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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 |  |  |

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