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Financing - Short-term Debt and Liquidity (Details)		1 Months Ended			9 Months Ended
	Apr. 01, 2024 USD ($) extension_option	Aug. 31, 2025 USD ($)	May 31, 2025 USD ($)	Feb. 28, 2025 USD ($)	Sep. 30, 2024 USD ($) extension_option	Dec. 31, 2023 USD ($)	May 20, 2022 USD ($)	Mar. 11, 2022 USD ($)
Short-term Debt [Line Items]
Letters of credit outstanding					$ 3,100,000
Short-term debt					459,000,000	$ 261,900,000
PNMR Development
Short-term Debt [Line Items]
Notes payable					0	0
WEB LOC Facility | TXNM Revolving Credit Facility
Short-term Debt [Line Items]
Letters of credit outstanding					30,300,000
ETBC 1 | Forecast
Short-term Debt [Line Items]
Scheduled payments		$ 3,500,000		$ 3,400,000
PNM 2023 Note Purchase Agreement | Forecast
Short-term Debt [Line Items]
Scheduled payments		$ 250,000,000	$ 104,000,000
TXNM 2021 Delayed Draw Term Loan | Bonds
Short-term Debt [Line Items]
Long-term debt					51,000,000
PNM
Short-term Debt [Line Items]
Letters of credit outstanding					0
Short-term debt					179,900,000	137,500,000
PNM | Lines of credit
Short-term Debt [Line Items]
NMPRC approved credit facility							$ 40,000,000.0
TNMP
Short-term Debt [Line Items]
Letters of credit outstanding					0
Short-term debt					97,500,000	55,100,000
PNMR Development | TXNM
Short-term Debt [Line Items]
Short-term debt					0	$ 2,300,000
Revolving credit facility
Short-term Debt [Line Items]
Financing capacity					300,000,000.0
Revolving credit facility | PNM
Short-term Debt [Line Items]
Financing capacity					400,000,000.0
Revolving credit facility | TXNM and PNM
Short-term Debt [Line Items]
Number of extensions | extension_option	2
Extension period	1 year
Revolving credit facility | TNMP
Short-term Debt [Line Items]
Financing capacity	$ 200,000,000				$ 200,000,000			$ 100,000,000
Number of extensions | extension_option					2
Extension period					1 year
Revolving credit facility | TNMP | First Mortgage Bonds Due 2029
Short-term Debt [Line Items]
Collateral amount					$ 200,000,000

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