Effects of Regulation (Details) - USD ($) $ in Millions |
12 Months Ended |
Dec. 31, 2021 |
Dec. 31, 2020 |
Dec. 31, 2019 |
Regulated Generating Unit to be Retired |
|
|
|
|
|
|
Net Investment |
|
$ 66,001.3
|
[1] |
$ 63,901.6
|
|
|
Materials and Supplies |
|
681.3
|
|
680.6
|
|
|
Annual Depreciation |
|
2,717.1
|
|
2,487.5
|
|
$ 2,203.7
|
Regulatory Assets |
|
|
|
|
|
|
Current Regulatory Assets |
|
647.8
|
[2] |
90.7
|
|
|
Noncurrent Regulatory Assets |
|
4,142.3
|
[2] |
3,527.0
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Current Regulatory Liabilities |
|
1.5
|
[3] |
52.6
|
|
|
Noncurrent Regulatory Liabilities |
|
8,686.3
|
[3] |
8,378.7
|
|
|
Effects of Regulation Textuals [Abstract] |
|
|
|
|
|
|
Revisions in Cash Flow Estimates |
[5],[6],[7],[8],[9] |
138.6
|
[4] |
183.1
|
|
|
Secured Debt |
|
603.5
|
|
716.4
|
|
|
Accumulated Depreciation and Amortization |
|
20,805.1
|
|
20,411.4
|
|
|
Asset Impairments and Other Related Charges |
|
11.6
|
|
0.0
|
|
156.4
|
Assets Held for Sale |
|
2,919.7
|
|
0.0
|
|
|
Liabilities Held for Sale |
|
1,880.9
|
|
0.0
|
|
|
AEP Texas Inc. [Member] |
|
|
|
|
|
|
Regulated Generating Unit to be Retired |
|
|
|
|
|
|
Net Investment |
|
10,635.4
|
|
9,813.6
|
|
|
Materials and Supplies |
|
73.9
|
|
70.0
|
|
|
Annual Depreciation |
|
327.2
|
|
364.2
|
|
365.9
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
275.2
|
|
266.8
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
1,242.0
|
|
1,270.8
|
|
|
Effects of Regulation Textuals [Abstract] |
|
|
|
|
|
|
Revisions in Cash Flow Estimates |
[6],[7],[9] |
0.0
|
|
(16.8)
|
|
|
Secured Debt |
|
404.7
|
|
492.6
|
|
|
Accumulated Depreciation and Amortization |
|
1,644.1
|
|
1,529.3
|
|
|
Asset Impairments and Other Related Charges |
|
0.0
|
|
0.0
|
|
32.5
|
AEP Transmission Co [Member] |
|
|
|
|
|
|
Regulated Generating Unit to be Retired |
|
|
|
|
|
|
Net Investment |
|
11,935.7
|
[1] |
10,772.8
|
|
|
Materials and Supplies |
|
9.3
|
|
8.5
|
|
|
Annual Depreciation |
|
297.3
|
|
249.0
|
|
176.0
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
8.5
|
|
15.1
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
644.1
|
[10] |
581.8
|
|
|
Effects of Regulation Textuals [Abstract] |
|
|
|
|
|
|
Accumulated Depreciation and Amortization |
|
772.8
|
|
572.8
|
|
|
Assets Held for Sale |
|
167.9
|
|
0.0
|
|
|
Liabilities Held for Sale |
|
27.6
|
|
0.0
|
|
|
Appalachian Power Co [Member] |
|
|
|
|
|
|
Regulated Generating Unit to be Retired |
|
|
|
|
|
|
Net Investment |
|
11,804.3
|
|
11,394.1
|
|
|
Materials and Supplies |
|
109.8
|
|
99.6
|
|
|
Annual Depreciation |
|
547.0
|
|
507.8
|
|
466.5
|
Regulatory Assets |
|
|
|
|
|
|
Current Regulatory Assets |
|
201.3
|
|
5.3
|
|
|
Noncurrent Regulatory Assets |
|
757.6
|
|
686.3
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
1,238.8
|
|
1,224.7
|
|
|
Effects of Regulation Textuals [Abstract] |
|
|
|
|
|
|
Revisions in Cash Flow Estimates |
[6],[7],[9] |
84.7
|
|
200.9
|
|
|
Secured Debt |
|
198.8
|
|
223.8
|
|
|
Accumulated Depreciation and Amortization |
|
5,051.8
|
|
4,716.2
|
|
|
Asset Impairments and Other Related Charges |
|
0.0
|
|
0.0
|
|
92.9
|
Indiana Michigan Power Co [Member] |
|
|
|
|
|
|
Regulated Generating Unit to be Retired |
|
|
|
|
|
|
Net Investment |
|
7,310.9
|
|
7,052.3
|
|
|
Materials and Supplies |
|
175.2
|
|
175.8
|
|
|
Annual Depreciation |
|
424.9
|
|
393.3
|
|
330.6
|
Regulatory Assets |
|
|
|
|
|
|
Current Regulatory Assets |
|
6.4
|
|
5.4
|
|
|
Noncurrent Regulatory Assets |
|
410.9
|
|
404.8
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Current Regulatory Liabilities |
|
1.5
|
|
20.8
|
|
|
Noncurrent Regulatory Liabilities |
|
2,447.9
|
|
2,041.9
|
|
|
Effects of Regulation Textuals [Abstract] |
|
|
|
|
|
|
Revisions in Cash Flow Estimates |
[6],[7],[8],[9] |
59.4
|
|
(4.9)
|
|
|
Accumulated Depreciation and Amortization |
|
3,899.8
|
|
3,552.5
|
|
|
Pending Reg Assets Approved in Rate Case |
|
3.0
|
|
|
|
|
Ohio Power Co [Member] |
|
|
|
|
|
|
Regulated Generating Unit to be Retired |
|
|
|
|
|
|
Net Investment |
|
7,963.0
|
|
7,452.1
|
|
|
Materials and Supplies |
|
74.1
|
|
66.9
|
|
|
Annual Depreciation |
|
301.1
|
|
275.0
|
|
229.4
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
293.0
|
|
385.8
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Current Regulatory Liabilities |
|
0.0
|
|
3.9
|
|
|
Noncurrent Regulatory Liabilities |
|
1,020.9
|
|
1,005.2
|
|
|
Effects of Regulation Textuals [Abstract] |
|
|
|
|
|
|
Revisions in Cash Flow Estimates |
[6],[9] |
0.0
|
|
0.0
|
|
|
Accumulated Depreciation and Amortization |
|
2,458.3
|
|
2,350.0
|
|
|
Public Service Co Of Oklahoma [Member] |
|
|
|
|
|
|
Regulated Generating Unit to be Retired |
|
|
|
|
|
|
Net Investment |
|
4,802.8
|
|
4,320.0
|
|
|
Materials and Supplies |
|
56.2
|
|
54.0
|
|
|
Annual Depreciation |
|
185.9
|
|
171.9
|
|
162.5
|
Regulatory Assets |
|
|
|
|
|
|
Current Regulatory Assets |
|
194.6
|
|
30.1
|
|
|
Noncurrent Regulatory Assets |
|
1,037.4
|
|
375.0
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
835.3
|
|
802.2
|
|
|
Effects of Regulation Textuals [Abstract] |
|
|
|
|
|
|
Revisions in Cash Flow Estimates |
[6],[7],[9] |
0.0
|
|
(4.8)
|
|
|
Accumulated Depreciation and Amortization |
|
1,705.2
|
|
1,605.6
|
|
|
Southwestern Electric Power Co [Member] |
|
|
|
|
|
|
Regulated Generating Unit to be Retired |
|
|
|
|
|
|
Net Investment |
|
7,400.1
|
|
7,088.2
|
|
|
Materials and Supplies |
|
81.9
|
|
95.8
|
|
|
Annual Depreciation |
|
292.9
|
|
271.2
|
|
247.9
|
Regulatory Assets |
|
|
|
|
|
|
Current Regulatory Assets |
|
143.9
|
|
2.6
|
|
|
Noncurrent Regulatory Assets |
|
1,005.3
|
|
403.1
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Current Regulatory Liabilities |
|
0.0
|
|
37.6
|
|
|
Noncurrent Regulatory Liabilities |
|
806.9
|
|
863.4
|
|
|
Effects of Regulation Textuals [Abstract] |
|
|
|
|
|
|
Revisions in Cash Flow Estimates |
[5],[6],[7],[9] |
2.5
|
|
10.1
|
|
|
Accumulated Depreciation and Amortization |
|
3,170.3
|
|
3,158.5
|
|
|
Asset Impairments and Other Related Charges |
|
11.6
|
|
0.0
|
|
$ 0.0
|
Net Under-Recovered Fuel Costs |
|
144.0
|
|
|
|
|
Regulatory Liabilities Approved for Payment [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
8,423.9
|
|
7,889.8
|
|
|
Regulatory Liabilities Approved for Payment [Member] | AEP Texas Inc. [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
1,229.0
|
|
1,276.5
|
|
|
Regulatory Liabilities Approved for Payment [Member] | AEP Transmission Co [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
635.4
|
|
581.8
|
|
|
Regulatory Liabilities Approved for Payment [Member] | Appalachian Power Co [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
1,234.3
|
|
1,224.7
|
|
|
Regulatory Liabilities Approved for Payment [Member] | Indiana Michigan Power Co [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
2,447.9
|
|
2,041.9
|
|
|
Regulatory Liabilities Approved for Payment [Member] | Ohio Power Co [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
1,020.7
|
|
1,005.0
|
|
|
Regulatory Liabilities Approved for Payment [Member] | Public Service Co Of Oklahoma [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
779.1
|
|
802.2
|
|
|
Regulatory Liabilities Approved for Payment [Member] | Southwestern Electric Power Co [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
806.9
|
|
550.0
|
|
|
Regulatory Liabilities Pending Final Regulatory Determination [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
262.4
|
|
488.9
|
|
|
Regulatory Liabilities Pending Final Regulatory Determination [Member] | AEP Texas Inc. [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
13.0
|
|
(5.7)
|
|
|
Regulatory Liabilities Pending Final Regulatory Determination [Member] | AEP Transmission Co [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
[11] |
8.7
|
|
0.0
|
|
|
Regulatory Liabilities Pending Final Regulatory Determination [Member] | Appalachian Power Co [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
[12] |
4.5
|
|
0.0
|
|
|
Regulatory Liabilities Pending Final Regulatory Determination [Member] | Ohio Power Co [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
0.2
|
|
0.2
|
|
|
Regulatory Liabilities Pending Final Regulatory Determination [Member] | Public Service Co Of Oklahoma [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
[13] |
56.2
|
|
0.0
|
|
|
Regulatory Liabilities Pending Final Regulatory Determination [Member] | Southwestern Electric Power Co [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
[14] |
0.0
|
|
313.4
|
|
|
Kentucky Power Co [Member] |
|
|
|
|
|
|
Effects of Regulation Textuals [Abstract] |
|
|
|
|
|
|
Liabilities Held for Sale |
|
148.0
|
|
|
|
|
Kentucky Transmission Company | AEP Transmission Co [Member] |
|
|
|
|
|
|
Effects of Regulation Textuals [Abstract] |
|
|
|
|
|
|
Liabilities Held for Sale |
|
8.0
|
|
|
|
|
Regulatory Liabilities Currently Paying a Return [Member] | Regulatory Liabilities Approved for Payment [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
3,207.3
|
|
3,091.2
|
|
|
Regulatory Liabilities Currently Paying a Return [Member] | Regulatory Liabilities Approved for Payment [Member] | AEP Texas Inc. [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
749.5
|
|
723.6
|
|
|
Regulatory Liabilities Currently Paying a Return [Member] | Regulatory Liabilities Approved for Payment [Member] | AEP Transmission Co [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
271.4
|
|
198.6
|
|
|
Regulatory Liabilities Currently Paying a Return [Member] | Regulatory Liabilities Approved for Payment [Member] | Appalachian Power Co [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
703.6
|
|
679.2
|
|
|
Regulatory Liabilities Currently Paying a Return [Member] | Regulatory Liabilities Approved for Payment [Member] | Indiana Michigan Power Co [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
201.6
|
|
185.6
|
|
|
Regulatory Liabilities Currently Paying a Return [Member] | Regulatory Liabilities Approved for Payment [Member] | Ohio Power Co [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
467.6
|
|
458.4
|
|
|
Regulatory Liabilities Currently Paying a Return [Member] | Regulatory Liabilities Approved for Payment [Member] | Public Service Co Of Oklahoma [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
300.2
|
|
289.9
|
|
|
Regulatory Liabilities Currently Paying a Return [Member] | Regulatory Liabilities Approved for Payment [Member] | Southwestern Electric Power Co [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
463.7
|
|
473.3
|
|
|
Regulatory Liabilities Currently Paying a Return [Member] | Regulatory Liabilities Pending Final Regulatory Determination [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
0.0
|
|
2.5
|
|
|
Regulatory Liabilities Currently Paying a Return [Member] | Regulatory Liabilities Pending Final Regulatory Determination [Member] | AEP Texas Inc. [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
0.0
|
|
2.5
|
|
|
Regulatory Liabilities Currently Not Paying Return [Member] | Regulatory Liabilities Approved for Payment [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
2,505.2
|
|
2,005.9
|
|
|
Regulatory Liabilities Currently Not Paying Return [Member] | Regulatory Liabilities Approved for Payment [Member] | AEP Texas Inc. [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
34.2
|
|
57.9
|
|
|
Regulatory Liabilities Currently Not Paying Return [Member] | Regulatory Liabilities Approved for Payment [Member] | Appalachian Power Co [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
97.8
|
|
72.8
|
|
|
Regulatory Liabilities Currently Not Paying Return [Member] | Regulatory Liabilities Approved for Payment [Member] | Indiana Michigan Power Co [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
2,063.7
|
|
1,601.5
|
|
|
Regulatory Liabilities Currently Not Paying Return [Member] | Regulatory Liabilities Approved for Payment [Member] | Ohio Power Co [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
72.5
|
|
50.8
|
|
|
Regulatory Liabilities Currently Not Paying Return [Member] | Regulatory Liabilities Approved for Payment [Member] | Public Service Co Of Oklahoma [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
55.1
|
|
52.3
|
|
|
Regulatory Liabilities Currently Not Paying Return [Member] | Regulatory Liabilities Approved for Payment [Member] | Southwestern Electric Power Co [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
13.0
|
|
8.2
|
|
|
Regulatory Liabilities Currently Not Paying Return [Member] | Regulatory Liabilities Pending Final Regulatory Determination [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
0.2
|
|
1.5
|
|
|
Income Tax Related Regulatory Liabilities [Member] | Regulatory Liabilities Approved for Payment [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
[15] |
2,711.4
|
|
2,792.7
|
|
|
Income Tax Related Regulatory Liabilities [Member] | Regulatory Liabilities Approved for Payment [Member] | AEP Texas Inc. [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
[16] |
445.3
|
|
495.0
|
|
|
Income Tax Related Regulatory Liabilities [Member] | Regulatory Liabilities Approved for Payment [Member] | AEP Transmission Co [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
[11] |
364.0
|
|
383.2
|
|
|
Income Tax Related Regulatory Liabilities [Member] | Regulatory Liabilities Approved for Payment [Member] | Appalachian Power Co [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
[12] |
432.9
|
|
472.7
|
|
|
Income Tax Related Regulatory Liabilities [Member] | Regulatory Liabilities Approved for Payment [Member] | Indiana Michigan Power Co [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
[17] |
182.6
|
|
254.8
|
|
|
Income Tax Related Regulatory Liabilities [Member] | Regulatory Liabilities Approved for Payment [Member] | Ohio Power Co [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
[18] |
480.6
|
|
495.8
|
|
|
Income Tax Related Regulatory Liabilities [Member] | Regulatory Liabilities Approved for Payment [Member] | Public Service Co Of Oklahoma [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
[13] |
423.8
|
|
460.0
|
|
|
Income Tax Related Regulatory Liabilities [Member] | Regulatory Liabilities Approved for Payment [Member] | Southwestern Electric Power Co [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
[14] |
330.2
|
|
68.5
|
|
|
Income Tax Related Regulatory Liabilities [Member] | Regulatory Liabilities Pending Final Regulatory Determination [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
[15] |
262.2
|
|
484.9
|
|
|
Income Tax Related Regulatory Liabilities [Member] | Regulatory Liabilities Pending Final Regulatory Determination [Member] | AEP Texas Inc. [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
[16] |
13.0
|
|
(8.2)
|
|
|
Regulatory Assets Pending Final Regulatory Approval [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
985.9
|
|
442.2
|
|
|
Regulatory Assets Pending Final Regulatory Approval [Member] | AEP Texas Inc. [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
41.2
|
|
32.9
|
|
|
Regulatory Assets Pending Final Regulatory Approval [Member] | Appalachian Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
105.1
|
|
43.8
|
|
|
Regulatory Assets Pending Final Regulatory Approval [Member] | Indiana Michigan Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
3.7
|
|
4.3
|
|
|
Regulatory Assets Pending Final Regulatory Approval [Member] | Ohio Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
3.8
|
|
8.4
|
|
|
Regulatory Assets Pending Final Regulatory Approval [Member] | Public Service Co Of Oklahoma [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
14.2
|
|
50.5
|
|
|
Regulatory Assets Pending Final Regulatory Approval [Member] | Southwestern Electric Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
817.9
|
|
247.3
|
|
|
Regulatory Assets Approved for Recovery [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
3,156.4
|
|
3,084.8
|
|
|
Regulatory Assets Approved for Recovery [Member] | AEP Texas Inc. [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
234.0
|
|
233.9
|
|
|
Regulatory Assets Approved for Recovery [Member] | AEP Transmission Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
8.5
|
|
15.1
|
|
|
Regulatory Assets Approved for Recovery [Member] | Appalachian Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
652.5
|
|
642.5
|
|
|
Regulatory Assets Approved for Recovery [Member] | Indiana Michigan Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
407.2
|
|
400.5
|
|
|
Regulatory Assets Approved for Recovery [Member] | Ohio Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
289.2
|
|
377.4
|
|
|
Regulatory Assets Approved for Recovery [Member] | Public Service Co Of Oklahoma [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
1,023.2
|
|
324.5
|
|
|
Regulatory Assets Approved for Recovery [Member] | Southwestern Electric Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
187.4
|
|
155.8
|
|
|
Kentucky Power Co [Member] |
|
|
|
|
|
|
Effects of Regulation Textuals [Abstract] |
|
|
|
|
|
|
Assets Held for Sale |
|
485.0
|
|
|
|
|
Regulatory Assets Currently Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
648.0
|
|
220.7
|
|
|
Regulatory Assets Currently Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] | AEP Texas Inc. [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
0.0
|
|
16.3
|
|
|
Regulatory Assets Currently Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] | Appalachian Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
6.8
|
|
3.7
|
|
|
Regulatory Assets Currently Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] | Indiana Michigan Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
0.1
|
|
0.5
|
|
|
Regulatory Assets Currently Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] | Public Service Co Of Oklahoma [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
0.0
|
|
34.4
|
|
|
Regulatory Assets Currently Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] | Southwestern Electric Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
641.2
|
|
124.4
|
|
|
Regulatory Assets Currently Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
1,535.1
|
|
1,131.4
|
|
|
Regulatory Assets Currently Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] | AEP Texas Inc. [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
35.4
|
|
29.3
|
|
|
Regulatory Assets Currently Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] | Appalachian Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
110.4
|
|
123.4
|
|
|
Regulatory Assets Currently Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] | Indiana Michigan Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
303.3
|
|
298.4
|
|
|
Regulatory Assets Currently Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] | Ohio Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
56.9
|
|
60.2
|
|
|
Regulatory Assets Currently Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] | Public Service Co Of Oklahoma [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
981.5
|
|
253.7
|
|
|
Regulatory Assets Currently Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] | Southwestern Electric Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
29.9
|
|
33.6
|
|
|
Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
337.9
|
|
221.5
|
|
|
Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] | AEP Texas Inc. [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
41.2
|
|
16.6
|
|
|
Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] | Appalachian Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
98.3
|
|
40.1
|
|
|
Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] | Indiana Michigan Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
3.6
|
[19] |
3.8
|
|
|
Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] | Public Service Co Of Oklahoma [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
14.2
|
|
16.1
|
|
|
Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] | Southwestern Electric Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
176.7
|
|
122.9
|
|
|
Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
1,621.3
|
|
1,953.4
|
|
|
Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] | AEP Texas Inc. [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
198.6
|
|
204.6
|
|
|
Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] | Appalachian Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
542.1
|
|
519.1
|
|
|
Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] | Indiana Michigan Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
103.9
|
|
102.1
|
|
|
Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] | Ohio Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
232.3
|
|
317.2
|
|
|
Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] | Public Service Co Of Oklahoma [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
41.7
|
|
70.8
|
|
|
Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] | Southwestern Electric Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
157.5
|
|
122.2
|
|
|
Northeastern Plant, Unit 3 [Member] | Generating Units Probable of Abandonment [Member] | Public Service Co Of Oklahoma [Member] |
|
|
|
|
|
|
Regulated Generating Unit to be Retired |
|
|
|
|
|
|
Net Investment |
|
167.2
|
|
|
|
|
Accelerated Depreciation Regulatory Asset |
|
128.1
|
|
|
|
|
Cost of Removal Regulatory Liability |
[20] |
$ 20.0
|
|
|
|
|
Expected Retirement Date |
[21] |
2026
|
|
|
|
|
Annual Depreciation |
[22] |
$ 14.9
|
|
|
|
|
Pirkey Power Plant [Member] | Generating Units Probable of Abandonment [Member] | Southwestern Electric Power Co [Member] |
|
|
|
|
|
|
Regulated Generating Unit to be Retired |
|
|
|
|
|
|
Net Investment |
|
120.0
|
|
|
|
|
Accelerated Depreciation Regulatory Asset |
|
87.0
|
|
|
|
|
Cost of Removal Regulatory Liability |
|
$ 39.3
|
|
|
|
|
Expected Retirement Date |
[23] |
2023
|
|
|
|
|
Annual Depreciation |
[22] |
$ 13.5
|
|
|
|
|
Welsh Plant, Units 1 and 3 [Member] | Generating Units Probable of Abandonment [Member] | Southwestern Electric Power Co [Member] |
|
|
|
|
|
|
Regulated Generating Unit to be Retired |
|
|
|
|
|
|
Net Investment |
|
475.2
|
|
|
|
|
Accelerated Depreciation Regulatory Asset |
|
45.9
|
|
|
|
|
Cost of Removal Regulatory Liability |
[24] |
$ 58.4
|
|
|
|
|
Expected Retirement Date |
[25] |
2028
|
|
|
|
|
Annual Depreciation |
[22] |
$ 36.4
|
|
|
|
|
Deferred Fuel Costs [Member] | Regulatory Liabilities Currently Paying a Return [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Current Regulatory Liabilities |
|
0.0
|
|
27.6
|
|
|
Deferred Fuel Costs [Member] | Regulatory Liabilities Currently Paying a Return [Member] | Southwestern Electric Power Co [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Current Regulatory Liabilities |
|
0.0
|
|
37.6
|
[26] |
|
Deferred Fuel Costs [Member] | Regulatory Liabilities Currently Not Paying Return [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Current Regulatory Liabilities |
|
$ 1.5
|
|
25.0
|
|
|
Remaining Refund Period |
|
1 year
|
|
|
|
|
Deferred Fuel Costs [Member] | Regulatory Liabilities Currently Not Paying Return [Member] | Indiana Michigan Power Co [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Current Regulatory Liabilities |
|
$ 1.5
|
|
20.8
|
|
|
Remaining Refund Period |
|
1 year
|
|
|
|
|
Deferred Fuel Costs [Member] | Regulatory Liabilities Currently Not Paying Return [Member] | Ohio Power Co [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Current Regulatory Liabilities |
|
$ 0.0
|
|
3.9
|
|
|
Deferred Fuel Costs [Member] | Regulatory Liabilities Currently Not Paying Return [Member] | Regulatory Liabilities Approved for Payment [Member] | Ohio Power Co [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
$ 15.2
|
|
0.0
|
|
|
Remaining Refund Period |
|
11 years
|
|
|
|
|
Deferred Fuel Costs [Member] | Regulatory Assets Currently Earning Return [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Current Regulatory Assets |
|
$ 409.4
|
|
41.4
|
|
|
Remaining Recovery Period |
|
1 year
|
|
|
|
|
Deferred Fuel Costs [Member] | Regulatory Assets Currently Earning Return [Member] | Appalachian Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Current Regulatory Assets |
|
$ 127.2
|
|
3.3
|
|
|
Remaining Recovery Period |
|
1 year
|
|
|
|
|
Deferred Fuel Costs [Member] | Regulatory Assets Currently Earning Return [Member] | Indiana Michigan Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Current Regulatory Assets |
|
$ 6.4
|
|
5.4
|
|
|
Remaining Recovery Period |
|
1 year
|
|
|
|
|
Deferred Fuel Costs [Member] | Regulatory Assets Currently Earning Return [Member] | Public Service Co Of Oklahoma [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Current Regulatory Assets |
|
$ 194.6
|
|
30.1
|
|
|
Remaining Recovery Period |
|
1 year
|
|
|
|
|
Deferred Fuel Costs [Member] | Regulatory Assets Currently Earning Return [Member] | Southwestern Electric Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Current Regulatory Assets |
[27] |
$ 81.2
|
|
2.6
|
|
|
Remaining Recovery Period |
|
1 year
|
|
|
|
|
Deferred Fuel Costs [Member] | Regulatory Assets Currently Not Earning Return [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Current Regulatory Assets |
|
$ 175.7
|
|
49.3
|
|
|
Remaining Recovery Period |
|
1 year
|
|
|
|
|
Deferred Fuel Costs [Member] | Regulatory Assets Currently Not Earning Return [Member] | Appalachian Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Current Regulatory Assets |
|
$ 74.1
|
|
2.0
|
|
|
Remaining Recovery Period |
|
1 year
|
|
|
|
|
Dolet Hills Power Station Accelerated Depreciation [Member] | Regulatory Assets Currently Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
$ 72.3
|
|
71.2
|
|
|
Dolet Hills Power Station Accelerated Depreciation [Member] | Regulatory Assets Currently Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] | Southwestern Electric Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
[28] |
72.3
|
|
71.2
|
|
|
Kentucky Deferred Purchase Power Expenses [Member] | Regulatory Assets Currently Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
0.0
|
|
41.3
|
|
|
Plant Retirement Costs - Unrecovered Plant, Louisiana [Member] | Southwestern Electric Power Co [Member] | Regulatory Assets Currently Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
35.0
|
|
|
|
|
Plant Retirement Costs - Unrecovered Plant, Louisiana [Member] | Regulatory Assets Currently Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
35.2
|
|
35.2
|
|
|
Plant Retirement Costs - Unrecovered Plant, Louisiana [Member] | Regulatory Assets Currently Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] | Southwestern Electric Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
35.2
|
|
35.2
|
|
|
Pirkey Power Plant Accelerated Depreciation [Member] | Regulatory Assets Currently Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
87.0
|
|
12.2
|
|
|
Pirkey Power Plant Accelerated Depreciation [Member] | Regulatory Assets Currently Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] | Southwestern Electric Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
87.0
|
|
12.2
|
|
|
Welsh Plant, Units 1 and 3 Accelerated Depreciation [Member] | Regulatory Assets Currently Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
45.9
|
|
3.6
|
|
|
Welsh Plant, Units 1 and 3 Accelerated Depreciation [Member] | Regulatory Assets Currently Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] | Southwestern Electric Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
45.9
|
|
3.6
|
|
|
Oklaunion Power Station Accelerated Depreciation [Member] | Regulatory Assets Currently Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
0.0
|
|
34.4
|
|
|
Oklaunion Power Station Accelerated Depreciation [Member] | Regulatory Assets Currently Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] | Public Service Co Of Oklahoma [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
0.0
|
|
34.4
|
|
|
COVID-19 - Virginia [Member] | Regulatory Assets Currently Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] | Appalachian Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
6.8
|
|
3.7
|
|
|
Other Regulatory Assets Pending Final Regulatory Approval [Member] | Regulatory Assets Currently Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
9.2
|
|
22.8
|
|
|
Other Regulatory Assets Pending Final Regulatory Approval [Member] | Regulatory Assets Currently Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] | Indiana Michigan Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
0.1
|
|
0.5
|
|
|
Other Regulatory Assets Pending Final Regulatory Approval [Member] | Regulatory Assets Currently Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] | Southwestern Electric Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
2.4
|
|
2.2
|
|
|
Other Regulatory Assets Pending Final Regulatory Approval [Member] | Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
43.9
|
|
36.5
|
|
|
Other Regulatory Assets Pending Final Regulatory Approval [Member] | Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] | AEP Texas Inc. [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
7.4
|
|
1.5
|
|
|
Other Regulatory Assets Pending Final Regulatory Approval [Member] | Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] | Appalachian Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
3.6
|
|
1.5
|
|
|
Other Regulatory Assets Pending Final Regulatory Approval [Member] | Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] | Indiana Michigan Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
1.9
|
|
0.0
|
|
|
Other Regulatory Assets Pending Final Regulatory Approval [Member] | Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] | Southwestern Electric Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
18.4
|
|
14.5
|
|
|
Storm Related Costs [Member] | Regulatory Assets Currently Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
$ 17.4
|
|
11.5
|
|
|
Remaining Recovery Period |
|
3 years
|
|
|
|
|
Storm Related Costs [Member] | Regulatory Assets Currently Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] | Public Service Co Of Oklahoma [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
$ 17.4
|
|
11.5
|
|
|
Remaining Recovery Period |
|
3 years
|
|
|
|
|
Storm Related Costs [Member] | Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
$ 256.9
|
|
134.2
|
|
|
Storm Related Costs [Member] | Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] | AEP Texas Inc. [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
22.4
|
|
0.8
|
|
|
Storm Related Costs [Member] | Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] | Appalachian Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
68.8
|
|
3.4
|
|
|
Storm Related Costs [Member] | Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] | Ohio Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
3.8
|
|
4.0
|
|
|
Storm Related Costs [Member] | Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] | Public Service Co Of Oklahoma [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
13.9
|
|
15.8
|
|
|
Storm Related Costs [Member] | Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] | Southwestern Electric Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
148.0
|
|
99.3
|
|
|
Storm Related Costs [Member] | Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] | AEP Texas Inc. [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
$ 12.8
|
|
17.1
|
|
|
Remaining Recovery Period |
|
3 years
|
|
|
|
|
Storm Related Costs [Member] | Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] | Indiana Michigan Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
$ 12.6
|
|
0.3
|
|
|
Remaining Recovery Period |
|
2 years
|
|
|
|
|
Plant Retirement Costs - Asset Retirement Obligation Costs [Member] | Regulatory Assets Currently Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
$ 0.0
|
|
107.1
|
|
|
Plant Retirement Costs - Asset Retirement Obligation Costs [Member] | Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
25.9
|
|
25.9
|
|
|
Plant Retirement Costs - Asset Retirement Obligation Costs [Member] | Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] | Appalachian Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
25.9
|
|
25.9
|
|
|
Plant Retirement Costs - Asset Retirement Obligation Costs [Member] | Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
$ 293.2
|
|
212.7
|
|
|
Remaining Recovery Period |
|
21 years
|
|
|
|
|
Plant Retirement Costs - Asset Retirement Obligation Costs [Member] | Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] | Appalachian Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
$ 293.1
|
|
202.7
|
|
|
Remaining Recovery Period |
|
15 years
|
|
|
|
|
Environmental Expense Deferral - Virginia [Member] | Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] | Appalachian Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
$ 0.0
|
|
9.3
|
|
|
COVID-19 [Member] | Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
11.2
|
|
24.9
|
|
|
COVID-19 [Member] | Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] | AEP Texas Inc. [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
2.1
|
|
10.5
|
|
|
COVID-19 [Member] | Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] | Indiana Michigan Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
1.7
|
|
3.8
|
|
|
COVID-19 [Member] | Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] | Ohio Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
0.0
|
|
4.4
|
|
|
COVID-19 [Member] | Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] | Public Service Co Of Oklahoma [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
0.3
|
|
0.3
|
|
|
Vegetation Management Program [Member] | Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] | AEP Texas Inc. [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
5.2
|
|
3.8
|
|
|
Vegetation Management Program [Member] | Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] | AEP Texas Inc. [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
$ 17.4
|
|
22.4
|
|
|
Remaining Recovery Period |
|
4 years
|
|
|
|
|
Plant Retirement Costs - Unrecovered Plant [Member] | Regulatory Assets Currently Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
[29] |
$ 522.2
|
|
713.1
|
|
|
Remaining Recovery Period |
|
25 years
|
|
|
|
|
Plant Retirement Costs - Unrecovered Plant [Member] | Regulatory Assets Currently Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] | Appalachian Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
$ 110.0
|
|
122.4
|
|
|
Remaining Recovery Period |
|
22 years
|
|
|
|
|
Plant Retirement Costs - Unrecovered Plant [Member] | Regulatory Assets Currently Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] | Indiana Michigan Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
$ 170.8
|
|
191.5
|
|
|
Remaining Recovery Period |
|
7 years
|
|
|
|
|
Plant Retirement Costs - Unrecovered Plant [Member] | Regulatory Assets Currently Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] | Public Service Co Of Oklahoma [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
[30] |
$ 227.6
|
|
180.8
|
|
|
Remaining Recovery Period |
|
25 years
|
|
|
|
|
Plant Retirement Costs - Unrecovered Plant, Arkansas [Member] | Regulatory Assets Currently Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] | Southwestern Electric Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
$ 13.7
|
|
14.4
|
|
|
Remaining Recovery Period |
|
21 years
|
|
|
|
|
Plant Retirement Costs - Unrecovered Plant, Texas [Member] | Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
$ 51.9
|
|
16.1
|
|
|
Remaining Recovery Period |
|
25 years
|
|
|
|
|
Plant Retirement Costs - Unrecovered Plant, Texas [Member] | Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] | Southwestern Electric Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
$ 51.9
|
|
16.1
|
|
|
Remaining Recovery Period |
|
25 years
|
|
|
|
|
Meter Replacement Costs [Member] | Regulatory Assets Currently Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
$ 44.9
|
|
55.5
|
|
|
Remaining Recovery Period |
|
6 years
|
|
|
|
|
Meter Replacement Costs [Member] | Regulatory Assets Currently Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] | AEP Texas Inc. [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
$ 22.7
|
|
29.3
|
|
|
Remaining Recovery Period |
|
5 years
|
|
|
|
|
Meter Replacement Costs [Member] | Regulatory Assets Currently Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] | Public Service Co Of Oklahoma [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
$ 22.2
|
|
26.2
|
|
|
Remaining Recovery Period |
|
6 years
|
|
|
|
|
Ohio Distribution Decoupling [Member] | Regulatory Assets Currently Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
$ 41.6
|
|
46.6
|
|
|
Remaining Recovery Period |
|
2 years
|
|
|
|
|
Ohio Distribution Decoupling [Member] | Regulatory Assets Currently Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] | Ohio Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
$ 41.6
|
|
46.6
|
|
|
Remaining Recovery Period |
|
2 years
|
|
|
|
|
Ohio Basic Transmission Cost Rider [Member] | Regulatory Assets Currently Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] | Ohio Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
$ 5.2
|
|
12.3
|
|
|
Remaining Recovery Period |
|
2 years
|
|
|
|
|
Environmental Controls Projects [Member] | Regulatory Assets Currently Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
$ 36.2
|
|
38.6
|
|
|
Remaining Recovery Period |
|
19 years
|
|
|
|
|
Environmental Controls Projects [Member] | Regulatory Assets Currently Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] | Public Service Co Of Oklahoma [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
$ 25.2
|
|
26.5
|
|
|
Remaining Recovery Period |
|
19 years
|
|
|
|
|
Environmental Controls Projects [Member] | Regulatory Assets Currently Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] | Southwestern Electric Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
$ 11.0
|
|
12.1
|
|
|
Remaining Recovery Period |
|
11 years
|
|
|
|
|
Rockport Plant Dry Sorbent Injection System and Selective Catalytic Reduction [Member] | Regulatory Assets Currently Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
$ 66.6
|
|
34.4
|
|
|
Remaining Recovery Period |
|
7 years
|
|
|
|
|
Rockport Plant Dry Sorbent Injection System and Selective Catalytic Reduction [Member] | Regulatory Assets Currently Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] | Indiana Michigan Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
$ 66.6
|
|
34.4
|
|
|
Remaining Recovery Period |
|
7 years
|
|
|
|
|
Cook Plant Uprate Project [Member] | Regulatory Assets Currently Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
$ 27.7
|
|
30.2
|
|
|
Remaining Recovery Period |
|
12 years
|
|
|
|
|
Cook Plant Uprate Project [Member] | Regulatory Assets Currently Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] | Indiana Michigan Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
$ 27.7
|
|
30.2
|
|
|
Remaining Recovery Period |
|
12 years
|
|
|
|
|
Advanced Metering System [Member] | Regulatory Assets Currently Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] | AEP Texas Inc. [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
$ 0.0
|
|
16.3
|
|
|
Advanced Metering System [Member] | Regulatory Assets Currently Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] | AEP Texas Inc. [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
$ 10.6
|
|
0.0
|
|
|
Remaining Recovery Period |
|
1 year
|
|
|
|
|
Other Regulatory Assets Approved for Recovery [Member] | Regulatory Assets Currently Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
$ 99.2
|
|
94.4
|
|
|
Other Regulatory Assets Approved for Recovery [Member] | Regulatory Assets Currently Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] | AEP Texas Inc. [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
2.1
|
|
0.0
|
|
|
Other Regulatory Assets Approved for Recovery [Member] | Regulatory Assets Currently Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] | Appalachian Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
0.4
|
|
1.0
|
|
|
Other Regulatory Assets Approved for Recovery [Member] | Regulatory Assets Currently Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] | Indiana Michigan Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
6.0
|
|
7.0
|
|
|
Other Regulatory Assets Approved for Recovery [Member] | Regulatory Assets Currently Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] | Public Service Co Of Oklahoma [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
1.9
|
|
0.5
|
|
|
Other Regulatory Assets Approved for Recovery [Member] | Regulatory Assets Currently Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] | Southwestern Electric Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
5.2
|
|
7.1
|
|
|
Other Regulatory Assets Approved for Recovery [Member] | Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
158.5
|
|
133.5
|
|
|
Other Regulatory Assets Approved for Recovery [Member] | Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] | AEP Texas Inc. [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
4.3
|
|
7.8
|
|
|
Other Regulatory Assets Approved for Recovery [Member] | Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] | Appalachian Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
10.7
|
|
12.7
|
|
|
Other Regulatory Assets Approved for Recovery [Member] | Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] | Indiana Michigan Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
13.8
|
|
16.0
|
|
|
Other Regulatory Assets Approved for Recovery [Member] | Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] | Ohio Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
12.3
|
|
15.8
|
|
|
Other Regulatory Assets Approved for Recovery [Member] | Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] | Public Service Co Of Oklahoma [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
13.1
|
|
12.4
|
|
|
Other Regulatory Assets Approved for Recovery [Member] | Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] | Southwestern Electric Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
18.8
|
|
17.0
|
|
|
Vegetation Management [Member] | Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
$ 29.3
|
|
67.8
|
|
|
Remaining Recovery Period |
|
4 years
|
|
|
|
|
Asset Retirement Obligation - Louisiana [Member] | Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] | Southwestern Electric Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
$ 10.3
|
|
9.1
|
|
|
Deferred Cook Plant Life Cycle Management Project Costs [Member] | Regulatory Assets Currently Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] | Indiana Michigan Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
$ 13.1
|
|
14.1
|
|
|
Remaining Recovery Period |
|
13 years
|
|
|
|
|
Cook Plant Study Costs - Indiana [Member] | Regulatory Assets Currently Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] | Indiana Michigan Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
$ 9.4
|
|
10.1
|
|
|
Remaining Recovery Period |
|
14 years
|
|
|
|
|
Cook Plant Turbine [Member] | Regulatory Assets Currently Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] | Indiana Michigan Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
$ 9.7
|
|
11.1
|
|
|
Remaining Recovery Period |
|
17 years
|
|
|
|
|
Pension and OPEB Funded Status [Member] | Regulatory Liabilities Currently Not Paying Return [Member] | Regulatory Liabilities Approved for Payment [Member] | Indiana Michigan Power Co [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
$ 27.6
|
|
0.0
|
|
|
Remaining Refund Period |
|
12 years
|
|
|
|
|
Pension and OPEB Funded Status [Member] | Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
$ 677.0
|
|
1,088.6
|
|
|
Remaining Recovery Period |
|
12 years
|
|
|
|
|
Pension and OPEB Funded Status [Member] | Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] | AEP Texas Inc. [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
$ 119.0
|
|
145.0
|
|
|
Remaining Recovery Period |
|
12 years
|
|
|
|
|
Pension and OPEB Funded Status [Member] | Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] | Appalachian Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
$ 62.7
|
|
114.4
|
|
|
Remaining Recovery Period |
|
12 years
|
|
|
|
|
Pension and OPEB Funded Status [Member] | Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] | Indiana Michigan Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
$ 0.0
|
|
25.7
|
|
|
Pension and OPEB Funded Status [Member] | Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] | Ohio Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
$ 83.3
|
|
130.7
|
|
|
Remaining Recovery Period |
|
12 years
|
|
|
|
|
Pension and OPEB Funded Status [Member] | Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] | Public Service Co Of Oklahoma [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
$ 22.9
|
|
52.3
|
|
|
Remaining Recovery Period |
|
12 years
|
|
|
|
|
Pension and OPEB Funded Status [Member] | Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] | Southwestern Electric Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
$ 73.8
|
|
89.1
|
|
|
Remaining Recovery Period |
|
12 years
|
|
|
|
|
Unamortized Loss on Reacquired Debt [Member] | Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
$ 111.2
|
|
120.0
|
|
|
Remaining Recovery Period |
|
27 years
|
|
|
|
|
Unamortized Loss on Reacquired Debt [Member] | Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] | Appalachian Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
$ 78.2
|
|
82.1
|
|
|
Remaining Recovery Period |
|
24 years
|
|
|
|
|
Unamortized Loss on Reacquired Debt [Member] | Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] | Indiana Michigan Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
$ 14.2
|
|
15.7
|
|
|
Remaining Recovery Period |
|
27 years
|
|
|
|
|
Unamortized Loss on Reacquired Debt [Member] | Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] | Public Service Co Of Oklahoma [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
$ 5.7
|
|
6.1
|
|
|
Remaining Recovery Period |
|
17 years
|
|
|
|
|
Peak Demand Reduction/Energy Efficiency [Member] | Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] | AEP Texas Inc. [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
$ 14.5
|
|
7.7
|
|
|
Remaining Recovery Period |
|
2 years
|
|
|
|
|
Peak Demand Reduction/Energy Efficiency [Member] | Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] | Appalachian Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
$ 17.8
|
|
16.8
|
|
|
Remaining Recovery Period |
|
5 years
|
|
|
|
|
Unrealized Loss on Forward Commitments [Member] | Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
$ 100.8
|
|
111.3
|
|
|
Remaining Recovery Period |
|
11 years
|
|
|
|
|
Unrealized Loss on Forward Commitments [Member] | Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] | Indiana Michigan Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
$ 7.2
|
|
0.0
|
|
|
Remaining Recovery Period |
|
3 years
|
|
|
|
|
Unrealized Loss on Forward Commitments [Member] | Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] | Ohio Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
$ 92.1
|
|
110.0
|
|
|
Remaining Recovery Period |
|
11 years
|
|
|
|
|
Virginia Transmission Rate Adjustment Clause [Member] | Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
$ 37.2
|
|
18.8
|
|
|
Remaining Recovery Period |
|
2 years
|
|
|
|
|
Virginia Transmission Rate Adjustment Clause [Member] | Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] | Appalachian Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
$ 37.2
|
|
18.8
|
|
|
Remaining Recovery Period |
|
2 years
|
|
|
|
|
Vegetation Management Program - West Virginia [Member] | Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] | Appalachian Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
$ 11.9
|
|
45.4
|
|
|
Remaining Recovery Period |
|
2 years
|
|
|
|
|
Cook Nuclear Plant Refueling Outage Levelization [Member] | Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
$ 32.0
|
|
39.5
|
|
|
Remaining Recovery Period |
|
3 years
|
|
|
|
|
Cook Nuclear Plant Refueling Outage Levelization [Member] | Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] | Indiana Michigan Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
$ 32.0
|
|
39.5
|
|
|
Remaining Recovery Period |
|
3 years
|
|
|
|
|
PJM/SPP Annual Formula Rate True Up [Member] | Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
$ 17.6
|
|
33.0
|
|
|
Remaining Recovery Period |
|
2 years
|
|
|
|
|
PJM/SPP Annual Formula Rate True Up [Member] | Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] | AEP Transmission Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
$ 8.5
|
|
15.1
|
|
|
Remaining Recovery Period |
|
2 years
|
|
|
|
|
Postemployment Benefits [Member] | Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
$ 29.1
|
|
29.1
|
|
|
Remaining Recovery Period |
|
3 years
|
|
|
|
|
Postemployment Benefits [Member] | Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] | Appalachian Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
$ 13.3
|
|
13.5
|
|
|
Remaining Recovery Period |
|
3 years
|
|
|
|
|
Postemployment Benefits [Member] | Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] | Indiana Michigan Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
$ 9.0
|
|
4.9
|
|
|
Remaining Recovery Period |
|
3 years
|
|
|
|
|
Postemployment Benefits [Member] | Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] | Ohio Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
$ 6.2
|
|
6.7
|
|
|
Remaining Recovery Period |
|
3 years
|
|
|
|
|
PJM Annual Formula Rate True-up [Member] | Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] | Appalachian Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
$ 3.5
|
|
12.7
|
|
|
Remaining Recovery Period |
|
2 years
|
|
|
|
|
OVEC Purchased Power [Member] | Regulatory Liabilities Currently Not Paying Return [Member] | Regulatory Liabilities Approved for Payment [Member] | Ohio Power Co [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
$ 14.8
|
|
0.0
|
|
|
Remaining Refund Period |
|
2 years
|
|
|
|
|
OVEC Purchased Power [Member] | Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
$ 0.0
|
|
27.4
|
|
|
OVEC Purchased Power [Member] | Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] | Ohio Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
0.0
|
|
27.4
|
|
|
Fuel and Purchased Power Adjustment Rider [Member] | Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
$ 12.1
|
|
24.0
|
|
|
Remaining Recovery Period |
|
2 years
|
|
|
|
|
PJM Costs and Off-system Sales Margin Sharing - Indiana [Member] | Regulatory Liabilities Currently Not Paying Return [Member] | Regulatory Liabilities Approved for Payment [Member] | Indiana Michigan Power Co [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
$ 0.0
|
|
13.3
|
|
|
PJM Costs and Off-system Sales Margin Sharing - Indiana [Member] | Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] | Indiana Michigan Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
$ 15.1
|
|
0.0
|
|
|
Remaining Recovery Period |
|
2 years
|
|
|
|
|
Other Regulatory Liabilities Pending Final Regulatory Determination [Member] | Regulatory Liabilities Currently Paying a Return [Member] | Regulatory Liabilities Pending Final Regulatory Determination [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
$ 0.0
|
|
2.5
|
|
|
Other Regulatory Liabilities Pending Final Regulatory Determination [Member] | Regulatory Liabilities Currently Paying a Return [Member] | Regulatory Liabilities Pending Final Regulatory Determination [Member] | AEP Texas Inc. [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
0.0
|
|
2.5
|
|
|
Other Regulatory Liabilities Pending Final Regulatory Determination [Member] | Regulatory Liabilities Currently Not Paying Return [Member] | Regulatory Liabilities Pending Final Regulatory Determination [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
0.2
|
|
1.5
|
|
|
Other Regulatory Liabilities Pending Final Regulatory Determination [Member] | Regulatory Liabilities Currently Not Paying Return [Member] | Regulatory Liabilities Pending Final Regulatory Determination [Member] | Ohio Power Co [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
0.2
|
|
0.2
|
|
|
Excess ADIT Associated with Certain Depreciable Property [Member] | Income Tax Related Regulatory Liabilities [Member] | Regulatory Liabilities Approved for Payment [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
[15],[31] |
3,556.7
|
|
3,485.7
|
|
|
Excess ADIT Associated with Certain Depreciable Property [Member] | Income Tax Related Regulatory Liabilities [Member] | Regulatory Liabilities Approved for Payment [Member] | AEP Texas Inc. [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
[16],[32] |
498.8
|
|
506.0
|
|
|
Excess ADIT Associated with Certain Depreciable Property [Member] | Income Tax Related Regulatory Liabilities [Member] | Regulatory Liabilities Approved for Payment [Member] | AEP Transmission Co [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
[11],[33] |
522.6
|
|
531.5
|
|
|
Excess ADIT Associated with Certain Depreciable Property [Member] | Income Tax Related Regulatory Liabilities [Member] | Regulatory Liabilities Approved for Payment [Member] | Appalachian Power Co [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
[12],[34] |
663.6
|
|
690.0
|
|
|
Excess ADIT Associated with Certain Depreciable Property [Member] | Income Tax Related Regulatory Liabilities [Member] | Regulatory Liabilities Approved for Payment [Member] | Indiana Michigan Power Co [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
[17],[35] |
433.6
|
|
450.6
|
|
|
Excess ADIT Associated with Certain Depreciable Property [Member] | Income Tax Related Regulatory Liabilities [Member] | Regulatory Liabilities Approved for Payment [Member] | Ohio Power Co [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
[18],[36] |
325.0
|
|
334.6
|
|
|
Excess ADIT Associated with Certain Depreciable Property [Member] | Income Tax Related Regulatory Liabilities [Member] | Regulatory Liabilities Approved for Payment [Member] | Public Service Co Of Oklahoma [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
[13],[37] |
389.3
|
|
397.0
|
|
|
Excess ADIT Associated with Certain Depreciable Property [Member] | Income Tax Related Regulatory Liabilities [Member] | Regulatory Liabilities Approved for Payment [Member] | Southwestern Electric Power Co [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
[14],[38] |
609.0
|
|
332.5
|
|
|
Excess ADIT Associated with Certain Depreciable Property [Member] | Income Tax Related Regulatory Liabilities [Member] | Regulatory Liabilities Pending Final Regulatory Determination [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
[15] |
0.0
|
|
291.6
|
|
|
Excess ADIT Associated with Certain Depreciable Property [Member] | Income Tax Related Regulatory Liabilities [Member] | Regulatory Liabilities Pending Final Regulatory Determination [Member] | Southwestern Electric Power Co [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
[14] |
0.0
|
|
291.6
|
|
|
Excess ADIT that is Not Subject to Rate Normalization Requirements [Member] | Income Tax Related Regulatory Liabilities [Member] | Regulatory Liabilities Approved for Payment [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
[15] |
$ 386.5
|
|
714.9
|
|
|
Remaining Refund Period |
|
7 years
|
|
|
|
|
Excess ADIT that is Not Subject to Rate Normalization Requirements [Member] | Income Tax Related Regulatory Liabilities [Member] | Regulatory Liabilities Approved for Payment [Member] | AEP Texas Inc. [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
[16] |
$ 0.0
|
|
41.7
|
|
|
Excess ADIT that is Not Subject to Rate Normalization Requirements [Member] | Income Tax Related Regulatory Liabilities [Member] | Regulatory Liabilities Approved for Payment [Member] | AEP Transmission Co [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
[11] |
$ (26.2)
|
|
(30.6)
|
|
|
Remaining Refund Period |
|
7 years
|
|
|
|
|
Excess ADIT that is Not Subject to Rate Normalization Requirements [Member] | Income Tax Related Regulatory Liabilities [Member] | Regulatory Liabilities Approved for Payment [Member] | Appalachian Power Co [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
[12] |
$ 83.6
|
|
139.1
|
|
|
Remaining Refund Period |
|
7 years
|
|
|
|
|
Excess ADIT that is Not Subject to Rate Normalization Requirements [Member] | Income Tax Related Regulatory Liabilities [Member] | Regulatory Liabilities Approved for Payment [Member] | Indiana Michigan Power Co [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
[17] |
$ 90.2
|
|
136.2
|
|
|
Remaining Refund Period |
|
3 years
|
|
|
|
|
Excess ADIT that is Not Subject to Rate Normalization Requirements [Member] | Income Tax Related Regulatory Liabilities [Member] | Regulatory Liabilities Approved for Payment [Member] | Ohio Power Co [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
[18] |
$ 190.8
|
|
223.9
|
|
|
Remaining Refund Period |
|
7 years
|
|
|
|
|
Excess ADIT that is Not Subject to Rate Normalization Requirements [Member] | Income Tax Related Regulatory Liabilities [Member] | Regulatory Liabilities Approved for Payment [Member] | Public Service Co Of Oklahoma [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
[13] |
$ 46.4
|
|
71.3
|
|
|
Remaining Refund Period |
|
3 years
|
|
|
|
|
Excess ADIT that is Not Subject to Rate Normalization Requirements [Member] | Income Tax Related Regulatory Liabilities [Member] | Regulatory Liabilities Approved for Payment [Member] | Southwestern Electric Power Co [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
[14] |
$ 7.0
|
|
11.5
|
|
|
Remaining Refund Period |
|
1 year
|
|
|
|
|
Excess ADIT that is Not Subject to Rate Normalization Requirements [Member] | Income Tax Related Regulatory Liabilities [Member] | Regulatory Liabilities Pending Final Regulatory Determination [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
[15],[40] |
$ 262.2
|
[39] |
193.3
|
|
|
Excess ADIT that is Not Subject to Rate Normalization Requirements [Member] | Income Tax Related Regulatory Liabilities [Member] | Regulatory Liabilities Pending Final Regulatory Determination [Member] | AEP Texas Inc. [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
[16] |
13.0
|
|
(8.2)
|
|
|
Excess ADIT that is Not Subject to Rate Normalization Requirements [Member] | Income Tax Related Regulatory Liabilities [Member] | Regulatory Liabilities Pending Final Regulatory Determination [Member] | AEP Transmission Co [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
[11] |
8.7
|
[41] |
0.0
|
|
|
Excess ADIT that is Not Subject to Rate Normalization Requirements [Member] | Income Tax Related Regulatory Liabilities [Member] | Regulatory Liabilities Pending Final Regulatory Determination [Member] | Appalachian Power Co [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
[12] |
4.5
|
[42] |
0.0
|
|
|
Excess ADIT that is Not Subject to Rate Normalization Requirements [Member] | Income Tax Related Regulatory Liabilities [Member] | Regulatory Liabilities Pending Final Regulatory Determination [Member] | Public Service Co Of Oklahoma [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
[13],[43] |
56.2
|
|
0.0
|
|
|
Excess ADIT that is Not Subject to Rate Normalization Requirements [Member] | Income Tax Related Regulatory Liabilities [Member] | Regulatory Liabilities Pending Final Regulatory Determination [Member] | Southwestern Electric Power Co [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
[14] |
0.0
|
|
21.8
|
|
|
Excess ADIT that is Not Subject to Rate Normalization Requirements [Member] | Income Tax Related Regulatory Liabilities [Member] | Regulatory Liabilities Pending Final Regulatory Determination [Member] | AEPTHCo's investment in ETT and Transource Energy [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
173.0
|
|
173.0
|
|
|
Asset Removal Costs [Member] | Regulatory Liabilities Currently Paying a Return [Member] | Regulatory Liabilities Approved for Payment [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
[44] |
3,172.1
|
|
3,061.9
|
|
|
Asset Removal Costs [Member] | Regulatory Liabilities Currently Paying a Return [Member] | Regulatory Liabilities Approved for Payment [Member] | AEP Texas Inc. [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
[45] |
744.7
|
|
718.3
|
|
|
Asset Removal Costs [Member] | Regulatory Liabilities Currently Paying a Return [Member] | Regulatory Liabilities Approved for Payment [Member] | AEP Transmission Co [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
[46] |
271.4
|
|
198.6
|
|
|
Asset Removal Costs [Member] | Regulatory Liabilities Currently Paying a Return [Member] | Regulatory Liabilities Approved for Payment [Member] | Appalachian Power Co [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
[47] |
703.3
|
|
678.9
|
|
|
Asset Removal Costs [Member] | Regulatory Liabilities Currently Paying a Return [Member] | Regulatory Liabilities Approved for Payment [Member] | Indiana Michigan Power Co [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
[48] |
179.7
|
|
168.2
|
|
|
Asset Removal Costs [Member] | Regulatory Liabilities Currently Paying a Return [Member] | Regulatory Liabilities Approved for Payment [Member] | Ohio Power Co [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
[49] |
467.6
|
|
458.4
|
|
|
Asset Removal Costs [Member] | Regulatory Liabilities Currently Paying a Return [Member] | Regulatory Liabilities Approved for Payment [Member] | Public Service Co Of Oklahoma [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
[50] |
300.2
|
|
289.9
|
|
|
Asset Removal Costs [Member] | Regulatory Liabilities Currently Paying a Return [Member] | Regulatory Liabilities Approved for Payment [Member] | Southwestern Electric Power Co [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
[51] |
461.3
|
|
470.9
|
|
|
Deferred Investment Tax Credits [Member] | Regulatory Liabilities Currently Paying a Return [Member] | Regulatory Liabilities Approved for Payment [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
$ 2.1
|
|
4.1
|
|
|
Remaining Refund Period |
|
32 years
|
|
|
|
|
Deferred Investment Tax Credits [Member] | Regulatory Liabilities Currently Paying a Return [Member] | Regulatory Liabilities Approved for Payment [Member] | Appalachian Power Co [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
$ 0.3
|
|
0.3
|
|
|
Remaining Refund Period |
|
32 years
|
|
|
|
|
Deferred Investment Tax Credits [Member] | Regulatory Liabilities Currently Not Paying Return [Member] | Regulatory Liabilities Approved for Payment [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
$ 248.5
|
|
216.7
|
|
|
Remaining Refund Period |
|
35 years
|
|
|
|
|
Deferred Investment Tax Credits [Member] | Regulatory Liabilities Currently Not Paying Return [Member] | Regulatory Liabilities Approved for Payment [Member] | AEP Texas Inc. [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
$ 6.8
|
|
8.5
|
|
|
Remaining Refund Period |
|
12 years
|
|
|
|
|
Deferred Investment Tax Credits [Member] | Regulatory Liabilities Currently Not Paying Return [Member] | Regulatory Liabilities Approved for Payment [Member] | Indiana Michigan Power Co [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
$ 22.4
|
|
21.3
|
|
|
Remaining Refund Period |
|
29 years
|
|
|
|
|
Deferred Investment Tax Credits [Member] | Regulatory Liabilities Currently Not Paying Return [Member] | Regulatory Liabilities Approved for Payment [Member] | Public Service Co Of Oklahoma [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
$ 50.8
|
|
51.0
|
|
|
Remaining Refund Period |
|
23 years
|
|
|
|
|
Other Regulatory Liabilities Approved for Payment [Member] | Regulatory Liabilities Currently Paying a Return [Member] | Regulatory Liabilities Approved for Payment [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
$ 33.1
|
|
25.2
|
|
|
Other Regulatory Liabilities Approved for Payment [Member] | Regulatory Liabilities Currently Paying a Return [Member] | Regulatory Liabilities Approved for Payment [Member] | AEP Texas Inc. [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
4.8
|
|
5.3
|
|
|
Other Regulatory Liabilities Approved for Payment [Member] | Regulatory Liabilities Currently Paying a Return [Member] | Regulatory Liabilities Approved for Payment [Member] | Indiana Michigan Power Co [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
21.9
|
|
17.4
|
|
|
Other Regulatory Liabilities Approved for Payment [Member] | Regulatory Liabilities Currently Paying a Return [Member] | Regulatory Liabilities Approved for Payment [Member] | Southwestern Electric Power Co [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
2.4
|
|
2.4
|
|
|
Other Regulatory Liabilities Approved for Payment [Member] | Regulatory Liabilities Currently Not Paying Return [Member] | Regulatory Liabilities Approved for Payment [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
90.9
|
|
82.9
|
|
|
Other Regulatory Liabilities Approved for Payment [Member] | Regulatory Liabilities Currently Not Paying Return [Member] | Regulatory Liabilities Approved for Payment [Member] | AEP Texas Inc. [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
1.1
|
|
1.2
|
|
|
Other Regulatory Liabilities Approved for Payment [Member] | Regulatory Liabilities Currently Not Paying Return [Member] | Regulatory Liabilities Approved for Payment [Member] | Appalachian Power Co [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
15.0
|
|
6.8
|
|
|
Other Regulatory Liabilities Approved for Payment [Member] | Regulatory Liabilities Currently Not Paying Return [Member] | Regulatory Liabilities Approved for Payment [Member] | Indiana Michigan Power Co [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
6.0
|
|
28.4
|
|
|
Other Regulatory Liabilities Approved for Payment [Member] | Regulatory Liabilities Currently Not Paying Return [Member] | Regulatory Liabilities Approved for Payment [Member] | Ohio Power Co [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
0.4
|
|
0.7
|
|
|
Other Regulatory Liabilities Approved for Payment [Member] | Regulatory Liabilities Currently Not Paying Return [Member] | Regulatory Liabilities Approved for Payment [Member] | Public Service Co Of Oklahoma [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
4.3
|
|
1.3
|
|
|
Other Regulatory Liabilities Approved for Payment [Member] | Regulatory Liabilities Currently Not Paying Return [Member] | Regulatory Liabilities Approved for Payment [Member] | Southwestern Electric Power Co [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
1.9
|
|
2.7
|
|
|
Excess Nuclear Decommissioning Funding [Member] | Regulatory Liabilities Currently Not Paying Return [Member] | Regulatory Liabilities Approved for Payment [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
[52] |
1,939.7
|
|
1,476.6
|
|
|
Excess Nuclear Decommissioning Funding [Member] | Regulatory Liabilities Currently Not Paying Return [Member] | Regulatory Liabilities Approved for Payment [Member] | Indiana Michigan Power Co [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
[53] |
1,939.7
|
|
1,476.6
|
|
|
PJM Transmission Enhancement Refund [Member] | Regulatory Liabilities Currently Not Paying Return [Member] | Regulatory Liabilities Approved for Payment [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
$ 42.9
|
|
56.2
|
|
|
Remaining Refund Period |
|
4 years
|
|
|
|
|
PJM Transmission Enhancement Refund [Member] | Regulatory Liabilities Currently Not Paying Return [Member] | Regulatory Liabilities Approved for Payment [Member] | Appalachian Power Co [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
$ 13.0
|
|
16.3
|
|
|
Remaining Refund Period |
|
4 years
|
|
|
|
|
PJM Transmission Enhancement Refund [Member] | Regulatory Liabilities Currently Not Paying Return [Member] | Regulatory Liabilities Approved for Payment [Member] | Indiana Michigan Power Co [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
$ 7.9
|
|
9.9
|
|
|
Remaining Refund Period |
|
4 years
|
|
|
|
|
PJM Transmission Enhancement Refund [Member] | Regulatory Liabilities Currently Not Paying Return [Member] | Regulatory Liabilities Approved for Payment [Member] | Ohio Power Co [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
$ 19.6
|
|
24.5
|
|
|
Remaining Refund Period |
|
4 years
|
|
|
|
|
Transition and Restoration Charges [Member] | Regulatory Liabilities Currently Not Paying Return [Member] | Regulatory Liabilities Approved for Payment [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
$ 26.3
|
|
48.2
|
|
|
Remaining Refund Period |
|
8 years
|
|
|
|
|
Transition and Restoration Charges [Member] | Regulatory Liabilities Currently Not Paying Return [Member] | Regulatory Liabilities Approved for Payment [Member] | AEP Texas Inc. [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
$ 26.3
|
|
48.2
|
|
|
Remaining Refund Period |
|
8 years
|
|
|
|
|
2017-2019 Virginia Triennial Revenue Provision [Member] | Regulatory Liabilities Currently Not Paying Return [Member] | Regulatory Liabilities Approved for Payment [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
$ 41.6
|
|
44.2
|
|
|
Remaining Refund Period |
|
27 years
|
|
|
|
|
2017-2019 Virginia Triennial Revenue Provision [Member] | Regulatory Liabilities Currently Not Paying Return [Member] | Regulatory Liabilities Approved for Payment [Member] | Appalachian Power Co [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
$ 41.6
|
|
44.2
|
|
|
Remaining Refund Period |
|
27 years
|
|
|
|
|
Spent Nuclear Fuel [Member] | Regulatory Liabilities Currently Not Paying Return [Member] | Regulatory Liabilities Approved for Payment [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
[52] |
$ 49.5
|
|
43.1
|
|
|
Spent Nuclear Fuel [Member] | Regulatory Liabilities Currently Not Paying Return [Member] | Regulatory Liabilities Approved for Payment [Member] | Indiana Michigan Power Co [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
[53] |
49.5
|
|
43.1
|
|
|
Peak Demand Reduction/Energy Efficiency [Member] | Regulatory Liabilities Currently Not Paying Return [Member] | Regulatory Liabilities Approved for Payment [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
$ 28.6
|
|
26.3
|
|
|
Remaining Refund Period |
|
2 years
|
|
|
|
|
Peak Demand Reduction/Energy Efficiency [Member] | Regulatory Liabilities Currently Not Paying Return [Member] | Regulatory Liabilities Approved for Payment [Member] | Ohio Power Co [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
$ 22.5
|
|
19.9
|
|
|
Remaining Refund Period |
|
2 years
|
|
|
|
|
Peak Demand Reduction/Energy Efficiency [Member] | Regulatory Liabilities Currently Not Paying Return [Member] | Regulatory Liabilities Approved for Payment [Member] | Southwestern Electric Power Co [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
$ 2.6
|
|
5.2
|
|
|
Remaining Refund Period |
|
2 years
|
|
|
|
|
Peak Demand Reduction/Energy Efficiency [Member] | Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
$ 40.8
|
|
27.0
|
|
|
Remaining Recovery Period |
|
5 years
|
|
|
|
|
Ohio Enhanced Service Reliability Plan [Member] | Regulatory Liabilities Currently Not Paying Return [Member] | Regulatory Liabilities Approved for Payment [Member] | Ohio Power Co [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
$ 0.0
|
|
5.7
|
|
|
Ohio Enhanced Service Reliability Plan [Member] | Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] | Ohio Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
$ 9.5
|
|
0.0
|
|
|
Remaining Recovery Period |
|
2 years
|
|
|
|
|
Income Taxes Subject to Flow Through [Member] | Income Tax Related Regulatory Liabilities [Member] | Regulatory Liabilities Approved for Payment [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
[15] |
$ (1,231.8)
|
|
(1,407.9)
|
|
|
Remaining Refund Period |
|
52 years
|
|
|
|
|
Income Taxes Subject to Flow Through [Member] | Income Tax Related Regulatory Liabilities [Member] | Regulatory Liabilities Approved for Payment [Member] | AEP Texas Inc. [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
[16] |
$ (53.5)
|
|
(52.7)
|
|
|
Remaining Refund Period |
|
35 years
|
|
|
|
|
Income Taxes Subject to Flow Through [Member] | Income Tax Related Regulatory Liabilities [Member] | Regulatory Liabilities Approved for Payment [Member] | AEP Transmission Co [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
[11] |
$ (132.4)
|
|
(117.7)
|
|
|
Remaining Refund Period |
|
36 years
|
|
|
|
|
Income Taxes Subject to Flow Through [Member] | Income Tax Related Regulatory Liabilities [Member] | Regulatory Liabilities Approved for Payment [Member] | Appalachian Power Co [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
[12] |
$ (314.3)
|
|
(356.4)
|
|
|
Remaining Refund Period |
|
23 years
|
|
|
|
|
Income Taxes Subject to Flow Through [Member] | Income Tax Related Regulatory Liabilities [Member] | Regulatory Liabilities Approved for Payment [Member] | Indiana Michigan Power Co [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
[17] |
$ (341.2)
|
|
(332.0)
|
|
|
Remaining Refund Period |
|
20 years
|
|
|
|
|
Income Taxes Subject to Flow Through [Member] | Income Tax Related Regulatory Liabilities [Member] | Regulatory Liabilities Approved for Payment [Member] | Ohio Power Co [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
[18] |
$ (35.2)
|
|
(62.7)
|
|
|
Remaining Refund Period |
|
30 years
|
|
|
|
|
Income Taxes Subject to Flow Through [Member] | Income Tax Related Regulatory Liabilities [Member] | Regulatory Liabilities Approved for Payment [Member] | Public Service Co Of Oklahoma [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
[13] |
$ (11.9)
|
|
(8.3)
|
|
|
Remaining Refund Period |
|
28 years
|
|
|
|
|
Income Taxes Subject to Flow Through [Member] | Income Tax Related Regulatory Liabilities [Member] | Regulatory Liabilities Approved for Payment [Member] | Southwestern Electric Power Co [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
[14] |
$ (285.8)
|
|
(275.5)
|
|
|
Remaining Refund Period |
|
27 years
|
|
|
|
|
Smart Grid Costs [Member] | Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] | Ohio Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
$ 19.3
|
|
19.2
|
|
|
Remaining Recovery Period |
|
2 years
|
|
|
|
|
Distribution Investment Rider [Member] | Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] | Ohio Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
$ 2.1
|
|
7.4
|
|
|
Remaining Recovery Period |
|
2 years
|
|
|
|
|
Red Rock Generating Facility [Member] | Regulatory Assets Currently Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] | Public Service Co Of Oklahoma [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
$ 7.9
|
|
8.2
|
|
|
Remaining Recovery Period |
|
35 years
|
|
|
|
|
Dolet Hills Generating Station and Related Fuel Operations | Southwestern Electric Power Co [Member] |
|
|
|
|
|
|
Effects of Regulation Textuals [Abstract] |
|
|
|
|
|
|
Share of Net Investment in Dolet Hills Power Station |
|
$ 108.0
|
|
|
|
|
Amount of Dolet Hills Fuel Costs Approved to Recover |
|
20.0
|
|
|
|
|
Approved Deferral of Dolet Hills Fuel Costs |
|
30.0
|
|
|
|
|
Pirkey Power Plant and Related Fuel Operations | Southwestern Electric Power Co [Member] |
|
|
|
|
|
|
Effects of Regulation Textuals [Abstract] |
|
|
|
|
|
|
Share of Net Investment in Pirkey Power Plant |
|
207.0
|
|
|
|
|
Pirkey Power Plant and Sabine Unbilled Fixed Costs |
|
91.0
|
|
|
|
|
Dolet Hills Power Station [Member] | Southwestern Electric Power Co [Member] |
|
|
|
|
|
|
Effects of Regulation Textuals [Abstract] |
|
|
|
|
|
|
Revisions in Cash Flow Estimates |
|
21.0
|
|
|
|
|
Asset Impairments and Other Related Charges |
|
12.0
|
|
|
|
|
Dolet Hills Power Station [Member] | Southwestern Electric Power Co [Member] | Regulatory Assets Currently Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
72.0
|
|
|
|
|
Unrealized Gain on Forward Commitments [Member] | Regulatory Liabilities Currently Not Paying Return [Member] | Regulatory Liabilities Approved for Payment [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
$ 37.2
|
|
11.7
|
|
|
Remaining Refund Period |
|
3 years
|
|
|
|
|
Unrealized Gain on Forward Commitments [Member] | Regulatory Liabilities Currently Not Paying Return [Member] | Regulatory Liabilities Approved for Payment [Member] | Appalachian Power Co [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
$ 28.2
|
|
5.5
|
|
|
Remaining Refund Period |
|
3 years
|
|
|
|
|
Unrealized Gain on Forward Commitments [Member] | Regulatory Liabilities Currently Not Paying Return [Member] | Regulatory Liabilities Approved for Payment [Member] | Southwestern Electric Power Co [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
$ 3.7
|
|
0.2
|
|
|
Remaining Refund Period |
|
2 years
|
|
|
|
|
Welsh Plant Unit 2 | Southwestern Electric Power Co [Member] |
|
|
|
|
|
|
Effects of Regulation Textuals [Abstract] |
|
|
|
|
|
|
Impairment Charge Welsh Plant, Unit 2 |
|
$ 7.0
|
|
|
|
|
February 2021 Severe Storm Fuel Costs | Regulatory Assets Currently Earning Return [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Current Regulatory Assets |
[54] |
$ 62.7
|
|
0.0
|
|
|
Remaining Recovery Period |
|
1 year
|
|
|
|
|
February 2021 Severe Storm Fuel Costs | Regulatory Assets Currently Earning Return [Member] | Southwestern Electric Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Current Regulatory Assets |
[55] |
$ 62.7
|
|
0.0
|
|
|
Remaining Recovery Period |
|
1 year
|
|
|
|
|
February 2021 Severe Storm Fuel Costs | Regulatory Assets Currently Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
$ 367.5
|
|
0.0
|
|
|
February 2021 Severe Storm Fuel Costs | Regulatory Assets Currently Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] | Southwestern Electric Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
367.5
|
|
0.0
|
|
|
February 2021 Severe Storm Fuel Costs | Regulatory Assets Currently Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
[56] |
679.3
|
|
0.0
|
|
|
February 2021 Severe Storm Fuel Costs | Regulatory Assets Currently Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] | Public Service Co Of Oklahoma [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
[57] |
679.3
|
|
0.0
|
|
|
Dolet Hills Power Station Fuel Costs - Louisiana | Regulatory Assets Currently Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
30.9
|
|
0.0
|
|
|
Dolet Hills Power Station Fuel Costs - Louisiana | Regulatory Assets Currently Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] | Southwestern Electric Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
30.9
|
|
0.0
|
|
|
Texas Transmission Cost Recovery Factor | Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
$ 30.6
|
|
4.6
|
|
|
Remaining Recovery Period |
|
2 years
|
|
|
|
|
Texas Transmission Cost Recovery Factor | Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] | AEP Texas Inc. [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
$ 30.6
|
|
4.6
|
|
|
Remaining Recovery Period |
|
2 years
|
|
|
|
|
Texas Retail Electric Provider Bad Debt Expense | Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] | AEP Texas Inc. [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
$ 4.1
|
|
0.0
|
|
|
Environmental Compliance Costs | Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] | Appalachian Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
$ 13.7
|
|
0.0
|
|
|
Remaining Recovery Period |
|
2 years
|
|
|
|
|
Rockport Plant Unit 2 Selective Catalytic Reduction | Regulatory Liabilities Currently Not Paying Return [Member] | Regulatory Liabilities Approved for Payment [Member] | Indiana Michigan Power Co [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
$ 10.6
|
|
8.9
|
|
|
Remaining Refund Period |
|
2 years
|
|
|
|
|
Ohio Economic Development Rider | Regulatory Assets Currently Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] | Ohio Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
$ 10.1
|
|
1.3
|
|
|
Remaining Recovery Period |
|
2 years
|
|
|
|
|
PJM Load Service Entity Formula Rate True-Up | Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] | Ohio Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
$ 7.5
|
|
0.0
|
|
|
Remaining Recovery Period |
|
2 years
|
|
|
|
|
Dolet Hills Power Station Fuel Costs - Arkansas | Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] | Southwestern Electric Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
$ 13.0
|
|
0.0
|
|
|
Remaining Recovery Period |
|
5 years
|
|
|
|
|
Vegetation Management - Texas | Regulatory Liabilities Currently Not Paying Return [Member] | Regulatory Liabilities Approved for Payment [Member] | Southwestern Electric Power Co [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
$ 4.8
|
|
$ 0.1
|
|
|
Remaining Refund Period |
|
2 years
|
|
|
|
|
2020 Texas Fuel Reconciliation | Southwestern Electric Power Co [Member] |
|
|
|
|
|
|
Effects of Regulation Textuals [Abstract] |
|
|
|
|
|
|
Amount of Fuel Costs Under Review |
|
$ 1,700.0
|
|
|
|
|
2020 Texas Fuel Reconciliation | Southwestern Electric Power Co [Member] | TEXAS |
|
|
|
|
|
|
Effects of Regulation Textuals [Abstract] |
|
|
|
|
|
|
Amount of Fuel Costs Under Review |
|
616.0
|
|
|
|
|
Recommended Disallowance from Staff or Intervenors |
|
125.0
|
|
|
|
|
Reduction in Recoverable Fuel Costs |
|
10.0
|
|
|
|
|
State Income Tax Rate Changes | Excess ADIT that is Not Subject to Rate Normalization Requirements [Member] | Income Tax Related Regulatory Liabilities [Member] | Regulatory Liabilities Pending Final Regulatory Determination [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
$ 70.0
|
|
|
|
|
|
|