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Regulatory and Rate Matters - Energy Efficiency and Load Management (Details) - Public Service Company of New Mexico [Member] - USD ($) $ in Millions		6 Months Ended
	Oct. 06, 2014	Jun. 30, 2015	Dec. 31, 2014
Energy Efficiency and Load Management [Member] | Disincentives / Incentives Adder [Member]
Public Utilities, General Disclosures [Line Items]
Public Utilities, Program Costs Related To Energy Efficiency	$ 25.8
Public Utilities, Approved Profit Incentive Adder Revenues Related To Energy Efficiency Program, Percentage of Program Costs		7.60%
Public Utilities, Approved Profit Incentive Adder Revenues Related To Energy Efficiency Program		$ 1.7
Public Utilities, Proposed Profit Incentive Adder Revenues Related To 2015 Energy Efficiency Program	$ 2.1
2014 Energy Efficiency and Load Management Program [Member] | Disincentives / Incentives Adder [Member]
Public Utilities, General Disclosures [Line Items]
Public Utilities, Anticipated future profit incentive 2015			$ 1.7
Public Utilities, Anticipated future profit incentive 2016			$ 1.8
Maximum [Member] | Renewable Portfolio Standard [Member]
Public Utilities, General Disclosures [Line Items]
Public Utilities, Reasonable Cost Threshold		3.00%

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