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Electric Operating Revenues - Narrative (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2022 USD ($) utility	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($) utility	Jun. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)
Disaggregation of Revenue [Line Items]
Number of regulated utilities | utility	2		2
Accounts receivable, allowance for credit loss, period increase	$ (700,000)	$ 800,000	$ (1,600,000)	$ 2,400,000
Other receivables, allowance for credit loss, period increase	0	$ 0	0	$ 0
Contract assets	6,200,000		6,200,000		$ 600,000
Texas-New Mexico Power Company
Disaggregation of Revenue [Line Items]
Regulatory assets	800,000		800,000		800,000
PNM
Disaggregation of Revenue [Line Items]
Accounts receivable	$ 98,200,000		$ 98,200,000		$ 86,800,000

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