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Regulatory and Rate Matters - Energy Efficiency and Load Management (Details) - Public Service Company of New Mexico [Member] - USD ($) $ in Millions		1 Months Ended	12 Months Ended
	Oct. 06, 2014	Nov. 30, 2013	Dec. 31, 2014	Sep. 30, 2015	Jan. 30, 2015	Dec. 31, 2013
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%		3.00%

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