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Commitments and Contingencies - The Clean Air Act (Details)
 1 Months Ended 24 Months Ended
Jul. 20, 2020
numberOfAMIMeter
Oct. 31, 2019
numberOfAMIMeter
Dec. 31, 2014
monitoringWell
Sep. 30, 2022
T
Feb. 25, 2019
parts_per_billion
Oct. 01, 2015
parts_per_billion
Sep. 30, 2015
parts_per_billion
Dec. 31, 1999
state
Public Utilities, Commitments And Contingencies [Line Items]                
Number of field work reports | numberOfAMIMeter 2 2            
Number of monitoring wells containing free-phase hydrocarbon products | monitoringWell     1          
Clean Air Act related to regional haze                
Public Utilities, Commitments And Contingencies [Line Items]                
Number of states to address regional haze (in states) | state               50
Potential to emit tons per year of visibility impairing pollution (in tons, more than) | T       250        
Maximum | PNM | San Juan Generating Station and Four Corners                
Public Utilities, Commitments And Contingencies [Line Items]                
Government standard emission limit (in ozone parts per million) | parts_per_billion         75 70 75