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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Provision for Uncollectible Accounts (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Balance | $ 535,100 | $ 432,200 | $ 486,300 | $ 417,400
Uncollectible Expense | 1,400 | 12,900 | 24,171 | 30,032
Uncollectible Costs Deferred | 21,500 | 34,000 | 79,500 | 49,700
Write-Offs | (29,900) | (25,700) | (65,800) | (50,000)
Recoveries Collected | 4,300 | 4,400 | 8,200 | 10,700
Ending Balance | 532,400 | 457,800 | 532,400 | 457,800
CL&P |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Balance | 253,400 | 180,500 | 225,300 | 181,300
Uncollectible Expense | 900 | 2,900 | 4,750 | 6,701
Uncollectible Costs Deferred | 20,000 | 17,200 | 57,000 | 11,000
Write-Offs | (13,500) | (9,500) | (27,800) | (11,100)
Recoveries Collected | 2,000 | 1,600 | 3,500 | 4,800
Ending Balance | 262,800 | 192,700 | 262,800 | 192,700
NSTAR Electric |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Balance | 94,600 | 94,800 | 95,000 | 97,000
Uncollectible Expense | 3,100 | 4,000 | 7,759 | 8,688
Uncollectible Costs Deferred | 7,600 | 7,800 | 11,700 | 9,900
Write-Offs | (8,700) | (7,800) | (19,400) | (18,700)
Recoveries Collected | 1,200 | 1,700 | 2,700 | 3,600
Ending Balance | 97,800 | 100,500 | 97,800 | 100,500
PSNH |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Balance | 33,500 | 26,200 | 29,200 | 24,300
Uncollectible Expense | (5,500) | 2,000 | (451) | 4,544
Uncollectible Costs Deferred | (13,500) | 100 | (12,200) | 1,100
Write-Offs | (2,000) | (1,300) | (4,200) | (3,100)
Recoveries Collected | 200 | 300 | 400 | 500
Ending Balance | 12,700 | 27,300 | 12,700 | 27,300
Hardship Accounts |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Balance | 318,700 | 225,500 | 284,400 | 226,100
Uncollectible Expense | 0 | 0 | 0 | 0
Uncollectible Costs Deferred | 27,000 | 21,400 | 70,800 | 22,400
Write-Offs | (8,100) | (4,600) | (17,800) | (6,900)
Recoveries Collected | 600 | 400 | 800 | 1,100
Ending Balance | 338,200 | 242,700 | 338,200 | 242,700
Hardship Accounts | CL&P |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Balance | 216,200 | 140,100 | 188,900 | 144,600
Uncollectible Expense | 0 | 0 | 0 | 0
Uncollectible Costs Deferred | 16,600 | 15,000 | 50,900 | 11,000
Write-Offs | (6,800) | (3,300) | (14,100) | (4,400)
Recoveries Collected | 500 | 300 | 800 | 900
Ending Balance | 226,500 | 152,100 | 226,500 | 152,100
Hardship Accounts | NSTAR Electric |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Balance | 42,000 | 39,700 | 43,700 | 43,300
Uncollectible Expense | 0 | 0 | 0 | 0
Uncollectible Costs Deferred | 3,700 | 5,400 | 2,400 | 2,100
Write-Offs | (100) | (100) | (500) | (400)
Recoveries Collected | 0 | 0 | 0 | 0
Ending Balance | 45,600 | 45,000 | 45,600 | 45,000
Retail (Non-Hardship), Wholesale, and Other |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Balance | 216,400 | 206,700 | 201,900 | 191,300
Uncollectible Expense | 1,400 | 12,900 | 24,200 | 30,000
Uncollectible Costs Deferred | (5,500) | 12,600 | 8,700 | 27,300
Write-Offs | (21,800) | (21,100) | (48,000) | (43,100)
Recoveries Collected | 3,700 | 4,000 | 7,400 | 9,600
Ending Balance | 194,200 | 215,100 | 194,200 | 215,100
Retail (Non-Hardship), Wholesale, and Other | CL&P |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Balance | 37,200 | 40,400 | 36,400 | 36,700
Uncollectible Expense | 900 | 2,900 | 4,800 | 6,700
Uncollectible Costs Deferred | 3,400 | 2,200 | 6,100 | 0
Write-Offs | (6,700) | (6,200) | (13,700) | (6,700)
Recoveries Collected | 1,500 | 1,300 | 2,700 | 3,900
Ending Balance | 36,300 | 40,600 | 36,300 | 40,600
Retail (Non-Hardship), Wholesale, and Other | NSTAR Electric |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Balance | 52,600 | 55,100 | 51,300 | 53,700
Uncollectible Expense | 3,100 | 4,000 | 7,800 | 8,700
Uncollectible Costs Deferred | 3,900 | 2,400 | 9,300 | 7,800
Write-Offs | (8,600) | (7,700) | (18,900) | (18,300)
Recoveries Collected | 1,200 | 1,700 | 2,700 | 3,600
Ending Balance | $ 52,200 | $ 55,500 | $ 52,200 | $ 55,500

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