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Capitalization, Short-term Debt (Details) (USD $) In Thousands | Jun. 30, 2011 | Dec. 31, 2010
--- | --- | ---
Short-term Debt [Line Items] |  |
Short-term debt | $ 304,000 | $ 222,000
PNM Resources [Member] | Revolving credit facility [Member] |  |
Short-term Debt [Line Items] |  |
Short-term debt | 31,000 | 32,000
PNM Resources [Member] | Local lines of credit [Member] |  |
Short-term Debt [Line Items] |  |
Short-term debt | 0 | 0
Public Service Company of New Mexico [Member] |  |
Short-term Debt [Line Items] |  |
Short-term debt | 273,000 | 190,000
Public Service Company of New Mexico [Member] | Revolving credit facility [Member] |  |
Short-term Debt [Line Items] |  |
Short-term debt | 273,000 | 190,000
Texas-New Mexico Power Company [Member] | Revolving credit facility [Member] |  |
Short-term Debt [Line Items] |  |
Short-term debt | 0 | 0
Line of Credit [Member] |  |
Short-term Debt [Line Items] |  |
Short-term debt | $ 304,000 | $ 222,000

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Period Type: | instant

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- Definition 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. + Details
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