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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, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Balance | $ 565,600 | $ 570,100 | $ 556,200 | $ 554,500
Uncollectible Expense | 18,600 | 9,900 | 41,519 | 26,279
Uncollectible Costs Deferred | 26,700 | 36,000 | 59,900 | 74,900
Write-Offs | (39,200) | (39,800) | (89,600) | (83,500)
Recoveries Collected | 3,900 | 3,400 | 7,600 | 7,400
Ending Balance | 575,600 | 579,600 | 575,600 | 579,600
CL&P |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Balance | 276,200 | 307,800 | 279,100 | 296,000
Uncollectible Expense | 5,400 | 2,800 | 10,118 | 6,326
Uncollectible Costs Deferred | 6,100 | 17,900 | 16,800 | 43,400
Write-Offs | (15,400) | (21,200) | (34,800) | (39,800)
Recoveries Collected | 1,300 | 1,300 | 2,400 | 2,700
Ending Balance | 273,600 | 308,600 | 273,600 | 308,600
NSTAR Electric |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Balance | 116,000 | 97,700 | 114,900 | 97,000
Uncollectible Expense | 6,500 | 5,900 | 14,002 | 12,007
Uncollectible Costs Deferred | 9,000 | 9,000 | 18,000 | 12,600
Write-Offs | (12,800) | (7,300) | (29,600) | (17,500)
Recoveries Collected | 1,500 | 900 | 2,900 | 2,100
Ending Balance | 120,200 | 106,200 | 120,200 | 106,200
PSNH |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Balance | 14,300 | 13,800 | 14,100 | 14,300
Uncollectible Expense | 1,100 | 1,000 | 2,447 | 2,178
Uncollectible Costs Deferred | 1,200 | 1,100 | 2,600 | 2,400
Write-Offs | (1,800) | (2,000) | (4,500) | (5,200)
Recoveries Collected | 200 | 200 | 400 | 400
Ending Balance | 15,000 | 14,100 | 15,000 | 14,100
Hardship Accounts |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Balance | 371,500 | 379,400 | 364,600 | 366,800
Uncollectible Expense | 0 | 0 | 0 | 0
Uncollectible Costs Deferred | 14,900 | 26,000 | 34,300 | 53,500
Write-Offs | (9,600) | (16,500) | (22,200) | (31,700)
Recoveries Collected | 200 | 200 | 300 | 500
Ending Balance | 377,000 | 389,100 | 377,000 | 389,100
Hardship Accounts | CL&P |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Balance | 240,300 | 271,800 | 240,700 | 259,700
Uncollectible Expense | 0 | 0 | 0 | 0
Uncollectible Costs Deferred | 3,200 | 15,300 | 12,000 | 38,100
Write-Offs | (7,300) | (12,900) | (16,600) | (23,800)
Recoveries Collected | 100 | 200 | 200 | 400
Ending Balance | 236,300 | 274,400 | 236,300 | 274,400
Hardship Accounts | NSTAR Electric |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Balance | 57,800 | 41,800 | 55,200 | 43,600
Uncollectible Expense | 0 | 0 | 0 | 0
Uncollectible Costs Deferred | 3,200 | 4,300 | 6,700 | 3,500
Write-Offs | (700) | (200) | (1,600) | (1,200)
Recoveries Collected | 0 | 0 | 0 | 0
Ending Balance | 60,300 | 45,900 | 60,300 | 45,900
Retail (Non-Hardship), Wholesale, and Other |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Balance | 194,100 | 190,700 | 191,600 | 187,700
Uncollectible Expense | 18,600 | 9,900 | 41,500 | 26,300
Uncollectible Costs Deferred | 11,800 | 10,000 | 25,600 | 21,400
Write-Offs | (29,600) | (23,300) | (67,400) | (51,800)
Recoveries Collected | 3,700 | 3,200 | 7,300 | 6,900
Ending Balance | 198,600 | 190,500 | 198,600 | 190,500
Retail (Non-Hardship), Wholesale, and Other | CL&P |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Balance | 35,900 | 36,000 | 38,400 | 36,300
Uncollectible Expense | 5,400 | 2,800 | 10,100 | 6,300
Uncollectible Costs Deferred | 2,900 | 2,600 | 4,800 | 5,300
Write-Offs | (8,100) | (8,300) | (18,200) | (16,000)
Recoveries Collected | 1,200 | 1,100 | 2,200 | 2,300
Ending Balance | 37,300 | 34,200 | 37,300 | 34,200
Retail (Non-Hardship), Wholesale, and Other | NSTAR Electric |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Balance | 58,200 | 55,900 | 59,700 | 53,400
Uncollectible Expense | 6,500 | 5,900 | 14,000 | 12,000
Uncollectible Costs Deferred | 5,800 | 4,700 | 11,300 | 9,100
Write-Offs | (12,100) | (7,100) | (28,000) | (16,300)
Recoveries Collected | 1,500 | 900 | 2,900 | 2,100
Ending Balance | $ 59,900 | $ 60,300 | $ 59,900 | $ 60,300

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