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Significant Accounting Policies and Responsibility for Financial Statements (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024	Aug. 02, 2024	Aug. 01, 2024
Subsequent Event [Line Items]
Common stock, shares authorized (in shares)	200,000,000		200,000,000		200,000,000
Payment defaults under agreements	$ 0		$ 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	$ 0.8150	$ 0.7750
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
PNMR Development | NMRD
Subsequent Event [Line Items]
Contribution to construction activities				12,600,000
TXNM
Subsequent Event [Line Items]
Common stock, shares authorized (in shares)						200,000,000	120,000,000
Equity contribution from parent	$ 250,000,000	$ 0	250,000,000	0
Dividends declared on common stock	$ 0	0	$ 0	0
Public Service Company of New Mexico
Subsequent Event [Line Items]
Common stock, shares authorized (in shares)	40,000,000		40,000,000		40,000,000
Equity contribution from parent	$ 0	55,000,000.0	$ 0	55,000,000
Dividends declared on common stock	$ 0	$ 0	$ 0	$ 0

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