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 Loss	PSNH	PSNH Common Stock	PSNH Capital Surplus, Paid In	PSNH Retained Earnings	PSNH Accumulated Other Comprehensive Loss
Balance (in shares) at Dec. 31, 2021		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 (loss)						(48)				(48)
Other Comprehensive Income (Loss)	704				704
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					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						134,071
Other comprehensive income (loss)						(117)
Other Comprehensive Income (Loss)	1,269
Balance (in shares) at Sep. 30, 2022		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 (loss)						(30)				(30)
Other Comprehensive Income (Loss)	(1,293)				(1,293)
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 (loss)						(39)				(39)
Other Comprehensive Income (Loss)	1,858				1,858
Balance (in shares) at Sep. 30, 2022		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 Dec. 31, 2022	348,443,855	348,443,855					301
Balance at Dec. 31, 2022	$ 15,473,158	$ 1,799,920	8,401,731	5,527,153	(39,421)	1,870,187	$ 0	1,298,134	572,126	(73)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	493,039			493,039		40,296			40,296
Dividends on Common Stock	(235,354)			(235,354)		(28,000)			(28,000)
Other comprehensive income (loss)						73				73
Other Comprehensive Income (Loss)	3,230				3,230
Balance (in shares) at Mar. 31, 2023		348,808,082					301
Balance at Mar. 31, 2023	$ 15,749,371	$ 1,799,920	8,412,085	5,782,958	(36,191)	1,882,556	$ 0	1,298,134	584,422	0
Balance (in shares) at Dec. 31, 2022	348,443,855	348,443,855					301
Balance at Dec. 31, 2022	$ 15,473,158	$ 1,799,920	8,401,731	5,527,153	(39,421)	1,870,187	$ 0	1,298,134	572,126	(73)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income						151,996
Other comprehensive income (loss)						73
Other Comprehensive Income (Loss)	$ 15,399
Balance (in shares) at Sep. 30, 2023	349,275,775	349,275,775					301
Balance at Sep. 30, 2023	$ 15,685,941	$ 1,799,920	8,443,820	5,666,861	(24,022)	2,110,256	$ 0	1,498,134	612,122	0
Balance (in shares) at Mar. 31, 2023		348,808,082					301
Balance at Mar. 31, 2023	15,749,371	$ 1,799,920	8,412,085	5,782,958	(36,191)	1,882,556	$ 0	1,298,134	584,422	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	17,302			17,302		60,362			60,362
Dividends on Common Stock	(235,491)			(235,491)		(28,000)			(28,000)
Capital Contributions from Eversource Parent						100,000		100,000
Other Comprehensive Income (Loss)	4,088				4,088
Balance (in shares) at Jun. 30, 2023		349,021,936					301
Balance at Jun. 30, 2023	15,554,098	$ 1,799,920	8,428,786	5,562,889	(32,103)	2,014,918	$ 0	1,398,134	616,784	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	341,543			341,543		51,338			51,338
Dividends on Common Stock	(235,691)			(235,691)		(56,000)			(56,000)
Capital Contributions from Eversource Parent						100,000		100,000
Other comprehensive income (loss)						0
Other Comprehensive Income (Loss)	$ 8,081				8,081
Balance (in shares) at Sep. 30, 2023	349,275,775	349,275,775					301
Balance at Sep. 30, 2023	$ 15,685,941	$ 1,799,920	$ 8,443,820	$ 5,666,861	$ (24,022)	$ 2,110,256	$ 0	$ 1,498,134	$ 612,122	$ 0