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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Provision for Uncollectible Accounts (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Balance | $ 579,600 | $ 532,400 | $ 554,500 | $ 486,300
Uncollectible Expense | 29,200 | 16,800 | 55,438 | 40,945
Uncollectible Costs Deferred | 21,400 | 47,900 | 96,400 | 127,500
Write-Offs | (58,100) | (57,900) | (141,600) | (123,800)
Recoveries Collected | 2,600 | 3,500 | 10,000 | 11,800
Ending Balance | 574,700 | 542,700 | 574,700 | 542,700
CL&P |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Balance | 308,600 | 262,800 | 296,000 | 225,300
Uncollectible Expense | 5,100 | 2,400 | 11,432 | 7,106
Uncollectible Costs Deferred | (5,400) | 32,500 | 38,000 | 89,600
Write-Offs | (19,600) | (22,500) | (59,400) | (50,300)
Recoveries Collected | 1,100 | 1,100 | 3,800 | 4,600
Ending Balance | 289,800 | 276,300 | 289,800 | 276,300
NSTAR Electric |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Balance | 106,200 | 97,800 | 97,000 | 95,000
Uncollectible Expense | 15,700 | 5,200 | 27,746 | 12,988
Uncollectible Costs Deferred | 18,300 | 7,900 | 30,900 | 19,600
Write-Offs | (22,200) | (11,400) | (39,700) | (30,800)
Recoveries Collected | 300 | 1,300 | 2,400 | 4,000
Ending Balance | 118,300 | 100,800 | 118,300 | 100,800
PSNH |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Balance | 14,100 | 12,700 | 14,300 | 29,200
Uncollectible Expense | 1,200 | 2,000 | 3,420 | 1,534
Uncollectible Costs Deferred | 1,400 | 1,100 | 3,800 | (11,100)
Write-Offs | (3,200) | (3,600) | (8,400) | (7,800)
Recoveries Collected | 200 | 200 | 600 | 600
Ending Balance | 13,700 | 12,400 | 13,700 | 12,400
Hardship Accounts |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Balance | 389,100 | 338,200 | 366,800 | 284,400
Uncollectible Expense | 0 | 0 | 0 | 0
Uncollectible Costs Deferred | 5,400 | 33,900 | 58,900 | 104,700
Write-Offs | (16,800) | (17,500) | (48,500) | (35,300)
Recoveries Collected | 100 | 200 | 600 | 1,000
Ending Balance | 377,800 | 354,800 | 377,800 | 354,800
Hardship Accounts | CL&P |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Balance | 274,400 | 226,500 | 259,700 | 188,900
Uncollectible Expense | 0 | 0 | 0 | 0
Uncollectible Costs Deferred | (8,800) | 29,400 | 29,300 | 80,300
Write-Offs | (12,200) | (14,900) | (36,000) | (29,000)
Recoveries Collected | 100 | 200 | 500 | 1,000
Ending Balance | 253,500 | 241,200 | 253,500 | 241,200
Hardship Accounts | NSTAR Electric |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Balance | 45,900 | 45,600 | 43,600 | 43,700
Uncollectible Expense | 0 | 0 | 0 | 0
Uncollectible Costs Deferred | 10,100 | 3,400 | 13,600 | 5,800
Write-Offs | (1,900) | 100 | (3,100) | (400)
Recoveries Collected | 0 | 0 | 0 | 0
Ending Balance | 54,100 | 49,100 | 54,100 | 49,100
Retail (Non-Hardship), Wholesale, and Other |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Balance | 190,500 | 194,200 | 187,700 | 201,900
Uncollectible Expense | 29,200 | 16,800 | 55,400 | 40,900
Uncollectible Costs Deferred | 16,000 | 14,000 | 37,500 | 22,800
Write-Offs | (41,300) | (40,400) | (93,100) | (88,500)
Recoveries Collected | 2,500 | 3,300 | 9,400 | 10,800
Ending Balance | 196,900 | 187,900 | 196,900 | 187,900
Retail (Non-Hardship), Wholesale, and Other | CL&P |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Balance | 34,200 | 36,300 | 36,300 | 36,400
Uncollectible Expense | 5,100 | 2,400 | 11,400 | 7,100
Uncollectible Costs Deferred | 3,400 | 3,100 | 8,700 | 9,300
Write-Offs | (7,400) | (7,600) | (23,400) | (21,300)
Recoveries Collected | 1,000 | 900 | 3,300 | 3,600
Ending Balance | 36,300 | 35,100 | 36,300 | 35,100
Retail (Non-Hardship), Wholesale, and Other | NSTAR Electric |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Balance | 60,300 | 52,200 | 53,400 | 51,300
Uncollectible Expense | 15,700 | 5,200 | 27,700 | 13,000
Uncollectible Costs Deferred | 8,200 | 4,500 | 17,300 | 13,800
Write-Offs | (20,300) | (11,500) | (36,600) | (30,400)
Recoveries Collected | 300 | 1,300 | 2,400 | 4,000
Ending Balance | $ 64,200 | $ 51,700 | $ 64,200 | $ 51,700

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