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Regulatory and Rate Matters - Electric Rate Case (Details) - 2014 Electric Rate Case [Member] - Public Service Company of New Mexico [Member] $ in Millions |  | 6 Months Ended |
--- | --- | --- | ---
May. 27, 2015 | Jun. 30, 2015 USD ($) | Jun. 25, 2015
Public Utilities, General Disclosures [Line Items] |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amount |  | $ 107.4 |
Public Utilities, Requested Return on Equity, Percentage |  | 10.50% |
Public Utilities, Average customer bill increase percentage |  | 7.69% |
Public Utilities, Percentage of requested rate increase pertaining to infrastructure investments |  | 92.00% |
Future test year period, Number of days following the filing of application for rate increase | 45 days | 13 months |
Public Utilities, Number of other utilities filing appeals |  |  | 2
Public Utilities, Number of other parties filing cross appeals |  |  | 1

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