Public Utilities, Number of Mega Watts of Solar Photovoltaic Capacity

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Public Utilities, Number of Mega Watts of Solar Photovoltaic Capacity, Current Output

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Public Utilities, Number of Mega Watts of Wind Energy Capacity

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Reasonable Cost Threshold

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Regulated Operations, Required Percentage of Diversification

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Public Utilities, Solar generation capacity in Megawatts

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Public Utilities, Wind Capacity Planned Purchase Agreement Term

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Regulatory and Rate Matters - Renewable Portfolio Standard (Details) - Public Service Company of New Mexico [Member] - MW	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Renewable Portfolio Standard [Member]
Public Utilities, General Disclosures [Line Items]
Solar photovoltaic capacity (in mw)	107	40	23
Current output of solar photovoltaic capacity (in mw)			4
Solar distributed generation (in mw)	62.7
Renewable Portfolio Standard [Member] \| Minimum [Member]
Public Utilities, General Disclosures [Line Items]
Reasonable cost threshold	3.00%
Renewable Portfolio Standard [Member] \| Minimum [Member] \| Wind [Member]
Public Utilities, General Disclosures [Line Items]
Required percentage of diversification	30.00%
Renewable Portfolio Standard [Member] \| Minimum [Member] \| Solar [Member]
Public Utilities, General Disclosures [Line Items]
Required percentage of diversification	20.00%
Renewable Portfolio Standard [Member] \| Minimum [Member] \| Distributed Generation [Member]
Public Utilities, General Disclosures [Line Items]
Required percentage of diversification	3.00%
Renewable Portfolio Standard [Member] \| Minimum [Member] \| Other [Member]
Public Utilities, General Disclosures [Line Items]
Required percentage of diversification	5.00%
Renewable Portfolio Standard [Member] \| Required Percentage by 2011 [Member]
Public Utilities, General Disclosures [Line Items]
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]
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]
Required percentage of renewable energy in portfolio to electric sales	20.00%
Renewable Portfolio Standard Supplemental Procurement [Member]
Public Utilities, General Disclosures [Line Items]
Solar photovoltaic capacity (in mw)				1.5
Renewable Portfolio Standard 2014 [Member]
Public Utilities, General Disclosures [Line Items]
Wind energy capacity (in mw)	204	102
Wind capacity, planned purchase agreement, term		20 years