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SCHEDULE I - FINANCIAL INFORMATION OF REGISTRANT - STATEMENTS OF INCOME(LOSS) (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Condensed Income Statements, Captions [Line Items] |  |  |
Operating Revenues | $ 11,900,809 | $ 11,910,705 | $ 12,289,336
Operating Expenses: |  |  |
Other | 2,012,926 | 1,895,703 | 1,865,328
Loss on Pending Sale of Aquarion | 297,000 | 0 | 0
Total Operating Expenses | 9,492,100 | 9,511,370 | 10,091,182
Operating Income (Loss) | 2,408,709 | 2,399,335 | 2,198,154
Interest Expense | 1,111,336 | 855,441 | 678,274
Other Income, Net: |  |  |
Equity in Earnings/(Losses) of Subsidiaries | 51,900 | 15,500 | 22,900
Other Income/(Loss), Net | 410,482 | 348,069 | 346,088
Income/(Loss) Before Income Tax Benefit | 1,243,836 | (275,037) | 1,865,968
Income Tax Benefit | $ 424,664 | $ 159,684 | $ 453,574
Basic Earnings/(Loss) Per Common Share (in dollars per share) | $ 2.27 | $ (1.27) | $ 4.05
Diluted Earnings/(Loss) Per Common Share (in dollars per share) | $ 2.27 | $ (1.26) | $ 4.05
Weighted Average Common Shares Outstanding: |  |  |
Basic (in shares) | 357,482,965 | 349,580,638 | 346,783,444
Diluted (in shares) | 357,779,408 | 349,840,481 | 347,246,768
Eversource |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |
Operating Revenues | $ 4,442 | $ 840 | $ 0
Operating Expenses: |  |  |
Other | 20 | 12,769 | 26,708
Loss on Pending Sale of Aquarion | 297,000 | 0 | 0
Total Operating Expenses | 297,020 | 12,769 | 26,708
Operating Income (Loss) | (292,578) | (11,929) | (26,708)
Interest Expense | 549,511 | 397,281 | 237,773
Other Income, Net: |  |  |
Equity in Earnings/(Losses) of Subsidiaries | 1,359,297 | (312,040) | 1,565,474
Other, Net | 214,444 | 188,003 | 79,383
Other Income/(Loss), Net | 1,573,741 | (124,037) | 1,644,857
Income/(Loss) Before Income Tax Benefit | 731,652 | (533,247) | 1,380,376
Income Tax Benefit | (80,001) | (91,007) | (24,499)
Net Income/(Loss) | $ 811,653 | $ (442,240) | $ 1,404,875
Basic Earnings/(Loss) Per Common Share (in dollars per share) | $ 2.27 | $ (1.27) | $ 4.05
Diluted Earnings/(Loss) Per Common Share (in dollars per share) | $ 2.27 | $ (1.26) | $ 4.05
Weighted Average Common Shares Outstanding: |  |  |
Basic (in shares) | 357,482,965 | 349,580,638 | 346,783,444
Diluted (in shares) | 357,779,408 | 349,840,481 | 347,246,768

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