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Fair Value of Derivative and Other Financial Instruments - Items Recorded at Fair Value (Details) - PNMR and PNM [Member] - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value $ 272,977 $ 259,042
Cash and equivalents [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 23,683 10,700
Domestic value [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 34,796 44,505
Domestic growth [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 47,595 61,078
International and other [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 27,481 27,961
U.S. Government [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 40,962 27,880
Municipals [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 43,789 58,576
Corporate and other [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 54,671 28,342
Measured on a recurring basis [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 272,977 259,042
Measured on a recurring basis [Member] | Commodity Contract [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Commodity derivative assets 5,224 6,435
Commodity derivative liabilities (2,339) (1,859)
Net 2,885 4,576
Measured on a recurring basis [Member] | Cash and equivalents [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 23,683 10,700
Measured on a recurring basis [Member] | Domestic value [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 34,796 44,505
Measured on a recurring basis [Member] | Domestic growth [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 47,595 61,078
Measured on a recurring basis [Member] | International and other [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 27,481 27,961
Measured on a recurring basis [Member] | U.S. Government [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 40,962 27,880
Measured on a recurring basis [Member] | Municipals [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 43,789 58,576
Measured on a recurring basis [Member] | Corporate and other [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 54,671 28,342
Measured on a recurring basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member}    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 196,436 177,352
Measured on a recurring basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member} | Commodity Contract [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Commodity derivative assets 0 0
Commodity derivative liabilities 0 0
Net 0 0
Measured on a recurring basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member} | Cash and equivalents [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 23,683 10,700
Measured on a recurring basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member} | Domestic value [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 34,796 44,505
Measured on a recurring basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member} | Domestic growth [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 47,595 61,078
Measured on a recurring basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member} | International and other [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 27,481 27,961
Measured on a recurring basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member} | U.S. Government [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 39,723 26,608
Measured on a recurring basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member} | Municipals [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 0 0
Measured on a recurring basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member} | Corporate and other [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 23,158 6,500
Measured on a recurring basis [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 76,541 81,690
Measured on a recurring basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Commodity Contract [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Commodity derivative assets 5,224 6,435
Commodity derivative liabilities (2,339) (1,859)
Net 2,885 4,576
Measured on a recurring basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Cash and equivalents [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 0 0
Measured on a recurring basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Domestic value [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 0 0
Measured on a recurring basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Domestic growth [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 0 0
Measured on a recurring basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | International and other [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 0 0
Measured on a recurring basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | U.S. Government [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 1,239 1,272
Measured on a recurring basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Municipals [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 43,789 58,576
Measured on a recurring basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Corporate and other [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value $ 31,513 $ 21,842