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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Provision for Uncollectible Accounts (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2023 | Mar. 31, 2022
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning Balance | $ 486,300 | $ 417,400
Uncollectible Expense | 22,821 | 17,135
Uncollectible Costs Deferred | 58,000 | 15,700
Write-Offs | (36,000) | (24,300)
Recoveries Collected | 4,000 | 6,300
Ending Balance | 535,100 | 432,200
CL&P |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning Balance | 225,300 | 181,300
Uncollectible Expense | 3,876 | 3,776
Uncollectible Costs Deferred | 37,000 | (6,100)
Write-Offs | (14,300) | (1,600)
Recoveries Collected | 1,500 | 3,100
Ending Balance | 253,400 | 180,500
NSTAR Electric |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning Balance | 95,000 | 97,000
Uncollectible Expense | 4,697 | 4,662
Uncollectible Costs Deferred | 4,100 | 2,100
Write-Offs | (10,700) | (10,900)
Recoveries Collected | 1,500 | 1,900
Ending Balance | 94,600 | 94,800
PSNH |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning Balance | 29,200 | 24,300
Uncollectible Expense | 5,060 | 2,496
Uncollectible Costs Deferred | 1,200 | 1,000
Write-Offs | (2,200) | (1,800)
Recoveries Collected | 200 | 200
Ending Balance | 33,500 | 26,200
Hardship Accounts |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning Balance | 284,400 | 226,100
Uncollectible Expense | 0 | 0
Uncollectible Costs Deferred | 43,700 | 900
Write-Offs | (9,700) | (2,300)
Recoveries Collected | 300 | 800
Ending Balance | 318,700 | 225,500
Hardship Accounts | CL&P |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning Balance | 188,900 | 144,600
Uncollectible Expense | 0 | 0
Uncollectible Costs Deferred | 34,300 | (4,000)
Write-Offs | (7,300) | (1,100)
Recoveries Collected | 300 | 600
Ending Balance | 216,200 | 140,100
Hardship Accounts | NSTAR Electric |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning Balance | 43,700 | 43,300
Uncollectible Expense | 0 | 0
Uncollectible Costs Deferred | (1,300) | (3,300)
Write-Offs | (400) | (300)
Recoveries Collected | 0 | 0
Ending Balance | 42,000 | 39,700
Retail (Non-Hardship), Wholesale, and Other |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning Balance | 201,900 | 191,300
Uncollectible Expense | 22,800 | 17,100
Uncollectible Costs Deferred | 14,300 | 14,800
Write-Offs | (26,300) | (22,000)
Recoveries Collected | 3,700 | 5,500
Ending Balance | 216,400 | 206,700
Retail (Non-Hardship), Wholesale, and Other | CL&P |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning Balance | 36,400 | 36,700
Uncollectible Expense | 3,900 | 3,800
Uncollectible Costs Deferred | 2,700 | (2,100)
Write-Offs | (7,000) | (500)
Recoveries Collected | 1,200 | 2,500
Ending Balance | 37,200 | 40,400
Retail (Non-Hardship), Wholesale, and Other | NSTAR Electric |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning Balance | 51,300 | 53,700
Uncollectible Expense | 4,700 | 4,700
Uncollectible Costs Deferred | 5,400 | 5,400
Write-Offs | (10,300) | (10,600)
Recoveries Collected | 1,500 | 1,900
Ending Balance | $ 52,600 | $ 55,100

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