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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Allowance for uncollectible accounts | $ 441,723 | $ 358,851
The Connecticut Light and Power Company |  |
Allowance for uncollectible accounts | 195,463 | 157,447
NSTAR Electric Company |  |
Allowance for uncollectible accounts | 105,020 | 91,583
Public Service Company of New Hampshire |  |
Allowance for uncollectible accounts | $ 16,996 | $ 17,157

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