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Financing - Financing Activities - ETBC I (Narrative) (Details)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Nov. 15, 2023 USD ($) tranche
Debt Instrument [Line Items]
Current installments of long-term debt	$ 611,603,000	$ 280,169,000
PNM
Debt Instrument [Line Items]
Current installments of long-term debt	560,637,000	200,222,000
Securitized Bonds
Debt Instrument [Line Items]
Current installments of long-term debt	6,907,000	2,529,000
Securitized Bonds \| PNM
Debt Instrument [Line Items]
Current installments of long-term debt	$ 6,907,000	$ 2,529,000
Securitized Bonds \| Senior Secured Notes, Energy Transition Bonds \| PNM
Debt Instrument [Line Items]
Aggregate principal amount			$ 343,200,000
Number of tranches \| tranche			2
Securitized Bonds, 5.64% \| Senior Secured Notes, Energy Transition Bonds \| PNM
Debt Instrument [Line Items]
Aggregate principal amount			$ 175,000,000
Stated percentage (as a percent)			5.64%
Securitized Bonds, 6.03% \| Senior Secured Notes, Energy Transition Bonds \| PNM
Debt Instrument [Line Items]
Aggregate principal amount			$ 168,200,000
Stated percentage (as a percent)			6.03%