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Lease Commitments (Details) - Public Service Company of New Mexico [Member]
$ in Millions
Jan. 15, 2016
USD ($)
lease
MW
Mar. 31, 2015
Sep. 30, 2016
USD ($)
Apr. 01, 2015
USD ($)
Jan. 15, 2015
lease
Operating Leased Assets [Line Items]          
Ownership of the EIP   60.00%      
Percent leased, now expired   40.00%      
Leased capacity at fair market value, elected to purchase | $       $ 7.7  
Palo Verde Nuclear Generating Station, Unit 1 Leases [Member]          
Operating Leased Assets [Line Items]          
Number of leases, expiring         4
Number of leases under which lease term was extended         4
Palo Verde Nuclear Generating Station, Unit 2 Leases [Member]          
Operating Leased Assets [Line Items]          
Number of leases, expiring 4        
Number of leases under which lease term was extended 1        
Number of leases under which assets were purchased 3        
Leased capacity to be purchased (in megawatts) | MW 32.76        
Palo Verde Nuclear Generating Station, Unit 2 Leases, 31.25 MW [Member]          
Operating Leased Assets [Line Items]          
Number of leases under which assets were purchased 1        
Payment to lessors | $ $ 78.1        
Palo Verde Nuclear Generating Station, Unit 2 Leases, January 15, 2016 [Member]          
Operating Leased Assets [Line Items]          
Leased capacity to be purchased (in megawatts) | MW 31.2494        
Palo Verde Nuclear Generating Station, Unit 2 Leases 32.76 MW [Member]          
Operating Leased Assets [Line Items]          
Number of leases under which assets were purchased 2        
Payment to lessors | $ $ 85.2        
Palo Verde Nuclear Generating Station [Member]          
Operating Leased Assets [Line Items]          
Loss contingency, lease arrangements | $     $ 176.1