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Regulatory and Rate Matters - PNM (Details) $ in Thousands |  |  |  |  |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 14, 2024 USD ($) | Jun. 03, 2024 USD ($) | Jan. 03, 2024 USD ($) | Jan. 01, 2024 USD ($) | Apr. 17, 2023 USD ($) program | Dec. 05, 2022 USD ($) lease MW | Sep. 30, 2024 USD ($) MW | Sep. 30, 2023 USD ($) | Sep. 30, 2024 USD ($) MW | Sep. 30, 2023 USD ($) | 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
Electric operating revenues |  |  |  |  |  |  | $ 569,256 | $ 505,851 | $ 1,494,235 | $ 1,527,084 |
Excess return on jurisdictional equity that would require refund |  |  |  |  |  |  | 0.50% |  | 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 |  |  |  |  |  |  |  |
NMPRC |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Requested return on equity |  |  |  |  |  | 10.25% |  |  |  |  |
Action plan, covered period |  |  |  |  |  |  |  |  | 3 years |  |
2025 Rate Request |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Requested return on equity | 10.45% |  |  |  |  |  |  |  |  |  |
Requested equity capital structure | 52.50% |  |  |  |  |  |  |  |  |  |
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] |  |  |  |  |  |  |  |  |  |  |
Electric operating revenues |  |  |  |  |  |  |  |  |  |  | (38,400)
2024 Rate Change | Four Corners |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Regulatory disallowances |  |  |  |  |  |  |  |  |  |  | 55,500
2024 Rate Change | Palo Verde Nuclear Generating Station |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Regulatory disallowances |  |  |  |  |  |  |  |  |  |  | $ 8,200
NM 2022 Rate Case |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Requested return on equity |  |  | 9.26% |  |  |  |  |  |  |  |
Requested equity capital structure |  |  | 49.61% |  |  |  |  |  |  |  |
Requested debt capital structure |  |  | 50.10% |  |  |  |  |  |  |  |
Requested equity capital structure, percentage |  |  | 0.29% |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |
PNM |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of leases renewed | lease |  |  |  |  |  | 5 |  |  |  |  |
Number of megawatts purchased (in megawatts) | MW |  |  |  |  |  | 64.1 |  |  |  |  |
Electric operating revenues |  |  |  |  |  |  | $ 406,519 | 350,334 | $ 1,048,305 | 1,118,741 |
PNM | NMPRC |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proposed revision to rider that will allow for recovery |  | $ 58,700 |  | $ 59,000 |  |  |  |  |  |  |
PNM | 2025 Rate Request |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Recovery of base rate | $ 3,000,000 |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) | 174,300 |  |  |  |  |  |  |  |  |  |
Increase in base rate | 92,200 |  |  |  |  |  |  |  |  |  |
Increase in revenues from FPPAC | $ 82,100 |  |  |  |  |  |  |  |  |  |
PNM | 2024 Rate Change |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Recovery of base rate |  |  |  |  |  | $ 2,700,000 |  |  |  |  |
PNM | 2024 Rate Change | Non-Fuel Energy |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) |  |  |  |  |  | $ 63,800 |  |  |  |  |
PNM | Renewable Portfolio Standard |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  | 302.4 |  | 302.4 |  |
PNM | Renewable Portfolio Standard | La Joya Wind |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of megawatts for wind energy | MW |  |  |  |  |  |  |  |  | 140 |  |
PNM | Renewable Portfolio Standard 2014 | New Mexico Wind |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of megawatts for wind energy | MW |  |  |  |  |  |  |  |  | 200 |  |
PNM | Renewable Portfolio Standard 2014 | Red Mesa Wind |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of megawatts for wind energy | MW |  |  |  |  |  |  |  |  | 102 |  |
PNM | Renewable Energy Rider | NMPRC |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Recorded revenues from renewable rider |  |  |  |  |  |  | $ 11,100 | 13,000 | $ 41,700 | 47,000 |
PNM | 2024 Plan |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |
PNM | Energy Efficiency and Load Management Program | Minimum |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Profit incentive sliding scale multiplier |  |  |  |  | 0.071 |  |  |  |  |  |
PNM | Energy Efficiency and Load Management Program | Maximum |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Profit incentive sliding scale multiplier |  |  |  |  | 0.0882 |  |  |  |  |  |
PNM | Integrated Resource Plan, 2011 |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Frequency of IRP filings |  |  |  |  |  |  |  |  | 3 years |  |
Planning period covered of IRP |  |  |  |  |  |  |  |  | 20 years |  |
TXNM and PNM | New Mexico Public Regulation Commission | San Juan Generating Station |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Regulatory disallowances |  |  |  |  |  |  |  |  |  | 2,300 |
Electric operating revenues |  |  |  |  |  |  |  |  |  | (115,000) |
Regulatory asset, reversal |  |  |  |  |  |  |  | $ 2,300 |  | $ 2,300 |

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