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Regulatory and Rate Matters - PNM (Details) |  |  |  |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 01, 2021 USD ($) | Apr. 15, 2021 USD ($) GWh | Jan. 29, 2021 | Jan. 01, 2021 USD ($) | Apr. 15, 2020 USD ($) MMBTU meter | Jun. 30, 2021 USD ($) MW | Jun. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) MW | Jun. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) GWh | Jul. 29, 2020 MW
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Excess return on jurisdictional equity that would require refund |  |  |  |  |  | 0.50% |  | 0.50% |  |  |
PNM |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Solar generation capacity (in megawatts) | MW |  |  |  |  |  |  |  |  |  |  | 650
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 |  |  |  |  |  | 180.2 |  | 180.2 |  |  |
Energy Efficiency and Load Management Program | PNM |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Energy efficiency and load management programs targeted energy savings (in Gigawatts) | MMBTU |  |  |  |  | 80 |  |  |  |  |  |
Program costs related to energy efficiency, in year two |  |  |  |  | $ 31,400,000 |  |  |  |  |  |
Program costs related to energy efficiency, in year three |  |  |  |  | 31,000,000.0 |  |  |  |  |  |
Program costs related to energy efficiency, in year four |  |  |  |  | $ 29,600,000 |  |  |  |  |  |
Number of AMI meters to be installed | meter |  |  |  |  | 5,000 |  |  |  |  |  |
Program costs related to meter installation |  |  |  |  | $ 2,900,000 |  |  |  |  |  |
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 |  |  |
Integrated Resource Plan, 2020 | PNM |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Planning period covered of IRP |  |  | 20 years |  |  |  |  |  |  |  |
NMPRC |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Action plan, covered period |  |  |  |  |  |  |  | 4 years |  |  |
NMPRC | PNM |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proposed revision to rider that will allow for recovery | $ 66,900,000 |  |  | $ 67,800,000 |  |  |  |  |  |  |
NMPRC | Renewable Energy Rider | PNM |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Renewable energy procurement plan, approved recovery, amount |  |  |  | 65,500,000 |  |  |  |  |  |  |
Recorded revenues from renewable rider |  |  |  |  |  | $ 15,500,000 | $ 15,200,000 | $ 31,400,000 | $ 30,300,000 |  |
NMPRC | Renewable Energy Rider, Sky Blue Energy Program | PNM |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proposed revision to rider that will allow for recovery |  |  |  | $ 2,300,000 |  |  |  |  |  |  |
Maximum | Renewable Portfolio Standard | PNM |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Reasonable cost threshold in megawatts per hour |  |  |  |  |  | $ 60 |  | $ 60 |  |  |
Minimum | Renewable Portfolio Standard | PNM |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Profit incentive sliding scale multiplier |  |  |  |  | 0.071 |  |  |  |  | 0.071 |
Energy efficiency and load management programs targeted energy savings (in Gigawatts) | MMBTU |  |  |  |  | 80 |  |  |  |  |  |
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 |  |  |
Disincentives and Incentives Added | 2017 Energy Efficiency and Load Management Program | PNM |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Energy efficiency and load management programs profit incentive, minimum |  |  |  |  |  |  |  |  |  | $ 1,800,000 |
Energy efficiency and load management programs targeted energy savings (in Gigawatts) | GWh |  |  |  |  |  |  |  |  |  | 59 |
Energy efficiency and load management programs additional incentive targeted energy savings (in Gigawatts) | GWh |  |  |  |  |  |  |  |  |  | 68 |
Disincentives and Incentives Added | 2020 Energy Efficiency Annual Report | PNM |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Energy efficiency and load management programs additional incentive targeted energy savings (in Gigawatts) | GWh |  | 87 |  |  |  |  |  |  |  |  |
Energy efficiency and load management programs |  | $ 800,000 |  |  |  |  |  |  |  |  |

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