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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