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Regulatory and Rate Matters - Four Corners Abandonment Application (Details) - Public Service Company of New Mexico
$ in Millions
 1 Months Ended
Jan. 08, 2021
USD ($)
Nov. 01, 2020
USD ($)
Nov. 30, 2020
USD ($)
Jan. 28, 2021
MW
Jul. 29, 2020
MW
Public Utilities, General Disclosures [Line Items]          
Solar distributed generation (in mw) | MW         650
Four Corners          
Public Utilities, General Disclosures [Line Items]          
Payments for relief from obligations   $ 75.0 $ 15.0    
Final payment for relief from obligations     60.0    
Initial payment for relief from obligations     $ 15.0    
Request issuance of energy transition bonds $ 300.0        
Forecasted undepreciated investment 272.0        
Plant decommissioning and coal mine reclamation costs 4.6        
Upfront financing costs 7.3        
Proceeds from securitization bonds $ 16.5        
Solar distributed generation (in mw) | MW       200  
Four Corners | Public Service Company of New Mexico          
Public Utilities, General Disclosures [Line Items]          
Noncontrolling interest, ownership percentage by noncontrolling owners   13.00%