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Financing - Short-term Debt and Liquidity (Details)		1 Months Ended				3 Months Ended
	Apr. 01, 2024 extension_option	Feb. 28, 2026 USD ($)	Nov. 30, 2025 USD ($)	Aug. 31, 2025 USD ($)	May 31, 2025 USD ($)	Mar. 31, 2025 USD ($) extension_option	Dec. 31, 2024 USD ($)	May 20, 2022 USD ($)
Short-term Debt [Line Items]
Letters of credit outstanding						$ 3,100,000
PNMR Development
Short-term Debt [Line Items]
Notes payable						1,600,000	$ 1,500,000
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		$ 3,600,000		$ 3,500,000
PNM 2023 Note Purchase Agreement | Forecast
Short-term Debt [Line Items]
Scheduled payments				$ 250,000,000	$ 104,000,000
PNM 2024 Note Purchase Agreement | Forecast
Short-term Debt [Line Items]
Scheduled payments			$ 200,000,000
TXNM 2021 Delayed Draw Term Loan | Bonds
Short-term Debt [Line Items]
Long-term debt						51,000,000
Public Service Company of New Mexico
Short-term Debt [Line Items]
Letters of credit outstanding						0
Public Service Company of New Mexico | Lines of credit
Short-term Debt [Line Items]
NMPRC approved credit facility								$ 40,000,000.0
Texas-New Mexico Power Company
Short-term Debt [Line Items]
Letters of credit outstanding						0
Texas-New Mexico Power Company | TNMP FMBs 2026 Bond Purchase Agreement at 3.53% Due February 2026 | Bonds
Short-term Debt [Line Items]
Aggregate principal amount						$ 60,000,000
Stated interest rate						3.53%
PNM and TNMP | Pollution Control Revenue Bonds | Bonds
Short-term Debt [Line Items]
Long-term debt						$ 1,600,000	$ 0
Revolving credit facility
Short-term Debt [Line Items]
Financing capacity						300,000,000.0
Revolving credit facility | Public Service Company of New Mexico
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 | Texas-New Mexico Power Company
Short-term Debt [Line Items]
Financing capacity						$ 200,000,000
Number of extensions | extension_option						2
Extension period						1 year
Revolving credit facility | Texas-New Mexico Power Company | First Mortgage Bonds Due 2029
Short-term Debt [Line Items]
Collateral amount						$ 200,000,000

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