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SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS AND RESERVES (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |  |
Increase due to CMA acquisition |  |  | $ 24,200 |
Allowance for uncollectible accounts for late fees and other receivable amounts | $ 486,297 | $ 417,406 | 358,900 | $ 224,800
Restatement Adjustment |  |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |  |
Allowance for uncollectible accounts for late fees and other receivable amounts |  |  | 23,800 | 23,800
CL&P |  |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |  |
Increase due to CMA acquisition |  |  | 0 |
Allowance for uncollectible accounts for late fees and other receivable amounts | 225,320 | 181,319 | 157,400 | 97,300
CL&P | Restatement Adjustment |  |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |  |
Allowance for uncollectible accounts for late fees and other receivable amounts |  |  | 22,200 | 22,200
NSTAR Electric |  |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |  |
Increase due to CMA acquisition |  |  | 0 |
Allowance for uncollectible accounts for late fees and other receivable amounts | 94,958 | 97,005 | 91,600 | 75,400
NSTAR Electric | Restatement Adjustment |  |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |  |
Allowance for uncollectible accounts for late fees and other receivable amounts |  |  | (1,300) | (1,300)
PSNH |  |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |  |
Increase due to CMA acquisition |  |  | 0 |
Allowance for uncollectible accounts for late fees and other receivable amounts | 29,236 | 24,331 | 17,200 | 10,500
PSNH | Restatement Adjustment |  |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |  |
Allowance for uncollectible accounts for late fees and other receivable amounts |  |  | 300 | $ 300
Allowance for Doubtful Accounts |  |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |  |
Balance at beginning of period | 417,406 | 358,851 | 224,821 |
Additions, Charged to Costs and Expense | 61,876 | 60,886 | 53,461 |
Additions, Charged to Other Accounts | 112,533 | 110,572 | 145,005 |
Deductions | 105,518 | 112,903 | 64,436 |
Balance at end of period | 486,297 | 417,406 | 358,851 |
Allowance for Doubtful Accounts | CL&P |  |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |  |
Balance at beginning of period | 181,319 | 157,447 | 97,348 |
Additions, Charged to Costs and Expense | 15,578 | 13,495 | 12,882 |
Additions, Charged to Other Accounts | 59,485 | 57,779 | 71,223 |
Deductions | 31,062 | 47,402 | 24,006 |
Balance at end of period | 225,320 | 181,319 | 157,447 |
Allowance for Doubtful Accounts | NSTAR Electric |  |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |  |
Balance at beginning of period | 97,005 | 91,583 | 75,406 |
Additions, Charged to Costs and Expense | 21,550 | 16,649 | 15,293 |
Additions, Charged to Other Accounts | 12,412 | 20,064 | 23,424 |
Deductions | 36,009 | 31,291 | 22,540 |
Balance at end of period | 94,958 | 97,005 | 91,583 |
Allowance for Doubtful Accounts | PSNH |  |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |  |
Balance at beginning of period | 24,331 | 17,157 | 10,497 |
Additions, Charged to Costs and Expense | 9,211 | 13,113 | 5,164 |
Additions, Charged to Other Accounts | 2,539 | 3,135 | 7,692 |
Deductions | 6,845 | 9,074 | 6,196 |
Balance at end of period | $ 29,236 | $ 24,331 | $ 17,157 |

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