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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

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