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Financing, Short-term Debt (Details) (USD $)	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2014 Line of Credit [Member]	Dec. 31, 2013 Line of Credit [Member]	Mar. 31, 2014 PNM Resources [Member] Revolving Credit Facility [Member]	Dec. 31, 2013 PNM Resources [Member] Revolving Credit Facility [Member]	Mar. 31, 2014 Public Service Company of New Mexico [Member]	Dec. 31, 2013 Public Service Company of New Mexico [Member]	Mar. 31, 2014 Public Service Company of New Mexico [Member] Revolving Credit Facility [Member]	Dec. 31, 2013 Public Service Company of New Mexico [Member] Revolving Credit Facility [Member]	Mar. 31, 2014 Texas-New Mexico Power Company [Member]	Dec. 31, 2013 Texas-New Mexico Power Company [Member]	Mar. 31, 2014 Texas-New Mexico Power Company [Member] Revolving Credit Facility [Member]	Dec. 31, 2013 Texas-New Mexico Power Company [Member] Revolving Credit Facility [Member]	Apr. 25, 2014 Available Borrowing Capacity [Member]	Apr. 25, 2014 Available Borrowing Capacity [Member] PNM Resources [Member]	Apr. 25, 2014 Available Borrowing Capacity [Member] Public Service Company of New Mexico [Member]	Apr. 25, 2014 Available Borrowing Capacity [Member] Texas-New Mexico Power Company [Member]	Apr. 25, 2014 Subsequent Event [Member] PNM Resources [Member]	Apr. 25, 2014 Subsequent Event [Member] Public Service Company of New Mexico [Member]	Apr. 25, 2014 Subsequent Event [Member] Texas-New Mexico Power Company [Member]	Apr. 25, 2014 Affiliated Entity [Member] Intercompany loan agreements [Member] Texas-New Mexico Power Company [Member]	Mar. 31, 2014 PNMR Term Loan Agreement [Member]	Dec. 31, 2013 PNMR Term Loan Agreement [Member]	Mar. 31, 2014 First Mortgage Bonds Due 2014, Series 2009A, at 9 point 50 percent [Member] Texas-New Mexico Power Company [Member] Revolving Credit Facility [Member]	Mar. 31, 2014 Local Lines of Credit [Member] Public Service Company of New Mexico [Member]	Mar. 31, 2013 Local Lines of Credit [Member] Public Service Company of New Mexico [Member]	Apr. 22, 2013 PNM Term Loan Agreement [Member] Notes Payable to Banks [Member]	Mar. 31, 2014 PNM 2014 Term Loan Agreement [Member] Public Service Company of New Mexico [Member]
Short-term Debt [Line Items]
Line of Credit Facility, Remaining Borrowing Capacity															$ 806,900,000	$ 291,400,000	$ 396,800,000	$ 68,700,000								$ 50,000,000
Line of Credit Facility, Maximum Borrowing Capacity					300,000,000.0				400,000,000.0				75,000,000.0
Debt Instrument, Collateral Amount																									75,000,000
Short-term Debt, Weighted Average Interest Rate	1.01%
Short-term debt	100,000,000	149,200,000	100,000,000	149,200,000	0	0	0	49,200,000	0	49,200,000			0	0									100,000,000	100,000,000		0	0	75,000,000
Short-term debt – affiliate											31,200,000	29,400,000										41,200,000
Restricted Cash and Investments																			$ 2,000,000	$ 9,300,000	$ 0
Debt Instrument, Interest Rate at Period End																													1.11%

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Short Term Debt Due to Related Party

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Amount of assets pledged to secure a debt instrument.

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The effective interest rate at the end of the reporting period.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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Weighted average interest rate of short-term debt outstanding.

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