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Capitalization, Line of Credit (Details) (USD $)	Oct. 31, 2011	Sep. 30, 2011	Sep. 30, 2010	Dec. 31, 2009	Oct. 31, 2011 PNM Resources [Member]	Oct. 30, 2011 PNM Resources [Member] Revolving credit facility [Member]	Sep. 30, 2011 PNM Resources [Member] Revolving credit facility [Member]	Sep. 30, 2011 PNM Resources [Member] Local lines of credit [Member]	Oct. 31, 2011 Public Service Company of New Mexico [Member]	Sep. 30, 2011 Public Service Company of New Mexico [Member]	Dec. 31, 2010 Public Service Company of New Mexico [Member]	Sep. 30, 2010 Public Service Company of New Mexico [Member]	Dec. 31, 2009 Public Service Company of New Mexico [Member]	Oct. 31, 2011 Public Service Company of New Mexico [Member] Affiliated Entity [Member]	Sep. 30, 2011 Public Service Company of New Mexico [Member] Affiliated Entity [Member]	Oct. 30, 2011 Public Service Company of New Mexico [Member] Revolving credit facility [Member]	Sep. 30, 2011 Public Service Company of New Mexico [Member] Revolving credit facility [Member]	Oct. 31, 2011 Texas-New Mexico Power Company [Member]	Oct. 27, 2011 Texas-New Mexico Power Company [Member]	Sep. 30, 2011 Texas-New Mexico Power Company [Member]	Dec. 31, 2010 Texas-New Mexico Power Company [Member]	Sep. 30, 2010 Texas-New Mexico Power Company [Member]	Dec. 31, 2009 Texas-New Mexico Power Company [Member]	Oct. 31, 2011 Texas-New Mexico Power Company [Member] Affiliated Entity [Member]	Sep. 30, 2011 Texas-New Mexico Power Company [Member] Affiliated Entity [Member]	Sep. 30, 2011 Texas-New Mexico Power Company [Member] Revolving credit facility [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity						$ 517,000,000		$ 5,000,000								$ 368,000,000										$ 75,000,000
Short-term Debt, Weighted Average Interest Rate							1.48%										0.88%
Line of Credit Facility, Remaining Borrowing Capacity	704,900,000				235,400,000				394,800,000									74,700,000
Cash and cash equivalents		25,760,000	25,097,000	14,641,000	166,700,000					5,034,000	10,336,000	8,991,000	1,373,000						0	9,000,000	1,000	96,000	138,000
Short-term debt – affiliate														$ 63,800,000	$ 0					$ 0	$ 1,200,000			$ 5,400,000	$ 0

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Short Term Debt Due to Related Party

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Includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Entity may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Compensating balance arrangements that do not legally restrict the withdrawal or usage of cash amounts may be reported as Cash and Cash Equivalents, while legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or company statements of intention with regard to particular deposits are not generally reported as cash and cash equivalents. Includes cash and cash equivalents associated with the entity's continuing operations. Excludes cash and cash equivalents associated with the disposal group (and discontinued operation).

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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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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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