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Related Party Transactions (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Electricity, transmission and distribution related services [Member] | TNMP to PNMR [Member]
       
Related Party Transaction [Line Items]        
Amount of related party transaction $ 0 $ 12,196 $ 0 $ 30,608
Service billings [Member] | TNMP to PNMR [Member]
       
Related Party Transaction [Line Items]        
Amount of related party transaction 4 48 12 145
Service billings [Member] | PNMR to PNM [Member]
       
Related Party Transaction [Line Items]        
Amount of related party transaction 22,143 24,680 68,030 70,849
Service billings [Member] | PNMR to TNMP [Member]
       
Related Party Transaction [Line Items]        
Amount of related party transaction 6,439 7,295 20,206 21,250
Service billings [Member] | PNM to TNMP [Member]
       
Related Party Transaction [Line Items]        
Amount of related party transaction 184 40 473 327
Service billings [Member] | PNMR to Optim Energy [Member]
       
Related Party Transaction [Line Items]        
Amount of related party transaction 0 1,277 0 4,083
Service billings [Member] | Optim Energy to PNMR [Member]
       
Related Party Transaction [Line Items]        
Amount of related party transaction 0 4 0 23
Income tax sharing payments [Member] | PNMR to PNM [Member]
       
Related Party Transaction [Line Items]        
Amount of related party transaction 0 0 63,114 0
Income tax sharing payments [Member] | PNMR to TNMP [Member]
       
Related Party Transaction [Line Items]        
Amount of related party transaction 0 0 1,952 0
Interest charges [Member] | PNMR to PNM [Member]
       
Related Party Transaction [Line Items]        
Amount of related party transaction 0 9 1 45
Interest charges [Member] | PNMR to TNMP [Member]
       
Related Party Transaction [Line Items]        
Amount of related party transaction 22 8 72 36
Interest charges [Member] | PNM to PNMR [Member]
       
Related Party Transaction [Line Items]        
Amount of related party transaction $ 45 $ 33 $ 134 $ 97