XML 72 R47.htm IDEA: XBRL DOCUMENT v2.4.0.8
Commitments and Contingencies (Commitments and Contingencies Related to the Environment) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended 12 Months Ended 9 Months Ended
Dec. 21, 2011
mw
Dec. 21, 2011
San Juan Generating Station [Member]
Oct. 31, 2012
San Juan Generating Station [Member]
Public Service Company of New Mexico [Member]
Sep. 30, 2013
San Juan Generating Station Units 2 and 3 [Member]
PNM Electric [Member]
Nov. 08, 2010
Four Corners [Member]
Sep. 30, 2013
Clean Air Act related to Regional Haze [Member]
state
Sep. 30, 2013
Clean Air Act Related to Post Combustion Controls [Member]
Four Corners [Member]
Public Service Company of New Mexico [Member]
Aug. 06, 2012
Clean Air Act Related to Post Combustion Controls [Member]
Four Corners [Member]
Public Service Company of New Mexico [Member]
compliance_alternative
Sep. 30, 2012
Mercury Control [Member]
San Juan Generating Station [Member]
Public Service Company of New Mexico [Member]
Sep. 30, 2013
Minimum [Member]
San Juan Generating Station Units 1 and 4 [Member]
Public Service Company of New Mexico [Member]
Jan. 31, 2010
Minimum [Member]
San Juan Generating Station And Four Corners [Member]
Public Service Company of New Mexico [Member]
opp
Sep. 30, 2013
Maximum [Member]
San Juan Generating Station Units 1 and 4 [Member]
Public Service Company of New Mexico [Member]
Jan. 31, 2010
Maximum [Member]
San Juan Generating Station And Four Corners [Member]
Public Service Company of New Mexico [Member]
opp
Sep. 30, 2012
Maximum [Member]
Mercury Control [Member]
San Juan Generating Station [Member]
Public Service Company of New Mexico [Member]
Oct. 31, 2012
Installation Costs Including Construction Management, Gross Receipts Taxes, AFUDC, and Other PNM Costs [Member]
Minimum [Member]
Clean Air Act, SNCR [Member]
San Juan Generating Station [Member]
Public Service Company of New Mexico [Member]
Sep. 30, 2013
Installation Costs Including Construction Management, Gross Receipts Taxes, AFUDC, and Other PNM Costs [Member]
Minimum [Member]
Clean Air Act, SNCR [Member]
San Juan Generating Station Units 1 and 4 [Member]
Public Service Company of New Mexico [Member]
Oct. 31, 2012
Installation Costs Including Construction Management, Gross Receipts Taxes, AFUDC, and Other PNM Costs [Member]
Maximum [Member]
Clean Air Act, SNCR [Member]
San Juan Generating Station [Member]
Public Service Company of New Mexico [Member]
Sep. 30, 2013
Installation Costs Including Construction Management, Gross Receipts Taxes, AFUDC, and Other PNM Costs [Member]
Maximum [Member]
Clean Air Act, SNCR [Member]
San Juan Generating Station Units 1 and 4 [Member]
Public Service Company of New Mexico [Member]
Sep. 30, 2013
Environmental Protection Agency [Member]
WildEarth Guardians filed an action to challenge EPA's rule in the Tenth Circuit [Member]
San Juan Generating Station [Member]
Sep. 30, 2013
Environmental Protection Agency [Member]
Clean Air Act Related to Post Combustion Controls [Member]
Four Corners [Member]
Public Service Company of New Mexico [Member]
Sep. 30, 2013
Nuclear Spent Fuel And Waste Disposal [Member]
Palo Verde Nuclear Generating Station [Member]
Public Service Company of New Mexico [Member]
Sep. 30, 2013
Nuclear Spent Fuel And Waste Disposal [Member]
Other Deferred Credits [Member]
Palo Verde Nuclear Generating Station [Member]
Public Service Company of New Mexico [Member]
Dec. 31, 2012
Nuclear Spent Fuel And Waste Disposal [Member]
Other Deferred Credits [Member]
Palo Verde Nuclear Generating Station [Member]
Public Service Company of New Mexico [Member]
Public Utilities, Commitments and Contingencies [Line Items]                                              
Loss Contingency, Estimate of Possible Loss             $ 75.0                           $ 42.8    
Public Utilities, Number of Compliance alternatives               2                              
Public Utilities, Plant Requirement to Meet NOx emissions Limit             0.015                                
Public Utilities, Number of States To Address Regional Haze           50                                  
Public Utilities, Potential to emit tons per year of visibility impairing pollution, maximum           250                                  
Estimated Total Capital Cost If Requirement Occurred                             824   910            
Estimated Installation Capital Costs                             85.0 60.0 90.0 80.0          
Estimated Portion of Total Capital Costs if Requirement Occurred                             105   110            
Jointly Owned Utility Plant, Proportionate Ownership Share     46.30%             52.00%   55.00%                      
estimated cost of replacing gas fired peaking capacity due to retirement of SJGS units       299                                      
Net book value       287                                      
Public Utilities, Government Standard Emission Limit                     0.060   0.070                    
Public Utilities, Plant Requirement to Meet Opacity Limit, Percentage             20.00%                                
Public Utilities, Rule Imposes Opacity Limitation on Certain Fugitive Dust Emissions From Coal and Material Handling Operations             20.00%                                
Current Annual Mercury Control Costs                 0.6                            
Contingent Estimated Annual Mercury Control Cost                           6.1                  
Minimum Megawatt Capacity from Coal and Oil-Fired Electric Generating Units under Jurisdiction of the Mercury and Air Toxics Standards 25                                            
Mercury Removal Rate, Percentage   99.00%                                          
Public Utilities, Proposed Seeking Shorter Compliance Period                                     5 years        
Public Utilities, Number of years after issuance of final determination to achieve compliance with requirements                                       3 years      
Loss Contingency Accrual, at Carrying Value                                           $ 12.4 $ 13.9
Public Utilities, Jointly Owned Utility Plant, Sale of Ownership Percentage         48.00%