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Regulatory and Rate Matters - Transportation and Electrification Program (TEP) (Narrative) (Details) - PNM - USD ($) $ in Millions | Feb. 23, 2024 | Jun. 01, 2023
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Public Utilities, General Disclosures [Line Items] |  |
Expected budgeted expenditures | $ 4.0 | $ 37.1
Budget period | 3 years | 3 years
Budge dedication to low-income customers |  | 22.00%
Budget dedication to low-income customers |  | $ 8.0
Revised budget | $ 32.9 |

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