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Commitments and Contingencies - National Ambient Air Quality Standards (Details) - Public Service Company of New Mexico [Member]
Mar. 02, 2015
lb / MMBTU
T
Jun. 30, 2015
opp
Nov. 25, 2014
opp
Nov. 08, 2013
lb / MMBTU
Jan. 31, 2010
opp
National Ambient Air Quality Standards, 2015 EPA Legal Settlement [Member]          
Public Utilities, Commitments And Contingencies [Line Items]          
Period of time to act on settlement 16 months        
Public Utilities, Emissions Tons of SO2 per year | T 16,000        
San Juan Generating Station [Member] | National Ambient Air Quality Standards [Member]          
Public Utilities, Commitments And Contingencies [Line Items]          
Public Utilities, Revised SO2 Emissions Agreed Upon | lb / MMBTU       0.10  
Minimum [Member] | National Ambient Air Quality Standards, 2015 EPA Legal Settlement [Member]          
Public Utilities, Commitments And Contingencies [Line Items]          
Public Utilities, Emissions Tons of SO2 per year | T 2,600        
Public Utilities, 1-hour SO2 Emissions Rate | lb / MMBTU 0.45        
Minimum [Member] | San Juan Generating Station And Four Corners [Member]          
Public Utilities, Commitments And Contingencies [Line Items]          
Public Utilities, Proposed Government Standard Emission Limit     65   60
Maximum [Member] | San Juan Generating Station And Four Corners [Member]          
Public Utilities, Commitments And Contingencies [Line Items]          
Public Utilities, Proposed Government Standard Emission Limit     70   70
Public Utilities, Government Standard Emission Limit   75