Condensed Consolidated Balance Sheets - USD ($) $ in Thousands		Jun. 30, 2015	Dec. 31, 2014
Current Assets
Cash and Cash Equivalents		$ 195,000	$ 163,000
Other Temporary Investments		356,000	386,000
Accounts Receivable:
Customers		815,000	727,000
Accrued Unbilled Revenues		64,000	146,000
Pledged Accounts Receivable - AEP Credit		997,000	987,000
Miscellaneous		71,000	87,000
Allowance for Uncollectible Accounts		(27,000)	(21,000)
Total Accounts Receivable		1,920,000	1,926,000
Fuel		424,000	587,000
Materials and Supplies		736,000	738,000
Risk Management Assets		172,000	178,000
Regulatory Asset for Under-Recovered Fuel Costs		125,000	127,000
Margin Deposits		87,000	95,000
Prepayments and Other Current Assets		210,000	278,000
TOTAL CURRENT ASSETS		4,225,000	4,478,000
Property, Plant and Equipment
Generation		25,619,000	25,727,000
Transmission		13,020,000	12,433,000
Distribution		17,594,000	17,157,000
Other Property, Plant and Equipment		4,718,000	5,770,000
Construction Work in Progress		3,651,000	3,218,000
Total Property, Plant and Equipment		64,602,000	64,305,000
Accumulated Depreciation and Amortization		19,589,000	20,188,000
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET		45,013,000	44,117,000
Other Noncurrent Assets
Regulatory Assets		5,021,000	4,264,000
Securitized Assets		1,931,000	2,072,000
Spent Nuclear Fuel and Decommissioning Trusts		2,106,000	2,096,000
Goodwill		91,000	91,000
Long-term Risk Management Assets		363,000	294,000
Deferred Charges and Other Noncurrent Assets		2,188,000	2,221,000
TOTAL OTHER NONCURRENT ASSETS		11,700,000	11,038,000
TOTAL ASSETS		60,938,000	59,633,000
Current Liabilities
Accounts Payable		1,236,000	1,287,000
Short-term Debt:
Securitized Debt for Receivables - AEP Credit	[1]	708,000	744,000
Other Short-term Debt		397,000	602,000
Total Short-term Debt		1,105,000	1,346,000
Long-term Debt Due Within One Year		1,817,000	2,503,000
Long-term Debt Due Within One Year - Affiliated		0	0
Risk Management Liabilities		78,000	92,000
Customer Deposits		335,000	324,000
Accrued Taxes		749,000	871,000
Accrued Interest		232,000	239,000
Regulatory Liability for Over-Recovered Fuel Costs		39,000	55,000
Other Current Liabilities		1,059,000	1,250,000
TOTAL CURRENT LIABILITIES		6,650,000	7,967,000
Noncurrent Liabilities
Long-term Debt		17,761,000	16,181,000
Long-term Risk Management Liabilities		174,000	131,000
Deferred Income Taxes		11,426,000	10,986,000
Regulatory Liabilities and Deferred Investment Tax Credits		3,850,000	3,892,000
Asset Retirement Obligations		2,038,000	1,951,000
Employee Benefits and Pension Obligations		509,000	630,000
Deferred Credits and Other Noncurrent Liabilities		1,088,000	1,071,000
TOTAL NONCURRENT LIABILITIES		36,846,000	34,842,000
TOTAL LIABILITIES		$ 43,496,000	$ 42,809,000
Rate Matters
Commitments and Contingencies
Equity
Common Stock		$ 3,321,000	$ 3,313,000
Paid-in Capital		6,270,000	6,204,000
Retained Earnings		7,945,000	7,406,000
Accumulated Other Comprehensive Income (Loss)		(102,000)	(103,000)
TOTAL COMMON SHAREHOLDER'S EQUITY		17,434,000	16,820,000
Noncontrolling Interests		8,000	4,000
TOTAL EQUITY		17,442,000	16,824,000
TOTAL LIABILITIES AND EQUITY		60,938,000	59,633,000
Appalachian Power Co [Member]
Current Assets
Cash and Cash Equivalents		2,523	2,613
Restricted Cash for Securitized Funding		15,565	15,599
Advances to Affiliates		23,685	48,519
Accounts Receivable:
Customers		126,488	114,711
Affiliated Companies		54,790	67,294
Accrued Unbilled Revenues		43,102	58,022
Miscellaneous		1,843	1,956
Allowance for Uncollectible Accounts		(3,032)	(2,364)
Total Accounts Receivable		223,191	239,619
Fuel		92,073	113,386
Materials and Supplies		129,521	131,285
Risk Management Assets		38,877	23,792
Deferred Income Tax Benefits		3,491	23,955
Regulatory Asset for Under-Recovered Fuel Costs		83,558	66,076
Prepayments and Other Current Assets		18,122	13,660
TOTAL CURRENT ASSETS		630,606	678,504
Property, Plant and Equipment
Generation		6,215,900	6,824,029
Transmission		2,249,454	2,228,029
Distribution		3,314,816	3,258,306
Other Property, Plant and Equipment		384,861	373,520
Construction Work in Progress		459,307	321,495
Total Property, Plant and Equipment		12,624,338	13,005,379
Accumulated Depreciation and Amortization		3,396,158	3,823,664
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET		9,228,180	9,181,715
Other Noncurrent Assets
Regulatory Assets		1,038,924	857,872
Securitized Assets		339,020	350,170
Long-term Risk Management Assets		3,002	4,891
Deferred Charges and Other Noncurrent Assets		154,587	159,230
TOTAL OTHER NONCURRENT ASSETS		1,535,533	1,372,163
TOTAL ASSETS		11,394,319	11,232,382
Current Liabilities
Advances from Affiliates		57,388	0
Accounts Payable		170,980	166,821
Affiliated Companies		67,380	80,602
Short-term Debt:
Long-term Debt Due Within One Year		252,410	552,212
Long-term Debt Due Within One Year - Affiliated		0	86,000
Risk Management Liabilities		9,159	11,017
Customer Deposits		76,867	71,766
Accrued Taxes		99,682	109,482
Accrued Interest		41,675	52,141
Other Current Liabilities		142,079	145,017
TOTAL CURRENT LIABILITIES		917,620	1,275,058
Noncurrent Liabilities
Long-term Debt		3,714,237	3,342,062
Long-term Risk Management Liabilities		1,448	2,057
Deferred Income Taxes		2,384,223	2,288,842
Regulatory Liabilities and Deferred Investment Tax Credits		661,932	652,867
Asset Retirement Obligations		118,310	122,300
Employee Benefits and Pension Obligations		117,780	127,980
Deferred Credits and Other Noncurrent Liabilities		30,531	54,288
TOTAL NONCURRENT LIABILITIES		7,028,461	6,590,396
TOTAL LIABILITIES		$ 7,946,081	$ 7,865,454
Rate Matters
Commitments and Contingencies
Equity
Common Stock		$ 260,458	$ 260,458
Paid-in Capital		1,809,562	1,809,562
Retained Earnings		1,373,971	1,291,876
Accumulated Other Comprehensive Income (Loss)		4,247	5,032
TOTAL EQUITY		3,448,238	3,366,928
TOTAL LIABILITIES AND EQUITY		11,394,319	11,232,382
Indiana Michigan Power Co [Member]
Current Assets
Cash and Cash Equivalents		1,317	1,020
Advances to Affiliates		13,504	13,481
Accounts Receivable:
Customers		73,208	56,978
Affiliated Companies		59,434	72,582
Accrued Unbilled Revenues		220	503
Miscellaneous		1,561	1,625
Allowance for Uncollectible Accounts		(375)	(494)
Total Accounts Receivable		134,048	131,194
Fuel		23,884	54,623
Materials and Supplies		189,022	201,089
Risk Management Assets		16,514	22,328
Accrued Tax Benefits		28,457	24,788
Prepayments and Other Current Assets		28,566	27,968
TOTAL CURRENT ASSETS		435,312	476,491
Property, Plant and Equipment
Generation		3,931,860	3,741,831
Transmission		1,375,436	1,358,419
Distribution		1,735,290	1,698,409
Other Property, Plant and Equipment		746,227	1,490,820
Construction Work in Progress		437,078	537,237
Total Property, Plant and Equipment		8,225,891	8,826,716
Accumulated Depreciation and Amortization		3,049,243	3,410,341
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET		5,176,648	5,416,375
Other Noncurrent Assets
Regulatory Assets		839,110	536,152
Spent Nuclear Fuel and Decommissioning Trusts		2,106,090	2,095,732
Long-term Risk Management Assets		2,026	3,317
Deferred Charges and Other Noncurrent Assets		127,922	137,209
TOTAL OTHER NONCURRENT ASSETS		3,075,148	2,772,410
TOTAL ASSETS		8,687,108	8,665,276
Current Liabilities
Advances from Affiliates		140,658	142,501
Accounts Payable		117,949	168,294
Affiliated Companies		75,328	76,010
Short-term Debt:
Long-term Debt Due Within One Year		312,370	382,187
Risk Management Liabilities		4,493	5,223
Customer Deposits		35,224	35,206
Accrued Taxes		68,633	72,742
Accrued Interest		26,888	26,677
Obligations Under Capital Leases		42,186	42,050
Other Current Liabilities		112,701	150,566
TOTAL CURRENT LIABILITIES		936,430	1,101,456
Noncurrent Liabilities
Long-term Debt		1,776,543	1,645,210
Long-term Risk Management Liabilities		982	1,395
Deferred Income Taxes		1,332,635	1,264,167
Regulatory Liabilities and Deferred Investment Tax Credits		1,134,679	1,199,694
Asset Retirement Obligations		1,365,572	1,337,179
Deferred Credits and Other Noncurrent Liabilities		122,506	162,226
TOTAL NONCURRENT LIABILITIES		5,732,917	5,609,871
TOTAL LIABILITIES		$ 6,669,347	$ 6,711,327
Rate Matters
Commitments and Contingencies
Equity
Common Stock		$ 56,584	$ 56,584
Paid-in Capital		980,896	980,896
Retained Earnings		994,084	930,829
Accumulated Other Comprehensive Income (Loss)		(13,803)	(14,360)
TOTAL EQUITY		2,017,761	1,953,949
TOTAL LIABILITIES AND EQUITY		8,687,108	8,665,276
Ohio Power Co [Member]
Current Assets
Cash and Cash Equivalents		3,439	2,870
Restricted Cash for Securitized Funding		28,699	28,687
Advances to Affiliates		187,812	312,473
Accounts Receivable:
Customers		45,450	57,906
Affiliated Companies		91,434	79,822
Accrued Unbilled Revenues		803	35,755
Miscellaneous		720	927
Allowance for Uncollectible Accounts		(165)	(171)
Total Accounts Receivable		138,242	174,239
Notes Receivable Due Within One Year - Affiliated		0	86,000
Materials and Supplies		75,595	60,909
Risk Management Assets		0	7,242
Deferred Income Tax Benefits		44,336	49,306
Accrued Tax Benefits		5,699	6,100
Prepayments and Other Current Assets		8,705	8,997
TOTAL CURRENT ASSETS		492,527	736,823
Property, Plant and Equipment
Transmission		2,159,276	2,104,613
Distribution		4,177,897	4,087,601
Other Property, Plant and Equipment		434,887	390,848
Construction Work in Progress		222,943	218,667
Total Property, Plant and Equipment		6,995,003	6,801,729
Accumulated Depreciation and Amortization		2,070,583	2,038,120
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET		4,924,420	4,763,609
Other Noncurrent Assets
Notes Receivable - Affiliated		32,245	32,245
Regulatory Assets		1,237,933	1,318,939
Securitized Assets		97,849	109,999
Long-term Risk Management Assets		44,056	45,102
Deferred Charges and Other Noncurrent Assets		170,043	264,150
TOTAL OTHER NONCURRENT ASSETS		1,582,126	1,770,435
TOTAL ASSETS		6,999,073	7,270,867
Current Liabilities
Accounts Payable		166,189	145,328
Affiliated Companies		85,996	172,741
Short-term Debt:
Long-term Debt Due Within One Year		396,045	131,497
Risk Management Liabilities		2,010	1,943
Customer Deposits		60,038	53,922
Accrued Taxes		320,688	420,772
Accrued Interest		33,242	34,279
Other Current Liabilities		128,328	179,093
TOTAL CURRENT LIABILITIES		1,192,536	1,139,575
Noncurrent Liabilities
Long-term Debt		1,793,114	2,165,626
Long-term Risk Management Liabilities		4,573	3,013
Deferred Income Taxes		1,414,723	1,405,620
Regulatory Liabilities and Deferred Investment Tax Credits		530,224	514,691
Employee Benefits and Pension Obligations		28,498	36,662
Deferred Credits and Other Noncurrent Liabilities		30,262	25,470
TOTAL NONCURRENT LIABILITIES		3,801,394	4,151,082
TOTAL LIABILITIES		$ 4,993,930	$ 5,290,657
Rate Matters
Commitments and Contingencies
Equity
Common Stock		$ 321,201	$ 321,201
Paid-in Capital		838,782	838,782
Retained Earnings		840,244	814,625
Accumulated Other Comprehensive Income (Loss)		4,916	5,602
TOTAL EQUITY		2,005,143	1,980,210
TOTAL LIABILITIES AND EQUITY		6,999,073	7,270,867
Public Service Co Of Oklahoma [Member]
Current Assets
Cash and Cash Equivalents		1,273	1,352
Advances to Affiliates		64,212	0
Accounts Receivable:
Customers		36,527	28,448
Affiliated Companies		22,410	22,114
Miscellaneous		3,549	6,026
Allowance for Uncollectible Accounts		(56)	(147)
Total Accounts Receivable		62,430	56,441
Fuel		14,584	16,436
Materials and Supplies		53,195	50,880
Risk Management Assets		1,731	0
Deferred Income Tax Benefits		5,182	0
Accrued Tax Benefits		27,226	24,369
Regulatory Asset for Under-Recovered Fuel Costs		0	35,699
Prepayments and Other Current Assets		4,802	6,524
TOTAL CURRENT ASSETS		234,635	191,701
Property, Plant and Equipment
Generation		1,292,305	1,264,724
Transmission		798,209	788,911
Distribution		2,162,261	2,080,221
Other Property, Plant and Equipment		432,397	421,568
Construction Work in Progress		244,404	204,753
Total Property, Plant and Equipment		4,929,576	4,760,177
Accumulated Depreciation and Amortization		1,363,314	1,319,554
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET		3,566,262	3,440,623
Other Noncurrent Assets
Regulatory Assets		170,834	154,327
Long-term Risk Management Assets		29	0
Employee Benefits and Pension Assets		20,583	19,335
Deferred Charges and Other Noncurrent Assets		23,711	7,557
TOTAL OTHER NONCURRENT ASSETS		215,157	181,219
TOTAL ASSETS		4,016,054	3,813,543
Current Liabilities
Advances from Affiliates		0	154,249
Accounts Payable		89,073	92,672
Affiliated Companies		55,424	51,744
Short-term Debt:
Long-term Debt Due Within One Year		434	427
Risk Management Liabilities		129	918
Customer Deposits		50,443	48,700
Accrued Taxes		36,266	20,887
Accrued Interest		16,142	12,699
Regulatory Liability for Over-Recovered Fuel Costs		15,894	0
Other Current Liabilities		43,867	58,878
TOTAL CURRENT LIABILITIES		307,672	441,174
Noncurrent Liabilities
Long-term Debt		1,290,561	1,040,609
Deferred Income Taxes		937,651	898,352
Regulatory Liabilities and Deferred Investment Tax Credits		335,164	334,479
Asset Retirement Obligations		41,980	37,030
Employee Benefits and Pension Obligations		15,423	20,095
Deferred Credits and Other Noncurrent Liabilities		18,985	13,589
TOTAL NONCURRENT LIABILITIES		2,639,764	2,344,154
TOTAL LIABILITIES		$ 2,947,436	$ 2,785,328
Rate Matters
Commitments and Contingencies
Equity
Common Stock		$ 157,230	$ 157,230
Paid-in Capital		364,037	364,037
Retained Earnings		542,788	502,005
Accumulated Other Comprehensive Income (Loss)		4,563	4,943
TOTAL EQUITY		1,068,618	1,028,215
TOTAL LIABILITIES AND EQUITY		4,016,054	3,813,543
Southwestern Electric Power Co [Member]
Current Assets
Cash and Cash Equivalents		8,017	14,356
Advances to Affiliates		179,709	41,033
Accounts Receivable:
Customers		72,169	46,738
Affiliated Companies		24,986	37,114
Miscellaneous		26,675	25,625
Allowance for Uncollectible Accounts		(39)	(516)
Total Accounts Receivable		123,791	108,961
Fuel		105,171	116,955
Materials and Supplies		73,297	73,666
Risk Management Assets		2,077	31
Deferred Income Tax Benefits		9,610	9,041
Accrued Tax Benefits		9,423	15,408
Regulatory Asset for Under-Recovered Fuel Costs		19,118	24,024
Prepayments and Other Current Assets		23,912	25,779
TOTAL CURRENT ASSETS		554,125	429,254
Property, Plant and Equipment
Generation		3,927,856	3,864,543
Transmission		1,344,858	1,300,729
Distribution		1,928,523	1,894,572
Other Property, Plant and Equipment		891,788	878,753
Construction Work in Progress		577,984	471,980
Total Property, Plant and Equipment		8,671,009	8,410,577
Accumulated Depreciation and Amortization		2,579,758	2,503,290
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET		6,091,251	5,907,287
Other Noncurrent Assets
Regulatory Assets		417,551	393,602
Long-term Risk Management Assets		33	0
Deferred Charges and Other Noncurrent Assets		120,330	86,750
TOTAL OTHER NONCURRENT ASSETS		537,914	480,352
TOTAL ASSETS		7,183,290	6,816,893
Current Liabilities
Accounts Payable		138,971	175,109
Affiliated Companies		82,129	67,410
Short-term Debt:
Long-term Debt Due Within One Year		153,250	306,750
Risk Management Liabilities		2,523	1,082
Customer Deposits		60,741	59,903
Accrued Taxes		74,559	43,965
Accrued Interest		46,139	44,328
Obligations Under Capital Leases		17,358	17,557
Other Current Liabilities		62,108	104,553
TOTAL CURRENT LIABILITIES		637,778	820,657
Noncurrent Liabilities
Long-term Debt		2,282,228	1,833,687
Deferred Income Taxes		1,397,455	1,351,111
Regulatory Liabilities and Deferred Investment Tax Credits		460,854	458,530
Asset Retirement Obligations		107,688	92,015
Employee Benefits and Pension Obligations		24,496	25,374
Obligations Under Capital Leases		83,245	91,044
Deferred Credits and Other Noncurrent Liabilities		47,634	47,274
TOTAL NONCURRENT LIABILITIES		4,403,600	3,899,035
TOTAL LIABILITIES		$ 5,041,378	$ 4,719,692
Rate Matters
Commitments and Contingencies
Equity
Common Stock		$ 135,660	$ 135,660
Paid-in Capital		674,606	674,606
Retained Earnings		1,338,160	1,293,986
Accumulated Other Comprehensive Income (Loss)		(6,811)	(7,466)
TOTAL COMMON SHAREHOLDER'S EQUITY		2,141,615	2,096,786
Noncontrolling Interests		297	415
TOTAL EQUITY		2,141,912	2,097,201
TOTAL LIABILITIES AND EQUITY		$ 7,183,290	$ 6,816,893

[1] Amount of securitized debt for receivables as accounted for under the ''Transfers and Servicing'' accounting guidance