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Financing - Short-term Debt and Liquidity (Details)		1 Months Ended			6 Months Ended	13 Months Ended
	Apr. 01, 2024 extension_option	Feb. 28, 2026 USD ($)	Nov. 30, 2025 USD ($)	Aug. 31, 2025 USD ($)	Jun. 30, 2025 USD ($) extension_option	Jul. 31, 2026 USD ($)	Dec. 31, 2024 USD ($)	May 20, 2022 USD ($)
Short-term Debt [Line Items]
Letters of credit outstanding					$ 3,100,000
ETBC 1 | Forecast
Short-term Debt [Line Items]
Scheduled payments		$ 3,600,000		$ 3,500,000
PNM 2024 Note Purchase Agreement | Forecast
Short-term Debt [Line Items]
Scheduled payments			$ 200,000,000
PNM 2025 Note Purchase Agreement | Forecast
Short-term Debt [Line Items]
Scheduled payments						$ 195,000,000
TXNM 2023 Note Purchase Agreement | Forecast
Short-term Debt [Line Items]
Scheduled payments						$ 210,000,000.0
Public Service Company of New Mexico
Short-term Debt [Line Items]
Letters of credit outstanding					0
TXNM and PNM
Short-term Debt [Line Items]
Notes payable					1,600,000		$ 1,500,000
Texas-New Mexico Power Company
Short-term Debt [Line Items]
Letters of credit outstanding					0
Texas-New Mexico Power Company | Pollution Control Revenue Bonds | Bonds
Short-term Debt [Line Items]
Long-term debt					0		0
PNM and TNMP | Pollution Control Revenue Bonds | Bonds
Short-term Debt [Line Items]
Long-term debt					0		$ 0
Revolving Credit Facility | Line of credit
Short-term Debt [Line Items]
Financing capacity					300,000,000.0
Revolving Credit Facility | Line of credit | Public Service Company of New Mexico
Short-term Debt [Line Items]
Financing capacity					400,000,000.0
Revolving Credit Facility | Line of credit | Public Service Company of New Mexico | PNM New Mexico Credit Facility
Short-term Debt [Line Items]
NMPRC approved credit facility								$ 40,000,000.0
Revolving Credit Facility | Line of credit | TXNM and PNM
Short-term Debt [Line Items]
Number of extensions | extension_option	2
Extension period	1 year
Revolving Credit Facility | Line of credit | 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 | Line of credit | Texas-New Mexico Power Company | First Mortgage Bonds Due 2029
Short-term Debt [Line Items]
Collateral amount					$ 200,000,000
TXNM Revolving Credit Facility | WEB LOC Facility
Short-term Debt [Line Items]
Letters of credit outstanding					$ 30,300,000

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