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Financing, Short-term Debt (Details) (USD $)					3 Months Ended																					1 Months Ended
	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2013 Line of Credit [Member]	Dec. 31, 2012 Line of Credit [Member]	Sep. 30, 2013 Revolving Credit Facility [Member]	Sep. 30, 2013 PNM Resources [Member] Revolving Credit Facility [Member]	Dec. 31, 2012 PNM Resources [Member] Revolving Credit Facility [Member]	Sep. 30, 2013 Public Service Company of New Mexico [Member]	Dec. 31, 2012 Public Service Company of New Mexico [Member]	Sep. 30, 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]	Sep. 30, 2013 Texas-New Mexico Power Company [Member]	Dec. 31, 2012 Texas-New Mexico Power Company [Member]	Sep. 30, 2013 Texas-New Mexico Power Company [Member] Revolving Credit Facility [Member]	Dec. 31, 2012 Texas-New Mexico Power Company [Member] Revolving Credit Facility [Member]	Oct. 25, 2013 Available Borrowing Capacity [Member]	Oct. 25, 2013 Available Borrowing Capacity [Member] PNM Resources [Member]	Oct. 25, 2013 Available Borrowing Capacity [Member] Public Service Company of New Mexico [Member]	Oct. 25, 2013 Available Borrowing Capacity [Member] Texas-New Mexico Power Company [Member]	Oct. 25, 2013 Subsequent Event [Member] PNM Resources [Member]	Oct. 25, 2013 Subsequent Event [Member] Public Service Company of New Mexico [Member]	Oct. 25, 2013 Subsequent Event [Member] Texas-New Mexico Power Company [Member]	Oct. 25, 2013 Affiliated Entity [Member] Intercompany loan agreements [Member] Texas-New Mexico Power Company [Member]	Sep. 30, 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]	Sep. 30, 2013 First Mortgage Bonds Due 2014, Series 2009A, at 9 point 50 percent [Member] Texas-New Mexico Power Company [Member] Revolving Credit Facility [Member]	Sep. 30, 2013 PNM Term Loan Agreement [Member] Notes Payable to Banks [Member]	Apr. 22, 2013 PNM Term Loan Agreement [Member] Notes Payable to Banks [Member]
Short-term Debt [Line Items]
Short term debt, number of options to extend					2
Debt Instrument, Interest Rate, Stated Percentage																												1.44%
Line of Credit Facility, Maximum Borrowing Capacity						$ 300,000,000				$ 400,000,000				$ 75,000,000
Debt Instrument, Collateral Amount																											75,000,000
Proceeds from Short-term Debt																										100,000,000
Short-term Debt, Weighted Average Interest Rate	1.31%											1.30%
Short-term debt	112,000,000	158,700,000	112,000,000	158,700,000		0	37,600,000	0	21,100,000	0	21,100,000	12,000,000	0	12,000,000	0									100,000,000	100,000,000				75,000,000
Line of Credit Facility, Remaining Borrowing Capacity																755,900,000	291,400,000	396,800,000	67,700,000
Short-term debt – affiliate												33,100,000	28,300,000										43,000,000
Restricted Cash and Investments																				$ 6,500,000	$ 15,700,000	$ 0
Short term debt, option to extend - period of extension					1 year

X

- Definition

Short Term Debt Due to Related Party

+ References

No definition available.

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- Definition

Short term debt, number of options to extend

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Short term debt, option to extend - period of extension

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- Definition

Amount of assets pledged to secure a debt instrument.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 470

-Section 50

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- Definition

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

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

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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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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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-Name Accounting Standards Codification

-Glossary Financing Activities

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Cash and investments whose use in whole or in part is restricted for the long-term, generally by contractual agreements or regulatory requirements. For use in an unclassified balance sheet.

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Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

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Weighted average interest rate of short-term debt outstanding.

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