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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 ($)	Jun. 13, 2025 MW power_purchase_agreement energy_storage_agreement	Mar. 12, 2025 MW	Dec. 30, 2024 MW	Nov. 22, 2024 MW	Oct. 31, 2022 USD ($)
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, maintenance cost	0.18
Grid modernization, investment increase period	6 years
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
Megawatts purchase power agreements period		20 years
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
Power Purchase Agreement
Public Utilities, General Disclosures [Line Items]
Number of megawatts purchase power agreements (in megawatts) \| power_purchase_agreement		3
Number of megawatts available in purchase power agreement (in megawatts)		290
Megawatts purchase power agreements period		20 years