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Regulatory and Rate Matters - Fours Corners, Summer Peak Resource Adequacy, 2026 Resource Application, Grid Modernization Application (Details) $ in Thousands				1 Months Ended	3 Months Ended		12 Months Ended
	Oct. 25, 2023 MW batteryStorageAgreement	Oct. 03, 2022 USD ($)	Jan. 08, 2021 USD ($)	Nov. 30, 2020 USD ($)	Mar. 31, 2024 USD ($)	Mar. 31, 2023 USD ($)	Dec. 31, 2020 USD ($)
Public Utilities, General Disclosures [Line Items]
Electric operating revenues					$ 436,877	$ 544,077
Number of battery storage agreements | batteryStorageAgreement	3
PNM
Public Utilities, General Disclosures [Line Items]
Electric operating revenues					$ 308,115	$ 430,165
Grid modernization investment		$ 344,000
Grid modernization, initial term		6 years
Grid modernization term		11 years
PNM | Four Corners
Public Utilities, General Disclosures [Line Items]
Request issuance of energy transition bonds			$ 300,000
Payments for relief from obligations				$ 15,000			$ 75,000
Final payment for relief from obligations							$ 60,000
PNM | Four Corners | PNM
Public Utilities, General Disclosures [Line Items]
Noncontrolling interest, ownership percentage by noncontrolling owners							13.00%
PNM | Solar Agreement One
Public Utilities, General Disclosures [Line Items]
Number of megawatts available in purchase power agreement (in megawatts) | MW	100
PNM | Solar Agreement Two
Public Utilities, General Disclosures [Line Items]
Number of megawatts available in purchase power agreement (in megawatts) | MW	60
PNM | Battery Storage Agreement One
Public Utilities, General Disclosures [Line Items]
Number of megawatts available in purchase power agreement (in megawatts) | MW	100
PNM | Battery Storage Agreement Two
Public Utilities, General Disclosures [Line Items]
Number of megawatts available in purchase power agreement (in megawatts) | MW	100
PNM | Battery Storage Agreement Three
Public Utilities, General Disclosures [Line Items]
Number of megawatts available in purchase power agreement (in megawatts) | MW	50

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