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Fair Value of Derivative and Other Financial Instruments, Recurring (Details) (PNMR and PNM [Member], Measured on a recurring basis [Member], USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Estimate of Fair Value, Fair Value Disclosure [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
NDT Investments $ 192,511 [1] $ 168,851 [1]
Level 1 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
NDT Investments   114,259
Level 2 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
NDT Investments   54,592
Cash and equivalents [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
NDT Investments 4,628 [1] 2,766 [1]
Cash and equivalents [Member] | Level 1 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
NDT Investments 4,628 2,766
Cash and equivalents [Member] | Level 2 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
NDT Investments 0 0
Domestic value [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
NDT Investments 30,044 [1] 25,143 [1]
Domestic value [Member] | Level 1 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
NDT Investments 30,044 25,143
Domestic value [Member] | Level 2 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
NDT Investments 0 0
Domestic growth [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
NDT Investments 51,650 [1] 52,187 [1]
Domestic growth [Member] | Level 1 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
NDT Investments 51,650 52,187
Domestic growth [Member] | Level 2 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
NDT Investments 0 0
International and other [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
NDT Investments 14,868 [1] 12,754 [1]
International and other [Member] | Level 1 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
NDT Investments 14,868 12,754
International and other [Member] | Level 2 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
NDT Investments 0 0
U.S. Government [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
NDT Investments 32,592 [1] 25,367 [1]
U.S. Government [Member] | Level 1 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
NDT Investments 27,737 21,409
U.S. Government [Member] | Level 2 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
NDT Investments 4,855 3,958
Municipals [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
NDT Investments 43,861 [1] 41,463 [1]
Municipals [Member] | Level 1 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
NDT Investments 0 0
Municipals [Member] | Level 2 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
NDT Investments 43,861 41,463
Corporate and other [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
NDT Investments 14,868 [1] 9,171 [1]
Corporate and other [Member] | Level 1 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
NDT Investments 0 0
Corporate and other [Member] | Level 2 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
NDT Investments 14,868 9,171
Commodity Contract [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Commodity derivative instruments, Assets 4,137 3,713
Commodity derivative instruments, Liabilities (2,933) (4,069)
Commodity derivative instruments, Net 1,204 [1] (356) [1]
Commodity Contract [Member] | Level 1 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Commodity derivative instruments, Assets 0 0
Commodity derivative instruments, Liabilities 0 0
Commodity derivative instruments, Net   0
Commodity Contract [Member] | Level 2 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Commodity derivative instruments, Assets 4,137 3,713
Commodity derivative instruments, Liabilities (2,933) (4,069)
Commodity derivative instruments, Net   $ (356)
[1] The Level 1 and 2 columns in the above table are presented based on the nature of each instrument. The total column is presented based on the balance sheet classification of the instruments. There were no account reclassifications between commodity derivative assets and commodity derivative liabilities and there were no Level 3 fair value measurements at December 31, 2012 and 2011.