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Regulatory and Rate Matters - TNMP Narrative (Details) - Texas-New Mexico Power Company [Member]
 1 Months Ended
Jul. 30, 2011
USD ($)
Jul. 24, 2015
customer
Jun. 30, 2015
USD ($)
customer
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 | customer     1,081
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 | customer   96  
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     5,900,000
Public Utilities, Unapproved 2016 Program Implementation Costs, Bonus     $ 600,000