Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Appalachian Power Co [Member]
Operating Activities
Net Income	$ 70,607	$ 50,663
Adjustments to Reconcile Net Income to Net Cash Flows from (Used for) Operating Activities:
Depreciation and Amortization	136,743	150,590
Deferred Income Taxes	127,525	32,037
Carrying Costs Income	(9,981)	(16,062)
Allowance for Equity Funds Used During Construction	(2,095)	(1,291)
Mark-to-Market of Risk Management Contracts	7,343	9,975
Fuel Over/Under-Recovery, Net	(21,132)	(32,329)
Change in Other Noncurrent Assets	11,361	42,141
Change in Other Noncurrent Liabilities	5,239	(5,225)
Changes in Certain Components of Working Capital:
Accounts Receivable, Net	84,748	75,903
Fuel, Materials and Supplies	85,449	69,469
Accounts Payable	(62,795)	(100,171)
Accrued Taxes, Net	(56,411)	(38,806)
Other Current Assets	6,281	5,421
Other Current Liabilities	3,316	9,857
Net Cash Flows from (Used for) Operating Activities	386,198	252,172
Investing Activities
Construction Expenditures	(191,125)	(254,663)
Change in Advances to Affiliates, Net	(162,787)	0
Other Investing Activities	7,832	2,492
Net Cash Flows from (Used for) Investing Activities	(346,080)	(252,171)
Financing Activities
Issuance of Long-term Debt	640,164	363,913
Change in Advances from Affiliates, Net	(128,331)	17,327
Retirement of Long-term Debt	(479,661)	(200,009)
Retirement of Long-term Debt - Affiliated	0	(100,000)
Retirement of Cumulative Preferred Stock	(8)	(4)
Principal Payments for Capital Lease Obligations	(3,720)	(3,600)
Dividends Paid on Common Stock	(67,500)	(78,000)
Dividends Paid on Cumulative Preferred Stock	(400)	(399)
Other Financing Activities	19	591
Net Cash Flows from (Used for) Financing Activities	(39,437)	(181)
Net Increase (Decrease) in Cash and Cash Equivalents	681	(180)
Cash and Cash Equivalents at Beginning of Period	951	2,006
Cash and Cash Equivalents at End of Period	1,632	1,826
Supplementary Information
Cash Paid for Interest, Net of Capitalized Amounts	100,127	103,271
Net Cash Paid (Received) for Income Taxes	(33,371)	30,259
Noncash Acquisitions Under Capital Leases	565	22,344
Government Grants Included in Accounts Receivable at June 30,	4,061	0
Construction Expenditures Included in Current Liabilities at June 30,	52,421	42,890
Columbus Southern Power Co [Member]
Operating Activities
Net Income	132,086	103,766
Adjustments to Reconcile Net Income to Net Cash Flows from (Used for) Operating Activities:
Depreciation and Amortization	78,957	75,089
Deferred Income Taxes	58,594	19,833
Carrying Costs Income	(5,922)	(4,184)
Allowance for Equity Funds Used During Construction	(1,318)	(1,235)
Mark-to-Market of Risk Management Contracts	4,206	1,466
Property Taxes	57,078	48,526
Fuel Over/Under-Recovery, Net	(12,072)	32,120
Change in Other Noncurrent Assets	(24,713)	(17,051)
Change in Other Noncurrent Liabilities	8,023	(2,458)
Changes in Certain Components of Working Capital:
Accounts Receivable, Net	51,840	(17,458)
Fuel, Materials and Supplies	16,424	(3,512)
Accounts Payable	(19,262)	(12,744)
Accrued Taxes, Net	(107,239)	(89,647)
Other Current Assets	5,200	8,582
Other Current Liabilities	(34,703)	12,262
Net Cash Flows from (Used for) Operating Activities	213,101	157,539
Investing Activities
Construction Expenditures	(92,578)	(84,208)
Change in Other Cash Deposits	0	10,289
Change in Advances to Affiliates, Net	(17,121)	(57,069)
Acquisitions of Assets	(527)	(463)
Proceeds from Sales of Assets	6,280	3,410
Other Investing Activities	18,286	0
Net Cash Flows from (Used for) Investing Activities	(85,660)	(128,041)
Financing Activities
Issuance of Long-term Debt	0	149,443
Change in Advances from Affiliates, Net	0	(24,202)
Retirement of Long-term Debt - Affiliated	0	(100,000)
Principal Payments for Capital Lease Obligations	(1,674)	(2,237)
Dividends Paid on Common Stock	(125,000)	(52,500)
Other Financing Activities	19	95
Net Cash Flows from (Used for) Financing Activities	(126,655)	(29,401)
Net Increase (Decrease) in Cash and Cash Equivalents	786	97
Cash and Cash Equivalents at Beginning of Period	509	1,096
Cash and Cash Equivalents at End of Period	1,295	1,193
Supplementary Information
Cash Paid for Interest, Net of Capitalized Amounts	38,250	43,615
Net Cash Paid (Received) for Income Taxes	26,797	54,032
Noncash Acquisitions Under Capital Leases	580	9,196
Government Grants Included in Accounts Receivable at June 30,	2,000	0
Construction Expenditures Included in Current Liabilities at June 30,	8,811	14,594
Indiana Michigan Power Co [Member]
Operating Activities
Net Income	76,813	59,660
Adjustments to Reconcile Net Income to Net Cash Flows from (Used for) Operating Activities:
Depreciation and Amortization	67,350	67,802
Deferred Income Taxes	42,561	23,213
Amortization (Deferral) of Incremental Nuclear Refueling Outage Expense, Net	23,086	(16,103)
Allowance for Equity Funds Used During Construction	(7,440)	(9,002)
Mark-to-Market of Risk Management Contracts	6,183	(4,314)
Amortization of Nuclear Fuel	72,474	69,478
Fuel Over/Under-Recovery, Net	2,947	11,389
Change in Other Noncurrent Assets	4,433	7,224
Change in Other Noncurrent Liabilities	12,055	33,814
Changes in Certain Components of Working Capital:
Accounts Receivable, Net	74,240	(2,965)
Fuel, Materials and Supplies	26,103	(26,832)
Accounts Payable	(76,440)	(31,079)
Accrued Taxes, Net	13,775	4,470
Received (Deferred) Cook Plant Fire Costs	0	61,906
Other Current Assets	(887)	(284)
Other Current Liabilities	(321)	20,087
Net Cash Flows from (Used for) Operating Activities	336,932	268,464
Investing Activities
Construction Expenditures	(133,064)	(160,797)
Change in Advances to Affiliates, Net	0	(12,503)
Purchases of Investment Securities	(492,162)	(617,059)
Sales of Investment Securities	464,688	592,263
Acquisitions of Nuclear Fuel	(93,230)	(41,357)
Other Investing Activities	17,125	(345)
Net Cash Flows from (Used for) Investing Activities	(236,643)	(239,798)
Financing Activities
Issuance of Long-term Debt	76,624	84,564
Change in Advances from Affiliates, Net	(18,232)	0
Retirement of Long-term Debt	(116,526)	(19,208)
Retirement of Long-term Debt - Affiliated	0	(25,000)
Principal Payments for Capital Lease Obligations	(4,317)	(17,669)
Dividends Paid on Common Stock	(37,500)	(51,500)
Dividends Paid on Cumulative Preferred Stock	(170)	(170)
Other Financing Activities	25	270
Net Cash Flows from (Used for) Financing Activities	(100,096)	(28,713)
Net Increase (Decrease) in Cash and Cash Equivalents	193	(47)
Cash and Cash Equivalents at Beginning of Period	361	779
Cash and Cash Equivalents at End of Period	554	732
Supplementary Information
Cash Paid for Interest, Net of Capitalized Amounts	47,401	50,759
Net Cash Paid (Received) for Income Taxes	(19,847)	8,092
Noncash Acquisitions Under Capital Leases	1,218	8,844
Construction Expenditures Included in Current Liabilities at June 30,	36,109	19,220
Acquisition of Nuclear Fuel Included in Current Liabilities at June 30,	0	123
Ohio Power Co [Member]
Operating Activities
Net Income	176,078	129,451
Adjustments to Reconcile Net Income to Net Cash Flows from (Used for) Operating Activities:
Depreciation and Amortization	184,153	179,222
Deferred Income Taxes	57,132	72,638
Carrying Costs Income	(14,656)	(10,555)
Allowance for Equity Funds Used During Construction	(1,393)	(2,017)
Mark-to-Market of Risk Management Contracts	5,285	2,359
Property Taxes	50,997	48,578
Fuel Over/Under-Recovery, Net	(38,041)	(75,987)
Change in Other Noncurrent Assets	(35,326)	(7,571)
Change in Other Noncurrent Liabilities	16,911	(2,326)
Changes in Certain Components of Working Capital:
Accounts Receivable, Net	70,725	44,027
Fuel, Materials and Supplies	49,810	25,508
Accounts Payable	(51,175)	(23,991)
Accrued Taxes, Net	(49,177)	(71,199)
Other Current Assets	1,672	2,680
Other Current Liabilities	4,165	41,461
Net Cash Flows from (Used for) Operating Activities	427,160	352,278
Investing Activities
Construction Expenditures	(111,851)	(147,831)
Change in Advances to Affiliates, Net	(36,465)	265,601
Acquisitions of Assets	(1,187)	(2,113)
Proceeds from Sales of Assets	41,766	4,245
Other Investing Activities	1,208	(314)
Net Cash Flows from (Used for) Investing Activities	(106,529)	119,588
Financing Activities
Issuance of Long-term Debt	49,768	163,944
Retirement of Long-term Debt	(165,000)	(479,450)
Retirement of Cumulative Preferred Stock	(1)	0
Principal Payments for Capital Lease Obligations	(4,180)	(3,903)
Dividends Paid on Common Stock	(200,000)	(150,575)
Dividends Paid on Cumulative Preferred Stock	(366)	(366)
Other Financing Activities	(140)	(2,562)
Net Cash Flows from (Used for) Financing Activities	(319,919)	(472,912)
Net Increase (Decrease) in Cash and Cash Equivalents	712	(1,046)
Cash and Cash Equivalents at Beginning of Period	440	1,984
Cash and Cash Equivalents at End of Period	1,152	938
Supplementary Information
Cash Paid for Interest, Net of Capitalized Amounts	70,886	78,747
Net Cash Paid (Received) for Income Taxes	25,679	27,206
Noncash Acquisitions Under Capital Leases	422	23,489
Construction Expenditures Included in Current Liabilities at June 30,	17,908	10,567
Public Service Co Of Oklahoma [Member]
Operating Activities
Net Income	46,949	19,628
Adjustments to Reconcile Net Income to Net Cash Flows from (Used for) Operating Activities:
Depreciation and Amortization	47,959	54,208
Deferred Income Taxes	33,821	33,402
Carrying Costs Income	(2,523)	(1,686)
Allowance for Equity Funds Used During Construction	(650)	(366)
Mark-to-Market of Risk Management Contracts	(292)	(2,448)
Property Taxes	(18,742)	(18,532)
Fuel Over/Under-Recovery, Net	(55)	(99,776)
Change in Other Noncurrent Assets	8,705	(13,891)
Change in Other Noncurrent Liabilities	21,377	2,900
Changes in Certain Components of Working Capital:
Accounts Receivable, Net	32,603	(1,789)
Fuel, Materials and Supplies	(3,744)	(3,280)
Accounts Payable	29,830	37,817
Accrued Taxes, Net	16,468	4,838
Other Current Assets	(3,070)	2,760
Other Current Liabilities	10,048	(5,312)
Net Cash Flows from (Used for) Operating Activities	218,684	8,473
Investing Activities
Construction Expenditures	(65,343)	(107,213)
Change in Advances to Affiliates, Net	(110)	62,695
Other Investing Activities	760	(2,179)
Net Cash Flows from (Used for) Investing Activities	(64,693)	(46,697)
Financing Activities
Issuance of Long-term Debt	247,554	0
Change in Advances from Affiliates, Net	(91,382)	66,229
Retirement of Long-term Debt	(275,000)	0
Retirement of Cumulative Preferred Stock	0	(301)
Principal Payments for Capital Lease Obligations	(2,068)	(2,040)
Dividends Paid on Common Stock	(32,500)	(25,375)
Dividends Paid on Cumulative Preferred Stock	(98)	(103)
Other Financing Activities	6	107
Net Cash Flows from (Used for) Financing Activities	(153,488)	38,517
Net Increase (Decrease) in Cash and Cash Equivalents	503	293
Cash and Cash Equivalents at Beginning of Period	470	796
Cash and Cash Equivalents at End of Period	973	1,089
Supplementary Information
Cash Paid for Interest, Net of Capitalized Amounts	12,293	30,152
Net Cash Paid (Received) for Income Taxes	383	(8,073)
Noncash Acquisitions Under Capital Leases	415	13,434
Construction Expenditures Included in Current Liabilities at June 30,	8,319	13,534
Southwestern Electric Power Co [Member]
Operating Activities
Net Income	80,898	57,788
Adjustments to Reconcile Net Income to Net Cash Flows from (Used for) Operating Activities:
Depreciation and Amortization	66,008	63,111
Deferred Income Taxes	23,562	(5,742)
Allowance for Equity Funds Used During Construction	(22,169)	(27,979)
Mark-to-Market of Risk Management Contracts	(1,863)	715
Property Taxes	(20,356)	(18,105)
Fuel Over/Under-Recovery, Net	(25,144)	(15,619)
Change in Other Noncurrent Assets	17,791	(11,364)
Change in Other Noncurrent Liabilities	27,255	17,928
Changes in Certain Components of Working Capital:
Accounts Receivable, Net	9,062	(24,733)
Fuel, Materials and Supplies	(8,929)	20,096
Accounts Payable	37,823	(10,505)
Accrued Taxes, Net	24,753	32,339
Other Current Assets	(1,485)	(825)
Other Current Liabilities	2,657	3,704
Net Cash Flows from (Used for) Operating Activities	209,863	80,809
Investing Activities
Construction Expenditures	(237,834)	(176,107)
Change in Advances to Affiliates, Net	51,538	(193,437)
Other Investing Activities	(7,953)	(2,016)
Net Cash Flows from (Used for) Investing Activities	(194,249)	(371,560)
Financing Activities
Issuance of Long-term Debt	0	399,411
Credit Facility Borrowings	27,413	50,339
Retirement of Long-term Debt	0	(53,500)
Retirement of Long-term Debt - Affiliated	0	(50,000)
Retirement of Cumulative Preferred Stock	(1)	0
Credit Facility Repayments	(33,630)	(48,512)
Principal Payments for Capital Lease Obligations	(6,655)	(5,944)
Dividends Paid on Common Stock	(2,126)	(1,892)
Dividends Paid on Cumulative Preferred Stock	(114)	(114)
Other Financing Activities	74	864
Net Cash Flows from (Used for) Financing Activities	(15,039)	290,652
Net Increase (Decrease) in Cash and Cash Equivalents	575	(99)
Cash and Cash Equivalents at Beginning of Period	1,514	1,661
Cash and Cash Equivalents at End of Period	2,089	1,562
Supplementary Information
Cash Paid for Interest, Net of Capitalized Amounts	37,681	29,649
Net Cash Paid (Received) for Income Taxes	8,026	19,663
Noncash Acquisitions Under Capital Leases	4,378	380
Construction Expenditures Included in Current Liabilities at June 30,	$ 96,959	$ 85,870