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Electric Operating Revenues - Narrative (Details) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2024 USD ($) utility | Sep. 30, 2023 USD ($) | Sep. 30, 2024 USD ($) utility | Sep. 30, 2023 USD ($) | Dec. 31, 2023 USD ($)
Disaggregation of Revenue [Line Items] |  |  |  |  |
Number of regulated utilities | utility | 2 |  | 2 |  |
Other receivables, allowance for credit loss, period increase | $ 0 | $ 0 | $ 0 | $ 0 |
Contract assets | 29,600,000 |  | 29,600,000 |  | $ 22,100,000
PNM |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Accounts receivable | $ 103,100,000 |  | $ 103,100,000 |  | $ 93,600,000

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