PUBLIC SERVICE COMPANY OF NEW HAMPSHIRE AND SUBSIDIARIES CONDENSED CONSOLIDATED STATEMENTS OF COMMON STOCKHOLDER'S EQUITY - USD ($) $ in Thousands	Total	Common Stock	Capital Surplus, Paid In	Retained Earnings	Accumulated Other Comprehensive Income/(Loss)	PSNH	PSNH Common Stock	PSNH Capital Surplus, Paid In	PSNH Retained Earnings	PSNH Accumulated Other Comprehensive Income/(Loss)
Balance (in shares) at Dec. 31, 2020		342,954,023					301
Balance at Dec. 31, 2020	$ 14,063,566	$ 1,789,092	$ 8,015,663	$ 4,613,201	$ (76,411)	$ 1,542,539	$ 0	$ 928,134	$ 615,018	$ (613)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	368,023			368,023		44,676			44,676
Dividends on Common Stock	(206,913)			(206,913)		(25,200)			(25,200)
Other Comprehensive Income, Net of Tax	1,188				1,188	255				255
Balance (in shares) at Mar. 31, 2021		343,434,298					301
Balance at Mar. 31, 2021	14,233,420	$ 1,789,092	8,016,118	4,772,431	(75,223)	1,562,270	$ 0	928,134	634,494	(358)
Balance (in shares) at Dec. 31, 2020		342,954,023					301
Balance at Dec. 31, 2020	14,063,566	$ 1,789,092	8,015,663	4,613,201	(76,411)	1,542,539	$ 0	928,134	615,018	(613)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	919,468					123,452
Other Comprehensive Income, Net of Tax	4,546					640
Balance (in shares) at Sep. 30, 2021		343,774,324					301
Balance at Sep. 30, 2021	14,411,611	$ 1,789,092	8,050,872	4,906,151	(71,865)	1,591,031	$ 0	1,088,134	502,870	27
Balance (in shares) at Mar. 31, 2021		343,434,298					301
Balance at Mar. 31, 2021	14,233,420	$ 1,789,092	8,016,118	4,772,431	(75,223)	1,562,270	$ 0	928,134	634,494	(358)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	266,400			266,400		34,633			34,633
Dividends on Common Stock	(206,893)			(206,893)		(185,200)			(185,200)
Capital Contributions from Eversource Parent						160,000		160,000
Other Comprehensive Income, Net of Tax	881				881	282				282
Balance (in shares) at Jun. 30, 2021		343,601,103					301
Balance at Jun. 30, 2021	14,311,889	$ 1,789,092	8,032,959	4,830,058	(74,342)	1,571,985	$ 0	1,088,134	483,927	(76)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	285,046			285,046		44,143			44,143
Dividends on Common Stock	(207,073)			(207,073)		(25,200)			(25,200)
Other Comprehensive Income, Net of Tax	2,477				2,477	103				103
Balance (in shares) at Sep. 30, 2021		343,774,324					301
Balance at Sep. 30, 2021	$ 14,411,611	$ 1,789,092	8,050,872	4,906,151	(71,865)	1,591,031	$ 0	1,088,134	502,870	27
Balance (in shares) at Dec. 31, 2021	344,403,196	344,403,196					301
Balance at Dec. 31, 2021	$ 14,599,844	$ 1,789,092	8,098,514	5,005,391	(42,275)	1,592,713	$ 0	1,088,134	504,556	23
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	445,326			445,326		45,586			45,586
Dividends on Common Stock	(219,768)			(219,768)		(26,000)			(26,000)
Other Comprehensive Income, Net of Tax	704				704	(48)				(48)
Balance (in shares) at Mar. 31, 2022		344,850,272					301
Balance at Mar. 31, 2022	$ 14,836,690	$ 1,789,092	8,102,618	5,229,069	(41,571)	1,612,251	$ 0	1,088,134	524,142	(25)
Balance (in shares) at Dec. 31, 2021	344,403,196	344,403,196					301
Balance at Dec. 31, 2021	$ 14,599,844	$ 1,789,092	8,098,514	5,005,391	(42,275)	1,592,713	$ 0	1,088,134	504,556	23
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	1,090,356					134,071
Other Comprehensive Income, Net of Tax	$ 1,269					(117)
Balance (in shares) at Sep. 30, 2022	347,348,749	347,348,749					301
Balance at Sep. 30, 2022	$ 15,279,173	$ 1,799,920	8,327,477	5,429,076	(41,006)	1,828,667	$ 0	1,268,134	560,627	(94)
Balance (in shares) at Mar. 31, 2022		344,850,272					301
Balance at Mar. 31, 2022	14,836,690	$ 1,789,092	8,102,618	5,229,069	(41,571)	1,612,251	$ 0	1,088,134	524,142	(25)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	293,742			293,742		37,038			37,038
Dividends on Common Stock	(219,877)			(219,877)		(26,000)			(26,000)
Capital Contributions from Eversource Parent						180,000		180,000
Other Comprehensive Income, Net of Tax	(1,293)				(1,293)	(30)				(30)
Balance (in shares) at Jun. 30, 2022		346,411,029					301
Balance at Jun. 30, 2022	15,057,215	$ 1,796,056	8,242,346	5,301,054	(42,864)	1,803,259	$ 0	1,268,134	535,180	(55)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	351,289			351,289		51,447			51,447
Dividends on Common Stock	(221,387)			(221,387)		(26,000)			(26,000)
Other Comprehensive Income, Net of Tax	$ 1,858				1,858	(39)				(39)
Balance (in shares) at Sep. 30, 2022	347,348,749	347,348,749					301
Balance at Sep. 30, 2022	$ 15,279,173	$ 1,799,920	$ 8,327,477	$ 5,429,076	$ (41,006)	$ 1,828,667	$ 0	$ 1,268,134	$ 560,627	$ (94)