XML 29 R28.htm IDEA: XBRL DOCUMENT v3.2.0.727
Regulation (Narrative) (Details)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
May. 20, 2015
May. 11, 2015
USD ($)
May. 01, 2015
USD ($)
Nov. 14, 2014
USD ($)
Jul. 11, 2014
USD ($)
May. 28, 2014
USD ($)
Dec. 31, 2014
USD ($)
Jun. 30, 2015
USD ($)
MW
Feb. 28, 2015
Over-collection of fuel revenues             $ 932 $ 1,512  
PUCT Docket No. 42384                  
Period Of Expected Increases In Prices For Natural Gas                 12 months
PUCT Docket No. 41852                  
Reconcilable Fuel Expense         $ 545,300        
Fuel Reconciliation Period         45 months        
Retained Percentage of Off System Sales Margins, Period Covered Start Date         Apr. 01, 2014        
Retained Percentage of Off System Sales Margins, Period Covered End Date         Jun. 30, 2015        
Fixed Fuel Factor | PUCT Docket No. 42384                  
Increase (Decrease) In Fixed Fuel Factor           $ 10,700      
Percent Increase (Decrease) In Fixed Fuel Factor           6.90%      
Fixed Fuel Factor | PUCT Docket No. 44633                  
Percent Increase (Decrease) In Fixed Fuel Factor (24.00%)                
Non-Arbitrage Sales | PUCT Docket No. 41852                  
Customers' Percentage of Off System Sales Margins         100.00%        
Arbitrage Sales | PUCT Docket No. 41852                  
Customers' Percentage of Off System Sales Margins         50.00%        
Four Corners Generating Station                  
Date participation is ceased               Jul. 06, 2016  
Number Of Power Generation Units               2  
Minimum                  
Fixed Fuel Factor Revision Period, in Months               4 months  
Maximum | PUCT Docket No. 41852                  
Retained Percentage of Off System Sales Margins         10.00%        
Four Corners Generating Station                  
Date participation is ceased               Jul. 06, 2016  
PUCT                  
Public Utilities Approved Performance Incentive Bonus Related To Energy Efficiency Program       $ 2,000     $ 2,000    
Public Utilities Requested Performance Incentive Bonus Related To Energy Efficiency Program     $ 1,000            
Fuel Over And Under Materiality Threshold Percentage               4.00%  
Over-collection of fuel revenues               $ 1,100  
PUCT | Four Corners Generating Station                  
Date of Transaction for Sale               Jul. 06, 2016  
PUCT | Montana Power Station                  
Number of power generation units authorized to be constructed               4  
Electric Capacity | MW               3  
PUCT | Fort Bliss                  
Electric Capacity | MW               20  
NMPRC | Non-Fuel Base Rate                  
Public Utilities, Requested Rate Increase (Decrease), Amount   $ 8,600              
Public Utilities, Requested Rate Increase (Decrease), Percentage   7.10%              
NMPRC | Fuel In Base Rate                  
Public Utilities, Requested Rate Increase (Decrease), Amount   $ (15,400)              
Public Utilities, Requested Rate Increase (Decrease), Percentage   (21.50%)              
NMPRC | Four Corners Generating Station                  
Date of Transaction for Sale               Jul. 06, 2016  
NMPRC | Montana Power Station                  
Number of power generation units authorized to be constructed               4  
NMPRC | Fort Bliss                  
Electric Capacity | MW               20  
NMPRC | Holloman                  
Electric Capacity | MW               5  
FERC | Four Corners Generating Station                  
Jointly Owned Utility Plant, Entire Ownership of Proportionate Interest, Percentage               100.00%