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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		6 Months Ended	12 Months Ended
	Jun. 30, 2015 USD ($) MWh MW	Dec. 31, 2014 USD ($)	Jun. 30, 2015 USD ($) MW	Dec. 31, 2014 USD ($) $ / MWh	Dec. 31, 2013 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%		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%		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%		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%		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%		20.00%
Renewable Portfolio Standard [Member] | Minimum [Member] | Renewable Technologies [Member]
Public Utilities, General Disclosures [Line Items]
Public Utilities, Required Percentage of Diversification	5.00%		5.00%
Renewable Portfolio Standard [Member] | Minimum [Member] | Distributed Generation [Member]
Public Utilities, General Disclosures [Line Items]
Public Utilities, Required Percentage of Diversification	3.00%		3.00%
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 Mega Watt Hours of Wind Generation | MWh	50,000
Renewable Portfolio Standard 2014 [Member]
Public Utilities, General Disclosures [Line Items]
Public Utilities, Number of Mega Watts of Solar Photovoltaic Capacity | MW	23		23
Public Utilities, Estimated Cost of Mega Watts of Solar Photovoltaic Capacity			$ 46,700,000
Public Utilities, Wind Capacity Planned Purchase Agreement Term			20 years
Public Utilities, Number of Mega Watts of Wind Energy Capacity | 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 Mega Watt Hours of Wind Generation | MWh	120,000
Renewable Portfolio Standard 2015 [Member]
Public Utilities, General Disclosures [Line Items]
Public Utilities, Number of Mega Watts of Solar Photovoltaic Capacity | MW	40		40
Public Utilities, Estimated Cost of Mega Watts of Solar Photovoltaic Capacity			$ 79,300,000
Public Utilities, Approved Revised cost per MWh for additional necessary procurements to comply with RPS | $ / MWh				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, Rider Condition of Earned Return on Jurisdictional Equity in 2013			10.50%		10.50%
Public Utilities, Annual Revenue To be Collected Under 2015 Rider Rate	$ 44,700,000		$ 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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