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SEGMENT INFORMATION - Summary of Segment Information and Segmented Total Assets (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Jun. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating Revenues | $ 3,063,224 | $ 2,791,482 |  | $ 8,929,321 | $ 9,216,467 |
Depreciation and Amortization | (610,100) | (185,500) |  | (1,188,100) | (524,000) |
Other Operating Expenses | (1,840,700) | (2,075,400) |  | (5,680,300) | (6,851,700) |
Operating Income/(Loss) | 612,400 | 530,553 |  | 2,060,870 | 1,840,787 |
Interest Expense | (300,600) | (222,300) |  | (822,600) | (624,100) |
Loss on Offshore Wind Investments | (464,019) | 0 | $ (401,000) | (464,019) | (401,000) | $ (1,770,000)
Other Income, Net | 112,555 | 79,123 |  | 318,870 | 262,980 |
Net Income/(Loss) Attributable to Common Shareholders | (118,057) | 339,663 |  | 739,133 | 846,245 |
Cash Flows Used for Investments in Plant |  |  |  | 3,291,900 | 3,125,600 |
Assets | 58,573,319 |  |  | 58,573,319 |  | 55,612,245
Other |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating Revenues | 414,700 | 394,700 |  | 1,253,600 | 1,217,300 |
Depreciation and Amortization | (52,100) | (40,700) |  | (146,300) | (115,500) |
Other Operating Expenses | (326,600) | (315,700) |  | (990,300) | (992,600) |
Operating Income/(Loss) | 36,000 | 38,300 |  | 117,000 | 109,200 |
Interest Expense | (177,700) | (111,400) |  | (484,800) | (297,000) |
Loss on Offshore Wind Investments | (464,000) |  |  | (464,000) | (401,000) |
Other Income, Net | 48,800 | 415,900 |  | 1,145,000 | 1,082,600 |
Net Income/(Loss) Attributable to Common Shareholders | (516,500) | 397,000 |  | 375,900 | 621,600 |
Cash Flows Used for Investments in Plant |  |  |  | 180,100 | 207,100 |
Assets | 27,371,000 |  |  | 27,371,000 |  | 26,337,700
Eliminations |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating Revenues | (810,600) | (753,000) |  | (2,460,400) | (2,295,100) |
Depreciation and Amortization | 2,800 | 2,300 |  | 8,100 | 6,600 |
Other Operating Expenses | 807,800 | 751,200 |  | 2,452,300 | 2,290,000 |
Operating Income/(Loss) | 0 | 500 |  | 0 | 1,500 |
Interest Expense | 57,900 | 38,400 |  | 171,200 | 104,800 |
Loss on Offshore Wind Investments | 0 |  |  | 0 | 0 |
Other Income, Net | (31,400) | (412,700) |  | (1,094,400) | (1,038,000) |
Net Income/(Loss) Attributable to Common Shareholders | 26,500 | (373,800) |  | (923,200) | (931,700) |
Cash Flows Used for Investments in Plant |  |  |  | 0 | 0 |
Assets | (28,533,900) |  |  | (28,533,900) |  | (26,678,500)
Electric Distribution | Operating Segments |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating Revenues | 2,632,800 | 2,371,300 |  | 6,860,800 | 7,014,300 |
Depreciation and Amortization | (420,800) | (700) |  | (565,500) | 59,300 |
Other Operating Expenses | (1,910,700) | (2,124,000) |  | (5,529,300) | (6,371,400) |
Operating Income/(Loss) | 301,300 | 246,600 |  | 766,000 | 702,200 |
Interest Expense | (98,800) | (76,800) |  | (272,200) | (214,400) |
Loss on Offshore Wind Investments | 0 |  |  | 0 | 0 |
Other Income, Net | 65,800 | 53,500 |  | 189,200 | 155,700 |
Net Income/(Loss) Attributable to Common Shareholders | 203,500 | 173,300 |  | 521,300 | 504,300 |
Cash Flows Used for Investments in Plant |  |  |  | 1,309,100 | 1,230,300 |
Assets | 31,411,300 |  |  | 31,411,300 |  | 29,426,400
Natural Gas Distribution | Operating Segments |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating Revenues | 217,200 | 218,300 |  | 1,516,700 | 1,672,600 |
Depreciation and Amortization | (28,200) | (38,000) |  | (161,400) | (156,700) |
Other Operating Expenses | (216,400) | (211,100) |  | (1,066,200) | (1,280,800) |
Operating Income/(Loss) | (27,400) | (30,800) |  | 289,100 | 235,100 |
Interest Expense | (25,200) | (19,700) |  | (72,000) | (62,400) |
Loss on Offshore Wind Investments | 0 |  |  | 0 | 0 |
Other Income, Net | 11,400 | 9,200 |  | 32,500 | 27,900 |
Net Income/(Loss) Attributable to Common Shareholders | (30,200) | (33,700) |  | 187,400 | 148,200 |
Cash Flows Used for Investments in Plant |  |  |  | 697,800 | 536,800 |
Assets | 9,518,200 |  |  | 9,518,200 |  | 8,775,300
Electric Transmission | Operating Segments |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating Revenues | 542,000 | 491,600 |  | 1,583,900 | 1,430,400 |
Depreciation and Amortization | (102,000) | (94,500) |  | (301,800) | (276,400) |
Other Operating Expenses | (163,600) | (144,900) |  | (452,600) | (409,400) |
Operating Income/(Loss) | 276,400 | 252,200 |  | 829,500 | 744,600 |
Interest Expense | (48,500) | (43,000) |  | (135,400) | (126,700) |
Loss on Offshore Wind Investments | 0 |  |  | 0 | 0 |
Other Income, Net | 11,800 | 11,900 |  | 38,100 | 30,800 |
Net Income/(Loss) Attributable to Common Shareholders | 174,900 | 160,300 |  | 540,600 | 476,400 |
Cash Flows Used for Investments in Plant |  |  |  | 985,600 | 1,011,300 |
Assets | 15,750,500 |  |  | 15,750,500 |  | 14,806,500
Water Distribution | Operating Segments |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating Revenues | 67,100 | 68,600 |  | 174,700 | 177,000 |
Depreciation and Amortization | (9,800) | (13,900) |  | (21,200) | (41,300) |
Other Operating Expenses | (31,200) | (30,900) |  | (94,200) | (87,500) |
Operating Income/(Loss) | 26,100 | 23,800 |  | 59,300 | 48,200 |
Interest Expense | (8,300) | (9,800) |  | (29,400) | (28,400) |
Loss on Offshore Wind Investments | 0 |  |  | 0 | 0 |
Other Income, Net | 6,200 | 1,300 |  | 8,500 | 4,000 |
Net Income/(Loss) Attributable to Common Shareholders | 23,700 | $ 16,600 |  | 37,100 | 27,400 |
Cash Flows Used for Investments in Plant |  |  |  | 119,300 | $ 140,100 |
Assets | $ 3,056,200 |  |  | $ 3,056,200 |  | $ 2,944,800

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