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Segment Information - Schedule of Gross Margin (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Segment Reporting Information [Line Items]
Gross margin	$ 186,711	$ 154,240
Transmission and distribution costs	22,196	18,466
Depreciation and amortization	71,126	69,432
Utility margin	302,391	275,704
Energy Production
Segment Reporting Information [Line Items]
Energy production costs	22,358	33,566
Public Service Company of New Mexico
Segment Reporting Information [Line Items]
Gross margin	140,381	108,928
Transmission and distribution costs	13,887	11,611
Depreciation and amortization	43,686	45,790
Utility margin	220,312	199,895
Public Service Company of New Mexico | Energy Production
Segment Reporting Information [Line Items]
Energy production costs	22,358	33,566
Texas-New Mexico Power Company
Segment Reporting Information [Line Items]
Gross margin	46,330	45,312
Transmission and distribution costs	8,309	6,855
Depreciation and amortization	27,440	23,642
Utility margin	82,079	75,809
Texas-New Mexico Power Company | Energy Production
Segment Reporting Information [Line Items]
Energy production costs	0	0
Corporate and Other
Segment Reporting Information [Line Items]
Gross margin	0	0
Transmission and distribution costs	0	0
Depreciation and amortization	0	0
Utility margin	0	0
Corporate and Other | Energy Production
Segment Reporting Information [Line Items]
Energy production costs	$ 0	$ 0

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