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Regulatory and Rate Matters - SJGS Abandonment Application (Details) $ in Thousands |  |  |  |  |  |  |  | 3 Months Ended | 12 Months Ended |  |
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Dec. 15, 2023 USD ($) | Sep. 21, 2023 USD ($) | Aug. 18, 2023 USD ($) | Jul. 29, 2022 USD ($) | Jun. 17, 2022 USD ($) | Jul. 10, 2019 proceeding | Jul. 01, 2019 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Nov. 15, 2023 USD ($) | Feb. 21, 2020 USD ($)
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenues |  |  |  |  |  |  |  |  | $ 1,939,198 | $ 2,249,555 | $ 1,779,873 |  |
PNM |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  |  |  | $ 911,723 | 911,723 | 782,274 |  |  |
Payments for legal settlements |  |  |  | $ 19,800 |  |  |  |  |  |  |  |  |
Proposed rate credits |  |  | $ 115,000 |  |  |  |  |  |  |  |  |  |
Rate credit period |  |  | 1 year |  |  |  |  |  |  |  |  |  |
Securitization bonds, weighted-average maximum rate |  |  | 5.50% |  |  |  |  |  |  |  |  |  |
Rate credits | $ 13,700 |  |  |  |  |  |  |  |  |  |  |  |
Regulatory liabilities |  |  |  |  |  |  |  | 699,867 | 699,867 | 564,902 |  |  |
Operating Revenues |  |  |  |  |  |  |  |  | 1,403,948 | 1,766,825 | $ 1,362,020 |  |
PNM | Securitized Bonds | Senior Secured Notes, Energy Transition Bonds |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  |  |  |  |  | $ 343,200 |
Debt, Weighted Average Interest Rate |  |  |  |  |  |  |  |  |  |  |  | 5.50% |
PNM | Securitized Bonds, 5.64% | Senior Secured Notes, Energy Transition Bonds |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  |  |  |  |  | $ 175,000 |
Stated percentage |  |  |  |  |  |  |  |  |  |  |  | 5.64% |
PNMR and PNM | New Mexico Public Regulation Commission |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory liabilities |  | $ 128,700 |  |  |  |  |  |  |  |  |  |  |
Operating Revenues |  | $ (128,700) |  |  |  |  |  |  |  |  |  |  |
Regulatory disallowance |  |  |  |  |  |  |  | 3,300 |  |  |  |  |
Regulatory asset, reversal |  |  |  |  |  |  |  | 3,300 | 3,300 |  |  |  |
San Juan Generating Station | PNM |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Request issuance of energy transition bonds |  |  |  |  |  |  | $ 361,000 |  |  |  |  |  |
Forecasted undepreciated investment |  |  |  |  |  |  |  | 283,000 | 283,000 |  |  |  | $ 361,000
Plant decommissioning and coal mine reclamation costs |  |  |  |  |  |  |  | 28,600 | 28,600 |  |  |  |
Upfront financing costs |  |  |  |  |  |  |  | $ 9,600 | 9,600 |  |  |  |
Severance costs |  |  |  |  |  |  |  |  | $ 20,000 |  |  |  |
Proceeds from securitization bonds |  |  |  |  |  |  | $ 19,800 |  |  |  |  |  |
Regulatory assets |  |  |  |  |  |  |  |  |  | $ 37,200 |  |  |
Number of proceedings | proceeding |  |  |  |  |  | 2 |  |  |  |  |  |  |
San Juan Generation Station, Unit 1 | PNM |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Annual rate credits |  |  |  |  | $ 21,100 |  |  |  |  |  |  |  |
San Juan Generating Station, Unit 4 | PNM |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Annual rate credits |  |  |  |  | $ 98,300 |  |  |  |  |  |  |  |
Number of days to transfer payment |  |  |  |  | 30 days |  |  |  |  |  |  |  |

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