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Electric Operating Revenues - Narrative (Details) $ in Millions | Dec. 31, 2023 USD ($) MW | Dec. 31, 2022 USD ($) | May 31, 2022 MW | Jan. 01, 2019 | Jan. 01, 2018 MW
--- | --- | --- | --- | --- | ---
Contract with Customers, Asset and Liability [Roll Forward] |  |  |  |  |
Capitalized contract cost, amortization period |  |  |  | 5 years |
Contract assets | $ | $ 22.1 | $ 11.9 |  |  |
PNM |  |  |  |  |
Contract with Customers, Asset and Liability [Roll Forward] |  |  |  |  |
Expected exposure to market risk (in megawatts) | MW | 65 |  |  |  | 65
Power to be sold to third party (in megawatts) | MW | 36 |  | 50 |  | 36
Contract with customers, net | $ | $ 93.6 | $ 151.4 |  |  |

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