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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Allowance for uncollectible accounts $ 391,663 $ 358,851
The Connecticut Light and Power Company    
Allowance for uncollectible accounts 175,105 157,447
NSTAR Electric Company    
Allowance for uncollectible accounts 89,299 91,583
Public Service Company of New Hampshire    
Allowance for uncollectible accounts $ 17,324 $ 17,157