Segment Information - Schedule of Gross Margin (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Segment Reporting Information [Line Items]
Gross margin	$ 269,221	$ 237,097	$ 593,647	$ 520,664
Transmission and distribution costs	21,538	19,996	61,160	56,166
Depreciation and amortization	70,321	65,704	210,046	194,807
Utility margin	395,549	355,171	975,387	878,346
Energy Production
Segment Reporting Information [Line Items]
Energy production costs	34,469	32,374	110,534	106,709
Public Service Company of New Mexico
Segment Reporting Information [Line Items]
Gross margin	201,607	176,730	421,327	378,403
Transmission and distribution costs	12,549	12,844	37,678	34,906
Depreciation and amortization	45,361	42,673	137,132	127,111
Utility margin	293,986	264,621	706,671	647,129
Public Service Company of New Mexico | Energy Production
Segment Reporting Information [Line Items]
Energy production costs	34,469	32,374	110,534	106,709
Texas-New Mexico Power Company
Segment Reporting Information [Line Items]
Gross margin	67,614	60,367	172,320	142,261
Transmission and distribution costs	8,989	7,152	23,482	21,260
Depreciation and amortization	24,960	23,031	72,914	67,696
Utility margin	101,563	90,550	268,716	231,217
Texas-New Mexico Power Company | Energy Production
Segment Reporting Information [Line Items]
Energy production costs	0	0	0	0
Corporate and Other
Segment Reporting Information [Line Items]
Gross margin	0	0	0	0
Transmission and distribution costs	0	0	0	0
Depreciation and amortization	0	0	0	0
Utility margin	0	0	0	0
Corporate and Other | Energy Production
Segment Reporting Information [Line Items]
Energy production costs	$ 0	$ 0	$ 0	$ 0