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Commitments and Contingencies - Coal Supply (Details) $ in Thousands |  | 1 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Feb. 17, 2022 $ / T | Dec. 31, 2020 USD ($) | Jun. 30, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Jan. 31, 2016 USD ($)
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |
Other current assets |  |  | $ 1,304 | $ 1,635 |  |  |
PNM |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |
Other current assets |  |  | 1,055 | 1,456 |  |  |
PNM | Loss on long-term purchase commitment | Surface |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |
Loss contingency accrual |  |  | 65,200 | 67,400 |  |  |
PNM | Loss on long-term purchase commitment | Underground |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |
Loss contingency accrual |  |  | 28,800 | 27,900 |  |  |
PNM | Loss on long-term purchase commitment | San Juan Generating Station | Surface |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |
Estimate of possible loss |  |  | 71,100 |  |  |  |
PNM | Loss on long-term purchase commitment | San Juan Generating Station | Underground |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |
Estimate of possible loss |  |  | 34,900 |  |  |  |
Coal supply | San Juan Generating Station |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |
Cash used to support bank letter or credit arrangement |  |  |  |  |  |  | $ 30,300
Coal supply | Four Corners |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |
Payments for relief from obligations |  |  | 75,000 |  |  |  |
Coal supply | PNM | San Juan Generating Station |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |
Other current assets |  |  | 3,300 | 20,400 |  |  |
Increase in price of coal per ton | $ / T | 5.00 |  |  |  |  |  |
Coal supply | NM Capital | San Juan Generating Station |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |
Requirement to post reclamation bonds |  |  | 118,700 |  |  |  |
Cash used to support bank letter or credit arrangement |  |  | 30,300 |  |  |  |
Increase in coal mine decommissioning liability | PNM |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |
Regulatory disallowance, additional amount recorded |  |  |  |  |  | $ 800 |
Increase in coal mine decommissioning liability | PNM | Surface |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |
Regulatory disallowance, additional amount recorded |  | $ 3,600 |  |  |  |  |
Decrease in coal mine decommissioning liability | PNM | Underground |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |
Regulatory disallowance, additional amount recorded |  | $ 100 |  |  |  |  |
Decrease in coal mine decommissioning liability | PNM | Four Corners |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |
Regulatory disallowance, additional amount recorded |  |  |  |  | $ 2,500 |  |
Mine Reclamation Trust | PNM |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |
Required contribution to reclamation trust, current fiscal year |  |  | 8,700 |  |  |  |
Reclamation trust funding, year 2 |  |  | 0 |  |  |  |
Reclamation trust funding, year 3 |  |  | 0 |  |  |  |
Four Corners CSA | PNM |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |
Other commitment, due in first year |  |  |  | 2,200 |  |  |
Other commitment, due in second year |  |  | 2,100 |  |  |  |
Other commitment, due in third year |  |  | 2,100 |  |  |  |
Other commitment, due in fourth year |  |  | 2,100 |  |  |  |
San Juan Generating Station | Loss on long-term purchase commitment | PNM |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |
Annual funding post-term reclamation trust |  |  |  | $ 5,200 |  |  |
San Juan Generating Station and Four Corners | Mine Reclamation Trust | PNM |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |
Customer reclamation funding cost |  |  | $ 100,000 |  |  |  |

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