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Regulatory and Rate Matters - Energy Efficiency and Load Management (Narrative) (Details) - PNM $ in Millions | 12 Months Ended
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Dec. 31, 2023 USD ($) program | Dec. 31, 2020 USD ($) GWh MMBTU program
Energy Efficiency and Load Management Program |  |
Public Utilities, General Disclosures [Line Items] |  |
Number of programs | program |  | 12
Program costs related to energy efficiency, in year one |  | $ 31.4
Program costs related to energy efficiency, in year two |  | 31.0
Program costs related to energy efficiency, in year three |  | $ 29.6
2021 Energy Efficiency Annual Report | Disincentives and Incentives Added |  |
Public Utilities, General Disclosures [Line Items] |  |
Energy efficiency and load management programs targeted energy savings (in Gigawatts) | GWh |  | 94
Energy Efficiency and Load Management Program, 2024 |  |
Public Utilities, General Disclosures [Line Items] |  |
Number of programs | program | 10 |
Program costs related to energy efficiency, in year one | $ 34.5 |
Program costs related to energy efficiency, in year two | 35.4 |
Program costs related to energy efficiency, in year three | $ 36.5 |
Minimum | Energy Efficiency and Load Management Program |  |
Public Utilities, General Disclosures [Line Items] |  |
Profit incentive sliding scale multiplier | 0.071 |
Minimum | Renewable Portfolio Standard |  |
Public Utilities, General Disclosures [Line Items] |  |
Profit incentive sliding scale multiplier |  | 0.071
Energy efficiency and load management programs targeted energy savings (in Gigawatts) | MMBTU |  | 80
Maximum | Energy Efficiency and Load Management Program |  |
Public Utilities, General Disclosures [Line Items] |  |
Profit incentive sliding scale multiplier | 0.0882 |

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