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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, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Balance | $ 532,400 | $ 457,800 | $ 486,300 | $ 417,400
Uncollectible Expense | 16,800 | 10,700 | 40,945 | 40,753
Uncollectible Costs Deferred | 47,900 | 25,000 | 127,500 | 74,700
Write-Offs | (57,900) | (39,700) | (123,800) | (89,800)
Recoveries Collected | 3,500 | 3,800 | 11,800 | 14,500
Ending Balance | 542,700 | 457,600 | 542,700 | 457,600
CL&P |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Balance | 262,800 | 192,700 | 225,300 | 181,300
Uncollectible Expense | 2,400 | 4,100 | 7,106 | 10,816
Uncollectible Costs Deferred | 32,500 | 13,300 | 89,600 | 24,300
Write-Offs | (22,500) | (12,700) | (50,300) | (23,800)
Recoveries Collected | 1,100 | 1,200 | 4,600 | 6,000
Ending Balance | 276,300 | 198,600 | 276,300 | 198,600
NSTAR Electric |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Balance | 97,800 | 100,500 | 95,000 | 97,000
Uncollectible Expense | 5,200 | 3,500 | 12,988 | 12,159
Uncollectible Costs Deferred | 7,900 | 6,800 | 19,600 | 16,700
Write-Offs | (11,400) | (12,600) | (30,800) | (31,300)
Recoveries Collected | 1,300 | 1,300 | 4,000 | 4,900
Ending Balance | 100,800 | 99,500 | 100,800 | 99,500
PSNH |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Balance | 12,700 | 27,300 | 29,200 | 24,300
Uncollectible Expense | 2,000 | 3,500 | 1,534 | 8,060
Uncollectible Costs Deferred | 1,100 | 100 | (11,100) | 1,200
Write-Offs | (3,600) | (2,300) | (7,800) | (5,400)
Recoveries Collected | 200 | 200 | 600 | 600
Ending Balance | 12,400 | 28,800 | 12,400 | 28,800
Hardship Accounts |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Balance | 338,200 | 242,700 | 284,400 | 226,100
Uncollectible Expense | 0 | 0 | 0 | 0
Uncollectible Costs Deferred | 33,900 | 15,600 | 104,700 | 38,000
Write-Offs | (17,500) | (6,500) | (35,300) | (13,500)
Recoveries Collected | 200 | 300 | 1,000 | 1,500
Ending Balance | 354,800 | 252,100 | 354,800 | 252,100
Hardship Accounts | CL&P |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Balance | 226,500 | 152,100 | 188,900 | 144,600
Uncollectible Expense | 0 | 0 | 0 | 0
Uncollectible Costs Deferred | 29,400 | 11,300 | 80,300 | 22,300
Write-Offs | (14,900) | (5,000) | (29,000) | (9,400)
Recoveries Collected | 200 | 200 | 1,000 | 1,100
Ending Balance | 241,200 | 158,600 | 241,200 | 158,600
Hardship Accounts | NSTAR Electric |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Balance | 45,600 | 45,000 | 43,700 | 43,300
Uncollectible Expense | 0 | 0 | 0 | 0
Uncollectible Costs Deferred | 3,400 | 2,800 | 5,800 | 4,900
Write-Offs | 100 | (300) | (400) | (700)
Recoveries Collected | 0 | 0 | 0 | 0
Ending Balance | 49,100 | 47,500 | 49,100 | 47,500
Retail (Non-Hardship), Wholesale, and Other |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Balance | 194,200 | 215,100 | 201,900 | 191,300
Uncollectible Expense | 16,800 | 10,700 | 40,900 | 40,800
Uncollectible Costs Deferred | 14,000 | 9,400 | 22,800 | 36,700
Write-Offs | (40,400) | (33,200) | (88,500) | (76,300)
Recoveries Collected | 3,300 | 3,500 | 10,800 | 13,000
Ending Balance | 187,900 | 205,500 | 187,900 | 205,500
Retail (Non-Hardship), Wholesale, and Other | CL&P |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Balance | 36,300 | 40,600 | 36,400 | 36,700
Uncollectible Expense | 2,400 | 4,100 | 7,100 | 10,800
Uncollectible Costs Deferred | 3,100 | 2,000 | 9,300 | 2,000
Write-Offs | (7,600) | (7,700) | (21,300) | (14,400)
Recoveries Collected | 900 | 1,000 | 3,600 | 4,900
Ending Balance | 35,100 | 40,000 | 35,100 | 40,000
Retail (Non-Hardship), Wholesale, and Other | NSTAR Electric |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Balance | 52,200 | 55,500 | 51,300 | 53,700
Uncollectible Expense | 5,200 | 3,500 | 13,000 | 12,200
Uncollectible Costs Deferred | 4,500 | 4,000 | 13,800 | 11,800
Write-Offs | (11,500) | (12,300) | (30,400) | (30,600)
Recoveries Collected | 1,300 | 1,300 | 4,000 | 4,900
Ending Balance | $ 51,700 | $ 52,000 | $ 51,700 | $ 52,000

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