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Regulatory and Rate Matters - PNM (Details) $ in Thousands					3 Months Ended		12 Months Ended
	Jan. 01, 2025 USD ($)	Nov. 26, 2024 USD ($)	Jun. 14, 2024 USD ($)	Jan. 03, 2024 USD ($)	Mar. 31, 2025 USD ($) MW	Mar. 31, 2024 USD ($)	Dec. 31, 2023 USD ($) program
Public Utilities, General Disclosures [Line Items]
Increase in non-fuel based rate				$ 15,300
Electric Operating Revenues					$ (482,792)	$ (436,877)
Regulatory liabilities return period							2 years
Excess return on jurisdictional equity that would require refund					0.50%
Public Service Company of New Mexico
Public Utilities, General Disclosures [Line Items]
Electric Operating Revenues					$ (333,380)	(308,115)
Public Service Company of New Mexico | NMPRC
Public Utilities, General Disclosures [Line Items]
Proposed revision to rider that will allow for recovery	$ 58,700
2025 Rate Request
Public Utilities, General Disclosures [Line Items]
Requested return on equity		9.45%	10.45%
Requested equity capital structure		51.00%	52.50%
2025 Rate Request | Public Service Company of New Mexico
Public Utilities, General Disclosures [Line Items]
Recovery of base rate			$ 3,000,000
Requested rate increase (decrease)		$ 105,000	174,300
Increase in base rate		$ 82,100	92,200
Increase in revenues from FPPAC			$ 82,100
2024 Rate Change
Public Utilities, General Disclosures [Line Items]
Requested return on equity				9.26%
Requested equity capital structure				49.61%
Requested debt capital structure				50.10%
Requested equity capital structure, percentage				0.29%
Regulatory liability							$ 19,200
Deferred regulatory liability							19,200
2024 Rate Change | PVNGS Leased Interest
Public Utilities, General Disclosures [Line Items]
Electric Operating Revenues							38,400
2024 Rate Change | Four Corners
Public Utilities, General Disclosures [Line Items]
Regulatory disallowances							55,500
2024 Rate Change | Palo Verde Nuclear Generating Station
Public Utilities, General Disclosures [Line Items]
Regulatory disallowances							$ 8,200
Renewable Portfolio Standard | Public Service Company of New Mexico
Public Utilities, General Disclosures [Line Items]
Number of megawatts of Solar PV facilities | MW					158
Current output in the geothermal facility (in megawatts) | MW					11
Solar generation capacity (in megawatts) | MW					314.9
Renewable Portfolio Standard | Public Service Company of New Mexico | New Mexico Wind
Public Utilities, General Disclosures [Line Items]
Number of megawatts for wind energy | MW					200
Renewable Portfolio Standard | Public Service Company of New Mexico | Red Mesa Wind
Public Utilities, General Disclosures [Line Items]
Number of megawatts for wind energy | MW					102
Renewable Portfolio Standard | Public Service Company of New Mexico | La Joya Wind
Public Utilities, General Disclosures [Line Items]
Number of megawatts for wind energy | MW					140
Renewable Energy Rider | Public Service Company of New Mexico | NMPRC
Public Utilities, General Disclosures [Line Items]
Recorded revenues from renewable rider					$ 17,000	$ 15,300
2024 Plan | Public Service Company of New Mexico
Public Utilities, General Disclosures [Line Items]
Program costs related to energy efficiency, number of programs | program							10
Program costs related to energy efficiency, in year one							$ 34,500
Program costs related to energy efficiency, in year two							35,400
Program costs related to energy efficiency, in year three							$ 36,500
Energy Efficiency and Load Management Program | Public Service Company of New Mexico | Minimum
Public Utilities, General Disclosures [Line Items]
Profit incentive sliding scale multiplier							0.071
Energy Efficiency and Load Management Program | Public Service Company of New Mexico | Maximum
Public Utilities, General Disclosures [Line Items]
Profit incentive sliding scale multiplier							0.0882

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