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SEGMENT INFORMATION - Schedule of Segment Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2023 | Jun. 30, 2023 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenues |  |  | $ 11,910,705 | $ 12,289,336 | $ 9,863,085
Depreciation and Amortization |  |  | (815,700) | (1,643,100) | (1,335,000)
Other Operating Expenses |  |  | (8,695,700) | (8,448,000) | (6,534,800)
Operating Income |  |  | 2,399,335 | 2,198,154 | 1,993,321
Interest Expense |  |  | (855,441) | (678,274) | (582,334)
Impairments of Offshore Wind Investments | $ (1,766,000) | $ (401,000) | (2,167,000) | 0 | 0
Interest Income |  |  | 94,200 | 50,500 | 25,600
Other Income, Net |  |  | 253,900 | 295,600 | 135,700
Income Tax (Expense)/Benefit |  |  | (159,684) | (453,574) | (344,223)
Net (Loss)/Income |  |  | (434,700) | 1,412,400 | 1,228,000
Net Income Attributable to Noncontrolling Interests |  |  | (7,519) | (7,519) | (7,519)
Net Income Attributable to Common Shareholders |  |  | (442,240) | 1,404,875 | 1,220,527
Total Assets (as of) | 55,612,245 |  | 55,612,245 | 53,230,900 |
Cash Flows Used for Investments in Plant |  |  | 4,336,800 | 3,441,900 | 3,175,100
Operating Segments | Electric Distribution |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenues |  |  | 8,973,500 | 9,405,300 | 7,423,600
Depreciation and Amortization |  |  | (18,200) | (970,400) | (737,800)
Other Operating Expenses |  |  | (8,104,600) | (7,663,700) | (5,970,000)
Operating Income |  |  | 850,700 | 771,200 | 715,800
Interest Expense |  |  | (291,700) | (253,100) | (236,400)
Impairments of Offshore Wind Investments |  |  | 0 |  |
Interest Income |  |  | 74,500 | 45,100 | 20,700
Other Income, Net |  |  | 136,200 | 180,400 | 78,100
Income Tax (Expense)/Benefit |  |  | (157,100) | (146,200) | (103,500)
Net (Loss)/Income |  |  | 612,600 | 597,400 | 474,700
Net Income Attributable to Noncontrolling Interests |  |  | (4,600) | (4,600) | (4,600)
Net Income Attributable to Common Shareholders |  |  | 608,000 | 592,800 | 470,100
Total Assets (as of) | 29,426,400 |  | 29,426,400 | 27,365,000 |
Cash Flows Used for Investments in Plant |  |  | 1,668,100 | 1,172,600 | 1,053,300
Operating Segments | Natural Gas Distribution |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenues |  |  | 2,221,700 | 2,215,600 | 1,789,600
Depreciation and Amortization |  |  | (214,200) | (157,600) | (142,300)
Other Operating Expenses |  |  | (1,662,600) | (1,727,000) | (1,345,400)
Operating Income |  |  | 344,900 | 331,000 | 301,900
Interest Expense |  |  | (85,700) | (71,400) | (58,600)
Impairments of Offshore Wind Investments |  |  | 0 |  |
Interest Income |  |  | 18,200 | 10,200 | 4,500
Other Income, Net |  |  | 20,400 | 33,600 | 17,900
Income Tax (Expense)/Benefit |  |  | (73,000) | (69,200) | (60,900)
Net (Loss)/Income |  |  | 224,800 | 234,200 | 204,800
Net Income Attributable to Noncontrolling Interests |  |  | 0 | 0 | 0
Net Income Attributable to Common Shareholders |  |  | 224,800 | 234,200 | 204,800
Total Assets (as of) | 8,775,300 |  | 8,775,300 | 8,084,900 |
Cash Flows Used for Investments in Plant |  |  | 844,100 | 710,300 | 721,100
Operating Segments | Electric Transmission |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenues |  |  | 1,915,900 | 1,808,700 | 1,634,600
Depreciation and Amortization |  |  | (371,200) | (337,400) | (300,300)
Other Operating Expenses |  |  | (550,500) | (548,400) | (496,200)
Operating Income |  |  | 994,200 | 922,900 | 838,100
Interest Expense |  |  | (163,700) | (145,500) | (133,200)
Impairments of Offshore Wind Investments |  |  | 0 |  |
Interest Income |  |  | 400 | 500 | 2,200
Other Income, Net |  |  | 41,200 | 37,900 | 19,800
Income Tax (Expense)/Benefit |  |  | (225,800) | (216,300) | (179,400)
Net (Loss)/Income |  |  | 646,300 | 599,500 | 547,500
Net Income Attributable to Noncontrolling Interests |  |  | (2,900) | (2,900) | (2,900)
Net Income Attributable to Common Shareholders |  |  | 643,400 | 596,600 | 544,600
Total Assets (as of) | 14,806,500 |  | 14,806,500 | 13,369,500 |
Cash Flows Used for Investments in Plant |  |  | 1,406,300 | 1,144,000 | 1,024,100
Operating Segments | Water Distribution |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenues |  |  | 232,500 | 222,500 | 211,300
Depreciation and Amortization |  |  | (56,000) | (50,900) | (46,100)
Other Operating Expenses |  |  | (117,100) | (111,800) | (101,400)
Operating Income |  |  | 59,400 | 59,800 | 63,800
Interest Expense |  |  | (38,500) | (34,700) | (32,000)
Impairments of Offshore Wind Investments |  |  | 0 |  |
Interest Income |  |  | 0 | 0 | 0
Other Income, Net |  |  | 5,900 | 8,500 | 3,300
Income Tax (Expense)/Benefit |  |  | 6,300 | 3,200 | 1,700
Net (Loss)/Income |  |  | 33,100 | 36,800 | 36,800
Net Income Attributable to Noncontrolling Interests |  |  | 0 | 0 | 0
Net Income Attributable to Common Shareholders |  |  | 33,100 | 36,800 | 36,800
Total Assets (as of) | 2,944,800 |  | 2,944,800 | 2,783,800 |
Cash Flows Used for Investments in Plant |  |  | 167,000 | 154,400 | 137,200
Other |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenues |  |  | 1,636,600 | 1,435,500 | 1,354,000
Depreciation and Amortization |  |  | (158,800) | (132,600) | (113,100)
Other Operating Expenses |  |  | (1,329,800) | (1,189,100) | (1,170,400)
Operating Income |  |  | 148,000 | 113,800 | 70,500
Interest Expense |  |  | (425,300) | (247,800) | (168,800)
Impairments of Offshore Wind Investments |  |  | (2,167,000) |  |
Interest Income |  |  | 150,600 | 66,300 | 46,000
Other Income, Net |  |  | (261,800) | 1,600,800 | 1,363,900
Income Tax (Expense)/Benefit |  |  | 289,900 | (25,100) | (2,100)
Net (Loss)/Income |  |  | (2,265,600) | 1,508,000 | 1,309,500
Net Income Attributable to Noncontrolling Interests |  |  | 0 | 0 | 0
Net Income Attributable to Common Shareholders |  |  | (2,265,600) | 1,508,000 | 1,309,500
Total Assets (as of) | 26,337,700 |  | 26,337,700 | 26,365,200 |
Cash Flows Used for Investments in Plant |  |  | 251,300 | 260,600 | 239,400
Eliminations |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenues |  |  | (3,069,500) | (2,798,300) | (2,550,000)
Depreciation and Amortization |  |  | 2,700 | 5,800 | 4,600
Other Operating Expenses |  |  | 3,068,900 | 2,792,000 | 2,548,600
Operating Income |  |  | 2,100 | (500) | 3,200
Interest Expense |  |  | 149,500 | 74,200 | 46,600
Impairments of Offshore Wind Investments |  |  | 0 |  |
Interest Income |  |  | (149,500) | (71,600) | (47,800)
Other Income, Net |  |  | 312,000 | (1,565,600) | (1,347,300)
Income Tax (Expense)/Benefit |  |  | 0 | 0 | 0
Net (Loss)/Income |  |  | 314,100 | (1,563,500) | (1,345,300)
Net Income Attributable to Noncontrolling Interests |  |  | 0 | 0 | 0
Net Income Attributable to Common Shareholders |  |  | 314,100 | (1,563,500) | (1,345,300)
Total Assets (as of) | $ (26,678,500) |  | (26,678,500) | (24,737,500) |
Cash Flows Used for Investments in Plant |  |  | $ 0 | $ 0 | $ 0

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