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v3.25.2

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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