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Regulatory and Rate Matters - PNM Solar Direct, Application for a New 345-kV Transmission Line and Wester Spirit Line (Details)
$ in Millions
May 31, 2019
MW
Dec. 31, 2021
USD ($)
May 01, 2019
kv
PNM Solar Direct      
Public Utilities, General Disclosures [Line Items]      
Solar distributed generation (in mw) | MW 50    
PPA term 15 years    
Western Spirit Line      
Public Utilities, General Disclosures [Line Items]      
Transmission line and associated facilities (kV) | kv     345
Western Spirit And Pattern Wind Affiliattes      
Public Utilities, General Disclosures [Line Items]      
Estimated cost of project   $ 360  
Estimated self-fund amount under agreement   $ 75