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Electric Operating Revenues - Narrative (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2025 USD ($) utility	Sep. 30, 2024 USD ($)	Sep. 30, 2025 USD ($) utility	Sep. 30, 2024 USD ($)	Dec. 31, 2024 USD ($)
Disaggregation of Revenue [Line Items]
Number of regulated utilities | utility	2		2
Other receivables, allowance for credit loss, period increase	$ 0	$ 0	$ 0	$ 0
Contract assets	39,100,000		39,100,000		$ 32,000,000
PNM
Disaggregation of Revenue [Line Items]
Accounts receivable	$ 139,900,000		$ 139,900,000		$ 94,300,000

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