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Financing - Schedule of Short-Term Debt (Details) - USD ($) $ in Thousands | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Short-term Debt [Line Items] |  |
Balance Outstanding | $ 345,700 | $ 609,300
PNM |  |
Short-term Debt [Line Items] |  |
Balance Outstanding | 234,600 | 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 | $ 194,600 | $ 323,800
Weighted Average Interest Rate | 5.66% | 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 | 5.67% | 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 | $ 111,100 | $ 93,900
Weighted Average Interest Rate | 5.92% | 5.96%

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