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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, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Balance | $ 432,200 | $ 391,700 | $ 417,400 | $ 358,900
Uncollectible Expense | 12,900 | 11,400 | 30,032 | 27,683
Uncollectible Costs Deferred | 34,000 | 41,100 | 49,700 | 73,600
Write-Offs | (25,700) | (21,500) | (50,000) | (41,500)
Recoveries Collected | 4,400 | 3,100 | 10,700 | 7,100
Ending Balance | 457,800 | 425,800 | 457,800 | 425,800
CL&P |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Balance | 180,500 | 175,100 | 181,300 | 157,400
Uncollectible Expense | 2,900 | 2,800 | 6,701 | 6,614
Uncollectible Costs Deferred | 17,200 | 17,600 | 11,000 | 36,900
Write-Offs | (9,500) | (7,700) | (11,100) | (14,500)
Recoveries Collected | 1,600 | 1,000 | 4,800 | 2,400
Ending Balance | 192,700 | 188,800 | 192,700 | 188,800
NSTAR Electric |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Balance | 94,800 | 89,300 | 97,000 | 91,600
Uncollectible Expense | 4,000 | 3,500 | 8,688 | 7,394
Uncollectible Costs Deferred | 7,800 | 11,800 | 9,900 | 11,700
Write-Offs | (7,800) | (7,800) | (18,700) | (15,500)
Recoveries Collected | 1,700 | 1,200 | 3,600 | 2,800
Ending Balance | 100,500 | 98,000 | 100,500 | 98,000
PSNH |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Balance | 26,200 | 17,300 | 24,300 | 17,200
Uncollectible Expense | 2,000 | 2,000 | 4,544 | 3,226
Uncollectible Costs Deferred | 100 | (300) | 1,100 | 800
Write-Offs | (1,300) | (2,000) | (3,100) | (4,500)
Recoveries Collected | 300 | 200 | 500 | 500
Ending Balance | 27,300 | 17,200 | 27,300 | 17,200
Hardship Accounts |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Balance | 225,500 | 197,300 | 226,100 | 194,800
Uncollectible Expense | 0 | 0 | 0 | 0
Uncollectible Costs Deferred | 21,400 | 16,600 | 22,400 | 22,000
Write-Offs | (4,600) | (3,400) | (6,900) | (6,700)
Recoveries Collected | 400 | 200 | 1,100 | 600
Ending Balance | 242,700 | 210,700 | 242,700 | 210,700
Hardship Accounts | CL&P |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Balance | 140,100 | 138,400 | 144,600 | 129,100
Uncollectible Expense | 0 | 0 | 0 | 0
Uncollectible Costs Deferred | 15,000 | 9,300 | 11,000 | 21,200
Write-Offs | (3,300) | (2,300) | (4,400) | (5,200)
Recoveries Collected | 300 | 200 | 900 | 500
Ending Balance | 152,100 | 145,600 | 152,100 | 145,600
Hardship Accounts | NSTAR Electric |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Balance | 39,700 | 31,100 | 43,300 | 39,700
Uncollectible Expense | 0 | 0 | 0 | 0
Uncollectible Costs Deferred | 5,400 | 4,900 | 2,100 | (3,500)
Write-Offs | (100) | (100) | (400) | (300)
Recoveries Collected | 0 | 0 | 0 | 0
Ending Balance | 45,000 | 35,900 | 45,000 | 35,900
Retail (Non-Hardship), Wholesale, and Other |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Balance | 206,700 | 194,400 | 191,300 | 164,100
Uncollectible Expense | 12,900 | 11,400 | 30,000 | 27,700
Uncollectible Costs Deferred | 12,600 | 24,500 | 27,300 | 51,600
Write-Offs | (21,100) | (18,100) | (43,100) | (34,800)
Recoveries Collected | 4,000 | 2,900 | 9,600 | 6,500
Ending Balance | 215,100 | 215,100 | 215,100 | 215,100
Retail (Non-Hardship), Wholesale, and Other | CL&P |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Balance | 40,400 | 36,700 | 36,700 | 28,300
Uncollectible Expense | 2,900 | 2,800 | 6,700 | 6,600
Uncollectible Costs Deferred | 2,200 | 8,300 | 0 | 15,700
Write-Offs | (6,200) | (5,400) | (6,700) | (9,300)
Recoveries Collected | 1,300 | 800 | 3,900 | 1,900
Ending Balance | 40,600 | 43,200 | 40,600 | 43,200
Retail (Non-Hardship), Wholesale, and Other | NSTAR Electric |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Balance | 55,100 | 58,200 | 53,700 | 51,900
Uncollectible Expense | 4,000 | 3,500 | 8,700 | 7,400
Uncollectible Costs Deferred | 2,400 | 6,900 | 7,800 | 15,200
Write-Offs | (7,700) | (7,700) | (18,300) | (15,200)
Recoveries Collected | 1,700 | 1,200 | 3,600 | 2,800
Ending Balance | $ 55,500 | $ 62,100 | $ 55,500 | $ 62,100

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