Variable Interest Entities (Details) $ in Millions |
12 Months Ended |
|
Dec. 31, 2020
USD ($)
MW
|
Dec. 31, 2019
USD ($)
|
Dec. 31, 2018
USD ($)
|
Dec. 31, 2017
USD ($)
|
ASSETS |
|
|
|
|
|
|
|
Current Assets |
|
$ 4,351.5
|
|
$ 4,077.8
|
|
|
|
Net Property, Plant and Equipment |
|
63,901.6
|
|
60,138.1
|
|
|
|
Other Noncurrent Assets |
|
12,504.1
|
|
11,676.4
|
|
|
|
Total Assets |
|
80,757.2
|
|
75,892.3
|
|
$ 68,802.8
|
|
LIABILITIES AND EQUITY |
|
|
|
|
|
|
|
Current Liabilities |
|
9,926.7
|
|
10,299.1
|
|
|
|
Noncurrent Liabilities |
|
50,010.8
|
|
45,571.4
|
|
|
|
Equity |
|
20,774.5
|
|
19,913.2
|
|
19,059.4
|
$ 18,313.6
|
Total Liabilities and Equity |
|
80,757.2
|
|
75,892.3
|
|
|
|
Variable Interest Entities (Textuals) |
|
|
|
|
|
|
|
Securitization Bonds |
|
716.4
|
|
1,025.1
|
|
|
|
Securitized Assets |
|
657.0
|
|
858.1
|
|
|
|
Redeemable Noncontrolling Interest |
|
0.0
|
|
65.7
|
|
|
|
Equity Method Investments |
|
1,406.3
|
|
1,356.6
|
|
|
|
Equity Method Investment Income |
|
91.1
|
|
72.1
|
|
$ 73.1
|
|
Unregulated Operation [Member] |
|
|
|
|
|
|
|
ASSETS |
|
|
|
|
|
|
|
Net Property, Plant and Equipment |
|
1,927.0
|
|
1,757.7
|
|
|
|
Variable Interest Entities (Textuals) |
|
|
|
|
|
|
|
Depreciable Life Ranges - Transmission |
|
|
|
|
|
40 years
|
|
Protected Cell Of Energy Insurance Services, Inc. [Member] |
|
|
|
|
|
|
|
Variable Interest Entities (Textuals) |
|
|
|
|
|
|
|
Insurance Premium Expense to Protected Cell |
|
31.0
|
|
34.0
|
|
$ 34.0
|
|
Protected Cell Of Energy Insurance Services, Inc. [Member] | Variable Interest Entities [Member] |
|
|
|
|
|
|
|
ASSETS |
|
|
|
|
|
|
|
Current Assets |
|
198.1
|
|
194.6
|
|
|
|
Net Property, Plant and Equipment |
|
0.0
|
|
0.0
|
|
|
|
Other Noncurrent Assets |
|
0.0
|
|
0.0
|
|
|
|
Total Assets |
|
198.1
|
|
194.6
|
|
|
|
LIABILITIES AND EQUITY |
|
|
|
|
|
|
|
Current Liabilities |
|
43.1
|
|
40.7
|
|
|
|
Noncurrent Liabilities |
|
62.5
|
|
78.0
|
|
|
|
Equity |
|
92.5
|
|
75.9
|
|
|
|
Total Liabilities and Equity |
|
$ 198.1
|
|
194.6
|
|
|
|
Transource Energy [Member] |
|
|
|
|
|
|
|
Variable Interest Entities (Textuals) |
|
|
|
|
|
|
|
Debt-to-Total Capitalization Maximum |
|
67.50%
|
|
|
|
|
|
Transource Energy [Member] | Variable Interest Entities [Member] |
|
|
|
|
|
|
|
ASSETS |
|
|
|
|
|
|
|
Current Assets |
|
$ 22.2
|
|
25.8
|
|
|
|
Net Property, Plant and Equipment |
|
458.7
|
|
424.1
|
|
|
|
Other Noncurrent Assets |
|
3.7
|
|
3.2
|
|
|
|
Total Assets |
|
484.6
|
|
453.1
|
|
|
|
LIABILITIES AND EQUITY |
|
|
|
|
|
|
|
Current Liabilities |
|
32.6
|
|
192.4
|
|
|
|
Noncurrent Liabilities |
|
185.0
|
|
4.8
|
|
|
|
Equity |
|
267.0
|
|
255.9
|
|
|
|
Total Liabilities and Equity |
|
$ 484.6
|
|
453.1
|
|
|
|
Trent and Desert Sky Wind Farms [Member] |
|
|
|
|
|
|
|
Variable Interest Entities (Textuals) |
|
|
|
|
|
|
|
Non-Affiliate Interest |
|
20.10%
|
|
|
|
|
|
AEP Ownership in LLCs |
|
79.90%
|
|
|
|
|
|
Desert Sky and Trent PPA Period |
|
12 years
|
|
|
|
|
|
Redeemable Noncontrolling Interest |
|
$ 0.0
|
|
66.0
|
|
|
|
Trent and Desert Sky Wind Farms [Member] | Variable Interest Entities [Member] |
|
|
|
|
|
|
|
ASSETS |
|
|
|
|
|
|
|
Current Assets |
|
|
|
7.8
|
|
|
|
Net Property, Plant and Equipment |
|
|
|
330.6
|
|
|
|
Other Noncurrent Assets |
|
|
|
10.1
|
|
|
|
Total Assets |
|
|
|
348.5
|
|
|
|
LIABILITIES AND EQUITY |
|
|
|
|
|
|
|
Current Liabilities |
|
|
|
5.5
|
|
|
|
Noncurrent Liabilities |
|
|
|
15.8
|
|
|
|
Equity |
|
|
|
327.2
|
|
|
|
Total Liabilities and Equity |
|
|
|
348.5
|
|
|
|
Apple Blossom and Black Oak [Member] |
|
|
|
|
|
|
|
Variable Interest Entities (Textuals) |
|
|
|
|
|
|
|
Noncontrolling Interest in Variable Interest Entity |
|
119.0
|
|
128.0
|
|
|
|
HLBV Income for Noncontrolling Interests |
|
6.0
|
|
6.0
|
|
|
|
Apple Blossom and Black Oak [Member] | Variable Interest Entities [Member] |
|
|
|
|
|
|
|
ASSETS |
|
|
|
|
|
|
|
Current Assets |
|
9.6
|
|
10.1
|
|
|
|
Net Property, Plant and Equipment |
|
223.1
|
|
231.4
|
|
|
|
Other Noncurrent Assets |
|
12.1
|
|
13.1
|
|
|
|
Total Assets |
|
244.8
|
|
254.6
|
|
|
|
LIABILITIES AND EQUITY |
|
|
|
|
|
|
|
Current Liabilities |
|
5.3
|
|
5.4
|
|
|
|
Noncurrent Liabilities |
|
4.9
|
|
4.7
|
|
|
|
Equity |
|
234.6
|
|
244.5
|
|
|
|
Total Liabilities and Equity |
|
244.8
|
|
254.6
|
|
|
|
Santa Rita East [Member] |
|
|
|
|
|
|
|
Variable Interest Entities (Textuals) |
|
|
|
|
|
|
|
Noncontrolling Interest in Variable Interest Entity |
|
$ 61.0
|
|
118.0
|
|
|
|
Percentage of an Asset Acquired |
|
85.00%
|
|
|
|
|
|
Production Tax Credits |
|
$ 23.0
|
|
10.0
|
|
|
|
Santa Rita East [Member] | Variable Interest Entities [Member] |
|
|
|
|
|
|
|
ASSETS |
|
|
|
|
|
|
|
Current Assets |
|
6.0
|
|
17.7
|
|
|
|
Net Property, Plant and Equipment |
|
453.1
|
|
465.2
|
|
|
|
Other Noncurrent Assets |
|
0.0
|
|
0.3
|
|
|
|
Total Assets |
|
459.1
|
|
483.2
|
|
|
|
LIABILITIES AND EQUITY |
|
|
|
|
|
|
|
Current Liabilities |
|
3.5
|
|
3.9
|
|
|
|
Noncurrent Liabilities |
|
6.7
|
|
7.5
|
|
|
|
Equity |
|
448.9
|
|
471.8
|
|
|
|
Total Liabilities and Equity |
|
$ 459.1
|
|
483.2
|
|
|
|
Santa Rita East [Member] | Initial Interest Acquired [Member] |
|
|
|
|
|
|
|
Variable Interest Entities (Textuals) |
|
|
|
|
|
|
|
Percentage of an Asset Acquired |
|
75.00%
|
|
|
|
|
|
Santa Rita East [Member] | Additional 10 Percent [Member] |
|
|
|
|
|
|
|
Variable Interest Entities (Textuals) |
|
|
|
|
|
|
|
Percentage of an Asset Acquired |
|
10.00%
|
|
|
|
|
|
AEP Credit, Inc. |
|
|
|
|
|
|
|
Variable Interest Entities (Textuals) |
|
|
|
|
|
|
|
Minimum Percentage of Equity AEP Provides |
|
5.00%
|
|
|
|
|
|
Percentage Of Short Term Borrowing Needs In Excess Of Third Party Financings |
|
25.00%
|
|
|
|
|
|
AEP Credit, Inc. | Variable Interest Entities [Member] |
|
|
|
|
|
|
|
ASSETS |
|
|
|
|
|
|
|
Current Assets |
|
$ 960.4
|
|
842.8
|
|
|
|
Net Property, Plant and Equipment |
|
0.0
|
|
0.0
|
|
|
|
Other Noncurrent Assets |
|
12.9
|
|
7.1
|
|
|
|
Total Assets |
|
973.3
|
|
849.9
|
|
|
|
LIABILITIES AND EQUITY |
|
|
|
|
|
|
|
Current Liabilities |
|
827.2
|
|
805.2
|
|
|
|
Noncurrent Liabilities |
|
0.8
|
|
0.9
|
|
|
|
Equity |
|
145.3
|
|
43.8
|
|
|
|
Total Liabilities and Equity |
|
973.3
|
|
849.9
|
|
|
|
Dolet Hills Lignite Co, LLC [Member] |
|
|
|
|
|
|
|
Variable Interest Entities (Textuals) |
|
|
|
|
|
|
|
Equity Method Investment Income |
|
$ 2.9
|
|
3.0
|
|
2.7
|
|
Ohio Valley Electric Corporation [Member] |
|
|
|
|
|
|
|
Variable Interest Entities (Textuals) |
|
|
|
|
|
|
|
AEP's Ownership In OVEC |
|
43.47%
|
|
|
|
|
|
Approximate OVEC Generating Capacity (MWs) | MW |
|
2,400
|
|
|
|
|
|
Intercompany Power Agreement End Date |
|
2040
|
|
|
|
|
|
Outstanding Indebtedness |
|
$ 1,300.0
|
|
1,400.0
|
|
|
|
Capital Contribution From Parent [Member] | Ohio Valley Electric Corporation [Member] |
|
|
|
|
|
|
|
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures |
|
|
|
|
|
|
|
As Reported on the Balance Sheet |
|
4.4
|
|
4.4
|
|
|
|
Maximum Exposure |
|
4.4
|
|
4.4
|
|
|
|
Retained Earnings [Member] |
|
|
|
|
|
|
|
LIABILITIES AND EQUITY |
|
|
|
|
|
|
|
Equity |
|
10,687.8
|
|
9,900.9
|
|
9,325.3
|
8,626.7
|
AEP's Ratio of OVEC Debt [Member] | Ohio Valley Electric Corporation [Member] |
|
|
|
|
|
|
|
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures |
|
|
|
|
|
|
|
As Reported on the Balance Sheet |
|
0.0
|
|
0.0
|
|
|
|
Maximum Exposure |
[1] |
555.0
|
|
588.9
|
|
|
|
Total Investment [Member] | Ohio Valley Electric Corporation [Member] |
|
|
|
|
|
|
|
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures |
|
|
|
|
|
|
|
As Reported on the Balance Sheet |
|
4.4
|
|
4.4
|
|
|
|
Maximum Exposure |
|
559.4
|
|
593.3
|
|
|
|
Non-Affiliate Contribution [Member] | Trent and Desert Sky Wind Farms [Member] | Variable Interest Entities [Member] |
|
|
|
|
|
|
|
ASSETS |
|
|
|
|
|
|
|
Net Property, Plant and Equipment |
|
$ 84.0
|
|
|
|
|
|
Total Generation MWs [Member] | Santa Rita East [Member] |
|
|
|
|
|
|
|
Variable Interest Entities (Textuals) |
|
|
|
|
|
|
|
WindGenerationMWs | MW |
|
302
|
|
|
|
|
|
Long-term PPA MWs [Member] | Santa Rita East [Member] |
|
|
|
|
|
|
|
Variable Interest Entities (Textuals) |
|
|
|
|
|
|
|
WindGenerationMWs | MW |
|
260
|
|
|
|
|
|
Sold at Wholesale MWs [Member] | Santa Rita East [Member] |
|
|
|
|
|
|
|
Variable Interest Entities (Textuals) |
|
|
|
|
|
|
|
WindGenerationMWs | MW |
|
42
|
|
|
|
|
|
Parent Company [Member] | Ohio Valley Electric Corporation [Member] |
|
|
|
|
|
|
|
Variable Interest Entities (Textuals) |
|
|
|
|
|
|
|
AEP's Ownership In OVEC |
|
39.17%
|
|
|
|
|
|
Great Plains Energy Inc. [Member] | Transource Energy [Member] |
|
|
|
|
|
|
|
Variable Interest Entities (Textuals) |
|
|
|
|
|
|
|
Equity and Voting Ownership Percentage |
|
13.50%
|
|
|
|
|
|
Cleco Power, LLC [Member] |
|
|
|
|
|
|
|
Variable Interest Entities (Textuals) |
|
|
|
|
|
|
|
Percentage of VIE Sales of Lignite Produced |
|
50.00%
|
|
|
|
|
|
AEP Transmission Co [Member] |
|
|
|
|
|
|
|
ASSETS |
|
|
|
|
|
|
|
Current Assets |
|
$ 235.8
|
|
197.4
|
|
|
|
Net Property, Plant and Equipment |
|
10,772.8
|
|
9,490.9
|
|
|
|
Other Noncurrent Assets |
|
237.4
|
|
202.5
|
|
|
|
Total Assets |
|
11,246.0
|
|
9,890.8
|
|
8,394.1
|
|
LIABILITIES AND EQUITY |
|
|
|
|
|
|
|
Current Liabilities |
|
1,137.5
|
|
1,093.1
|
|
|
|
Noncurrent Liabilities |
|
5,395.6
|
|
4,788.2
|
|
|
|
Total Liabilities and Equity |
|
11,246.0
|
|
9,890.8
|
|
|
|
AEP Transmission Co [Member] | Unregulated Operation [Member] |
|
|
|
|
|
|
|
ASSETS |
|
|
|
|
|
|
|
Net Property, Plant and Equipment |
|
0.7
|
|
1.4
|
|
|
|
AEP Transmission Co [Member] | Billings from AEP Service Corporation [Member] |
|
|
|
|
|
|
|
Variable Interest Entities (Textuals) |
|
|
|
|
|
|
|
Billings from VIE |
|
270.3
|
|
242.3
|
|
220.4
|
|
AEP Transmission Co [Member] | Carrying Amount in AEP Service Corporation's Accounts Payable [Member] |
|
|
|
|
|
|
|
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures |
|
|
|
|
|
|
|
As Reported on the Balance Sheet |
|
45.9
|
|
33.4
|
|
|
|
Maximum Exposure |
|
45.9
|
|
33.4
|
|
|
|
Appalachian Power Co [Member] |
|
|
|
|
|
|
|
ASSETS |
|
|
|
|
|
|
|
Current Assets |
|
674.1
|
|
700.6
|
|
|
|
Net Property, Plant and Equipment |
|
11,394.1
|
|
11,081.9
|
|
|
|
Other Noncurrent Assets |
|
1,247.0
|
|
985.8
|
|
|
|
Total Assets |
|
13,315.2
|
|
12,768.3
|
|
|
|
LIABILITIES AND EQUITY |
|
|
|
|
|
|
|
Current Liabilities |
|
1,217.7
|
|
1,226.0
|
|
|
|
Noncurrent Liabilities |
|
7,753.2
|
|
7,369.9
|
|
|
|
Equity |
|
4,344.3
|
|
4,172.4
|
|
4,006.1
|
3,804.5
|
Total Liabilities and Equity |
|
13,315.2
|
|
12,768.3
|
|
|
|
Variable Interest Entities (Textuals) |
|
|
|
|
|
|
|
Securitization Bonds |
|
223.8
|
|
248.3
|
|
|
|
Securitized Assets |
|
210.1
|
|
234.7
|
|
|
|
Amount Of Power Purchased From OVEC |
|
94.4
|
|
104.5
|
|
100.4
|
|
Appalachian Power Co [Member] | Unregulated Operation [Member] |
|
|
|
|
|
|
|
ASSETS |
|
|
|
|
|
|
|
Net Property, Plant and Equipment |
|
24.0
|
|
22.6
|
|
|
|
Appalachian Power Co [Member] | Appalachian Consumer Rate Relief Funding [Member] |
|
|
|
|
|
|
|
Variable Interest Entities (Textuals) |
|
|
|
|
|
|
|
Securitized Assets |
|
210.0
|
|
235.0
|
|
|
|
Appalachian Power Co [Member] | Appalachian Consumer Rate Relief Funding [Member] | Variable Interest Entities [Member] |
|
|
|
|
|
|
|
ASSETS |
|
|
|
|
|
|
|
Current Assets |
|
16.8
|
|
21.5
|
|
|
|
Net Property, Plant and Equipment |
|
0.0
|
|
0.0
|
|
|
|
Other Noncurrent Assets |
|
212.7
|
[2] |
237.5
|
[3] |
|
|
Total Assets |
|
229.5
|
|
259.0
|
|
|
|
LIABILITIES AND EQUITY |
|
|
|
|
|
|
|
Current Liabilities |
|
28.7
|
|
28.3
|
|
|
|
Noncurrent Liabilities |
|
198.9
|
|
228.8
|
|
|
|
Equity |
|
1.9
|
|
1.9
|
|
|
|
Total Liabilities and Equity |
|
$ 229.5
|
|
259.0
|
|
|
|
Appalachian Power Co [Member] | Ohio Valley Electric Corporation [Member] |
|
|
|
|
|
|
|
Variable Interest Entities (Textuals) |
|
|
|
|
|
|
|
Power Participation Ratio |
|
15.69%
|
|
|
|
|
|
Outstanding Indebtedness |
|
$ 200.0
|
|
213.0
|
|
|
|
Appalachian Power Co [Member] | Billings from AEP Service Corporation [Member] |
|
|
|
|
|
|
|
Variable Interest Entities (Textuals) |
|
|
|
|
|
|
|
Billings from VIE |
|
294.9
|
|
308.3
|
|
295.6
|
|
Appalachian Power Co [Member] | Carrying Amount in AEP Service Corporation's Accounts Payable [Member] |
|
|
|
|
|
|
|
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures |
|
|
|
|
|
|
|
As Reported on the Balance Sheet |
|
42.8
|
|
44.1
|
|
|
|
Maximum Exposure |
|
42.8
|
|
44.1
|
|
|
|
Appalachian Power Co [Member] | Retained Earnings [Member] |
|
|
|
|
|
|
|
LIABILITIES AND EQUITY |
|
|
|
|
|
|
|
Equity |
|
2,248.0
|
|
2,078.3
|
|
1,922.0
|
1,714.1
|
Appalachian Power Co [Member] | Other Noncurrent Assets [Member] | Appalachian Consumer Rate Relief Funding [Member] |
|
|
|
|
|
|
|
Variable Interest Entities (Textuals) |
|
|
|
|
|
|
|
Intercompany Item Eliminated in Consolidation |
|
3.0
|
|
3.0
|
|
|
|
Appalachian Power Co [Member] | Current Liabilities [Member] | Appalachian Consumer Rate Relief Funding [Member] |
|
|
|
|
|
|
|
Variable Interest Entities (Textuals) |
|
|
|
|
|
|
|
Securitization Bonds |
|
25.0
|
|
25.0
|
|
|
|
Appalachian Power Co [Member] | Noncurrent Liabilities [Member] | Appalachian Consumer Rate Relief Funding [Member] |
|
|
|
|
|
|
|
Variable Interest Entities (Textuals) |
|
|
|
|
|
|
|
Securitization Bonds |
|
199.0
|
|
223.0
|
|
|
|
Indiana Michigan Power Co [Member] |
|
|
|
|
|
|
|
ASSETS |
|
|
|
|
|
|
|
Current Assets |
|
418.8
|
|
403.0
|
|
|
|
Net Property, Plant and Equipment |
|
7,052.3
|
|
6,899.7
|
|
|
|
Other Noncurrent Assets |
|
4,167.2
|
|
3,934.7
|
|
|
|
Total Assets |
|
11,638.3
|
|
11,237.4
|
|
|
|
LIABILITIES AND EQUITY |
|
|
|
|
|
|
|
Current Liabilities |
|
1,104.5
|
|
883.4
|
|
|
|
Noncurrent Liabilities |
|
7,784.6
|
|
7,809.6
|
|
|
|
Equity |
|
2,749.2
|
|
2,544.4
|
|
2,352.8
|
2,217.6
|
Total Liabilities and Equity |
|
11,638.3
|
|
11,237.4
|
|
|
|
Variable Interest Entities (Textuals) |
|
|
|
|
|
|
|
Amount Of Power Purchased From OVEC |
|
47.2
|
|
52.3
|
|
50.2
|
|
Indiana Michigan Power Co [Member] | Unregulated Operation [Member] |
|
|
|
|
|
|
|
ASSETS |
|
|
|
|
|
|
|
Net Property, Plant and Equipment |
|
28.2
|
|
28.8
|
|
|
|
Indiana Michigan Power Co [Member] | DCC Fuel [Member] |
|
|
|
|
|
|
|
Variable Interest Entities (Textuals) |
|
|
|
|
|
|
|
Payments Made by I&M to DCC Fuel |
|
94.0
|
|
95.0
|
|
113.0
|
|
Indiana Michigan Power Co [Member] | DCC Fuel [Member] | Variable Interest Entities [Member] |
|
|
|
|
|
|
|
ASSETS |
|
|
|
|
|
|
|
Current Assets |
|
76.1
|
|
86.5
|
|
|
|
Net Property, Plant and Equipment |
|
138.9
|
|
156.8
|
|
|
|
Other Noncurrent Assets |
|
70.9
|
|
82.5
|
|
|
|
Total Assets |
|
285.9
|
|
325.8
|
|
|
|
LIABILITIES AND EQUITY |
|
|
|
|
|
|
|
Current Liabilities |
|
76.0
|
|
86.4
|
|
|
|
Noncurrent Liabilities |
|
209.9
|
|
239.4
|
|
|
|
Equity |
|
0.0
|
|
0.0
|
|
|
|
Total Liabilities and Equity |
|
$ 285.9
|
|
325.8
|
|
|
|
Indiana Michigan Power Co [Member] | Ohio Valley Electric Corporation [Member] |
|
|
|
|
|
|
|
Variable Interest Entities (Textuals) |
|
|
|
|
|
|
|
Power Participation Ratio |
|
7.85%
|
|
|
|
|
|
Outstanding Indebtedness |
|
$ 100.0
|
|
106.0
|
|
|
|
Indiana Michigan Power Co [Member] | Billings from AEP Service Corporation [Member] |
|
|
|
|
|
|
|
Variable Interest Entities (Textuals) |
|
|
|
|
|
|
|
Billings from VIE |
|
210.2
|
|
184.8
|
|
173.5
|
|
Indiana Michigan Power Co [Member] | Carrying Amount in AEP Service Corporation's Accounts Payable [Member] |
|
|
|
|
|
|
|
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures |
|
|
|
|
|
|
|
As Reported on the Balance Sheet |
|
27.1
|
|
28.6
|
|
|
|
Maximum Exposure |
|
27.1
|
|
28.6
|
|
|
|
Indiana Michigan Power Co [Member] | Billings from AEP Generating Company [Member] |
|
|
|
|
|
|
|
Variable Interest Entities (Textuals) |
|
|
|
|
|
|
|
Billings from VIE |
|
173.0
|
|
215.0
|
|
238.0
|
|
Indiana Michigan Power Co [Member] | Carrying Amount in AEP Generating Company's Accounts Payable [Member] |
|
|
|
|
|
|
|
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures |
|
|
|
|
|
|
|
As Reported on the Balance Sheet |
|
$ 9.0
|
|
10.0
|
|
|
|
Indiana Michigan Power Co [Member] | Rockport Generating Plant (Unit No. 1) [Member] |
|
|
|
|
|
|
|
Variable Interest Entities (Textuals) |
|
|
|
|
|
|
|
Jointly Owned Utility Plant, Proportionate Ownership Share |
|
50.00%
|
|
|
|
|
|
Indiana Michigan Power Co [Member] | Retained Earnings [Member] |
|
|
|
|
|
|
|
LIABILITIES AND EQUITY |
|
|
|
|
|
|
|
Equity |
|
$ 1,718.7
|
|
1,518.5
|
|
1,329.1
|
1,192.2
|
Ohio Power Co [Member] |
|
|
|
|
|
|
|
ASSETS |
|
|
|
|
|
|
|
Current Assets |
|
256.3
|
|
238.5
|
|
|
|
Net Property, Plant and Equipment |
|
7,452.1
|
|
6,907.0
|
|
|
|
Other Noncurrent Assets |
|
1,002.0
|
|
898.1
|
|
|
|
Total Assets |
|
8,710.4
|
|
8,043.6
|
|
|
|
LIABILITIES AND EQUITY |
|
|
|
|
|
|
|
Current Liabilities |
|
1,906.2
|
|
1,297.9
|
|
|
|
Noncurrent Liabilities |
|
4,111.5
|
|
4,237.2
|
|
|
|
Equity |
|
2,692.7
|
|
2,508.5
|
|
2,297.4
|
2,310.3
|
Total Liabilities and Equity |
|
8,710.4
|
|
8,043.6
|
|
|
|
Variable Interest Entities (Textuals) |
|
|
|
|
|
|
|
Amount Of Power Purchased From OVEC |
|
120.8
|
|
132.7
|
|
127.5
|
|
Ohio Power Co [Member] | Unregulated Operation [Member] |
|
|
|
|
|
|
|
ASSETS |
|
|
|
|
|
|
|
Net Property, Plant and Equipment |
|
$ 9.9
|
|
9.8
|
|
|
|
Ohio Power Co [Member] | Ohio Valley Electric Corporation [Member] |
|
|
|
|
|
|
|
Variable Interest Entities (Textuals) |
|
|
|
|
|
|
|
AEP's Ownership In OVEC |
|
4.30%
|
|
|
|
|
|
Power Participation Ratio |
|
19.93%
|
|
|
|
|
|
Outstanding Indebtedness |
|
$ 255.0
|
|
270.0
|
|
|
|
Ohio Power Co [Member] | Billings from AEP Service Corporation [Member] |
|
|
|
|
|
|
|
Variable Interest Entities (Textuals) |
|
|
|
|
|
|
|
Billings from VIE |
|
232.8
|
|
230.4
|
|
214.9
|
|
Ohio Power Co [Member] | Carrying Amount in AEP Service Corporation's Accounts Payable [Member] |
|
|
|
|
|
|
|
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures |
|
|
|
|
|
|
|
As Reported on the Balance Sheet |
|
33.9
|
|
33.2
|
|
|
|
Maximum Exposure |
|
33.9
|
|
33.2
|
|
|
|
Ohio Power Co [Member] | Retained Earnings [Member] |
|
|
|
|
|
|
|
LIABILITIES AND EQUITY |
|
|
|
|
|
|
|
Equity |
|
1,532.7
|
|
1,348.5
|
|
1,136.4
|
1,148.4
|
Public Service Co Of Oklahoma [Member] |
|
|
|
|
|
|
|
ASSETS |
|
|
|
|
|
|
|
Current Assets |
|
181.3
|
|
188.2
|
|
|
|
Net Property, Plant and Equipment |
|
4,320.0
|
|
4,103.3
|
|
|
|
Other Noncurrent Assets |
|
489.4
|
|
460.0
|
|
|
|
Total Assets |
|
4,990.7
|
|
4,751.5
|
|
|
|
LIABILITIES AND EQUITY |
|
|
|
|
|
|
|
Current Liabilities |
|
478.6
|
|
445.8
|
|
|
|
Noncurrent Liabilities |
|
2,966.5
|
|
2,932.4
|
|
|
|
Equity |
|
1,545.6
|
|
1,373.3
|
|
1,248.0
|
1,215.3
|
Total Liabilities and Equity |
|
4,990.7
|
|
4,751.5
|
|
|
|
Public Service Co Of Oklahoma [Member] | Unregulated Operation [Member] |
|
|
|
|
|
|
|
ASSETS |
|
|
|
|
|
|
|
Net Property, Plant and Equipment |
|
6.9
|
|
4.7
|
|
|
|
Public Service Co Of Oklahoma [Member] | Billings from AEP Service Corporation [Member] |
|
|
|
|
|
|
|
Variable Interest Entities (Textuals) |
|
|
|
|
|
|
|
Billings from VIE |
|
113.2
|
|
125.7
|
|
121.5
|
|
Public Service Co Of Oklahoma [Member] | Carrying Amount in AEP Service Corporation's Accounts Payable [Member] |
|
|
|
|
|
|
|
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures |
|
|
|
|
|
|
|
As Reported on the Balance Sheet |
|
15.7
|
|
18.1
|
|
|
|
Maximum Exposure |
|
15.7
|
|
18.1
|
|
|
|
Public Service Co Of Oklahoma [Member] | Retained Earnings [Member] |
|
|
|
|
|
|
|
LIABILITIES AND EQUITY |
|
|
|
|
|
|
|
Equity |
|
974.3
|
|
851.0
|
|
724.7
|
691.5
|
Southwestern Electric Power Co [Member] |
|
|
|
|
|
|
|
ASSETS |
|
|
|
|
|
|
|
Current Assets |
|
428.0
|
|
354.1
|
|
|
|
Net Property, Plant and Equipment |
|
7,088.2
|
|
7,095.2
|
|
|
|
Other Noncurrent Assets |
|
637.9
|
|
382.9
|
|
|
|
Total Assets |
|
8,154.1
|
|
7,832.2
|
|
|
|
LIABILITIES AND EQUITY |
|
|
|
|
|
|
|
Current Liabilities |
|
763.6
|
|
674.7
|
|
|
|
Noncurrent Liabilities |
|
4,762.8
|
|
4,716.4
|
|
|
|
Equity |
|
2,627.7
|
|
2,441.1
|
|
2,315.6
|
2,234.5
|
Total Liabilities and Equity |
|
8,154.1
|
|
7,832.2
|
|
|
|
Variable Interest Entities (Textuals) |
|
|
|
|
|
|
|
Equity Method Investment Income |
|
2.9
|
|
3.0
|
|
2.7
|
|
Southwestern Electric Power Co [Member] | Unregulated Operation [Member] |
|
|
|
|
|
|
|
ASSETS |
|
|
|
|
|
|
|
Net Property, Plant and Equipment |
|
97.8
|
|
112.1
|
|
|
|
Southwestern Electric Power Co [Member] | Sabine Mining Co [Member] |
|
|
|
|
|
|
|
Variable Interest Entities (Textuals) |
|
|
|
|
|
|
|
Billings from VIE |
|
131.0
|
|
110.0
|
|
152.0
|
|
Guarantees Of Mine Reclamation Amount |
|
155.0
|
|
|
|
|
|
Estimated Final Cost Mine Reclamation |
|
104.0
|
|
|
|
|
|
Amount Collected, Rider Mine Close Other Assets Noncurrent |
|
8.0
|
|
|
|
|
|
Amount Collected Through Rider For Final Mine Closure And Reclamation Costs |
|
81.0
|
|
|
|
|
|
Amount Collected, Rider Mine Close ARO Noncurrent |
|
89.0
|
|
|
|
|
|
Southwestern Electric Power Co [Member] | Sabine Mining Co [Member] | Variable Interest Entities [Member] |
|
|
|
|
|
|
|
ASSETS |
|
|
|
|
|
|
|
Current Assets |
|
88.0
|
|
80.0
|
|
|
|
Net Property, Plant and Equipment |
|
97.3
|
|
111.6
|
|
|
|
Other Noncurrent Assets |
|
99.3
|
|
93.2
|
|
|
|
Total Assets |
|
284.6
|
|
284.8
|
|
|
|
LIABILITIES AND EQUITY |
|
|
|
|
|
|
|
Current Liabilities |
|
57.7
|
|
50.6
|
|
|
|
Noncurrent Liabilities |
|
225.3
|
|
233.6
|
|
|
|
Equity |
|
1.6
|
|
0.6
|
|
|
|
Total Liabilities and Equity |
|
284.6
|
|
284.8
|
|
|
|
Southwestern Electric Power Co [Member] | Dolet Hills Lignite Co, LLC [Member] |
|
|
|
|
|
|
|
Variable Interest Entities (Textuals) |
|
|
|
|
|
|
|
Billings from VIE |
|
$ 142.0
|
|
55.0
|
|
58.0
|
|
Percentage of VIE Sales of Lignite Produced |
|
50.00%
|
|
|
|
|
|
Percentage of DHLCs Debt Guaranteed by Each SWEPCo and CLECO |
|
50.00%
|
|
|
|
|
|
Percentage of Management Fee Received by SWEPCo from DHLC |
|
100.00%
|
|
|
|
|
|
Equity Method Investment Income |
|
$ 2.9
|
|
3.0
|
|
2.7
|
|
Southwestern Electric Power Co [Member] | Billings from AEP Service Corporation [Member] |
|
|
|
|
|
|
|
Variable Interest Entities (Textuals) |
|
|
|
|
|
|
|
Billings from VIE |
|
161.8
|
|
169.5
|
|
164.4
|
|
Southwestern Electric Power Co [Member] | Carrying Amount in AEP Service Corporation's Accounts Payable [Member] |
|
|
|
|
|
|
|
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures |
|
|
|
|
|
|
|
As Reported on the Balance Sheet |
|
22.0
|
|
23.4
|
|
|
|
Maximum Exposure |
|
22.0
|
|
23.4
|
|
|
|
Southwestern Electric Power Co [Member] | Capital Contribution From Parent [Member] | Dolet Hills Lignite Co, LLC [Member] |
|
|
|
|
|
|
|
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures |
|
|
|
|
|
|
|
As Reported on the Balance Sheet |
|
7.6
|
|
7.6
|
|
|
|
Maximum Exposure |
|
7.6
|
|
7.6
|
|
|
|
Southwestern Electric Power Co [Member] | Retained Earnings [Member] |
|
|
|
|
|
|
|
LIABILITIES AND EQUITY |
|
|
|
|
|
|
|
Equity |
|
1,811.9
|
|
1,629.5
|
|
1,508.4
|
1,426.6
|
Southwestern Electric Power Co [Member] | Retained Earnings [Member] | Dolet Hills Lignite Co, LLC [Member] |
|
|
|
|
|
|
|
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures |
|
|
|
|
|
|
|
As Reported on the Balance Sheet |
|
20.4
|
|
17.5
|
|
|
|
Maximum Exposure |
|
20.4
|
|
17.5
|
|
|
|
Southwestern Electric Power Co [Member] | SWEPCo's Share of Obligations [Member] | Dolet Hills Lignite Co, LLC [Member] |
|
|
|
|
|
|
|
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures |
|
|
|
|
|
|
|
As Reported on the Balance Sheet |
|
0.0
|
|
0.0
|
|
|
|
Maximum Exposure |
|
98.5
|
|
130.0
|
|
|
|
Southwestern Electric Power Co [Member] | Total Investment [Member] | Dolet Hills Lignite Co, LLC [Member] |
|
|
|
|
|
|
|
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures |
|
|
|
|
|
|
|
As Reported on the Balance Sheet |
|
28.0
|
|
25.1
|
|
|
|
Maximum Exposure |
|
$ 126.5
|
|
155.1
|
|
|
|
AEP Generating Co [Member] | Rockport Generating Plant (Unit No. 1) [Member] |
|
|
|
|
|
|
|
Variable Interest Entities (Textuals) |
|
|
|
|
|
|
|
Jointly Owned Utility Plant, Proportionate Ownership Share |
|
50.00%
|
|
|
|
|
|
AEP Generating Co [Member] | Rockport Generating Plant (Unit No. 2) [Member] |
|
|
|
|
|
|
|
Variable Interest Entities (Textuals) |
|
|
|
|
|
|
|
Percentage Interest in Lease |
|
50.00%
|
|
|
|
|
|
Transource Energy [Member] |
|
|
|
|
|
|
|
Variable Interest Entities (Textuals) |
|
|
|
|
|
|
|
Equity and Voting Ownership Percentage |
|
86.50%
|
|
|
|
|
|
AEP Texas Inc. [Member] |
|
|
|
|
|
|
|
ASSETS |
|
|
|
|
|
|
|
Current Assets |
|
$ 310.9
|
|
692.9
|
|
|
|
Net Property, Plant and Equipment |
|
9,813.6
|
|
8,845.1
|
|
|
|
Other Noncurrent Assets |
|
905.7
|
|
1,051.1
|
|
|
|
Total Assets |
|
11,030.2
|
|
10,589.1
|
|
|
|
LIABILITIES AND EQUITY |
|
|
|
|
|
|
|
Current Liabilities |
|
676.8
|
|
1,027.2
|
|
|
|
Noncurrent Liabilities |
|
7,147.4
|
|
6,600.8
|
|
|
|
Equity |
|
3,206.0
|
|
2,961.1
|
|
2,580.5
|
2,169.9
|
Total Liabilities and Equity |
|
11,030.2
|
|
10,589.1
|
|
|
|
Variable Interest Entities (Textuals) |
|
|
|
|
|
|
|
Securitization Bonds |
|
492.6
|
|
776.8
|
|
|
|
Securitized Assets |
|
$ 446.8
|
|
623.4
|
|
|
|
Jointly Owned Utility Plant, Proportionate Ownership Share |
|
54.69%
|
|
|
|
|
|
Accumulated Provisions For Rate Refunds |
|
$ 20.1
|
|
64.7
|
|
|
|
AEP Texas Inc. [Member] | Unregulated Operation [Member] |
|
|
|
|
|
|
|
ASSETS |
|
|
|
|
|
|
|
Net Property, Plant and Equipment |
|
1.2
|
|
61.1
|
|
|
|
AEP Texas Inc. [Member] | AEP Texas Central Transition Funding Co [Member] |
|
|
|
|
|
|
|
Variable Interest Entities (Textuals) |
|
|
|
|
|
|
|
Securitized Assets |
|
242.0
|
|
389.0
|
|
|
|
AEP Texas Inc. [Member] | AEP Texas Central Transition Funding Co [Member] | Variable Interest Entities [Member] |
|
|
|
|
|
|
|
ASSETS |
|
|
|
|
|
|
|
Current Assets |
|
61.2
|
|
187.0
|
|
|
|
Net Property, Plant and Equipment |
|
0.0
|
|
0.0
|
|
|
|
Other Noncurrent Assets |
|
273.9
|
[4] |
428.1
|
[5] |
|
|
Total Assets |
|
335.1
|
|
615.1
|
|
|
|
LIABILITIES AND EQUITY |
|
|
|
|
|
|
|
Current Liabilities |
|
69.8
|
|
280.2
|
|
|
|
Noncurrent Liabilities |
|
246.5
|
|
316.3
|
|
|
|
Equity |
|
18.8
|
|
18.6
|
|
|
|
Total Liabilities and Equity |
|
335.1
|
|
615.1
|
|
|
|
AEP Texas Inc. [Member] | Restoration Funding [Member] |
|
|
|
|
|
|
|
Variable Interest Entities (Textuals) |
|
|
|
|
|
|
|
Securitized Assets |
|
205.0
|
|
232.0
|
|
|
|
AEP Texas Inc. [Member] | Restoration Funding [Member] | Variable Interest Entities [Member] |
|
|
|
|
|
|
|
ASSETS |
|
|
|
|
|
|
|
Current Assets |
|
23.3
|
|
9.4
|
|
|
|
Net Property, Plant and Equipment |
|
0.0
|
|
0.0
|
|
|
|
Other Noncurrent Assets |
|
214.9
|
[6] |
234.4
|
[7] |
|
|
Total Assets |
|
238.2
|
|
243.8
|
|
|
|
LIABILITIES AND EQUITY |
|
|
|
|
|
|
|
Current Liabilities |
|
33.9
|
|
16.3
|
|
|
|
Noncurrent Liabilities |
|
203.1
|
|
226.3
|
|
|
|
Equity |
|
1.2
|
|
1.2
|
|
|
|
Total Liabilities and Equity |
|
238.2
|
|
243.8
|
|
|
|
AEP Texas Inc. [Member] | Billings from AEP Service Corporation [Member] |
|
|
|
|
|
|
|
Variable Interest Entities (Textuals) |
|
|
|
|
|
|
|
Billings from VIE |
|
199.4
|
|
206.6
|
|
184.3
|
|
AEP Texas Inc. [Member] | Carrying Amount in AEP Service Corporation's Accounts Payable [Member] |
|
|
|
|
|
|
|
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures |
|
|
|
|
|
|
|
As Reported on the Balance Sheet |
|
30.5
|
|
32.4
|
|
|
|
Maximum Exposure |
|
30.5
|
|
32.4
|
|
|
|
AEP Texas Inc. [Member] | Retained Earnings [Member] |
|
|
|
|
|
|
|
LIABILITIES AND EQUITY |
|
|
|
|
|
|
|
Equity |
|
1,757.0
|
|
1,516.0
|
|
1,337.7
|
$ 1,124.6
|
AEP Texas Inc. [Member] | Other Noncurrent Assets [Member] | AEP Texas Central Transition Funding Co [Member] |
|
|
|
|
|
|
|
Variable Interest Entities (Textuals) |
|
|
|
|
|
|
|
Intercompany Item Eliminated in Consolidation |
|
32.0
|
|
39.0
|
|
|
|
AEP Texas Inc. [Member] | Other Noncurrent Assets [Member] | Restoration Funding [Member] |
|
|
|
|
|
|
|
Variable Interest Entities (Textuals) |
|
|
|
|
|
|
|
Intercompany Item Eliminated in Consolidation |
|
9.0
|
|
1.0
|
|
|
|
AEP Texas Inc. [Member] | Current Liabilities [Member] | AEP Texas Central Transition Funding Co [Member] |
|
|
|
|
|
|
|
Variable Interest Entities (Textuals) |
|
|
|
|
|
|
|
Securitization Bonds |
|
66.0
|
|
267.0
|
|
|
|
AEP Texas Inc. [Member] | Current Liabilities [Member] | Restoration Funding [Member] |
|
|
|
|
|
|
|
Variable Interest Entities (Textuals) |
|
|
|
|
|
|
|
Securitization Bonds |
|
23.0
|
|
14.0
|
|
|
|
AEP Texas Inc. [Member] | Noncurrent Liabilities [Member] | AEP Texas Central Transition Funding Co [Member] |
|
|
|
|
|
|
|
Variable Interest Entities (Textuals) |
|
|
|
|
|
|
|
Securitization Bonds |
|
209.0
|
|
274.0
|
|
|
|
AEP Texas Inc. [Member] | Noncurrent Liabilities [Member] | Restoration Funding [Member] |
|
|
|
|
|
|
|
Variable Interest Entities (Textuals) |
|
|
|
|
|
|
|
Securitization Bonds |
|
$ 195.0
|
|
221.0
|
|
|
|
Joint Venture Wind Farms [Member] |
|
|
|
|
|
|
|
Variable Interest Entities (Textuals) |
|
|
|
|
|
|
|
Equity Method Investment, Ownership Percentage |
|
50.00%
|
|
|
|
|
|
Production Tax Credits |
|
$ 36.0
|
|
27.0
|
|
|
|
Equity Method Investments |
|
376.0
|
|
394.0
|
|
|
|
Historical Investment Balance |
|
399.0
|
|
|
|
|
|
Historical Investment Basis Difference |
|
(12.0)
|
|
|
|
|
|
Equity Method Investment Income |
|
$ 2.0
|
|
4.0
|
|
|
|
Berkshire Hathaway [Member] |
|
|
|
|
|
|
|
Variable Interest Entities (Textuals) |
|
|
|
|
|
|
|
Equity Method Investment, Ownership Percentage |
|
50.00%
|
|
|
|
|
|
AEP Transmission Holdco [Member] |
|
|
|
|
|
|
|
Variable Interest Entities (Textuals) |
|
|
|
|
|
|
|
Equity Method Investment, Ownership Percentage |
|
50.00%
|
|
|
|
|
|
BP Wind Energy [Member] |
|
|
|
|
|
|
|
Variable Interest Entities (Textuals) |
|
|
|
|
|
|
|
Equity Method Investment, Ownership Percentage |
|
50.00%
|
|
|
|
|
|
ETT [Member] |
|
|
|
|
|
|
|
Variable Interest Entities (Textuals) |
|
|
|
|
|
|
|
Equity Method Investments |
|
$ 732.0
|
|
695.0
|
|
|
|
Equity Method Investment Income |
|
$ 68.0
|
|
$ 66.0
|
|
$ 62.0
|
|
|
|