CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Provision for uncollectible accounts	$ 262,078	$ 224,821
The Connecticut Light and Power Company
Provision for uncollectible accounts	130,876	97,348
NSTAR Electric Company
Provision for uncollectible accounts	71,111	75,406
Public Service Company of New Hampshire
Provision for uncollectible accounts	$ 11,154	$ 10,497