Electric Operating Revenues - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Disaggregation of Revenue [Line Items]
Contracts with customers	$ 2,250,217	$ 1,744,681	$ 1,512,221
Alternative revenue programs	(19,485)	(3,764)	(11,994)
Other electric operating revenue	18,823	38,956	22,785
Electric Operating Revenues	2,249,555	1,779,873	1,523,012
Electricity
Disaggregation of Revenue [Line Items]
Electric Operating Revenues	2,249,555	1,779,873	1,523,012
Transmission
Disaggregation of Revenue [Line Items]
Contracts with customers	263,203	182,032	138,230
Miscellaneous
Disaggregation of Revenue [Line Items]
Contracts with customers	9,207	8,564	9,194
Wholesale energy sales
Disaggregation of Revenue [Line Items]
Contracts with customers	534,196	184,132	50,277
Public Service Company of New Mexico
Disaggregation of Revenue [Line Items]
Contracts with customers	1,747,310	1,327,172	1,120,580
Alternative revenue programs	692	(4,108)	(3,531)
Other electric operating revenue	18,823	38,956	22,785
Electric Operating Revenues	1,766,825	1,362,020	1,139,834
Public Service Company of New Mexico | Transmission
Disaggregation of Revenue [Line Items]
Contracts with customers	149,421	87,880	59,856
Public Service Company of New Mexico | Miscellaneous
Disaggregation of Revenue [Line Items]
Contracts with customers	5,390	4,770	5,456
Public Service Company of New Mexico | Wholesale energy sales
Disaggregation of Revenue [Line Items]
Contracts with customers	534,196	184,132	50,277
Texas-New Mexico Power Company
Disaggregation of Revenue [Line Items]
Contracts with customers	502,907	417,509	391,641
Alternative revenue programs	(20,177)	344	(8,463)
Other electric operating revenue	0	0	0
Electric Operating Revenues	482,730	417,853	383,178
Texas-New Mexico Power Company | Transmission
Disaggregation of Revenue [Line Items]
Contracts with customers	113,782	94,152	78,374
Texas-New Mexico Power Company | Miscellaneous
Disaggregation of Revenue [Line Items]
Contracts with customers	3,817	3,794	3,738
Texas-New Mexico Power Company | Wholesale energy sales
Disaggregation of Revenue [Line Items]
Contracts with customers	0	0	0
Residential | Electricity
Disaggregation of Revenue [Line Items]
Contracts with customers	672,650	643,516	640,918
Residential | Public Service Company of New Mexico | Electricity
Disaggregation of Revenue [Line Items]
Contracts with customers	484,699	484,720	482,852
Residential | Texas-New Mexico Power Company | Electricity
Disaggregation of Revenue [Line Items]
Contracts with customers	187,951	158,796	158,066
Commercial | Electricity
Disaggregation of Revenue [Line Items]
Contracts with customers	576,222	544,787	510,500
Commercial | Public Service Company of New Mexico | Electricity
Disaggregation of Revenue [Line Items]
Contracts with customers	422,163	419,251	392,257
Commercial | Texas-New Mexico Power Company | Electricity
Disaggregation of Revenue [Line Items]
Contracts with customers	154,059	125,536	118,243
Industrial | Electricity
Disaggregation of Revenue [Line Items]
Contracts with customers	122,021	117,568	118,212
Industrial | Public Service Company of New Mexico | Electricity
Disaggregation of Revenue [Line Items]
Contracts with customers	85,102	88,479	90,845
Industrial | Texas-New Mexico Power Company | Electricity
Disaggregation of Revenue [Line Items]
Contracts with customers	36,919	29,089	27,367
Public authority | Electricity
Disaggregation of Revenue [Line Items]
Contracts with customers	27,709	28,862	28,979
Public authority | Public Service Company of New Mexico | Electricity
Disaggregation of Revenue [Line Items]
Contracts with customers	21,330	22,720	23,126
Public authority | Texas-New Mexico Power Company | Electricity
Disaggregation of Revenue [Line Items]
Contracts with customers	6,379	6,142	5,853
Economy energy service | Electricity
Disaggregation of Revenue [Line Items]
Contracts with customers	45,009	35,220	15,911
Economy energy service | Public Service Company of New Mexico | Electricity
Disaggregation of Revenue [Line Items]
Contracts with customers	45,009	35,220	15,911
Economy energy service | Texas-New Mexico Power Company | Electricity
Disaggregation of Revenue [Line Items]
Contracts with customers	$ 0	$ 0	$ 0