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Segment Information - Schedule of Gross Margin (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Segment Reporting Information [Line Items]
Gross margin	$ 175,928	$ 186,711
Transmission and distribution costs	22,764	22,196
Depreciation and amortization	83,669	71,126
Utility margin	304,573	302,391
Energy Production
Segment Reporting Information [Line Items]
Energy production costs	22,212	22,358
Public Service Company of New Mexico
Segment Reporting Information [Line Items]
Gross margin	120,854	140,381
Transmission and distribution costs	14,350	13,887
Depreciation and amortization	53,287	43,686
Utility margin	210,703	220,312
Public Service Company of New Mexico | Energy Production
Segment Reporting Information [Line Items]
Energy production costs	22,212	22,358
Texas-New Mexico Power Company
Segment Reporting Information [Line Items]
Gross margin	55,074	46,330
Transmission and distribution costs	8,414	8,309
Depreciation and amortization	30,382	27,440
Utility margin	93,870	82,079
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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