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Financing - Financing Activities (Details) - USD ($) $ in Thousands		12 Months Ended
	May. 08, 2015	Dec. 31, 2014	Jun. 30, 2015	Jun. 01, 2015	Mar. 09, 2015	Dec. 22, 2014	Mar. 05, 2014	Apr. 22, 2013
Debt Instrument [Line Items]
Short-term debt		$ 105,600	$ 187,600
PNMR 2015 Term Loan Agreement [Member]
Debt Instrument [Line Items]
Long-term Debt					$ 150,000
Debt Instrument, Interest Rate at Period End			1.19%
Public Service Company of New Mexico [Member] | PNM 2014 Term Loan Agreement [Member]
Debt Instrument [Line Items]
Long-term Debt							$ 175,000
Debt Instrument, Interest Rate at Period End			1.14%
Public Service Company of New Mexico [Member] | PNM 2014 Multi-Draw Term Loan Agreement [Member]
Debt Instrument [Line Items]
Long-term Debt			$ 125,000			$ 125,000
Debt Instrument, Interest Rate at Period End			0.77%
Proceeds from (Repayments of) Debt	$ 25,000	100,000
PNM Term Loan Agreement [Member] | Notes Payable to Banks [Member]
Debt Instrument [Line Items]
Short-term debt								$ 75,000
Senior unsecured note, due 2015, at 9 point 25 percent [Member] | Unsecured Debt [Member]
Debt Instrument [Line Items]
Unsecured Long-term Debt, Noncurrent		$ 118,800
Debt Instrument, Interest Rate, Stated Percentage		9.25%
Senior unsecured note, PCRB Due 2043, at 4 percent [Member] | Public Service Company of New Mexico [Member] | Unsecured notes, Pollution control revenue bonds [Member]
Debt Instrument [Line Items]
Unsecured Long-term Debt, Noncurrent		$ 39,300
Debt Instrument, Interest Rate, Stated Percentage				2.40%
Senior unsecured note, PCRB Due 2043, at 2 point 4 percent [Member] | Public Service Company of New Mexico [Member] | Unsecured notes, Pollution control revenue bonds [Member]
Debt Instrument [Line Items]
Unsecured Long-term Debt, Noncurrent				$ 39,300

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