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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Allowance for Uncollectible Accounts (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Balance as of January 1, 2020 | $ 358,851 | $ 224,800 |
Increase due to CMA acquisition |  | 24,200 |
Uncollectible Expense | 60,886 | 53,461 | $ 63,446
Uncollectible Costs Deferred | 110,600 | 97,000 |
Write-Offs | (129,700) | (78,000) |
Recoveries Collected | 16,700 | 13,600 |
Balance as of December 31, 2020 | 417,406 | 358,851 | 224,800
Restatement Adjustment |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Balance as of January 1, 2020 | 23,800 |  |
Balance as of December 31, 2020 |  | 23,800 |
Hardship Accounts |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Balance as of January 1, 2020 | 194,800 | 143,300 |
Increase due to CMA acquisition |  | 0 |
Uncollectible Expense | 0 | 0 |
Uncollectible Costs Deferred | 51,900 | 43,100 |
Write-Offs | (22,000) | (14,700) |
Recoveries Collected | 1,400 | 1,500 |
Balance as of December 31, 2020 | 226,100 | 194,800 | 143,300
Hardship Accounts | Restatement Adjustment |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Balance as of January 1, 2020 |  | 21,600 |
Balance as of December 31, 2020 |  |  | 21,600
Retail Non Hardship Wholesaleand Other Receivables |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Balance as of January 1, 2020 | 164,100 | 81,500 |
Increase due to CMA acquisition |  | 24,200 |
Uncollectible Expense | 60,900 | 53,500 |
Uncollectible Costs Deferred | 58,700 | 53,900 |
Write-Offs | (107,700) | (63,300) |
Recoveries Collected | 15,300 | 12,100 |
Balance as of December 31, 2020 | 191,300 | 164,100 | 81,500
Retail Non Hardship Wholesaleand Other Receivables | Restatement Adjustment |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Balance as of January 1, 2020 |  | 2,200 |
Balance as of December 31, 2020 |  |  | 2,200
The Connecticut Light and Power Company |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Balance as of January 1, 2020 | 157,447 | 97,300 |
Increase due to CMA acquisition |  | 0 |
Uncollectible Expense | 13,495 | 12,882 | 15,948
Uncollectible Costs Deferred | 57,800 | 49,000 |
Write-Offs | (54,200) | (29,700) |
Recoveries Collected | 6,800 | 5,700 |
Balance as of December 31, 2020 | 181,319 | 157,447 | 97,300
The Connecticut Light and Power Company | Restatement Adjustment |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Balance as of January 1, 2020 | 22,200 |  |
Balance as of December 31, 2020 |  | 22,200 |
The Connecticut Light and Power Company | Hardship Accounts |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Balance as of January 1, 2020 | 129,100 | 80,100 |
Increase due to CMA acquisition |  | 0 |
Uncollectible Expense | 0 | 0 |
Uncollectible Costs Deferred | 32,300 | 38,200 |
Write-Offs | (18,000) | (11,900) |
Recoveries Collected | 1,200 | 1,400 |
Balance as of December 31, 2020 | 144,600 | 129,100 | 80,100
The Connecticut Light and Power Company | Hardship Accounts | Restatement Adjustment |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Balance as of January 1, 2020 |  | 21,300 |
Balance as of December 31, 2020 |  |  | 21,300
The Connecticut Light and Power Company | Retail Non Hardship Wholesaleand Other Receivables |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Balance as of January 1, 2020 | 28,300 | 17,200 |
Increase due to CMA acquisition |  | 0 |
Uncollectible Expense | 13,500 | 12,900 |
Uncollectible Costs Deferred | 25,500 | 10,800 |
Write-Offs | (36,200) | (17,800) |
Recoveries Collected | 5,600 | 4,300 |
Balance as of December 31, 2020 | 36,700 | 28,300 | 17,200
The Connecticut Light and Power Company | Retail Non Hardship Wholesaleand Other Receivables | Restatement Adjustment |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Balance as of January 1, 2020 |  | 900 |
Balance as of December 31, 2020 |  |  | 900
NSTAR Electric Company |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Balance as of January 1, 2020 | 91,583 | 75,400 |
Increase due to CMA acquisition |  | 0 |
Uncollectible Expense | 16,649 | 15,293 | 25,079
Uncollectible Costs Deferred | 20,100 | 24,700 |
Write-Offs | (37,000) | (27,200) |
Recoveries Collected | 5,700 | 4,700 |
Balance as of December 31, 2020 | 97,005 | 91,583 | 75,400
NSTAR Electric Company | Restatement Adjustment |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Balance as of January 1, 2020 | (1,300) |  |
Balance as of December 31, 2020 |  | (1,300) |
NSTAR Electric Company | Hardship Accounts |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Balance as of January 1, 2020 | 39,700 | 43,900 |
Increase due to CMA acquisition |  | 0 |
Uncollectible Expense | 0 | 0 |
Uncollectible Costs Deferred | 4,300 | (1,700) |
Write-Offs | (700) | (900) |
Recoveries Collected | 0 | 0 |
Balance as of December 31, 2020 | 43,300 | 39,700 | 43,900
NSTAR Electric Company | Hardship Accounts | Restatement Adjustment |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Balance as of January 1, 2020 |  | (1,600) |
Balance as of December 31, 2020 |  |  | (1,600)
NSTAR Electric Company | Retail Non Hardship Wholesaleand Other Receivables |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Balance as of January 1, 2020 | 51,900 | 31,500 |
Increase due to CMA acquisition |  | 0 |
Uncollectible Expense | 16,600 | 15,300 |
Uncollectible Costs Deferred | 15,800 | 26,400 |
Write-Offs | (36,300) | (26,300) |
Recoveries Collected | 5,700 | 4,700 |
Balance as of December 31, 2020 | 53,700 | 51,900 | 31,500
NSTAR Electric Company | Retail Non Hardship Wholesaleand Other Receivables | Restatement Adjustment |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Balance as of January 1, 2020 |  | 300 |
Balance as of December 31, 2020 |  |  | 300
Public Service Company of New Hampshire |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Balance as of January 1, 2020 | 17,157 | 10,500 |
Increase due to CMA acquisition |  | 0 |
Uncollectible Expense | 13,113 | 5,164 | 6,726
Uncollectible Costs Deferred | 3,100 | 7,400 |
Write-Offs | (10,000) | (6,900) |
Recoveries Collected | 900 | 700 |
Balance as of December 31, 2020 | 24,331 | 17,157 | $ 10,500
Public Service Company of New Hampshire | Restatement Adjustment |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Balance as of January 1, 2020 | $ 300 |  |
Balance as of December 31, 2020 |  | $ 300 |

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