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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Allowance for Uncollectible Accounts (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning Balance | $ 417,406 | $ 358,900 | $ 224,800
Increase due to CMA acquisition |  |  | 24,200
Uncollectible Expense | 61,876 | 60,886 | 53,461
Uncollectible Costs Deferred | 112,500 | 110,600 | 97,000
Write-Offs | (124,000) | (129,700) | (78,000)
Recoveries Collected | 18,500 | 16,700 | 13,600
Ending Balance | 486,297 | 417,406 | 358,900
Restatement Adjustment |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning Balance |  | 23,800 | 23,800
Ending Balance |  |  | 23,800
Hardship Accounts |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning Balance | 226,100 | 194,800 | 143,300
Increase due to CMA acquisition |  |  | 0
Uncollectible Expense | 0 | 0 | 0
Uncollectible Costs Deferred | 77,800 | 51,900 | 43,100
Write-Offs | (21,300) | (22,000) | (14,700)
Recoveries Collected | 1,800 | 1,400 | 1,500
Ending Balance | 284,400 | 226,100 | 194,800
Hardship Accounts | Restatement Adjustment |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning Balance |  |  | 21,600
Retail (Non-Hardship), Wholesale, and Other |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning Balance | 191,300 | 164,100 | 81,500
Increase due to CMA acquisition |  |  | 24,200
Uncollectible Expense | 61,900 | 60,900 | 53,500
Uncollectible Costs Deferred | 34,700 | 58,700 | 53,900
Write-Offs | (102,700) | (107,700) | (63,300)
Recoveries Collected | 16,700 | 15,300 | 12,100
Ending Balance | 201,900 | 191,300 | 164,100
Retail (Non-Hardship), Wholesale, and Other | Restatement Adjustment |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning Balance |  |  | 2,200
CL&P |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning Balance | 181,319 | 157,400 | 97,300
Increase due to CMA acquisition |  |  | 0
Uncollectible Expense | 15,578 | 13,495 | 12,882
Uncollectible Costs Deferred | 59,500 | 57,800 | 49,000
Write-Offs | (38,300) | (54,200) | (29,700)
Recoveries Collected | 7,200 | 6,800 | 5,700
Ending Balance | 225,320 | 181,319 | 157,400
CL&P | Restatement Adjustment |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning Balance |  | 22,200 | 22,200
Ending Balance |  |  | 22,200
CL&P | Hardship Accounts |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning Balance | 144,600 | 129,100 | 80,100
Increase due to CMA acquisition |  |  | 0
Uncollectible Expense | 0 | 0 | 0
Uncollectible Costs Deferred | 58,300 | 32,300 | 38,200
Write-Offs | (15,300) | (18,000) | (11,900)
Recoveries Collected | 1,300 | 1,200 | 1,400
Ending Balance | 188,900 | 144,600 | 129,100
CL&P | Hardship Accounts | Restatement Adjustment |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning Balance |  |  | 21,300
CL&P | Retail (Non-Hardship), Wholesale, and Other |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning Balance | 36,700 | 28,300 | 17,200
Increase due to CMA acquisition |  |  | 0
Uncollectible Expense | 15,600 | 13,500 | 12,900
Uncollectible Costs Deferred | 1,200 | 25,500 | 10,800
Write-Offs | (23,000) | (36,200) | (17,800)
Recoveries Collected | 5,900 | 5,600 | 4,300
Ending Balance | 36,400 | 36,700 | 28,300
CL&P | Retail (Non-Hardship), Wholesale, and Other | Restatement Adjustment |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning Balance |  |  | 900
NSTAR Electric |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning Balance | 97,005 | 91,600 | 75,400
Increase due to CMA acquisition |  |  | 0
Uncollectible Expense | 21,550 | 16,649 | 15,293
Uncollectible Costs Deferred | 12,400 | 20,100 | 24,700
Write-Offs | (42,300) | (37,000) | (27,200)
Recoveries Collected | 6,300 | 5,700 | 4,700
Ending Balance | 94,958 | 97,005 | 91,600
NSTAR Electric | Restatement Adjustment |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning Balance |  | (1,300) | (1,300)
Ending Balance |  |  | (1,300)
NSTAR Electric | Hardship Accounts |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning Balance | 43,300 | 39,700 | 43,900
Increase due to CMA acquisition |  |  | 0
Uncollectible Expense | 0 | 0 | 0
Uncollectible Costs Deferred | 1,500 | 4,300 | (1,700)
Write-Offs | (1,100) | (700) | (900)
Recoveries Collected | 0 | 0 | 0
Ending Balance | 43,700 | 43,300 | 39,700
NSTAR Electric | Hardship Accounts | Restatement Adjustment |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning Balance |  |  | (1,600)
NSTAR Electric | Retail (Non-Hardship), Wholesale, and Other |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning Balance | 53,700 | 51,900 | 31,500
Increase due to CMA acquisition |  |  | 0
Uncollectible Expense | 21,600 | 16,600 | 15,300
Uncollectible Costs Deferred | 10,900 | 15,800 | 26,400
Write-Offs | (41,200) | (36,300) | (26,300)
Recoveries Collected | 6,300 | 5,700 | 4,700
Ending Balance | 51,300 | 53,700 | 51,900
NSTAR Electric | Retail (Non-Hardship), Wholesale, and Other | Restatement Adjustment |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning Balance |  |  | 300
PSNH |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning Balance | 24,331 | 17,200 | 10,500
Increase due to CMA acquisition |  |  | 0
Uncollectible Expense | 9,211 | 13,113 | 5,164
Uncollectible Costs Deferred | 2,500 | 3,100 | 7,400
Write-Offs | (7,700) | (10,000) | (6,900)
Recoveries Collected | 900 | 900 | 700
Ending Balance | $ 29,236 | 24,331 | 17,200
PSNH | Restatement Adjustment |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning Balance |  | $ 300 | 300
Ending Balance |  |  | $ 300

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