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Electric Operating Revenues - Narrative (Details)	3 Months Ended
	Mar. 31, 2024 USD ($) utility	Mar. 31, 2023 USD ($)	Dec. 31, 2023 USD ($)
Disaggregation of Revenue [Line Items]
Number of regulated utilities | utility	2
Other receivables, allowance for credit loss, period increase	$ 0	$ 0
Contract assets	24,600,000		$ 22,100,000
PNM
Disaggregation of Revenue [Line Items]
Accounts receivable	$ 75,400,000		$ 93,600,000

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