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Regulatory and Rate Matters - TNMP Narrative (Details) - Texas-New Mexico Power Company [Member]
 1 Months Ended 9 Months Ended
Jul. 30, 2011
USD ($)
Sep. 30, 2015
USD ($)
Oct. 23, 2015
customer
Oct. 02, 2015
USD ($)
May. 29, 2015
USD ($)
Sep. 11, 2014
USD ($)
Jun. 20, 2014
USD ($)
customer
Oct. 25, 2013
USD ($)
Advanced Meter System Deployment and Surcharge Request [Member]                
Public Utilities, General Disclosures [Line Items]                
Public utilities, approved deployment costs $ 113,400,000              
Public utilities, collection of deployment costs through surcharge period 12 years              
Public utilities, completion period of advanced meter deployment 5 years              
Public utilities, non-standard metering service cost, total to be borne by opt-out customers             $ 200,000  
Public utilities, non-standard metering, ongoing expenses, total to be borne by opt-out customers             500,000  
Public utilities, approved non-standard metering ongoing expenses monthly charge             $ 36.78  
Presumed number of customers that will elect non-standard meter service (customers) | customer             1,081  
Public Utilities, Program costs incurred to date   $ 1,500,000            
Advanced Meter System Deployment and Surcharge Request [Member] | Subsequent Event [Member]                
Public Utilities, General Disclosures [Line Items]                
Current number of customers that have elected non-standard meter service (customers) | customer     94          
Public Utilities, Cost and savings reconciliation filed with regulators, captial cost savings       $ 71,000,000        
Public Utilities, Cost and savings reconciliation filed with regulators, operations and maintenance savings       $ 18,000,000        
Advanced Meter System Deployment and Surcharge Request [Member] | Minimum [Member]                
Public Utilities, General Disclosures [Line Items]                
Public utilities, approved non-standard metering service cost, initial fee range             $ 63.97  
Advanced Meter System Deployment and Surcharge Request [Member] | Maximum [Member]                
Public Utilities, General Disclosures [Line Items]                
Public utilities, approved non-standard metering service cost, initial fee range             $ 168.61  
Energy Efficiency [Member]                
Public Utilities, General Disclosures [Line Items]                
Public utilities, approved 2014 program implementation costs               $ 5,600,000
Public utilities, unapproved 2015 program implementation costs, bonus               $ 700,000
Public utilities, unapproved 2015 program implementation costs           $ 5,700,000    
Public utilities, approved 2014 incentive portion of program implementation costs           $ 1,500,000    
Public utilities, requested 2016 program implementation costs         $ 6,000,000      
Public utilities, unapproved 2016 program implementation costs, bonus         $ 700,000