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Regulatory and Rate Matters - Renewable Energy Rider (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Public Service Company of New Mexico | Renewable Energy Rider | NMPRC |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Revenue from renewable energy rider | $ 61.7 | $ 56.4 | $ 52.0

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