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Significant Accounting Policies and Responsibility for Financial Statements (Details) - USD ($)	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024	Aug. 02, 2024	Aug. 01, 2024
Subsequent Event [Line Items]
Common stock, shares authorized (in shares)	200,000,000
Payment defaults under agreements	$ 0
Gain on sale of NMRD	$ 0	$ 4,449,000
Investment tax credit		$ 15,700,000
Dividends declared per common share (in dollars per share)	$ 0.4075	$ 0.3875
Dividends declared on common stock	$ 38,760,000	$ 34,952,000
Disposal Group, Disposed of by Sale, Not Discontinued Operations | NMRD
Subsequent Event [Line Items]
Proceeds from interests		117,000,000
TXNM
Subsequent Event [Line Items]
Common stock, shares authorized (in shares)				200,000,000	120,000,000
Equity contribution from parent	$ 0	0
Texas-New Mexico Power Company
Subsequent Event [Line Items]
Common stock, shares authorized (in shares)	12,000,000		12,000,000
Dividends declared on common stock	$ 0	0
Public Service Company of New Mexico
Subsequent Event [Line Items]
Common stock, shares authorized (in shares)	40,000,000		40,000,000
Dividends declared on common stock	$ 0	$ 0

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Amount of gain (loss) on sale or disposal of equity in securities of subsidiaries or equity method investee.

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