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Fair Value of Derivative and Other Financial Instruments - Narrative (Details)	1 Months Ended	3 Months Ended		4 Months Ended	12 Months Ended
	Apr. 30, 2025 MW	Mar. 31, 2025 USD ($)	Mar. 31, 2024 USD ($)	Feb. 28, 2025 MW	Dec. 31, 2024 USD ($) MW
Debt Securities, Available-for-sale [Line Items]
Obligations to return cash		$ 0			$ 0
Public Service Company of New Mexico
Debt Securities, Available-for-sale [Line Items]
Amounts recognized for right to reclaim cash		0			0
Cash collateral under margin arrangements		0			100,000
Available-for-sale debt securities		54,684,000
(Increase)/decrease in other than temporary losses of available-for-sale securities, net portion recognized in earnings		0	$ 13,400,000
Public Service Company of New Mexico | Recurring
Debt Securities, Available-for-sale [Line Items]
Available-for-sale debt securities		428,122,000			453,421,000
Public Service Company of New Mexico | Recurring | Nuclear Decommissioning Trust
Debt Securities, Available-for-sale [Line Items]
Available-for-sale debt securities		384,900,000			384,600,000
Public Service Company of New Mexico | Recurring | SJGS Decommissioning Trust
Debt Securities, Available-for-sale [Line Items]
Available-for-sale debt securities		6,100,000			8,200,000
Public Service Company of New Mexico | Recurring | Mine Reclamation Trust
Debt Securities, Available-for-sale [Line Items]
Available-for-sale debt securities		$ 79,200,000			$ 82,700,000
Portfolio One | Public Service Company of New Mexico
Debt Securities, Available-for-sale [Line Items]
Number of megawatts available in purchase power agreement (in megawatts) | MW				225	150
Portfolio One | Public Service Company of New Mexico | Subsequent Event
Debt Securities, Available-for-sale [Line Items]
Number of megawatts available in purchase power agreement (in megawatts) | MW	25
Portfolio Two | Public Service Company of New Mexico
Debt Securities, Available-for-sale [Line Items]
Number of megawatts available in purchase power agreement (in megawatts) | MW					100

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