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Financing - Schedule of Short-Term Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Short-term Debt [Line Items]
Balance Outstanding	$ 313,800	$ 609,300
PNM
Short-term Debt [Line Items]
Balance Outstanding	158,300	363,800
Texas-New Mexico Power Company
Short-term Debt [Line Items]
Balance Outstanding	0	151,600
Revolving Credit Facility | PNM | PNM Revolving Credit Facility | Line of credit
Short-term Debt [Line Items]
Balance Outstanding	$ 118,300	$ 323,800
Weighted Average Interest Rate	5.49%	5.73%
Revolving Credit Facility | PNM | PNM New Mexico Credit Facility | Line of credit
Short-term Debt [Line Items]
Balance Outstanding	$ 40,000	$ 40,000
Weighted Average Interest Rate	5.51%	5.81%
Revolving Credit Facility | Texas-New Mexico Power Company | TNMP Revolving Credit Facility | Line of credit
Short-term Debt [Line Items]
Balance Outstanding	$ 0	$ 151,600
Weighted Average Interest Rate	0.00%	5.37%
Revolving Credit Facility | TXNM | TXNM Revolving Credit Facility | Line of credit
Short-term Debt [Line Items]
Balance Outstanding	$ 155,500	$ 93,900
Weighted Average Interest Rate	5.77%	5.96%

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- Definition

The effective interest rate at the end of the reporting period.

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- Definition

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