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Electric Operating Revenues - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Contracts with customers									$ 1,469,799	$ 1,377,208	$ 1,359,740
Alternative revenue programs									(11,994)	(542)	1,756
Other electric operating revenue									65,207	80,937	75,117
Total electric operating revenues	$ 359,276	$ 472,465	$ 357,649	$ 333,622	$ 344,144	$ 433,586	$ 330,228	$ 349,645	1,523,012	1,457,603	1,436,613
Electricity
Disaggregation of Revenue [Line Items]
Total electric operating revenues									1,523,012	1,457,603	1,436,613
Transmission
Disaggregation of Revenue [Line Items]
Contracts with customers									138,230	124,162	121,271
Miscellaneous
Disaggregation of Revenue [Line Items]
Contracts with customers									17,049	16,702	23,081
Public Service Company of New Mexico
Disaggregation of Revenue [Line Items]
Contracts with customers									1,078,158	1,010,898	1,019,291
Alternative revenue programs									(3,531)	1,987	(2,443)
Other electric operating revenue									65,207	80,937	75,117
Total electric operating revenues	266,409	364,504	260,788	248,133	255,172	331,113	238,219	269,318	1,139,834	1,093,822	1,091,965
Public Service Company of New Mexico | Transmission
Disaggregation of Revenue [Line Items]
Contracts with customers									59,856	57,214	54,280
Public Service Company of New Mexico | Miscellaneous
Disaggregation of Revenue [Line Items]
Contracts with customers									13,311	13,134	14,098
Texas-New Mexico Power Company
Disaggregation of Revenue [Line Items]
Contracts with customers									391,641	366,310	340,449
Alternative revenue programs									(8,463)	(2,529)	4,199
Other electric operating revenue									0	0	0
Total electric operating revenues	$ 92,867	$ 107,961	$ 96,861	$ 85,489	$ 88,972	$ 102,473	$ 92,009	$ 80,327	383,178	363,781	344,648
Texas-New Mexico Power Company | Transmission
Disaggregation of Revenue [Line Items]
Contracts with customers									78,374	66,948	66,991
Texas-New Mexico Power Company | Miscellaneous
Disaggregation of Revenue [Line Items]
Contracts with customers									3,738	3,568	8,983
Residential | Electricity
Disaggregation of Revenue [Line Items]
Contracts with customers									640,918	578,625	563,297
Residential | Public Service Company of New Mexico | Electricity
Disaggregation of Revenue [Line Items]
Contracts with customers									482,852	427,883	433,009
Residential | Texas-New Mexico Power Company | Electricity
Disaggregation of Revenue [Line Items]
Contracts with customers									158,066	150,742	130,288
Commercial | Electricity
Disaggregation of Revenue [Line Items]
Contracts with customers									510,500	513,940	519,594
Commercial | Public Service Company of New Mexico | Electricity
Disaggregation of Revenue [Line Items]
Contracts with customers									392,257	396,987	408,333
Commercial | Texas-New Mexico Power Company | Electricity
Disaggregation of Revenue [Line Items]
Contracts with customers									118,243	116,953	111,261
Industrial | Electricity
Disaggregation of Revenue [Line Items]
Contracts with customers									118,212	92,006	78,436
Industrial | Public Service Company of New Mexico | Electricity
Disaggregation of Revenue [Line Items]
Contracts with customers									90,845	69,601	61,119
Industrial | Texas-New Mexico Power Company | Electricity
Disaggregation of Revenue [Line Items]
Contracts with customers									27,367	22,405	17,317
Public authority | Electricity
Disaggregation of Revenue [Line Items]
Contracts with customers									28,979	26,016	27,297
Public authority | Public Service Company of New Mexico | Electricity
Disaggregation of Revenue [Line Items]
Contracts with customers									23,126	20,322	21,688
Public authority | Texas-New Mexico Power Company | Electricity
Disaggregation of Revenue [Line Items]
Contracts with customers									5,853	5,694	5,609
Economy energy service | Electricity
Disaggregation of Revenue [Line Items]
Contracts with customers									15,911	25,757	26,764
Economy energy service | Public Service Company of New Mexico | Electricity
Disaggregation of Revenue [Line Items]
Contracts with customers									15,911	25,757	26,764
Economy energy service | Texas-New Mexico Power Company | Electricity
Disaggregation of Revenue [Line Items]
Contracts with customers									$ 0	$ 0	$ 0

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