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Regulatory and Rate Matters - 2023 IRP, 2028 Resource Application, Grid Modernization Application (Details) - Public Service Company of New Mexico $ in Millions						1 Months Ended
	Jun. 20, 2025 USD ($)	Jun. 13, 2025 MW energy_storage_agreement	Mar. 12, 2025 MW	Dec. 30, 2024 MW	Nov. 22, 2024 MW	Oct. 31, 2022 USD ($)
Public Utilities, General Disclosures [Line Items]
Request for proposal, new energy resource, megawatts				900
Grid modernization investment | $	$ 367					$ 344
Grid modernization, initial term						6 years
Grid modernization term						11 years
Grid modernization, investment increase period	6 years
Grid modernization, maintenance cost	0.18
RFP Request, Period One
Public Utilities, General Disclosures [Line Items]
Request for proposal, new energy resource, megawatts				500
RFP Request, Period Two | Minimum
Public Utilities, General Disclosures [Line Items]
Request for proposal, new energy resource, megawatts				900
RFP Request, Period Two | Maximum
Public Utilities, General Disclosures [Line Items]
Request for proposal, new energy resource, megawatts				2,900
Energy Storage Agreements
Public Utilities, General Disclosures [Line Items]
Number of megawatts purchase power agreements (in megawatts)		3			2
Number of megawatts available in purchase power agreement (in megawatts)		268			150
Purchased Power Agreements
Public Utilities, General Disclosures [Line Items]
Number of megawatts available in purchase power agreement (in megawatts)					167
Certificate Of Convenience And Necessity, Solar Facility
Public Utilities, General Disclosures [Line Items]
Number of megawatts available in purchase power agreement (in megawatts)					100
Certificate Of Convenience And Necessity, Battery
Public Utilities, General Disclosures [Line Items]
Number of megawatts available in purchase power agreement (in megawatts)			30		30
Public utilities, number of megawatts available in purchase power agreement, increase			20		20

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