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Lease Commitments (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	May 01, 2014 MW	Jun. 01, 2014	Jan. 14, 2016
Public Service Company of New Mexico [Member]
Operating Leased Assets [Line Items]
Public Utilities, Option to Purchase Leased Capacity At Fair Value	7.7
Public Service Company of New Mexico [Member] \| TGP Granada, LLC and its affiliate Complaint [Member]
Operating Leased Assets [Line Items]
Public Utilities, Lease ownership percentage in EIP	60.00%
Public Service Company of New Mexico [Member] \| Palo Verde Nuclear Generating Station, Unit 2 Leases 31.2494 MW [Member]
Operating Leased Assets [Line Items]
Purchase Price of Leased Asset to be paid	78.1
Public Service Company of New Mexico [Member] \| Palo Verde Nuclear Generating Station, Unit 2 Leases [Member]
Operating Leased Assets [Line Items]
Leased Capacity to be Purchased		32.76
Public Service Company of New Mexico [Member] \| Palo Verde Nuclear Generating Station, Unit 2 Leases, January 15, 2016 [Member]
Operating Leased Assets [Line Items]
Leased Capacity to be Purchased	31.25
Public Service Company of New Mexico [Member] \| Palo Verde Nuclear Generating Station, Unit 2 Leases 32.76 MW [Member]
Operating Leased Assets [Line Items]
Purchase Price of Leased Asset to be paid	85.2
Early Purchase Price of Leased Asset, Period 1			79.9
Early Purchase Price of Leased Asset	82.5
Public Service Company of New Mexico [Member] \| Palo Verde Nuclear Generating Station, Unit 2 Leases 32.76 MW [Member] \| Maximum [Member]
Operating Leased Assets [Line Items]
Additional consideration for early purchase of leased asset, Period 1			5.8
Additional consideration for early purchase of leased asset, Period 2	2.7
Tortoise Capital Resources Corporation [Member] \| TGP Granada, LLC and its affiliate Complaint [Member]
Operating Leased Assets [Line Items]
Public Utilities, Lease ownership percentage in EIP	40.00%
Subsequent Event [Member] \| Public Service Company of New Mexico [Member] \| Palo Verde Nuclear Generating Station, Unit 2 Leases 32.76 MW [Member]
Operating Leased Assets [Line Items]
Purchase Price of Leased Asset, Period 3				85.2
Subsequent Event [Member] \| Public Service Company of New Mexico [Member] \| Palo Verde Nuclear Generating Station, Unit 2 Leases 32.76 MW [Member] \| Minimum [Member]
Operating Leased Assets [Line Items]
Additional consideration for early purchase of leased asset effective June 1, 2014				$ 1.2