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Regulatory and Rate Matters - Renewable Portfolio Standard and Energy Rider (Details) - Public Service Company of New Mexico [Member]		3 Months Ended		9 Months Ended	12 Months Ended
	Jul. 01, 2013 USD ($) MWh MW	Jun. 30, 2015 USD ($)	Dec. 31, 2014 USD ($)	Sep. 30, 2015 USD ($) MW	Dec. 31, 2014 USD ($) $ / MWh	Dec. 31, 2013 $ / MWh	Apr. 27, 2015 USD ($)	Feb. 27, 2015 USD ($)
Renewable Portfolio Standard [Member] | Required Percentage by 2011 [Member]
Public Utilities, General Disclosures [Line Items]
Public utilities, required percentage of renewable energy in portfolio to electric sales				10.00%
Renewable Portfolio Standard [Member] | Required Percentage by 2015 [Member]
Public Utilities, General Disclosures [Line Items]
Public utilities, required percentage of renewable energy in portfolio to electric sales				15.00%
Renewable Portfolio Standard [Member] | Required Percentage by 2020 [Member]
Public Utilities, General Disclosures [Line Items]
Public utilities, required percentage of renewable energy in portfolio to electric sales				20.00%
Renewable Portfolio Standard [Member] | Minimum [Member] | Wind Energy [Member]
Public Utilities, General Disclosures [Line Items]
Public utilities, required percentage of diversification				30.00%
Renewable Portfolio Standard [Member] | Minimum [Member] | Solar Energy [Member]
Public Utilities, General Disclosures [Line Items]
Public utilities, required percentage of diversification				20.00%
Renewable Portfolio Standard [Member] | Minimum [Member] | Distributed Generation [Member]
Public Utilities, General Disclosures [Line Items]
Public utilities, required percentage of diversification				3.00%
Renewable Portfolio Standard [Member] | Minimum [Member] | Renewable Technologies [Member]
Public Utilities, General Disclosures [Line Items]
Public utilities, required percentage of diversification				5.00%
Renewable Portfolio Standard [Member] | Maximum [Member]
Public Utilities, General Disclosures [Line Items]
Public utilities, reasonable cost threshold				3.00%		3.00%
2014 Wind generated Renewable Energy Credits [Member]
Public Utilities, General Disclosures [Line Items]
Public utilities, number of megawatt hours of wind generation (megawatt hours) | MWh	50,000
Renewable Portfolio Standard 2014 [Member]
Public Utilities, General Disclosures [Line Items]
Public utilities, number of megawatts of solar photovoltaic capacity (in megawatts) | MW	23
Public utilities, estimated cost of megawatts of solar photovoltaic capacity	$ 46,700,000
Public utilities, wind capacity planned purchase agreement term	20 years
Public utilities, number of megawatts of wind energy capacity (in megawatts) | MW	102
Public utilities, first-year cost of wind capacity, planned purchase agreement	$ 5,800,000.0
Public utilities, final cost of solar photovoltaic capacity					$ 46,500,000
Public Utilities, Cost of renewable resources procured		$ 100,000	$ 100,000
2015 Wind generated Renewable Energy Credits [Member]
Public Utilities, General Disclosures [Line Items]
Public utilities, number of megawatt hours of wind generation (megawatt hours) | MWh	120,000
Renewable Portfolio Standard 2015 [Member]
Public Utilities, General Disclosures [Line Items]
Public utilities, number of megawatts of solar photovoltaic capacity (in megawatts) | MW				40
Public utilities, estimated cost of megawatts of solar photovoltaic capacity				$ 78,000,000
Public Utilities, Approved Revised cost per MWh for additional necessary procurements to comply with RPS | $ / MWh					3.00	3.00
Renewable Energy Rider [Member]
Public Utilities, General Disclosures [Line Items]
Public utilities, revenue from renewable energy rider					$ 34,300,000
Renewable Energy Rider [Member] | Maximum [Member]
Public Utilities, General Disclosures [Line Items]
Public Utilities, Approved Return on Equity, Percentage				10.50%
Public utilities, rider condition of earned return on jurisdictional equity in 2013						10.50%
Public utilities, annual revenue to be collected under 2015 rider rate				$ 44,700,000
Public utilities, revised annual revenue to be collected under 2015 rider rate								$ 43,000,000
Public utilities, annual revenue to be collected under 2016 rider rate							$ 42,400,000

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