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Financing, Short-term Debt (Details) (USD $)	3 Months Ended																								1 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2013 Line of Credit [Member]	Dec. 31, 2012 Line of Credit [Member]	Mar. 31, 2013 PNM Resources [Member] Revolving credit facility [Member]	Dec. 31, 2012 PNM Resources [Member] Revolving credit facility [Member]	Mar. 31, 2013 Public Service Company of New Mexico [Member]	Dec. 31, 2012 Public Service Company of New Mexico [Member]	Mar. 31, 2013 Public Service Company of New Mexico [Member] Revolving credit facility [Member]	Dec. 31, 2012 Public Service Company of New Mexico [Member] Revolving credit facility [Member]	Mar. 31, 2013 Texas-New Mexico Power Company [Member]	Dec. 31, 2012 Texas-New Mexico Power Company [Member]	Mar. 31, 2013 Texas-New Mexico Power Company [Member] Revolving credit facility [Member]	Dec. 31, 2012 Texas-New Mexico Power Company [Member] Revolving credit facility [Member]	May 01, 2013 Available Borrowing Capacity [Member]	May 01, 2013 Available Borrowing Capacity [Member] PNM Resources [Member]	May 01, 2013 Available Borrowing Capacity [Member] Public Service Company of New Mexico [Member]	May 01, 2013 Available Borrowing Capacity [Member] Texas-New Mexico Power Company [Member]	May 01, 2013 Subsequent Event [Member] PNM Resources [Member]	May 01, 2013 Subsequent Event [Member] Public Service Company of New Mexico [Member]	May 01, 2013 Subsequent Event [Member] Texas-New Mexico Power Company [Member]	May 01, 2013 Affiliated Entity [Member] Intercompany loan agreements [Member] Texas-New Mexico Power Company [Member]	Mar. 31, 2013 PNMR Term Loan Agreement [Member]	Dec. 31, 2012 PNMR Term Loan Agreement [Member]	Dec. 31, 2012 PNMR Term Loan Agreement [Member] Notes Payable to Banks [Member]
Short-term Debt [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity					$ 300,000,000				$ 400,000,000				$ 75,000,000
Line of Credit Facility, Extension Option, Years	1 year
Proceeds from Short-term Debt																									100,000,000
Short-term Debt, Weighted Average Interest Rate	1.96%						1.71%				1.83%												1.335%
Short-term debt	243,300,000	158,700,000	243,300,000	158,700,000	29,400,000	37,600,000	88,900,000	21,100,000	88,900,000	21,100,000	25,000,000	0	25,000,000	0									100,000,000	100,000,000
Line of Credit Facility, Remaining Borrowing Capacity															653,400,000	228,400,000	380,300,000	44,700,000
Short-term debt – affiliate											5,600,000	28,300,000										28,500,000
Restricted Cash and Investments																			$ 4,500,000	$ 0	$ 0

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- Definition

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Short Term Debt Due to Related Party

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- Definition

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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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 129

-Paragraph 2, 4

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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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The cash inflow from a borrowing having initial term of repayment within one year or the normal operating cycle, if longer.

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-Glossary Financing Activities

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Reflects the calculation as of the balance sheet date of the average interest rate weighted by the amount of short-term debt outstanding by type or by instrument at that time.

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