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Regulatory and Rate Matters - Summer Peak Resource Adequacy (Details) - PNM - MW
 1 Months Ended 3 Months Ended 12 Months Ended
Oct. 25, 2023
Apr. 17, 2023
Jan. 30, 2023
Jun. 30, 2022
Dec. 31, 2023
Dec. 31, 2023
Dec. 31, 2021
Solar Agreement              
Public Utilities, General Disclosures [Line Items]              
Number of megawatts available in purchase power agreement (in megawatts) 100   100        
Battery Storage Agreement              
Public Utilities, General Disclosures [Line Items]              
Number of megawatts available in purchase power agreement (in megawatts)     30        
Portfolio One              
Public Utilities, General Disclosures [Line Items]              
Number of megawatts available in purchase power agreement (in megawatts)   420   85     85
Portfolio Two              
Public Utilities, General Disclosures [Line Items]              
Number of megawatts available in purchase power agreement (in megawatts)         40 375 40