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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Provision for Uncollectible Accounts (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning Balance | $ 417,400 | $ 358,900
Uncollectible Expense | 17,135 | 16,295
Uncollectible Costs Deferred | 15,700 | 32,500
Write-Offs | (24,300) | (20,000)
Recoveries Collected | 6,300 | 4,000
Ending Balance | 432,200 | 391,700
CL&P |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning Balance | 181,300 | 157,400
Uncollectible Expense | 3,776 | 3,797
Uncollectible Costs Deferred | (6,100) | 19,400
Write-Offs | (1,600) | (6,900)
Recoveries Collected | 3,100 | 1,400
Ending Balance | 180,500 | 175,100
NSTAR Electric |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning Balance | 97,000 | 91,600
Uncollectible Expense | 4,662 | 3,868
Uncollectible Costs Deferred | 2,100 | (100)
Write-Offs | (10,900) | (7,600)
Recoveries Collected | 1,900 | 1,500
Ending Balance | 94,800 | 89,300
PSNH |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning Balance | 24,300 | 17,200
Uncollectible Expense | 2,496 | 1,221
Uncollectible Costs Deferred | 1,000 | 1,200
Write-Offs | (1,800) | (2,500)
Recoveries Collected | 200 | 200
Ending Balance | 26,200 | 17,300
Hardship Accounts |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning Balance | 226,100 | 194,800
Uncollectible Expense | 0 | 0
Uncollectible Costs Deferred | 900 | 5,400
Write-Offs | (2,300) | (3,300)
Recoveries Collected | 800 | 400
Ending Balance | 225,500 | 197,300
Hardship Accounts | CL&P |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning Balance | 144,600 | 129,100
Uncollectible Expense | 0 | 0
Uncollectible Costs Deferred | (4,000) | 11,900
Write-Offs | (1,100) | (2,900)
Recoveries Collected | 600 | 300
Ending Balance | 140,100 | 138,400
Hardship Accounts | NSTAR Electric |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning Balance | 43,300 | 39,700
Uncollectible Expense | 0 | 0
Uncollectible Costs Deferred | (3,300) | (8,500)
Write-Offs | (300) | (100)
Recoveries Collected | 0 | 0
Ending Balance | 39,700 | 31,100
Retail (Non-Hardship), Wholesale, and Other |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning Balance | 191,300 | 164,100
Uncollectible Expense | 17,100 | 16,300
Uncollectible Costs Deferred | 14,800 | 27,100
Write-Offs | (22,000) | (16,700)
Recoveries Collected | 5,500 | 3,600
Ending Balance | 206,700 | 194,400
Retail (Non-Hardship), Wholesale, and Other | CL&P |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning Balance | 36,700 | 28,300
Uncollectible Expense | 3,800 | 3,800
Uncollectible Costs Deferred | (2,100) | 7,500
Write-Offs | (500) | (4,000)
Recoveries Collected | 2,500 | 1,100
Ending Balance | 40,400 | 36,700
Retail (Non-Hardship), Wholesale, and Other | NSTAR Electric |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning Balance | 53,700 | 51,900
Uncollectible Expense | 4,700 | 3,900
Uncollectible Costs Deferred | 5,400 | 8,400
Write-Offs | (10,600) | (7,500)
Recoveries Collected | 1,900 | 1,500
Ending Balance | $ 55,100 | $ 58,200

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