CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
CURRENT ASSETS
Cash and cash equivalents	$ 7.1	$ 1.8
Accounts receivable, less reserve of $1.7 and $2.6, respectively	286.9	295.3
Accrued unbilled revenues	49.6	57.4
Income taxes receivable	7.2	7.2
Fuel inventories	99.7	93.3
Materials and supplies, at average cost	82.2	80.9
Price risk management	0.4	0.5
Gas imbalances	12.7	9.0
Deferred income taxes	40.6	187.7
Fuel clause under recoveries	0.4	0
Assets held for sale	0	25.5
Other	39.7	35.6
Total current assets	626.5	794.2
OTHER PROPERTY AND INVESTMENTS, at cost	55.9	52.2
PROPERTY, PLANT AND EQUIPMENT
In service	11,656.8	11,504.4
Construction work in progress	543.6	387.5
Total property, plant and equipment	12,200.4	11,891.9
Less accumulated depreciation	3,620.0	3,547.1
Net property, plant and equipment	8,580.4	8,344.8
DEFERRED CHARGES AND OTHER ASSETS
Regulatory assets	502.6	510.6
Intangible assets, net	126.0	127.4
Goodwill	39.4	39.4
Other	51.0	53.6
Total deferred charges and other assets	719.0	731.0
TOTAL ASSETS	9,981.8	9,922.2
CURRENT LIABILITIES
Short-term debt	707.0	430.9
Accounts payable	409.5	396.7
Dividends payable	41.4	41.2
Customer deposits	71.3	70.3
Accrued taxes	28.8	48.1
Accrued interest	35.7	55.0
Accrued compensation	37.1	55.2
Price risk management	0.4	0.3
Gas imbalances	5.7	5.0
Fuel clause over recoveries	81.6	109.2
Other	63.7	64.5
Total current liabilities	1,482.2	1,276.4
LONG-TERM DEBT	2,848.7	2,848.6
DEFERRED CREDITS AND OTHER LIABILITIES
Accrued benefit obligations	399.9	399.8
Deferred income taxes	1,817.7	1,948.8
Deferred investment tax credits	3.4	3.9
Regulatory liabilities	245.5	245.1
Deferred revenues	38.5	37.7
Other	93.6	89.5
Total deferred credits and other liabilities	2,598.6	2,724.8
Total liabilities	6,929.5	6,849.8
COMMITMENTS AND CONTINGENCIES (NOTE 14)
STOCKHOLDERS' EQUITY
Common stockholders' equity	1,039.7	1,047.4
Retained earnings	1,754.1	1,772.4
Accumulated other comprehensive loss, net of tax	(48.3)	(49.1)
Treasury stock, at cost	0	(3.5)
Total OGE Energy stockholders' equity	2,745.5	2,767.2
Noncontrolling interests	306.8	305.2
Total stockholders' equity	3,052.3	3,072.4
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$ 9,981.8	$ 9,922.2