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Financing, Financing Activities (Details) (USD $)	9 Months Ended					9 Months Ended						0 Months Ended						9 Months Ended		0 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012	Sep. 30, 2013 Public Service Company of New Mexico [Member]	Dec. 31, 2012 Public Service Company of New Mexico [Member]	Sep. 30, 2013 Texas-New Mexico Power Company [Member]	Sep. 30, 2012 Texas-New Mexico Power Company [Member]	Mar. 06, 2013 Texas-New Mexico Power Company [Member]	Dec. 31, 2012 Texas-New Mexico Power Company [Member]	Sep. 30, 2013 PNMR Term Loan Agreement [Member]	Dec. 31, 2012 PNMR Term Loan Agreement [Member]	Apr. 03, 2013 First Mortgage Bonds [Member] Texas-New Mexico Power Company [Member]	Apr. 03, 2013 First Mortgage Bonds [Member] First Mortgage Bonds Due 2014, Series 2009A, at 9 point 50 percent [Member] Texas-New Mexico Power Company [Member]	Mar. 06, 2013 First Mortgage Bonds [Member] First Mortgage Bonds Due 2014, Series 2009A, at 9 point 50 percent [Member] Texas-New Mexico Power Company [Member]	Apr. 03, 2013 First Mortgage Bonds [Member] First Mortgage Bonds, due 2043, Series 2013A [Member] Texas-New Mexico Power Company [Member]	Mar. 06, 2013 First Mortgage Bonds [Member] First Mortgage Bonds, due 2043, Series 2013A [Member] Texas-New Mexico Power Company [Member]	Sep. 30, 2013 Senior Unsecured Note, Due 2015, at 9 point 25 percent [Member]	Sep. 30, 2013 Senior Unsecured Note, Due 2015, at 9 point 25 percent [Member]	Oct. 02, 2013 Subsequent Event [Member] Local Lines of Credit [Member]	Apr. 22, 2013 Notes Payable to Banks [Member] PNM Term Loan Agreement [Member]	Sep. 30, 2013 Notes Payable to Banks [Member] PNM Term Loan Agreement [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount								$ 1,000						$ 265,500,000	$ 93,200,000
Debt Instrument, Interest Rate, Stated Percentage													9.50%	9.50%	6.95%	6.95%	9.25%				1.44%
Debt Instrument, Cash Offered for Debt Exchanged								140
Cash paid in debt exchange	(13,048,000)	0				(13,048,000)	0					13,000,000
Debt Instrument, Cash for Bond Exchange Conversion																0.14
Debt Instrument, Unamortized Premium															23,200,000
Short-term debt	112,000,000		158,700,000	0	21,100,000	12,000,000			0	100,000,000	100,000,000									75,000,000
Repayments of Lines of Credit																				75,000,000
Unsecured Long-term Debt, Noncurrent																		23,000,000
Debt Instrument, Cash Paid for Unsecured Debt																		26,000,000
Debt Instruments, NMPRC Approved credit facility																			$ 50,000,000

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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The amount of debt premium that was originally recognized at the issuance of the instrument that has yet to be amortized.

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Carrying value as of the balance sheet date of uncollateralized debt obligation (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion.

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