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Regulatory and Rate Matters - Schedule of Renewable Energy Rider (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
PNM | Renewable energy rider | NMPRC |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Revenue from renewable energy rider | $ 56.9 | $ 60.3 | $ 61.7

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