Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2012

Commitments and Contingencies [Abstract]

Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]

Operating Lease Obligations

The Company has operating lease obligations expiring at various dates, primarily for OG&E railcar leases, OG&E wind farm land leases and OGE Energy and Enogex noncancellable operating leases. Future minimum payments for noncancellable operating leases are as follows:



Year ended December 31 (In millions)	2013		2014		2015		2016		2017		After 2017		Total
Operating lease obligations
OG&E railcars	$	3.2	$	2.8	$	2.7	$	27.3	$	—	$	—	$	36.0
OG&E wind farm land leases	2.0		2.1		2.1		2.1		2.4		51.2		61.9
OGE Energy noncancellable operating lease	0.3		0.8		0.8		0.8		0.8		0.7		4.2
Enogex noncancellable operating leases	5.2		3.7		3.5		3.4		0.7		—		16.5
Total operating lease obligations	$	10.7	$	9.4	$	9.1	$	33.6	$	3.9	$	51.9	$	118.6

Unrecorded Unconditional Purchase Obligations Disclosure [Table Text Block]

Other Purchase Obligations and Commitments

The Company's other future purchase obligations and commitments estimated for the next five years are as follows:



(In millions)	2013		2014		2015		2016		2017		Total
Other purchase obligations and commitments
OG&E cogeneration capacity and fixed operation and maintenance payments	$	87.9	$	85.8	$	84.5	$	82.4	$	80.1	$	420.7
OG&E expected cogeneration energy payments	58.6		63.8		70.5		81.0		87.3		361.2
OG&E minimum fuel purchase commitments	405.0		255.0		264.8		—		—		924.8
OG&E expected wind purchase commitments	57.5		58.0		58.9		59.8		60.8		295.0
OG&E long-term service agreement commitments	8.0		27.8		6.7		6.2		6.4		55.1
EER commitments	11.9		10.8		4.7		0.8		—		28.2
Total other purchase obligations and commitments	$	628.9	$	501.2	$	490.1	$	230.2	$	234.6	$	2,085.0

Schedule of Wind Power Purchases [Table Text Block]

The following table summarizes OG&E's wind power purchases for the years ended December 31, 2012, 2011 and 2010.



Year ended December 31 (In millions)	2012		2011		2010
CPV Keenan	$	25.1	$	24.5	$	3.8
Edison Mission Energy	20.2		8.5		—
FPL Energy	3.4		3.7		3.9
NextEra Energy	0.8		—		—
Total wind power purchased	$	49.5	$	36.7	$	7.7

- Definition

Tabular disclosure of unconditional purchase obligations that are not recognized as a liability on the balance sheet, including the nature and significant terms of an unconditional purchase obligation; the amount of the fixed and determinable portion of the obligation as of the date of the latest balance sheet presented in the aggregate and, if determinable, for each of the five succeeding fiscal years; the nature of any variable components of the obligation; the amount purchased under the obligation (for example, the take-or-pay or throughput contract) for the reporting period; and may include the amount of imputed interest necessary to reduce the obligation to present value.

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