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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, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Balance | $ 425,800 | $ 270,000 | $ 358,900 | $ 224,800
Uncollectible Expense | 12,000 | 10,500 | 39,690 | 31,101
Uncollectible Costs Deferred | 24,500 | 30,500 | 98,100 | 66,400
Write-Offs | (24,400) | (19,100) | (65,800) | (61,600)
Recoveries Collected | 3,800 | 3,100 | 10,800 | 10,500
Ending Balance | 441,700 | 295,000 | 441,700 | 295,000
Restatement Adjustment |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Balance |  |  |  | 23,800
CL&P |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Balance | 188,800 | 136,700 | 157,400 | 97,300
Uncollectible Expense | 3,600 | 3,800 | 10,183 | 10,013
Uncollectible Costs Deferred | 10,200 | 16,100 | 47,100 | 41,000
Write-Offs | (8,900) | (7,200) | (23,500) | (24,000)
Recoveries Collected | 1,800 | 1,400 | 4,300 | 4,300
Ending Balance | 195,500 | 150,800 | 195,500 | 150,800
CL&P | Restatement Adjustment |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Balance |  |  |  | 22,200
NSTAR Electric |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Balance | 98,000 | 68,700 | 91,600 | 75,400
Uncollectible Expense | 5,100 | 4,500 | 12,477 | 11,321
Uncollectible Costs Deferred | 8,300 | 9,100 | 20,100 | 8,900
Write-Offs | (7,500) | (6,500) | (23,000) | (21,300)
Recoveries Collected | 1,100 | 1,000 | 3,800 | 3,800
Ending Balance | 105,000 | 76,800 | 105,000 | 76,800
NSTAR Electric | Restatement Adjustment |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Balance |  |  |  | (1,300)
PSNH |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Balance | 17,200 | 11,800 | 17,200 | 10,500
Uncollectible Expense | 1,200 | 800 | 4,381 | 2,058
Uncollectible Costs Deferred | 1,200 | 3,200 | 2,000 | 5,600
Write-Offs | (2,800) | (2,000) | (7,300) | (5,000)
Recoveries Collected | 200 | 200 | 700 | 500
Ending Balance | 17,000 | 14,000 | 17,000 | 14,000
PSNH | Restatement Adjustment |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Balance |  |  |  | 300
Hardship Accounts |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Balance | 210,700 | 175,500 | 194,800 | 143,300
Uncollectible Expense | 0 | 0 | 0 | 0
Uncollectible Costs Deferred | 22,800 | 10,100 | 44,800 | 24,900
Write-Offs | (3,900) | (7,300) | (10,600) | (12,300)
Recoveries Collected | 300 | 400 | 900 | 1,200
Ending Balance | 229,900 | 178,700 | 229,900 | 178,700
Hardship Accounts | Restatement Adjustment |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Balance |  |  |  | 21,600
Hardship Accounts | CL&P |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Balance | 145,600 | 116,300 | 129,100 | 80,100
Uncollectible Expense | 0 | 0 | 0 | 0
Uncollectible Costs Deferred | 4,500 | 11,200 | 25,700 | 32,700
Write-Offs | (3,500) | (2,600) | (8,700) | (10,000)
Recoveries Collected | 200 | 300 | 700 | 1,100
Ending Balance | 146,800 | 125,200 | 146,800 | 125,200
Hardship Accounts | CL&P | Restatement Adjustment |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Balance |  |  |  | 21,300
Hardship Accounts | NSTAR Electric |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Balance | 35,900 | 34,600 | 39,700 | 43,900
Uncollectible Expense | 0 | 0 | 0 | 0
Uncollectible Costs Deferred | 11,800 | (1,300) | 8,300 | (8,400)
Write-Offs | (100) | (200) | (400) | (800)
Recoveries Collected | 0 | 0 | 0 | 0
Ending Balance | 47,600 | 33,100 | 47,600 | 33,100
Hardship Accounts | NSTAR Electric | Restatement Adjustment |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Balance |  |  |  | (1,600)
Retail (Non-Hardship), Wholesale, and Other Receivables |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Balance | 215,100 | 94,500 | 164,100 | 81,500
Uncollectible Expense | 12,000 | 10,500 | 39,700 | 31,100
Uncollectible Costs Deferred | 1,700 | 20,400 | 53,300 | 41,500
Write-Offs | (20,500) | (11,800) | (55,200) | (49,300)
Recoveries Collected | 3,500 | 2,700 | 9,900 | 9,300
Ending Balance | 211,800 | 116,300 | 211,800 | 116,300
Retail (Non-Hardship), Wholesale, and Other Receivables | Restatement Adjustment |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Balance |  |  |  | 2,200
Retail (Non-Hardship), Wholesale, and Other Receivables | CL&P |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Balance | 43,200 | 20,400 | 28,300 | 17,200
Uncollectible Expense | 3,600 | 3,800 | 10,200 | 10,000
Uncollectible Costs Deferred | 5,700 | 4,900 | 21,400 | 8,300
Write-Offs | (5,400) | (4,600) | (14,800) | (14,000)
Recoveries Collected | 1,600 | 1,100 | 3,600 | 3,200
Ending Balance | 48,700 | 25,600 | 48,700 | 25,600
Retail (Non-Hardship), Wholesale, and Other Receivables | CL&P | Restatement Adjustment |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Balance |  |  |  | 900
Retail (Non-Hardship), Wholesale, and Other Receivables | NSTAR Electric |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Balance | 62,100 | 34,100 | 51,900 | 31,500
Uncollectible Expense | 5,100 | 4,500 | 12,500 | 11,300
Uncollectible Costs Deferred | (3,500) | 10,400 | 11,800 | 17,300
Write-Offs | (7,400) | (6,300) | (22,600) | (20,500)
Recoveries Collected | 1,100 | 1,000 | 3,800 | 3,800
Ending Balance | $ 57,400 | $ 43,700 | $ 57,400 | 43,700
Retail (Non-Hardship), Wholesale, and Other Receivables | NSTAR Electric | Restatement Adjustment |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Balance |  |  |  | $ 300

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