Financing, Financing Activities (Details) (USD $)					3 Months Ended
	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2014 Public Service Company of New Mexico [Member] PNM 2014 Term Loan Agreement [Member]	Mar. 05, 2014 Public Service Company of New Mexico [Member] PNM 2014 Term Loan Agreement [Member]	Sep. 30, 2014 Texas-New Mexico Power Company [Member] Notes Payable to Banks [Member]	Sep. 30, 2014 Texas-New Mexico Power Company [Member] 2011 Term Loan Agreement, First Mortgage Bonds Due 2014 [Member]	Sep. 30, 2014 Local Lines of Credit [Member] Public Service Company of New Mexico [Member]	Jan. 08, 2014 Local Lines of Credit [Member] Public Service Company of New Mexico [Member]	Dec. 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]	Dec. 09, 2013 First Mortgage Bonds Due 2024, Series 2014A, at 4 point 03 percent [Member] [Member] Texas-New Mexico Power Company [Member] Bonds [Member]
Debt Instrument [Line Items]
Debt Instruments, NMPRC Approved credit facility								$ 50,000,000
Long-term Debt				175,000,000
Short-term debt	100,000,000	149,200,000					0		0	75,000,000
Debt Instrument, Interest Rate at Period End			1.10%
Debt Instrument, Face Amount											80,000,000
Debt Instrument, Interest Rate, Stated Percentage											4.03%
Proceeds from Bank Debt					$ 30,000,000	$ 50,000,000