238,255,000 3,139,694,000 3,063,925,000 3,086,232,000 3,116,685,000 3,124,761,000 2,661,314,000 2,580,409,000 2,581,444,000 2,543,470,000 2,424,005,000 2,359,243,000 2,354,925,000 2,360,712,000 2,267,762,000 2,255,421,000 2,335,824,000 2,373,979,000 2,274,853,000 2,178,348,000 2,313,730,000 2,338,843,000 2,258,076,000 2,176,761,000 2,191,520,000 2,178,494,000 2,078,076,000 2,052,492,000 2,105,407,000 2,125,993,000 2,032,483,000 1,965,754,000 1,988,142,000 2,021,953,000 1,920,457,000 1,648,098,000 1,664,556,000 1,706,291,000          
        common stock
      835,000 827,000 808,000 803,000 794,000 794,000 776,000 776,000 754,000 754,000 742,000 737,000 722,000 716,000 704,000 699,000 695,000 677,000 662,000 654,000 653,000 641,000 629,000 617,000 612,000 611,000 597,000 591,000 585,000 584,000 556,000 556,000 555,000 555,000 531,000 530,000 526,000 526,000 520,000 519,000 511,000 510,000 507,000 507,000 505,000 504,000 502,000 502,000 501,000 455,000 453,000 453,000 453,000 453,000 451,000 451,000   451,000           458,000  453,000 451,000        405,000          
        additional paid-in capital
      8,925,235,000 8,707,686,000 8,221,455,000 8,078,905,000 7,880,436,000 7,864,525,000 7,474,559,000 7,463,334,000 6,953,761,000 6,945,795,000 6,684,120,000 6,537,820,000 6,213,523,000 6,065,763,000 5,838,118,000 5,726,090,000 5,634,020,000 5,293,541,000 5,023,751,000 4,865,268,000 4,853,703,000 4,600,314,000 4,377,149,000 4,100,130,000 3,986,187,000 3,979,564,000 3,712,194,000 3,599,724,000 3,485,794,000 3,476,476,000 2,974,926,000 2,964,043,000 2,951,545,000 2,940,062,000 2,536,365,000 2,525,752,000 2,464,252,000 2,451,277,000 2,388,027,000 2,371,381,000 2,255,875,000 2,242,307,000 2,230,591,000 2,207,102,000 2,192,100,000 2,181,645,000 2,180,151,000 2,172,307,000 2,163,144,000 1,769,516,000 1,765,811,000 1,757,059,000 1,753,024,000 1,750,195,000 1,745,467,000 1,737,047,000 1,728,150,000 1,725,050,000 1,732,935,000 1,730,121,000 1,728,474,000 1,724,899,000 1,714,364,000 1,812,088,000 1,809,331,000 1,802,606,000 1,791,129,000 1,779,184,000 1,768,307,000 1,757,834,000 1,744,384,000 1,732,775,000 1,722,056,000 1,713,043,000 1,700,378,000 1,688,482,000 1,679,228,000 1,670,487,000 1,467,240,000 1,456,032,000 1,447,734,000 1,438,917,000 1,426,523,000 1,416,327,000 1,408,721,000 1,393,250,000 1,005,644,000 762,464,000 753,770,000 743,591,000 
        accumulated other comprehensive income
      465,272,000 470,210,000 475,015,000 477,960,000 476,551,000 482,138,000 465,715,000 510,132,000 495,700,000 468,592,000 518,528,000 404,403,000 360,997,000 391,330,000 369,112,000 305,210,000 145,579,000 23,856,000 69,803,000 61,239,000 140,471,000 2,532,000                         -12,393,000 11,300,000 36,834,000 63,032,000 38,878,000 23,289,000        5,746,000 14,009,000 19,601,000          693,000                 49,000  
        retained earnings
      5,517,308,000 5,104,169,000 4,861,612,000 4,828,170,000 4,780,184,000 4,433,024,000 4,216,619,000 4,208,834,000 4,168,424,000 3,858,068,000 3,666,674,000 3,659,421,000 3,629,963,000 3,378,465,000 3,211,157,000 3,236,172,000 3,202,937,000 2,971,471,000 2,812,673,000 2,846,597,000 2,826,098,000 2,609,669,000 2,471,014,000 2,477,451,000 2,430,257,000 2,261,131,000 2,152,015,000 2,157,344,000 2,138,532,000 1,985,250,000 1,878,116,000 1,871,334,000 1,854,257,000 1,729,319,000 1,467,024,000 1,480,027,000 1,456,980,000 1,339,826,000 1,262,534,000 1,273,057,000 1,245,418,000 1,132,254,000 1,073,029,000 1,092,887,000 1,075,177,000 975,975,000 917,972,000 932,576,000 924,282,000 828,311,000 775,267,000 800,643,000 793,927,000 709,438,000 660,932,000 684,907,000 685,206,000 607,485,000 570,495,000 599,506,000 631,044,000 529,900,000 486,905,000 515,742,000 550,259,000 467,449,000 405,353,000 451,856,000 480,355,000 381,633,000 343,601,000 371,486,000 407,464,000 325,183,000 281,127,000 315,587,000 357,425,000 279,299,000 224,299,000 243,956,000 287,727,000 224,435,000 178,837,000 220,569,000 240,920,000 177,108,000 142,030,000 167,535,000 178,769,000 136,336,000 
        long-term debt
      9,554,229,000 9,553,625,000 8,907,169,000 8,907,983,000 8,413,725,000 8,413,374,000 7,783,646,000 7,785,196,000 7,444,855,000 7,444,195,000 6,554,133,000 6,553,618,000 6,553,097,000 6,551,795,000 5,760,647,000 5,759,164,000 5,757,595,000 5,555,177,000 4,930,205,000 7,128,505,000 7,316,404,000 5,124,862,000 4,531,779,000 4,531,341,000 4,328,866,000 4,324,285,000 3,529,452,000 3,529,135,000 3,528,713,000 3,084,779,000 2,493,665,000 2,618,315,000 2,617,892,000 3,067,469,000 3,067,045,000 3,066,734,000 2,314,620,000 2,314,199,000 2,188,779,000 2,205,645,000 2,455,559,000 2,455,474,000 2,455,388,000 2,455,303,000 2,455,217,000 2,455,131,000 2,455,986,000 1,955,907,000 1,955,829,000 1,955,750,000 2,455,671,000 2,455,593,000 2,455,514,000 1,956,376,000 1,956,305,000 1,956,289,000 1,956,213,000 2,206,193,000 2,206,117,000 2,206,106,000 1,807,323,000 1,807,319,000 1,809,551,000 1,809,546,000 2,159,475,000 2,159,470,000 2,169,400,000 2,169,395,000 2,169,141,000 1,719,920,000 2,119,792,000 2,119,729,000 2,119,696,000 2,124,915,000 2,126,315,000 2,126,526,000 1,878,331,000 1,878,733,000 2,180,362,000 2,180,752,000 2,181,120,000 2,181,497,000 2,183,104,000 2,183,639,000 2,254,817,000 2,255,173,000 861,311,000 863,266,000 864,624,000 860,705,000 
        securitized long-term debt
      63,751,000 68,236,000 68,236,000 72,609,000 72,609,000 76,871,000 76,871,000 81,261,000 81,261,000 85,078,000 85,078,000 89,027,000                                                                               
        total capitalization
      24,526,630,000 23,904,753,000 22,534,295,000 22,366,430,000 21,624,299,000 21,270,726,000 20,018,186,000 20,049,533,000 19,144,755,000 18,802,482,000 17,509,275,000 17,245,026,000 16,758,302,000 16,388,069,000 15,179,738,000 15,027,335,000 14,740,826,000 13,844,722,000 12,837,094,000 14,902,263,000 15,137,329,000 12,338,018,000 11,322,982,000 10,992,812,000 10,633,281,000 10,452,060,000 9,279,675,000 9,171,131,000 9,036,814,000 8,432,974,000 7,263,616,000 7,377,867,000 7,339,238,000 7,631,089,000 6,965,711,000 6,968,444,000 6,149,484,000 6,013,174,000 5,651,838,000 5,672,369,000 5,800,124,000 5,727,583,000 5,650,185,000 5,693,558,000 5,594,911,000 5,519,056,000 5,542,218,000 5,072,592,000 5,080,590,000 4,617,064,000 5,036,080,000 5,037,037,000 4,998,984,000 4,380,381,000 4,315,548,000 4,311,214,000 4,316,925,000 4,473,955,000 4,461,538,000 4,541,930,000 4,181,302,000 4,082,172,000 3,987,899,000 4,123,276,000 4,498,318,000 4,417,546,000 4,346,161,000 4,360,915,000 4,347,635,000 3,797,996,000 4,172,284,000 4,225,136,000 4,245,689,000 4,157,398,000 4,092,069,000 4,114,668,000 3,900,284,000 3,799,190,000 3,828,460,000 3,845,308,000 3,887,411,000          
        current liabilities
                                                                                                
        accounts payable and accrued liabilities
      467,022,000 616,867,000 506,516,000 397,564,000 445,225,000 453,045,000 445,397,000 319,361,000 367,887,000 416,694,000 336,083,000 327,890,000 364,973,000 574,723,000 496,019,000 397,058,000 354,003,000 398,431,000 423,222,000 280,352,000 263,597,000 284,995,000 235,775,000 200,116,000 190,088,000 308,113,000 265,024,000 206,500,000 244,042,000 301,734,000 217,283,000 198,172,000 230,823,000 285,675,000 233,050,000 164,365,000 185,212,000 268,647,000 259,434,000 198,882,000 226,641,000 280,487,000 238,942,000 227,256,000 295,589,000 397,595,000 311,604,000 312,671,000 442,816,000 458,198,000 241,611,000 229,876,000 316,411,000 367,312,000 215,229,000 178,198,000 309,864,000 432,332,000 291,205,000 312,205,000 423,726,000 510,085,000 266,208,000 254,150,000 521,913,000 578,805,000 207,421,000 221,968,000 472,078,000 815,095,000 395,388,000 582,353,000 809,140,000 739,807,000 355,255,000 428,806,000 665,212,000 762,487,000 345,108,000 306,805,000 708,134,000 1,170,402,000 461,314,000 231,881,000 533,232,000 653,403,000 185,295,000 201,123,000 365,996,000 372,430,000 
        other current liabilities
      780,213,000 819,147,000 835,557,000 712,725,000 733,154,000 701,915,000 750,620,000 655,944,000 677,706,000 742,304,000 763,086,000 698,918,000 746,512,000 755,687,000 720,157,000 660,629,000 653,009,000 626,684,000 686,681,000 581,722,000 607,525,000 512,673,000 546,461,000 502,413,000 543,248,000 537,009,000 479,501,000 494,932,000 495,097,000 578,764,000 547,068,000 573,012,000 538,702,000 336,919,000 332,648,000 322,721,000 390,253,000 381,123,000 449,036,000 410,452,000 373,783,000 471,333,000 457,954,000 437,344,000 497,927,000 472,113,000 402,351,000 343,026,000 420,576,000 365,508,000 368,891,000 348,706,000 377,357,000 446,717,000 489,665,000 468,409,000 374,123,000 357,353,000 367,563,000 333,643,000 301,824,000 349,914,000 413,640,000 393,478,000 432,469,000 413,754,000 457,319,000 422,200,000 413,764,000 441,481,000 460,372,000 472,088,000 408,575,000 389,937,000 409,993,000 360,920,000 421,386,000 407,351,000 388,451,000 407,575,000 380,026,000 401,948,000 503,368,000 342,408,000 298,802,000 283,130,000 223,265,000 210,759,000 171,822,000 120,743,000 
        current maturities of long-term debt
      2,395,000 2,250,000 11,775,000 11,743,000 11,712,000 11,681,000 1,651,000 1,620,000 1,591,000 1,561,000 1,568,000 1,540,000 1,512,000 2,201,484,000 2,201,457,000 2,201,430,000 2,201,404,000 2,401,377,000 2,400,452,000 200,442,000 177,000 171,000 165,000 157,000 131,000 50,000  125,000,000 125,000,000 575,000,000 575,000,000 450,000,000 450,000,000    250,000,000 250,000,000 250,000,000 250,000,000        500,000,000 500,000,000 500,000,000    131,000 131,000 250,131,000 250,131,000 131,000 2,434,000 2,434,000 352,434,000 352,434,000 360,131,000 360,131,000 10,131,000 10,131,000 131,000 131,000 400,225,000 400,507,000 785,000 1,059,000 8,453,000 3,618,000 3,831,000 303,992,000 303,232,000 303,209,000 3,186,000 3,331,000 3,308,000 3,286,000 3,264,000 3,242,000 5,887,000 5,897,000 5,908,000 5,918,000 8,093,000 7,195,000 
        current maturities of securitized long-term debt
      8,858,000 8,767,000 8,767,000 8,418,000 8,418,000 8,207,000 8,207,000 8,001,000 8,001,000 9,922,000 9,922,000 5,973,000                                                                               
        total current liabilities
      1,258,488,000 1,447,031,000 1,362,615,000 1,130,450,000 1,198,509,000 1,174,848,000 1,205,875,000 984,926,000 1,055,185,000 1,170,481,000 1,352,592,000 1,034,321,000 1,112,997,000 3,531,894,000 3,602,600,000 3,259,117,000 3,208,416,000 3,426,492,000 3,510,355,000 1,062,516,000 871,299,000 797,839,000 782,401,000 702,686,000 933,390,000 845,172,000 1,209,440,000 901,374,000 864,139,000 1,455,498,000 1,915,131,000 1,465,961,000 1,349,127,000 959,410,000 1,013,443,000 745,659,000 1,496,072,000 1,949,815,000 1,788,281,000 1,529,800,000 1,227,353,000 1,515,056,000 1,154,823,000 916,577,000 1,018,502,000 1,420,611,000 910,650,000 1,155,697,000 1,363,392,000 2,013,501,000 978,486,000 720,580,000 926,766,000 1,645,051,000 1,275,954,000 1,110,229,000 1,108,114,000 1,179,801,000 867,598,000 648,282,000 1,077,984,000 1,460,426,000 1,166,079,000 1,007,759,000 964,513,000 1,182,402,000 737,421,000 644,299,000 1,286,067,000 2,017,916,000 1,207,087,000 1,168,757,000 1,226,168,000 1,335,606,000 919,678,000 1,093,718,000 1,389,830,000 1,627,518,000 1,119,161,000 1,014,798,000 1,353,783,000          
        deferred income taxes
      3,180,269,000 3,028,313,000 2,918,347,000 2,856,784,000 2,793,163,000 2,674,678,000 2,593,342,000 2,549,829,000 2,486,024,000 2,379,421,000 2,304,974,000 2,205,291,000 2,135,738,000 2,075,596,000 1,999,505,000 1,936,658,000 1,848,626,000 1,744,648,000 1,705,809,000 1,667,784,000 1,658,000,000 1,542,394,000 1,456,569,000 1,420,065,000 1,421,779,000 1,352,333,000 1,300,015,000 1,280,307,000 1,251,836,000 1,191,824,000 1,154,067,000 1,133,622,000 1,107,036,000 1,033,206,000 1,878,699,000 1,853,564,000 1,810,160,000 1,725,433,000 1,603,056,000 1,585,500,000 1,557,790,000 1,441,325,000 1,411,315,000 1,429,090,000 1,338,755,000 1,256,443,000 1,286,616,000 1,341,294,000 1,283,551,000 1,230,052,000 1,164,053,000 1,197,274,000 1,168,140,000 1,066,273,000 1,015,083,000 1,085,654,000 1,062,488,000 981,559,000 960,093,000 967,607,000 944,605,000 892,090,000 829,128,000 755,722,000 594,269,000 588,423,000 570,940,000 510,901,000 466,868,000 431,324,000 441,302,000 450,669,000 420,232,000 378,425,000 370,569,000 367,025,000 342,328,000 324,296,000 306,172,000 283,757,000 287,841,000 284,196,000 292,207,000 222,699,000 245,836,000 200,737,000 213,930,000 227,899,000 234,355,000 243,079,000 
        regulatory excess deferred taxes
      103,214,000 106,099,000 117,482,000 133,627,000 155,169,000 173,001,000 177,315,000 195,505,000 216,284,000 231,981,000 253,212,000 277,506,000 315,071,000 345,799,000 385,213,000 425,960,000 470,918,000 508,731,000 549,227,000 587,680,000 639,496,000 695,191,000 697,764,000 702,493,000 694,433,000 699,375,000 705,101,000 709,974,000 712,681,000 717,758,000 739,670,000 733,509,000 737,798,000 746,246,000                                                         
        regulatory cost of removal obligation
      509,930,000 520,047,000 532,461,000 529,760,000 527,287,000 520,190,000 507,815,000 515,629,000 506,860,000 498,135,000 497,017,000 487,996,000 481,723,000 494,626,000 487,631,000 479,962,000 476,026,000 474,695,000 468,688,000 464,536,000 465,104,000 456,264,000 457,188,000 458,101,000 448,681,000 451,178,000 473,172,000 464,855,000 462,249,000 468,825,000 466,405,000 482,001,000 484,746,000 480,086,000 485,420,000 457,060,000 444,848,000 430,407,000 424,281,000 427,332,000 426,756,000 425,555,000 427,553,000 432,153,000 441,655,000 443,931,000 445,387,000 391,785,000 358,262,000 356,617,000 359,299,000 360,578,000 366,854,000 371,608,000 381,164,000 381,797,000 414,001,000 437,660,000 428,947,000 396,201,000 364,709,000 354,871,000 350,521,000 314,708,000 317,203,000 314,126,000 321,086,000 322,529,000 313,486,000 305,784,000 298,645,000 280,108,000 277,560,000 279,625,000 271,059,000 261,436,000 261,984,000 255,321,000 261,376,000 275,955,000 275,209,000 268,999,000 263,424,000 254,988,000 246,285,000 241,986,000 103,579,000 105,059,000 104,152,000  
        deferred credits and other liabilities
      801,565,000 792,152,000 784,322,000 695,476,000 681,954,000 683,650,000 691,932,000 595,829,000 595,532,000 601,743,000 599,898,000 521,389,000 508,030,000 530,177,000 538,302,000 526,452,000 526,331,000 546,496,000 537,489,000 630,656,000 637,582,000 646,173,000 642,128,000 594,825,000 584,834,000 588,007,000 121,133,000 175,855,000 170,638,000 172,328,000 158,028,000 74,718,000 100,929,000 181,346,000 175,735,000 169,129,000 155,057,000 158,611,000 245,690,000 228,788,000 237,526,000 155,195,000 161,696,000 94,971,000 181,932,000 129,702,000 68,870,000 48,477,000 40,970,000 39,323,000 43,696,000 42,789,000 39,438,000 44,211,000 507,926,000 460,941,000 467,199,000 562,657,000 564,695,000 439,450,000 427,224,000 432,064,000 430,164,000 384,185,000 378,887,000 372,927,000 368,158,000 257,386,000 271,705,000 265,879,000 267,381,000 260,120,000 251,345,000 248,709,000 243,542,000 218,962,000 214,672,000 210,070,000 204,378,000 196,659,000 192,807,000 196,998,000 199,615,000 203,077,000 195,315,000 197,895,000 143,136,000 139,662,000 139,301,000 137,647,000 
        construction in progress
        1,235,316,000    1,063,798,000    939,927,000    835,868,000    626,551,000    418,055,000    421,694,000    349,725,000    299,394,000    184,062,000    280,398,000    247,579,000    275,747,000    274,112,000    209,242,000    157,922,000    105,198,000    80,060,000    69,449,000    74,830,000    133,926,000    38,277,000    
        assets - sum
        29,264,136,000                                                                    5,730,156,000    5,396,070,000    5,101,308,000    4,765,610,000    2,633,651,000    
        accounts receivables
        375,509,000    365,882,000    328,654,000    363,708,000    342,967,000    230,595,000    230,571,000    253,295,000    222,263,000    300,007,000    295,160,000    343,400,000    301,992,000    234,526,000    273,303,000    273,207,000    232,806,000    477,151,000    380,133,000    374,629,000            
        securitized intangible asset, less accumulated amortization of 18,473 in 2025 and 10,756 in 2024
        75,127,000                                                                                        
        commitments and contingencies
                                                                                                
        securitized intangible asset, less accumulated amortization of 10,756 in 2024 and 1,398 in 2023
            82,844,000                                                                                    
        short-term debt
                241,933,000    184,967,000          199,923,000  464,915,000 74,942,000   575,780,000 244,777,000 129,602,000 336,816,000 447,745,000 258,573,000 670,607,000 940,747,000 829,811,000 670,466,000 626,929,000 763,236,000 457,927,000 251,977,000 224,986,000 550,903,000 196,695,000   689,795,000 367,984,000 141,998,000 232,998,000 830,891,000 570,929,000 213,491,000 173,996,000 389,985,000 206,396,000   247,993,000 126,100,000   179,712,000 72,550,000   360,833,000 350,542,000 113,257,000  202,244,000 150,599,000   154,471,000 382,416,000 297,087,000 262,315,000 474,059,000 144,809,000   28,797,000    191,795,000 
        securitized intangible asset, less accumulated amortization of 1,398 in 2023
                92,202,000                                                                                
        accumulated other comprehensive loss
                            -57,589,000 -116,727,000 -112,641,000 -113,531,000 -114,583,000 -115,663,000 -116,810,000 -114,115,000 -83,647,000 -76,381,000 -85,011,000 -106,316,000 -105,254,000 -104,599,000 -86,894,000 -92,654,000 -188,022,000 -178,233,000 -157,239,000 -102,962,000 -109,330,000 -62,241,000 -128,088,000 -94,199,000       -3,934,000 -36,081,000 -47,607,000 -67,480,000 -53,094,000 -65,221,000 -48,460,000    -23,372,000 -14,566,000 -21,213,000 -12,444,000 -20,184,000 -39,981,000 -70,628,000 -61,849,000 -35,947,000  -3,978,000 -6,193,000 -16,198,000 -16,373,000 -15,144,000 -29,771,000 -43,850,000 -35,840,000 -29,575,000 -26,139,000 -3,341,000 -21,287,000 -17,770,000 -31,676,000 -14,529,000 -3,416,000  -834,000 
        pension and postretirement liabilities
                                279,083,000 177,602,000 176,593,000 176,582,000 177,520,000 239,946,000 237,448,000 233,337,000 230,588,000 304,919,000 305,845,000 301,715,000 297,743,000 283,579,000 294,377,000 289,939,000 287,373,000 318,140,000 350,889,000 345,350,000 340,963,000 347,344,000 360,851,000 359,534,000 358,787,000 444,540,000 453,548,000                                      
        current assets of disposal group classified as held for sale
                                           235,482,000                                                     
        noncurrent assets of disposal group classified as held for sale
                                                                                                
        current liabilities of disposal group classified as held for sale
                                           109,298,000                                                     
        noncurrent liabilities of disposal group held for sale
                                                                                                
        goodwill and intangible assets
                                                        741,484,000 740,814,000 740,825,000 740,836,000 740,847,000 740,174,000 740,185,000 740,196,000 740,207,000 739,677,000 739,834,000 739,991,000 740,148,000 739,593,000 739,750,000 739,907,000 740,064,000 738,615,000 738,772,000 738,929,000 739,086,000 737,221,000 737,380,000 737,536,000 737,692,000 738,065,000 738,217,000 738,369,000 738,521,000 737,349,000 737,495,000 737,641,000 737,787,000 709,980,000 722,044,000 703,038,000 238,272,000 275,844,000 275,873,000 274,840,000 
        pension and postretirement costs
                                                           456,694,000                                     
        september 30, 2011 — 90,296,482 shares
                                                              450,000 448,000                                 
        december 31, 2011 — 90,007,057 shares
                                                                                                
        200,000,000 shares authorized; issued and outstanding:
                                                                                                
        june 30, 2011 — 90,284,722 shares;
                                                                                                
        september 30, 2010 — 90,164,103 shares
                                                                 451,000 452,000 453,000                             
        march 31, 2011 — 90,329,237 shares;
                                                                                                
        december 31, 2010 — 90,638,491 shares
                                                                                                
        2010 — 90,164,103 shares, 2009 — 92,551,709 shares
                                                                    451,000                            
        june 30, 2010 — 93,112,688 shares;
                                                                                                
        september 30, 2009 — 92,551,709 shares
                                                                     466,000 466,000 465,000                         
        march 31, 2010 — 93,146,535 shares;
                                                                                                
        december 31, 2009 — 92,970,838 shares;
                                                                                                
        2009 — 92,551,709 shares, 2008 — 90,814,683 shares
                                                                        463,000                        
        june 30, 2009 — 92,234,134 shares;
                                                                                                
        september 30, 2008 — 90,814,683 shares
                                                                         461,000 460,000                      
        march 31, 2009 — 91,947,614 shares;
                                                                                                
        2008 — 90,814,683 shares, 2007 — 89,326,537 shares
                                                                            454,000                    
        cash held on deposit in margin account
                                                                             62,152,000 29,591,000   13,576,000 40,763,000  35,647,000 58,176,000 13,537,000          
        december 31, 2007 — 89,906,989 shares;
                                                                                                
        september 30, 2007 — 89,326,537 shares
                                                                               450,000                 
        2007 — 89,326,537 shares, 2006 — 81,739,516 shares
                                                                                447,000                
        june 30, 2007 — 89,112,585 shares; september 30, 2006 — 81,739,516 shares
                                                                                 446,000               
        march 31, 2007 — 88,764,353 shares; september 30, 2006 — 81,739,516 shares
                                                                                  444,000              
        december 31, 2006 — 88,504,847 shares; september 30, 2006 — 81,739,516 shares
                                                                                   442,000             
        2006 — 81,739,516 shares, 2005 — 80,539,401 shares
                                                                                    409,000            
        june 30, 2006 — 81,538,149 shares; september 30, 2005 — 80,539,401 shares
                                                                                     408,000           
      Cashflow Statements:
      Quarterly
      Annual
        Unit: USD2026-03-31 2025-12-31 2025-09-30 2025-06-30 2025-03-31 2024-12-31 2024-09-30 2024-06-30 2024-03-31 2023-12-31 2023-09-30 2023-06-30 2023-03-31 2022-12-31 2022-09-30 2022-06-30 2022-03-31 2021-12-31 2021-09-30 2021-06-30 2021-03-31 2020-12-31 2020-09-30 2020-06-30 2020-03-31 2019-12-31 2019-09-30 2019-06-30 2019-03-31 2018-12-31 2018-09-30 2018-06-30 2018-03-31 2017-12-31 2017-09-30 2017-06-30 2017-03-31 2016-12-31 2016-09-30 2016-06-30 2016-03-31 2015-12-31 2015-09-30 2015-06-30 2015-03-31 2014-12-31 2014-09-30 2014-06-30 2014-03-31 2013-12-31 2013-09-30 2013-06-30 2013-03-31 2012-12-31 2012-09-30 2012-06-30 2012-03-31 2011-12-31 2011-09-30 2011-06-30 2011-03-31 2010-12-31 2010-09-30 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 2005-12-31 2005-09-30 2005-06-30 2005-03-31 2004-12-31 2004-09-30 2004-06-30 2004-03-31 2003-12-31 
                                                                                                  
          cash flows from operating activities
                                                                                                  
          net income
        581,899,000 402,964,000 174,891,000 186,429,000 485,576,000 351,858,000 134,016,000 165,564,000 432,023,000 311,292,000 118,524,000 137,807,000 357,671,000 271,860,000 71,643,000 128,547,000 324,999,000 249,209,000 48,720,000 102,411,000 296,754,000 217,678,000 65,333,000 117,791,000 239,646,000 178,673,000 58,406,000 80,466,000 214,888,000 157,646,000 38,747,000 71,193,000 178,992,000 314,132,000 35,853,000 70,808,000 164,728,000 125,032,000 34,240,000 71,193,000 141,810,000 102,861,000 23,515,000 56,281,000 137,684,000 97,595,000 23,713,000 45,721,000 133,367,000 87,016,000 7,536,000 38,768,000 116,425,000 80,465,000 7,967,000 31,132,000 109,111,000 68,507,000 1,961,000 -566,000 132,209,000 73,997,000 1,537,000 -3,154,000 114,126,000 93,330,000 -15,952,000 1,964,000 129,003,000 75,963,000 1,582,000 -6,588,000 111,534,000 73,803,000 -5,914,000 -13,360,000 106,505,000 81,261,000 6,059,000 -18,145,000 88,796,000 71,027,000 -16,802,000 4,486,000 88,502,000 59,599,000 -6,384,000 4,765,000 58,305,000 29,541,000 
          adjustments to reconcile net income to net cash from operating activities:
                                                                                                  
          depreciation and amortization expense
        195,687,000 194,645,000  185,786,000 182,750,000 180,533,000  166,827,000 165,087,000 164,608,000  150,726,000 148,317,000 146,020,000  134,231,000 133,374,000 127,856,000  119,348,000 118,636,000 115,285,000  107,104,000 105,916,000 105,062,000  97,700,000 96,772,000 96,065,000  90,671,000 89,381,000 88,374,000  80,023,000                                                       
          deferred income taxes
        135,444,000 93,044,000 53,997,000 43,644,000 99,858,000 71,107,000 34,049,000 28,560,000 65,990,000 44,108,000 32,808,000 16,347,000 29,367,000 29,693,000 12,752,000 777,000 28,309,000 11,813,000 11,160,000 15,470,000 64,138,000 64,587,000 17,326,000 27,332,000 63,938,000 46,726,000 11,784,000 23,335,000 56,546,000 40,339,000 18,419,000 23,829,000 62,874,000 53,149,000 38,927,000 39,599,000 81,416,000 67,241,000 22,514,000 38,586,000 73,157,000 59,299,000 28,259,000 33,335,000 75,874,000 55,418,000 39,495,000 30,747,000 72,583,000 47,127,000 10,971,000 23,474,000 60,940,000 45,951,000 -16,394,000 18,661,000 62,010,000 40,042,000 1,865,000 186,000 71,879,000 43,423,000 10,406,000 142,228,000 31,265,000 12,832,000 67,101,000 -35,234,000 70,717,000 27,175,000 20,076,000 5,587,000 60,299,000 11,978,000 24,855,000 -35,489,000 58,886,000 13,869,000 50,018,000 -22,039,000          19,347,000 
          other
        -11,678,000 -23,292,000 60,405,000 -16,711,000 -13,412,000 -19,279,000 40,964,000 -11,395,000 -11,184,000 -16,839,000 37,769,000 -10,864,000 -9,988,000 -17,508,000 19,206,000 -3,129,000 -123,000 -12,689,000 3,353,000 1,316,000 2,038,000 -2,976,000 2,476,000 -1,209,000 7,760,000 -616,000 -8,480,000 4,315,000 -897,000 6,231,000 -12,570,000 5,755,000 5,337,000 6,915,000 -14,795,000 4,501,000 5,549,000 4,842,000 -18,748,000 9,412,000 5,948,000 4,407,000 -18,996,000 7,814,000 5,443,000 4,889,000 -22,015,000 10,841,000 5,518,000 5,228,000 -17,347,000 8,941,000 2,277,000 3,242,000 -22,879,000 12,512,000 5,182,000 4,692,000 -16,888,000 5,672,000 5,543,000 4,712,000 -19,670,000 6,666,000 7,377,000 4,382,000 -24,186,000 9,375,000 5,951,000 7,683,000 -18,259,000 5,914,000 2,447,000 4,406,000 -19,475,000 8,487,000 4,754,000 4,718,000 6,417,000 4,476,000 8,708,000 -1,121,000 -483,000 309,000 -906,000 -1,051,000    -476,000 
          net assets / liabilities from risk management activities
        -4,131,000 6,968,000  -2,811,000 -1,046,000 1,891,000  609,000 -3,906,000 5,589,000  -63,000 -1,700,000 218,000  -2,995,000 4,662,000 -8,834,000  1,855,000 -1,138,000 -816,000  -15,000 -2,833,000 4,143,000  -1,643,000 2,125,000 -2,458,000  100,000 -1,218,000 2,030,000  -1,096,000 22,788,000 3,969,000  -17,885,000 17,023,000 -7,495,000  15,955,000 -8,263,000 -20,828,000  2,322,000 6,313,000 -5,477,000  8,323,000 932,000 -15,641,000  -2,931,000 24,116,000 -8,426,000    5,304,000        -22,793,000  -2,996,000 49,751,000 -11,586,000  -38,215,000 85,397,000 -34,857,000             
          net change in other operating assets and liabilities
        -173,732,000 -366,271,000  100,036,000 169,211,000 -304,088,000  61,026,000 98,583,000 -263,478,000  34,839,000 158,260,000 -241,383,000  31,401,000 87,439,000 -305,531,000  -1,619,000                                                                       
          net cash from operating activities
        723,489,000 308,058,000 348,124,000 496,373,000 922,937,000 282,022,000 330,682,000 411,191,000 746,593,000 245,280,000 238,235,000 328,792,000 2,703,816,000 188,900,000 48,268,000 288,832,000 578,660,000 61,824,000 74,216,000 243,779,000 -1,559,315,000 157,069,000 142,513,000 261,711,000 461,330,000 172,445,000 159,841,000 248,099,000 396,145,000 164,684,000 89,366,000 283,929,000 578,129,000 173,238,000 121,529,000 193,558,000 435,040,000 116,963,000 170,392,000 168,822,000 385,283,000 70,493,000 118,937,000 176,734,000 513,433,000 27,415,000 109,776,000 139,229,000 456,681,000 34,300,000 103,552,000 133,234,000   68,111,000 158,083,000   63,282,000 81,091,000 392,647,000 45,824,000 131,912,000 111,106,000 388,302,000 95,156,000 94,639,000 209,972,000 463,907,000 150,715,000 -46,448,000 -61,811,000 417,755,000 61,437,000 -5,575,000 40,743,000 346,958,000 164,969,000 88,006,000 75,052,000           
          cash flows from investing activities
                                                                                                  
          capital expenditures
        -1,003,588,000 -1,033,347,000 -963,612,000 -866,930,000 -839,666,000 -891,191,000 -807,987,000 -713,611,000 -645,876,000 -769,650,000 -722,487,000 -668,137,000 -619,689,000 -795,660,000 -718,381,000 -536,010,000 -505,849,000 -684,180,000 -611,580,000 -512,232,000 -388,919,000 -456,809,000 -530,003,000 -410,936,000 -465,551,000 -529,186,000 -494,278,000 -421,613,000 -361,182,000 -416,404,000 -379,119,000 -394,494,000 -310,740,000 -383,238,000 -324,941,000 -252,763,000 -261,423,000 -297,962,000 -290,942,000 -257,775,000 -246,559,000 -291,674,000 -307,649,000 -225,839,000 -180,331,000 -261,313,000 -282,651,000 -193,591,000 -178,442,000 -180,567,000 -262,560,000 -193,356,000   -235,484,000 -186,251,000   -232,682,000 -143,620,000 -123,501,000 -123,162,000 -180,287,000 -129,720,000 -117,190,000 -115,439,000 -167,168,000 -120,996,000 -113,963,000 -107,367,000 -159,395,000 -114,156,000 -104,567,000 -94,155,000 -129,412,000 -86,986,000 -102,633,000 -109,461,000           
          free cash flows
        -280,099,000 -725,289,000 -615,488,000 -370,557,000 83,271,000 -609,169,000 -477,305,000 -302,420,000 100,717,000 -524,370,000 -484,252,000 -339,345,000 2,084,127,000 -606,760,000 -670,113,000 -247,178,000 72,811,000 -622,356,000 -537,364,000 -268,453,000 -1,948,234,000 -299,740,000 -387,490,000 -149,225,000 -4,221,000 -356,741,000 -334,437,000 -173,514,000 34,963,000 -251,720,000 -289,753,000 -110,565,000 267,389,000 -210,000,000 -203,412,000 -59,205,000 173,617,000 -180,999,000 -120,550,000 -88,953,000 138,724,000 -221,181,000 -188,712,000 -49,105,000 333,102,000 -233,898,000 -172,875,000 -54,362,000 278,239,000 -146,267,000 -159,008,000 -60,122,000   -167,373,000 -28,168,000   -169,400,000 -62,529,000 269,146,000 -77,338,000 -48,375,000 -18,614,000 271,112,000 -20,283,000 -72,529,000 88,976,000 349,944,000 43,348,000 -205,843,000 -175,967,000 313,188,000 -32,718,000 -134,987,000 40,743,000 346,958,000 77,983,000 -14,627,000 -34,409,000           
          debt and equity securities activities
        -789,000 -4,530,000  -3,058,000 1,200,000 -490,000  -691,000 -932,000 -78,000  -2,742,000 -2,088,000 -2,472,000  -164,000 1,384,000 2,374,000  3,143,000 -6,017,000 511,000  439,000 471,000 -1,602,000  -4,818,000 1,740,000 -963,000                                                             
          net cash from investing activities
        -1,000,123,000 -1,035,643,000 -967,616,000 -876,128,000 -828,597,000 -888,941,000 -803,675,000 -709,830,000 -644,889,000 -764,375,000 -717,961,000 -666,929,000 -617,879,000 -792,511,000 -715,389,000 -532,600,000 -502,221,000 -679,748,000 -611,338,000 -506,254,000 -392,471,000 -453,592,000 -525,251,000 -409,030,000 -463,002,000 -528,235,000 -488,259,000 -426,980,000 -353,128,000 -415,293,000 -376,342,000 -399,080,000 -306,772,000 -381,372,000 -308,951,000 -230,685,000 -124,533,000 -392,137,000 -285,351,000 -258,036,000 -245,700,000 -290,645,000 -306,153,000 -225,612,000 -180,938,000 -262,052,000 -284,356,000 -189,307,000 -177,479,000 -186,434,000 -264,325,000 -39,772,000 -201,517,000 -191,300,000 -107,639,000 -186,620,000 -159,527,000 -155,474,000 -233,730,000 -145,458,000 -124,666,000 -123,532,000 -179,915,000 -129,212,000 -116,263,000 -117,312,000 -168,781,000 -123,165,000 -116,678,000 -108,577,000 -165,828,000 -115,327,000 -105,825,000 -96,029,000 -129,981,000 -96,349,000 -88,231,000 -88,310,000 -103,589,000 -111,430,000           
          cash flows from financing activities
                                                                                                  
          net proceeds from equity issuances
        199,624,000 472,009,000  189,113,000 379,490,000  495,965,000 254,022,000  311,947,000 139,683,000 220,000,000  81,000,000                                                                           
          issuance of common stock through stock purchase and employee retirement plans
        1,104,000 2,634,000 3,745,000 3,644,000 3,841,000 4,047,000 3,694,000 3,619,000 4,025,000 3,746,000 3,735,000 3,750,000 4,131,000 3,779,000 3,733,000 3,660,000 4,092,000 3,918,000 3,720,000 3,830,000 4,284,000 4,007,000 5,423,000 5,804,000 4,054,000 4,267,000 5,195,000 3,784,000 6,103,000 4,241,000 3,713,000 3,948,000 6,242,000 5,660,000 3,850,000 5,689,000 7,986,000 8,998,000 7,778,000                                                    
          proceeds from issuance of long-term debt
        596,532,000  498,075,000 645,372,000  341,929,000 898,275,000  797,258,000  202,660,000 596,142,000  2,199,956,000 597,390,000  200,000,000 799,450,000  448,227,000 596,994,000      759,911,000 125,000,000                                                     
          repayment of long-term debt
        -10,000,000                     -125,000,000              -500,000,000       -254,665,000 -66,000 -2,303,000 -65,000 -350,000,000 -66,000 -10,000,000 -65,000   -66,000 -406,662,000 -347,000 -278,000 -339,000 -7,692,000 -512,000 -1,741,000 -300,500,000 -479,000 -489,000 -1,717,000 -646,000 -456,000 -467,000 -1,695,000 -624,000 -98,952,000 -476,000 -3,373,000 -634,000 -3,533,000 -183,000 -5,363,000 
          repayment of securitized long-term debt by aek
          -4,024,000   -4,184,000                                                                                    
          cash dividends paid
        -164,103,000 -160,407,000 -141,449,000 -138,443,000 -138,416,000 -135,453,000 -126,231,000 -125,154,000 -121,667,000 -119,898,000 -111,271,000 -108,349,000 -106,173,000 -104,552,000 -96,658,000 -95,312,000 -93,533,000 -90,411,000 -82,644,000 -81,912,000 -80,325,000 -79,023,000 -71,770,000 -70,597,000 -70,520,000 -69,557,000 -63,735,000 -61,654,000 -61,606,000 -58,722,000 -54,899,000 -54,116,000 -54,054,000 -51,837,000 -48,856,000 -47,761,000 -47,574,000 -47,740,000 -44,763,000 -43,554,000 -43,173,000 -43,636,000 -43,373,000 -38,571,000 -38,482,000 -39,592,000 -37,442,000 -37,426,000 -37,396,000 -33,984,000 -32,055,000 -32,052,000 -32,016,000 -31,992,000 -31,458,000 -31,431,000 -31,390,000 -31,517,000 -30,972,000 -30,972,000 -31,065,000 -31,002,000 -30,374,000 -31,363,000 -31,316,000 -31,234,000 -30,551,000 -30,463,000 -30,281,000 -30,165,000 -29,467,000 -29,390,000 -29,253,000 -29,178,000 -28,546,000 -28,478,000 -28,379,000 -26,261,000 -25,716,000 -25,626,000 -25,504,000 -25,429,000 -24,930,000 -24,837,000 -24,690,000 -24,521,000 -19,121,000 -15,999,000 -15,872,000 -15,744,000 
          debt issuance costs
        -5,475,000 -244,000 -4,153,000 -5,987,000 -697,000 -2,227,000 -8,920,000 -7,864,000 -1,810,000 -6,386,000 -133,000 -9,093,000 -5,062,000 -7,738,000 -27,000 -4,795,000 -6,432,000     -112,000                                                        
          net cash from financing activities
        32,231,000 895,293,000 109,694,000 548,236,000 -138,626,000 887,469,000 102,587,000 714,132,000 -123,380,000 785,292,000 440,861,000 301,075,000 -2,162,359,000 723,654,000 390,600,000 -10,652,000 242,051,000 765,206,000 129,224,000 -78,215,000 2,359,498,000 733,314,000 195,482,000 35,284,000 132,499,000 520,512,000 306,805,000 116,691,000 -152,861,000 455,035,000 279,817,000 65,007,000 -255,033,000 236,475,000 144,054,000 61,501,000 -309,728,000 272,264,000 96,287,000 107,502,000 -170,568,000 270,402,000 172,716,000 -3,494,000 -360,802,000 316,211,000 165,417,000 -35,241,000 -337,025,000 280,498,000 194,993,000 -127,030,000 -204,020,000 221,804,000 76,061,000 9,203,000 -254,607,000 124,506,000 184,438,000 28,550,000 -244,627,000 75,648,000 -428,000 -32,664,000 -215,715,000 85,782,000 59,610,000 -443,157,000 65,057,000 -19,056,000 212,492,000 84,003,000 -224,168,000 25,741,000 -154,102,000 229,709,000 -176,853,000 -58,068,000 64,549,000 14,328,000           
          net increase in cash and cash equivalents and restricted cash and cash equivalents
        -244,403,000 167,708,000 -509,798,000 168,481,000 -44,286,000 280,550,000 -370,406,000 415,493,000 -21,676,000 266,197,000 -38,865,000                                                                                
          cash and cash equivalents and restricted cash and cash equivalents at beginning of period
        203,803,000  308,856,000  19,248,000                                                                                 
          cash and cash equivalents and restricted cash and cash equivalents at end of period
        -244,403,000 371,511,000  168,481,000 -44,286,000 589,406,000  415,493,000 -21,676,000 285,445,000                                                                                 
          depreciation and amortization
                                             77,143,000                                                     
          stock-based compensation
                                                                                                  
          amortization of debt issuance costs
                                                                                                  
          equity component of afudc
                                                                                                  
          changes in assets and liabilities:
                                                                                                  
          decrease in accounts receivable
                                                                                                  
          decrease in gas stored underground
                                                                                                  
          decrease in winter storm uri current regulatory asset
                                                                                                  
          decrease in other current assets
                                                                                                  
          increase in deferred charges and other assets
                                                                                                  
          increase in accounts payable and accrued liabilities
                                                                                                  
          increase in other current liabilities
                                                                                                  
          increase in deferred credits and other liabilities
                                                                                                  
          purchases of debt and equity securities
                                                                                                  
          proceeds from sale of debt and equity securities
                                                                                                  
          maturities of debt securities
                                                                                                  
          net increase in short-term debt
                                         -110,929,000 189,172,000 -412,034,000 -270,140,000 110,936,000 159,345,000 43,537,000 -136,307,000 305,309,000 205,950,000 26,991,000 -328,735,000 350,574,000    320,783,000    256,933,000    173,905,000    112,628,000    111,335,000    5,312,000    50,690,000 169,174,000 -154,471,000 -227,945,000 85,329,000 34,772,000 -211,744,000 329,250,000    28,797,000    73,200,000 
          proceeds from issuance of long-term debt, net of premium/discount
                                                                                                  
          proceeds from issuance of securitized long-term debt by aek
                                                                                                 
          net proceeds from equity offering
                         261,943,000 145,989,000 244,676,000 216,002,000 266,255,000 100,000,000 -958,000 259,005,000 100,372,000 99,646,000 -649,000 494,734,000 -7,000 395,099,000 49,355,000 49,400,000 -86,000                                  -348,000 192,261,000     -430,000 382,014,000     
          settlement of interest rate swaps
                                                                                                
          proceeds from term loan
                                                                                                
          repayment of term loan
                                                                                                
          securitized debt issuance costs
                                                                                                 
          cash and cash equivalents and restricted cash and cash equivalents at beginning of year
                                                                                                  
          cash and cash equivalents and restricted cash and cash equivalents at end of year
                                                                                                  
          net decrease in short-term debt
               -241,933,000  -184,967,000          -199,923,000 199,923,000 -464,915,000  74,942,000 -575,780,000  115,175,000                2,410,000    -92,943,000    42,257,000    -3,188,000    -112,000    -12,981,000    114,861,000                   
          decrease in deferred charges and other assets
                                                                                                  
          net change in winter storm uri current regulatory asset
                                                                                                 
          repayment of securitized debt
                                                                                                  
          increase in other current assets
                                                                                                  
          increase in winter storm uri long-term regulatory asset
                                                                                                  
          net increase in cash and cash equivalents
                    -76,422,000 120,043,000 -276,521,000 -254,420,000 318,490,000 147,282,000 -407,898,000 -340,690,000 407,712,000 436,791,000 -187,256,000 -112,035,000 130,827,000 164,722,000 -21,613,000 -62,190,000 -109,844,000 204,426,000 -7,159,000 -50,144,000 16,324,000 28,341,000 -43,368,000 24,374,000 779,000 -2,910,000 -18,672,000 18,288,000 -30,985,000 50,250,000 -14,500,000 -52,372,000 -28,307,000 81,574,000   -57,823,000 128,364,000   -59,054,000 60,362,000     13,990,000 -35,817,000 23,354,000 -2,060,000 -48,431,000 -50,770,000 56,324,000 63,626,000 -14,532,000 -356,350,000 412,286,000 23,082,000 216,000 -93,135,000 87,762,000 -8,851,000 -289,658,000 174,103,000 81,874,000 18,591,000   -552,000 9,335,000 16,479,000 -223,489,000 221,964,000 -176,770,000 75,037,000 11,912,000 73,273,000 26,027,000 
          cash and cash equivalents at beginning of period
                    51,554,000  116,723,000  20,808,000  24,550,000  13,771,000  26,409,000  47,534,000  28,653,000  42,258,000  66,199,000  64,239,000  131,419,000  131,952,000  111,203,000  46,717,000  60,725,000  75,815,000  40,116,000  201,932,000  15,683,000 
          cash and cash equivalents at end of period
                    -76,422,000 171,597,000  -254,420,000 318,490,000 264,005,000  -340,690,000 407,712,000 457,599,000  -112,035,000 130,827,000 189,272,000  -62,190,000 -109,844,000 218,197,000  -50,144,000 16,324,000 54,750,000  24,374,000 779,000 44,624,000  18,288,000 -30,985,000 78,903,000  -52,372,000 -28,307,000 123,832,000  -85,319,000 -57,823,000 194,563,000  -33,568,000 -59,054,000 124,601,000  -19,334,000 -38,120,000 85,160,000  -35,817,000 23,354,000 129,892,000  -50,770,000 56,324,000 174,829,000  -356,350,000 412,286,000 69,799,000  -93,135,000 87,762,000 51,874,000  174,103,000 81,874,000 94,406,000  -22,050,000 -552,000 49,451,000  -223,489,000 221,964,000 25,162,000  11,912,000 73,273,000 41,710,000 
          one-time income tax benefit
                                     6,740,000 153,000 -3,791,000 -161,884,000                                                         
          increase in winter storm uri current regulatory asset
                                                                                                  
          decrease in other current liabilities
                                                                                                  
          cash and cash equivalents at beginning of year
                                                                                                  
          cash and cash equivalents at end of year
                                                                                                  
          net change in winter storm uri long-term regulatory asset
                                                                                                  
          proceeds from the sale of discontinued operations
                                      6,693,000                                                      
          net change in winter storm uri regulatory asset
                           4,998,000                                                                       
          net change in operating assets and liabilities
                             -236,689,000  31,670,000 46,903,000 -161,543,000  43,926,000 26,711,000 -133,139,000  92,228,000 246,554,000 -129,478,000  -277,000 95,823,000 -150,685,000  -6,281,000 75,054,000 -160,144,000  -5,382,000 234,382,000 -177,527,000  -14,585,000 177,373,000 -160,284,000  3,621,000 107,664,000 -144,787,000  37,250,000 113,671,000 -180,917,000  4,722,000 129,328,000 -137,819,000  -90,137,000 154,269,000 -42,372,000  131,746,000 176,170,000 9,553,000  -114,123,000 144,890,000 -65,700,000  70,316,000 40,315,000 50,900,000  43,796,000          -56,490,000 
          gain on sale of discontinued operations
                                                                                               
          discontinued cash flow hedging for commodity contracts
                                                                                                  
          acquisition
                                          -414,000 -85,714,000                                                     
          use tax refund
                                          11,228,000                                                        
          interest rate swaps cash collateral
                                                                                                  
          debt financing costs
                                                                                                  
          purchases of available-for-sale securities
                                                                                                  
          proceeds from sale of available-for-sale securities
                                                                                                  
          maturities of available-for-sale securities
                                                                                                  
          settlement of interest rate agreements
                                                  13,364,000                                             
          interest rate agreements cash collateral
                                          25,670,000                                                     
          cash paid during the period for:
                                                                                                  
          interest
                                                                                                  
          income taxes
                                                                                                  
          discontinued cash flow hedging for natural gas marketing commodity contracts
                                          -10,579,000                                                     
          available-for-sale securities activities
                                       -6,682,000 -1,040,000 -135,000  -5,411,000 1,345,000 -10,263,000                                                     
          repurchase of equity awards
                                                  -7,985,000 -2,400,000 -28,000 -6,289,000 -4,000 -2,022,000 -3,124,000 -1,710,000 -389,000 -3,120,000 1,000 -1,967,000 -102,000 -3,231,000 -18,000                            
          proceeds from issuance of long-term debt, net of discount
                                                                                                  
          depreciation and amortization:
                                                                                                  
          charged to depreciation and amortization
                                               73,459,000 71,972,000 71,239,000 70,737,000 68,444,000 68,022,000 67,593,000 68,256,000 63,955,000 61,307,000 60,469,000 60,191,000 58,129,000 58,108,000 60,500,000 62,209,000 61,352,000 61,799,000 60,733,000 61,429,000 58,429,000 57,136,000 56,161,000 56,753,000 53,288,000 53,080,000 53,839,000 56,451,000 54,181,000 53,450,000 53,126,000 52,783,000 50,356,000 48,790,000 48,513,000 49,828,000 48,974,000 51,066,000 48,995,000 48,422,000 46,838,000           
          charged to other accounts
                                               338,000 319,000 326,000 356,000 287,000 291,000 275,000 300,000 228,000 220,000 221,000 233,000 181,000 137,000 128,000 174,000 107,000 125,000 78,000 79,000 51,000 52,000 46,000 57,000 20,000 60,000 36,000 34,000 39,000 13,000 8,000 41,000 39,000 44,000 23,000 44,000 30,000 35,000 83,000 12,000 25,000           
          net proceeds from issuance of long-term debt
                                                  493,538,000           -152,000                        1,385,847,000   
          issuance of common stock
                                                8,912,000 8,729,000 10,139,000 8,086,000 6,415,000 6,312,000 2,122,000    38,000 -13,000 34,000 -13,000 1,355,000 87,000 88,000 76,000 248,000 -20,000 315,000 7,253,000 192,000 -16,000 2,909,000 5,681,000 7,759,000 7,514,000 6,339,000 6,075,000 6,403,000 6,224,000 6,869,000 5,970,000 6,014,000 6,455,000 6,834,000 5,594,000 5,582,000 5,638,000 5,889,000 6,164,000 4,977,000 6,181,000 14,909,000 11,116,000 8,425,000 8,696,000 10,181,000 7,413,000 
          decrease in deferred credits and other liabilities
                                                                                                  
          settlement of treasury lock agreements
                                                                                       -43,770,000     
          asset impairments
                                                                                                 
          increase in accounts receivable
                                                                                                  
          increase in gas stored underground
                                                                                                  
          cash flows used in investing activities
                                                                                                  
          repurchase of common stock
                                                              -12,535,000                                 
          cash paid (received) during the period for:
                                                                                                  
          net decrease in cash and cash equivalents
                                                                 -46,259,000                                 
          unwinding of treasury lock agreements
                                                                                                
          adjustments to reconcile net income to net cash provided (used) by operating activities:
                                                                                                  
          net cash provided (used) by operating activities
                                                             29,858,000    -15,291,000                                 
          asset impairment
                                                                                                  
          net assets/liabilities from risk management activities
                                                                   1,609,000     28,125,000 -26,891,000  47,901,000                      -4,564,000 
          settlement of treasury lock agreement
                                                                                                
          adjustments to reconcile net income to net cash
                                                                                                  
          provided by operating activities:
                                                                                                  
          adjustments to reconcile net income to net cash provided
                                                                                                  
          by operating activities:
                                                                                                  
          net proceeds from debt offering
                                                                           -565,000                       
          impairment of long-lived assets
                                                                                                  
          decrease in cash held on deposit in margin account
                                                                                                  
          net proceeds from long-term debt offering
                                                                                                  
          acquisitions, net of cash received
                                                                                                  
          cash flows from investing activities capital expenditures
                                                                                                  
          gain on sales of assets
                                                                                                  
          proceeds from sales of assets
                                                                                                 
          acquisitions
                                                                                           -4,122,000 -1,912,532,000  -7,000   
          adjustments to reconcile net income to net cash (used in) provided by operating activities:
                                                                                                  
          proceeds from bridge loan
                                                                                                  
          repayment of bridge loan
                                                                                                  
          repayment of mississippi valley gas debt
                                                                                                  
          proceeds from the sale of assets
                                                                                                  
          adjustments to reconcile net income to net cash provided by operating activities:
                                                                                                  
          retirements of property, plant and equipment
                                                                                              -65,000 -3,383,000 2,389,000 489,000 
          assets for leasing activities