Variable Interest Entities - Additional Information (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($) MW	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Jan. 31, 2016 USD ($)
Results of Operations
Earnings attributable to non-controlling interest	$ 15,122	$ 15,490	$ 14,013
Financial Position
Current assets	410,978	324,600
Total assets	9,257,377	8,666,885	7,939,854
Current liabilities	890,370	664,213
Owners’ equity – non-controlling interest	$ 52,994	55,405
Public Service Company of New Mexico
Variable Interest Entity [Line Items]
Number of megawatts purchased (in megawatts) | MW	64.1
Results of Operations
Earnings attributable to non-controlling interest	$ 15,122	15,490	14,013
Financial Position
Current assets	345,645	266,689
Total assets	6,272,166	6,060,133
Current liabilities	692,155	495,902
Owners’ equity – non-controlling interest	$ 52,994	55,405
Public Service Company of New Mexico | Valencia
Variable Interest Entity [Line Items]
Number of megawatts purchased (in megawatts) | MW	155
Payment for fixed charges	$ 19,500	19,800	20,000
Payment for variable charges	$ 1,900	1,900	1,400
Purchase price, percentage of the book value reduced by related indebtedness	50.00%
Purchase price, percentage of fair market value	50.00%
Results of Operations
Operating revenues	$ 21,403	21,624	21,297
Operating expenses	6,281	6,134	7,284
Earnings attributable to non-controlling interest	15,122	15,490	$ 14,013
Financial Position
Current assets	3,429	3,042
Net property, plant and equipment	50,094	52,908
Total assets	53,523	55,950
Current liabilities	529	545
Owners’ equity – non-controlling interest	$ 52,994	$ 55,405
Public Service Company of New Mexico | Maximum | Valencia
Variable Interest Entity [Line Items]
Option to purchase a percentage of the plant or VIE (up to )	50.00%
NM Capital | Coal Supply | San Juan Generating Station
Financial Position
Issuance in letters of credit	$ 30,300			$ 30,300