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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, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Balance | $ 570,100 | $ 535,100 | $ 554,500 | $ 486,300
Uncollectible Expense | 9,900 | 1,400 | 26,279 | 24,171
Uncollectible Costs Deferred | 36,000 | 21,500 | 74,900 | 79,500
Write-Offs | (39,800) | (29,900) | (83,500) | (65,800)
Recoveries Collected | 3,400 | 4,300 | 7,400 | 8,200
Ending Balance | 579,600 | 532,400 | 579,600 | 532,400
CL&P |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Balance | 307,800 | 253,400 | 296,000 | 225,300
Uncollectible Expense | 2,800 | 900 | 6,326 | 4,750
Uncollectible Costs Deferred | 17,900 | 20,000 | 43,400 | 57,000
Write-Offs | (21,200) | (13,500) | (39,800) | (27,800)
Recoveries Collected | 1,300 | 2,000 | 2,700 | 3,500
Ending Balance | 308,600 | 262,800 | 308,600 | 262,800
NSTAR Electric |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Balance | 97,700 | 94,600 | 97,000 | 95,000
Uncollectible Expense | 5,900 | 3,100 | 12,007 | 7,759
Uncollectible Costs Deferred | 9,000 | 7,600 | 12,600 | 11,700
Write-Offs | (7,300) | (8,700) | (17,500) | (19,400)
Recoveries Collected | 900 | 1,200 | 2,100 | 2,700
Ending Balance | 106,200 | 97,800 | 106,200 | 97,800
PSNH |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Balance | 13,800 | 33,500 | 14,300 | 29,200
Uncollectible Expense | 1,000 | (5,500) | 2,178 | (451)
Uncollectible Costs Deferred | 1,100 | (13,500) | 2,400 | (12,200)
Write-Offs | (2,000) | (2,000) | (5,200) | (4,200)
Recoveries Collected | 200 | 200 | 400 | 400
Ending Balance | 14,100 | 12,700 | 14,100 | 12,700
Hardship Accounts |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Balance | 379,400 | 318,700 | 366,800 | 284,400
Uncollectible Expense | 0 | 0 | 0 | 0
Uncollectible Costs Deferred | 26,000 | 27,000 | 53,500 | 70,800
Write-Offs | (16,500) | (8,100) | (31,700) | (17,800)
Recoveries Collected | 200 | 600 | 500 | 800
Ending Balance | 389,100 | 338,200 | 389,100 | 338,200
Hardship Accounts | CL&P |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Balance | 271,800 | 216,200 | 259,700 | 188,900
Uncollectible Expense | 0 | 0 | 0 | 0
Uncollectible Costs Deferred | 15,300 | 16,600 | 38,100 | 50,900
Write-Offs | (12,900) | (6,800) | (23,800) | (14,100)
Recoveries Collected | 200 | 500 | 400 | 800
Ending Balance | 274,400 | 226,500 | 274,400 | 226,500
Hardship Accounts | NSTAR Electric |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Balance | 41,800 | 42,000 | 43,600 | 43,700
Uncollectible Expense | 0 | 0 | 0 | 0
Uncollectible Costs Deferred | 4,300 | 3,700 | 3,500 | 2,400
Write-Offs | (200) | (100) | (1,200) | (500)
Recoveries Collected | 0 | 0 | 0 | 0
Ending Balance | 45,900 | 45,600 | 45,900 | 45,600
Retail (Non-Hardship), Wholesale, and Other |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Balance | 190,700 | 216,400 | 187,700 | 201,900
Uncollectible Expense | 9,900 | 1,400 | 26,300 | 24,200
Uncollectible Costs Deferred | 10,000 | (5,500) | 21,400 | 8,700
Write-Offs | (23,300) | (21,800) | (51,800) | (48,000)
Recoveries Collected | 3,200 | 3,700 | 6,900 | 7,400
Ending Balance | 190,500 | 194,200 | 190,500 | 194,200
Retail (Non-Hardship), Wholesale, and Other | CL&P |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Balance | 36,000 | 37,200 | 36,300 | 36,400
Uncollectible Expense | 2,800 | 900 | 6,300 | 4,800
Uncollectible Costs Deferred | 2,600 | 3,400 | 5,300 | 6,100
Write-Offs | (8,300) | (6,700) | (16,000) | (13,700)
Recoveries Collected | 1,100 | 1,500 | 2,300 | 2,700
Ending Balance | 34,200 | 36,300 | 34,200 | 36,300
Retail (Non-Hardship), Wholesale, and Other | NSTAR Electric |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Balance | 55,900 | 52,600 | 53,400 | 51,300
Uncollectible Expense | 5,900 | 3,100 | 12,000 | 7,800
Uncollectible Costs Deferred | 4,700 | 3,900 | 9,100 | 9,300
Write-Offs | (7,100) | (8,600) | (16,300) | (18,900)
Recoveries Collected | 900 | 1,200 | 2,100 | 2,700
Ending Balance | $ 60,300 | $ 52,200 | $ 60,300 | $ 52,200

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