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Financing - Short-Term Debt and Liquidity (Narrative) (Details)		12 Months Ended
	Apr. 01, 2024 USD ($) extension_option	Dec. 31, 2024 USD ($) extension_option	May 20, 2022 USD ($)	May 13, 2022 USD ($)	Mar. 11, 2022 USD ($)
Short-term Debt [Line Items]
Letters of credit outstanding		$ 3,100,000
JPMorgan Chase Bank, N.A.
Short-term Debt [Line Items]
Letters of credit outstanding		30,300,000
PNM
Short-term Debt [Line Items]
Letters of credit outstanding		0
PNM | Lines of Credit
Short-term Debt [Line Items]
NMPRC approved credit facility			$ 40,000,000
TNMP
Short-term Debt [Line Items]
Letters of credit outstanding		0
TNMP | Revolving Credit Facility
Short-term Debt [Line Items]
Financing capacity	$ 200,000,000	$ 200,000,000		$ 100,000,000	$ 100,000,000
Number of extensions | extension_option	2	2
Extension period	1 year	1 year
TNMP | Revolving Credit Facility | 9.50% due April 2019
Short-term Debt [Line Items]
Collateral amount				$ 100,000,000
TNMP | Revolving Credit Facility | First Mortgage Bonds Due 2029
Short-term Debt [Line Items]
Collateral amount		$ 200,000,000
TXNM Revolving Credit Facility
Short-term Debt [Line Items]
Financing capacity		$ 300,000,000.0
TXNM Revolving Credit Facility | PNM Resources
Short-term Debt [Line Items]
Interest rates on outstanding borrowings (as a percent)		5.96%
PNM Revolving Credit Facility | PNM Resources
Short-term Debt [Line Items]
Interest rates on outstanding borrowings (as a percent)		5.73%
PNM Revolving Credit Facility | PNM
Short-term Debt [Line Items]
Financing capacity		$ 400,000,000.0
TNMP Revolving Credit Facility | PNM Resources
Short-term Debt [Line Items]
Interest rates on outstanding borrowings (as a percent)		5.37%
PNM New Mexico Credit Facility | PNM Resources
Short-term Debt [Line Items]
Interest rates on outstanding borrowings (as a percent)		5.81%

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
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-Publisher FASB
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-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
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