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
Beginning balance (in shares) at Dec. 31, 2022		348,443,855					301
Balance as of Beginning of Period 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 (Loss)/Income						40,296			40,296
Dividends on Common Stock	(235,354)			(235,354)		(28,000)			(28,000)
Other Comprehensive Income (Loss)						73				73
Ending balance (in shares) at Mar. 31, 2023		348,808,082					301
Balance as of End of Period 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
Beginning balance (in shares) at Dec. 31, 2022		348,443,855					301
Balance as of Beginning of Period 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 (Loss)/Income						151,996
Other Comprehensive Income (Loss)	15,400					73
Ending balance (in shares) at Sep. 30, 2023		349,275,775					301
Balance as of End of Period 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
Beginning balance (in shares) at Mar. 31, 2023		348,808,082					301
Balance as of Beginning of Period 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 (Loss)/Income						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
Ending balance (in shares) at Jun. 30, 2023		349,021,936					301
Balance as of End of Period 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 (Loss)/Income						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
Ending balance (in shares) at Sep. 30, 2023		349,275,775					301
Balance as of End of Period 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
Beginning balance (in shares) at Dec. 31, 2023	349,540,266	349,540,266					301
Balance as of Beginning of Period at Dec. 31, 2023	$ 14,173,892	$ 1,799,920	8,460,876	4,142,515	(33,737)	2,353,919	$ 0	1,698,134	655,785	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (Loss)/Income						48,356			48,356
Dividends on Common Stock	(250,770)			(250,770)
Capital Contributions from Eversource Parent						100,000		100,000
Ending balance (in shares) at Mar. 31, 2024		351,379,414					301
Balance as of End of Period at Mar. 31, 2024	$ 14,543,588	$ 1,806,385	8,537,591	4,413,593	(28,534)	2,502,275	$ 0	1,798,134	704,141	0
Beginning balance (in shares) at Dec. 31, 2023	349,540,266	349,540,266					301
Balance as of Beginning of Period at Dec. 31, 2023	$ 14,173,892	$ 1,799,920	8,460,876	4,142,515	(33,737)	2,353,919	$ 0	1,698,134	655,785	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (Loss)/Income						163,597
Other Comprehensive Income (Loss)	$ 5,500					0
Ending balance (in shares) at Sep. 30, 2024	363,891,973	363,891,973					301
Balance as of End of Period at Sep. 30, 2024	$ 15,044,424	$ 1,866,385	9,263,434	4,118,654	(28,205)	2,655,516	$ 0	1,898,134	757,382	0
Beginning balance (in shares) at Mar. 31, 2024		351,379,414					301
Balance as of Beginning of Period at Mar. 31, 2024	14,543,588	$ 1,806,385	8,537,591	4,413,593	(28,534)	2,502,275	$ 0	1,798,134	704,141	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (Loss)/Income						51,444			51,444
Dividends on Common Stock	(252,104)			(252,104)		(62,000)			(62,000)
Ending balance (in shares) at Jun. 30, 2024		354,566,071					301
Balance as of End of Period at Jun. 30, 2024	14,818,713	$ 1,820,954	8,710,844	4,496,830	(29,581)	2,491,719	$ 0	1,798,134	693,585	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (Loss)/Income						63,797			63,797
Dividends on Common Stock	$ (260,119)			(260,119)
Capital Contributions from Eversource Parent						100,000		100,000
Other Comprehensive Income (Loss)						0
Ending balance (in shares) at Sep. 30, 2024	363,891,973	363,891,973					301
Balance as of End of Period at Sep. 30, 2024	$ 15,044,424	$ 1,866,385	$ 9,263,434	$ 4,118,654	$ (28,205)	$ 2,655,516	$ 0	$ 1,898,134	$ 757,382	$ 0