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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Allowance for Uncollectible Accounts (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning Balance | $ 554,500 | $ 486,300 | $ 417,400
Uncollectible Expense | 74,069 | 72,468 | 61,876
Uncollectible Costs Deferred | 119,700 | 158,200 | 112,500
Write-Offs | (203,800) | (178,100) | (124,000)
Recoveries Collected | 14,000 | 15,600 | 18,500
Decrease due to Assets Held for Sale | (2,300) |  |
Ending Balance | 556,200 | 554,500 | 486,300
Hardship Accounts |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning Balance | 366,800 | 284,400 | 226,100
Uncollectible Expense | 0 | 0 | 0
Uncollectible Costs Deferred | 71,400 | 137,000 | 77,800
Write-Offs | (74,300) | (55,900) | (21,300)
Recoveries Collected | 700 | 1,300 | 1,800
Decrease due to Assets Held for Sale | 0 |  |
Ending Balance | 364,600 | 366,800 | 284,400
Retail (Non-Hardship), Wholesale, and Other |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning Balance | 187,700 | 201,900 | 191,300
Uncollectible Expense | 74,100 | 72,500 | 61,900
Uncollectible Costs Deferred | 48,300 | 21,200 | 34,700
Write-Offs | (129,500) | (122,200) | (102,700)
Recoveries Collected | 13,300 | 14,300 | 16,700
Decrease due to Assets Held for Sale | (2,300) |  |
Ending Balance | 191,600 | 187,700 | 201,900
CL&P |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning Balance | 296,000 | 225,300 | 181,300
Uncollectible Expense | 17,190 | 11,675 | 15,578
Uncollectible Costs Deferred | 46,800 | 126,400 | 59,500
Write-Offs | (86,000) | (73,200) | (38,300)
Recoveries Collected | 5,100 | 5,800 | 7,200
Decrease due to Assets Held for Sale | 0 |  |
Ending Balance | 279,100 | 296,000 | 225,300
CL&P | Hardship Accounts |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning Balance | 259,700 | 188,900 | 144,600
Uncollectible Expense | 0 | 0 | 0
Uncollectible Costs Deferred | 35,500 | 114,400 | 58,300
Write-Offs | (55,100) | (44,700) | (15,300)
Recoveries Collected | 600 | 1,100 | 1,300
Decrease due to Assets Held for Sale | 0 |  |
Ending Balance | 240,700 | 259,700 | 188,900
CL&P | Retail (Non-Hardship), Wholesale, and Other |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning Balance | 36,300 | 36,400 | 36,700
Uncollectible Expense | 17,200 | 11,700 | 15,600
Uncollectible Costs Deferred | 11,300 | 12,000 | 1,200
Write-Offs | (30,900) | (28,500) | (23,000)
Recoveries Collected | 4,500 | 4,700 | 5,900
Decrease due to Assets Held for Sale | 0 |  |
Ending Balance | 38,400 | 36,300 | 36,400
NSTAR Electric |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning Balance | 97,000 | 95,000 | 97,000
Uncollectible Expense | 33,607 | 22,791 | 21,550
Uncollectible Costs Deferred | 37,700 | 17,500 | 12,400
Write-Offs | (57,000) | (43,300) | (42,300)
Recoveries Collected | 3,600 | 5,000 | 6,300
Decrease due to Assets Held for Sale | 0 |  |
Ending Balance | 114,900 | 97,000 | 95,000
NSTAR Electric | Hardship Accounts |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning Balance | 43,600 | 43,700 | 43,300
Uncollectible Expense | 0 | 0 | 0
Uncollectible Costs Deferred | 16,200 | 1,500 | 1,500
Write-Offs | (4,600) | (1,600) | (1,100)
Recoveries Collected | 0 | 0 | 0
Decrease due to Assets Held for Sale | 0 |  |
Ending Balance | 55,200 | 43,600 | 43,700
NSTAR Electric | Retail (Non-Hardship), Wholesale, and Other |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning Balance | 53,400 | 51,300 | 53,700
Uncollectible Expense | 33,600 | 22,800 | 21,600
Uncollectible Costs Deferred | 21,500 | 16,000 | 10,900
Write-Offs | (52,400) | (41,700) | (41,200)
Recoveries Collected | 3,600 | 5,000 | 6,300
Decrease due to Assets Held for Sale | 0 |  |
Ending Balance | 59,700 | 53,400 | 51,300
PSNH |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning Balance | 14,300 | 29,200 | 24,300
Uncollectible Expense | 4,688 | 3,989 | 9,211
Uncollectible Costs Deferred | 5,100 | (8,700) | 2,500
Write-Offs | (10,900) | (10,900) | (7,700)
Recoveries Collected | 900 | 700 | 900
Decrease due to Assets Held for Sale | 0 |  |
Ending Balance | $ 14,100 | $ 14,300 | $ 29,200

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