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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Provision for Uncollectible Accounts (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2025 | Mar. 31, 2024
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning Balance | $ 556,200 | $ 554,500
Uncollectible Expense | 22,863 | 16,387
Uncollectible Costs Deferred | 33,200 | 38,900
Write-Offs | (50,400) | (43,600)
Recoveries Collected | 3,700 | 3,900
Ending Balance | 565,600 | 570,100
CL&P |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning Balance | 279,100 | 296,000
Uncollectible Expense | 4,671 | 3,507
Uncollectible Costs Deferred | 10,700 | 25,400
Write-Offs | (19,400) | (18,500)
Recoveries Collected | 1,100 | 1,400
Ending Balance | 276,200 | 307,800
NSTAR Electric |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning Balance | 114,900 | 97,000
Uncollectible Expense | 7,485 | 6,109
Uncollectible Costs Deferred | 9,000 | 3,600
Write-Offs | (16,800) | (10,200)
Recoveries Collected | 1,400 | 1,200
Ending Balance | 116,000 | 97,700
PSNH |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning Balance | 14,100 | 14,300
Uncollectible Expense | 1,315 | 1,163
Uncollectible Costs Deferred | 1,400 | 1,300
Write-Offs | (2,700) | (3,200)
Recoveries Collected | 200 | 200
Ending Balance | 14,300 | 13,800
Hardship Accounts |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning Balance | 364,600 | 366,800
Uncollectible Expense | 0 | 0
Uncollectible Costs Deferred | 19,400 | 27,500
Write-Offs | (12,600) | (15,100)
Recoveries Collected | 100 | 200
Ending Balance | 371,500 | 379,400
Hardship Accounts | CL&P |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning Balance | 240,700 | 259,700
Uncollectible Expense | 0 | 0
Uncollectible Costs Deferred | 8,800 | 22,700
Write-Offs | (9,300) | (10,800)
Recoveries Collected | 100 | 200
Ending Balance | 240,300 | 271,800
Hardship Accounts | NSTAR Electric |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning Balance | 55,200 | 43,600
Uncollectible Expense | 0 | 0
Uncollectible Costs Deferred | 3,500 | (800)
Write-Offs | (900) | (1,000)
Recoveries Collected | 0 | 0
Ending Balance | 57,800 | 41,800
Retail (Non-Hardship), Wholesale, and Other |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning Balance | 191,600 | 187,700
Uncollectible Expense | 22,900 | 16,400
Uncollectible Costs Deferred | 13,800 | 11,400
Write-Offs | (37,800) | (28,500)
Recoveries Collected | 3,600 | 3,700
Ending Balance | 194,100 | 190,700
Retail (Non-Hardship), Wholesale, and Other | CL&P |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning Balance | 38,400 | 36,300
Uncollectible Expense | 4,700 | 3,500
Uncollectible Costs Deferred | 1,900 | 2,700
Write-Offs | (10,100) | (7,700)
Recoveries Collected | 1,000 | 1,200
Ending Balance | 35,900 | 36,000
Retail (Non-Hardship), Wholesale, and Other | NSTAR Electric |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning Balance | 59,700 | 53,400
Uncollectible Expense | 7,500 | 6,100
Uncollectible Costs Deferred | 5,500 | 4,400
Write-Offs | (15,900) | (9,200)
Recoveries Collected | 1,400 | 1,200
Ending Balance | $ 58,200 | $ 55,900

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