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Regulatory and Rate Matters - PNM (Details) $ in Thousands |  |  |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Jan. 03, 2024 USD ($) | Jan. 01, 2024 USD ($) | Apr. 17, 2023 USD ($) program | Dec. 05, 2022 USD ($) lease MW | Mar. 31, 2024 USD ($) $ / MWh MW | Mar. 31, 2023 USD ($) | Dec. 31, 2023 USD ($)
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |
Increase in non-fuel based rate | $ 15,300 |  |  |  |  |  |
Regulatory liabilities return period | 2 years |  |  |  |  |  | 2 years
Operating revenues |  |  |  |  | $ (436,877) | $ (544,077) |
Excess return on jurisdictional equity that would require refund |  |  |  |  | 0.50% |  |
PVNGS Leased Interest |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |
Regulatory liability | $ 38,400 |  |  |  |  |  |
Four Corners |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |
Regulatory disallowances | $ 81,000 |  |  |  |  |  |
PNM |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |
Operating revenues |  |  |  |  | $ (308,115) | (430,165) |
Number of leases renewed | lease |  |  |  | 5 |  |  |
Number of megawatts purchased (in megawatts) | MW |  |  |  | 64.1 |  |  |
Renewable Portfolio Standard | PNM |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |
Number of megawatts of Solar PV facilities | MW |  |  |  |  | 158 |  |
Current output in the geothermal facility (in megawatts) | MW |  |  |  |  | 11 |  |
Solar generation capacity (in megawatts) | MW |  |  |  |  | 289.3 |  |
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 |  |  | $ 34,500 |  |  |  |
Program costs related to energy efficiency, in year two |  |  | 35,400 |  |  |  |
Program costs related to energy efficiency, in year three |  |  | $ 36,500 |  |  |  |
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 |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |
Requested return on equity | 9.26% |  |  |  |  |  |
Requested debt capital structure | 50.10% |  |  |  |  |  |
Requested equity capital structure, percentage | 0.29% |  |  |  |  |  |
Requested equity capital structure | 49.61% |  |  |  |  |  |
NM 2022 Rate Case | Palo Verde Nuclear Generating Station |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |
Approved regulatory asset | $ 51,300 |  |  |  |  |  |
Request regulatory asset | 96,300 |  |  |  |  |  |
Disallowance of return | $ 45,000 |  |  |  |  |  |
NM 2022 Rate Case | PNM |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |
Recovery of base rate |  |  |  | $ 2,700,000 |  |  |
NM 2022 Rate Case | PNM | Non-Fuel Energy |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |
Requested rate increase (decrease) |  |  |  | $ 63,800 |  |  |
2024 Rate Change |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |
Regulatory liability |  |  |  |  |  |  | $ 19,200
Deferred Regulatory Liability |  |  |  |  |  |  | 19,200
2024 Rate Change | PVNGS Leased Interest |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  | 38,400
2024 Rate Change | Palo Verde Nuclear Generating Station |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |
Regulatory disallowances |  |  |  |  |  |  | 8,200
2024 Rate Change | Four Corners |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |
Regulatory disallowances |  |  |  |  |  |  | $ 55,500
NMPRC |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |
Requested return on equity |  |  |  | 10.25% |  |  |
Action plan, covered period |  |  |  |  | 3 years |  |
NMPRC | PNM |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |
Proposed revision to rider that will allow for recovery |  | $ 59,000 |  |  |  |  |
NMPRC | Renewable Energy Rider | PNM |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |
Recorded revenues from renewable rider |  |  |  |  | $ 15,300 | $ 18,600 |
Minimum | Energy Efficiency and Load Management Program | PNM |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |
Profit incentive sliding scale multiplier |  |  | 0.071 |  |  |  |
Maximum | Renewable Portfolio Standard | PNM |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |
Reasonable cost threshold in megawatts per hour | $ / MWh |  |  |  |  | 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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