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Regulatory and Rate Matters - PNM (Details) $ in Millions |  |  |  |  |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 01, 2023 USD ($) | Apr. 17, 2023 USD ($) program | Jan. 03, 2023 USD ($) | Jan. 01, 2023 USD ($) | Dec. 05, 2022 USD ($) MW | Apr. 15, 2020 USD ($) MMBTU program | Sep. 30, 2023 USD ($) $ / MWh MW | Sep. 30, 2022 USD ($) | Sep. 30, 2023 USD ($) lease $ / MWh MW | Sep. 30, 2022 USD ($)
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Excess return on jurisdictional equity that would require refund |  |  |  |  |  |  | 0.50% |  | 0.50% |
Return on equity |  |  |  |  |  |  |  |  | 10.173% |
Approved return on equity |  |  |  |  |  |  |  |  | 10.075% |
Allowed return on equity |  |  |  |  |  |  |  |  | 9.575% |
Allowed return on equity, additional |  |  |  |  |  |  |  |  | 0.50% |
PNM |  |  |  |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Approved equity capital structure |  |  |  |  |  |  |  |  | 52.00% |
Approved debt capital structure |  |  |  |  |  |  |  |  | 48.00% |
Number of leases renewed | lease |  |  |  |  |  |  |  |  | 5 |
Number of megawatts purchased (in megawatts) | MW |  |  |  |  |  |  | 64.1 |  | 64.1 |
Non-recurring costs |  |  | $ 98.3 |  |  |  |  |  |  |
Renewable Portfolio Standard | PNM |  |  |  |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Number of megawatts of Solar PV facilities | MW |  |  |  |  |  |  | 158 |  | 158 |
Current output in the geothermal facility (in megawatts) | MW |  |  |  |  |  |  | 11 |  | 11 |
Solar generation capacity (in megawatts) | MW |  |  |  |  |  |  | 273.9 |  | 273.9 |
Energy Efficiency and Load Management Program | PNM |  |  |  |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Program costs related to energy efficiency, 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 |  |  |  |
Energy efficiency and load management programs targeted energy savings (in Gigawatts) | MMBTU |  |  |  |  |  | 94 |  |  |  |
2024 Plan | PNM |  |  |  |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Program costs related to energy efficiency, 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 |  |  |  |  |  |  |  |
Integrated Resource Plan, 2011 | PNM |  |  |  |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Frequency of IRP filings |  |  |  |  |  |  |  |  | 3 years |
Planning period covered of IRP |  |  |  |  |  |  |  |  | 20 years |
NM 2022 Rate Case | PNM |  |  |  |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Recovery of base rate |  |  |  |  | $ 2,700.0 |  |  |  |  |
Revenue deficiency driver, years of operation |  |  |  |  | 6 years |  |  |  |  |
Leased PVNGS capacity, expiration | MW |  |  |  |  | 114 |  |  |  |  |
NM 2022 Rate Case | PNM | Non-Fuel Energy |  |  |  |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) |  |  |  |  | $ 63.8 |  |  |  |  |
NMPRC |  |  |  |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Requested return on equity |  |  |  |  | 10.25% |  |  |  |  |
Action plan, covered period |  |  |  |  |  |  |  |  | 4 years |
NMPRC | PNM |  |  |  |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Proposed revision to rider that will allow for recovery | $ 59.0 |  |  | $ 61.0 |  |  |  |  |  |
NMPRC | Renewable Energy Rider | PNM |  |  |  |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Recorded revenues from renewable rider |  |  |  |  |  |  | $ 13.0 | $ 12.7 | $ 47.0 | $ 44.5
Minimum | Renewable Portfolio Standard | PNM |  |  |  |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Energy efficiency and load management programs targeted energy savings (in Gigawatts) | MMBTU |  |  |  |  |  | 80 |  |  |  |
Minimum | Energy Efficiency and Load Management Program | PNM |  |  |  |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Profit incentive sliding scale multiplier |  | 0.071 |  |  |  | 0.071 |  |  |  |
Maximum | Renewable Portfolio Standard | PNM |  |  |  |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Reasonable cost threshold in megawatts per hour | $ / MWh |  |  |  |  |  |  | 60 |  | 60 |
Maximum | Energy Efficiency and Load Management Program | PNM |  |  |  |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Profit incentive sliding scale multiplier |  | 0.0882 |  |  |  |  |  |  |  |
New Mexico Wind | Renewable Portfolio Standard 2014 | PNM |  |  |  |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Number of megawatts for wind energy | MW |  |  |  |  |  |  |  |  | 200 |
Red Mesa Wind | Renewable Portfolio Standard 2014 | PNM |  |  |  |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Number of megawatts for wind energy | MW |  |  |  |  |  |  |  |  | 102 |
La Joya Wind | Renewable Portfolio Standard | PNM |  |  |  |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Number of megawatts for wind energy | MW |  |  |  |  |  |  |  |  | 140 |

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