PUBLIC SERVICE COMPANY OF NEW HAMPSHIRE AND SUBSIDIARIES CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Operating Revenues	$ 9,863,085	$ 8,904,430	$ 8,526,470
Operating Expenses:
Purchased Power and Transmission	3,372,344	2,987,840	3,040,160
Operations and Maintenance	1,739,685	1,480,252	1,363,113
Depreciation	1,103,008	981,380	885,278
Amortization of Regulatory Assets, Net	231,965	177,679	195,380
Energy Efficiency Programs	592,775	535,760	501,369
Taxes Other Than Income Taxes	829,987	752,785	711,035
Total Operating Expenses	7,869,764	6,915,696	6,935,979
Operating Income	1,993,321	1,988,734	1,590,491
Interest Expense	582,334	538,452	533,197
Other Income, Net	161,282	108,590	132,777
Income Before Income Tax Expense	1,572,269	1,558,872	1,190,071
Income Tax Expense	344,223	346,186	273,499
Net Income	1,228,046	1,212,686	916,572
Public Service Company of New Hampshire
Operating Revenues	1,177,248	1,079,095	1,065,936
Operating Expenses:
Purchased Power and Transmission	370,271	364,067	398,449
Operations and Maintenance	237,659	219,325	210,995
Depreciation	120,065	100,372	93,737
Amortization of Regulatory Assets, Net	86,832	52,804	57,732
Energy Efficiency Programs	38,752	37,583	25,982
Taxes Other Than Income Taxes	91,465	81,611	62,574
Total Operating Expenses	945,044	855,762	849,469
Operating Income	232,204	223,333	216,467
Interest Expense	56,998	58,127	60,666
Other Income, Net	14,565	13,786	19,222
Income Before Income Tax Expense	189,771	178,992	175,023
Income Tax Expense	39,433	31,680	40,975
Net Income	$ 150,338	$ 147,312	$ 134,048