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Commitments and Contingencies - National Ambient Air Quality Standards (Details) - Public Service Company of New Mexico
Feb. 25, 2016
Mar. 02, 2015
lb / MMBTU
T
May 29, 2018
parts_per_billion
Oct. 01, 2015
parts_per_billion
Sep. 30, 2015
parts_per_billion
May 14, 2015
lb / MMBTU
Maximum | San Juan Generating Station And Four Corners            
Public Utilities, General Disclosures [Line Items]            
Government standard emissions limit (in parts per billion) | parts_per_billion     75 70 75  
National Ambient Air Quality Standards, 2015 EPA Legal Settlement            
Public Utilities, General Disclosures [Line Items]            
Period of time to act on settlement   16 months        
Emissions tons of SO2 per year (more than) | T   16,000        
National Ambient Air Quality Standards, 2015 EPA Legal Settlement | Minimum            
Public Utilities, General Disclosures [Line Items]            
Emissions tons of SO2 per year (more than) | T   2,600        
SO2 emissions rate (in pounds per MMBTU) | lb / MMBTU   0.45        
National Ambient Air Quality Standards | San Juan Generating Station            
Public Utilities, General Disclosures [Line Items]            
Revised SO2 emissions agreed upon (in pounds per MMBTU) | lb / MMBTU           0.10
National Ambient Air Quality Standards, Proposed 2016 SO2 Rule            
Public Utilities, General Disclosures [Line Items]            
Period of time from state designation to provide implementation plans 36 months