Effects of Regulation (Details) - USD ($) $ in Millions |
12 Months Ended |
Dec. 31, 2020 |
Dec. 31, 2019 |
Dec. 31, 2018 |
Dec. 31, 2017 |
Dec. 31, 2014 |
Regulated Generating Unit to be Retired |
|
|
|
|
|
|
Net Investment |
|
$ 63,901.6
|
$ 60,138.1
|
|
|
|
Materials and Supplies |
|
680.6
|
640.7
|
|
|
|
Annual Depreciation |
|
2,487.5
|
2,203.7
|
$ 1,965.0
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Current Regulatory Assets |
|
90.7
|
92.9
|
|
|
|
Noncurrent Regulatory Assets |
|
3,527.0
|
3,158.8
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Current Regulatory Liabilities |
|
52.6
|
86.6
|
|
|
|
Noncurrent Regulatory Liabilities |
|
8,378.7
|
8,457.6
|
|
|
|
Effects of Regulation Textuals [Abstract] |
|
|
|
|
|
|
Revisions in Cash Flow Estimates |
[1],[2],[3],[4],[5] |
183.1
|
67.0
|
|
|
|
Secured Debt |
|
716.4
|
1,025.1
|
|
|
|
Accumulated Depreciation and Amortization |
|
20,411.4
|
19,007.6
|
|
|
|
Asset Impairments and Other Related Charges |
|
$ 0.0
|
$ 156.4
|
$ 70.6
|
|
|
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |
|
21.00%
|
21.00%
|
21.00%
|
35.00%
|
35.00%
|
AEP Texas Inc. [Member] |
|
|
|
|
|
|
Regulated Generating Unit to be Retired |
|
|
|
|
|
|
Net Investment |
|
$ 9,813.6
|
$ 8,845.1
|
|
|
|
Materials and Supplies |
|
70.0
|
56.7
|
|
|
|
Annual Depreciation |
|
364.2
|
365.9
|
$ 262.2
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
266.8
|
280.6
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
1,270.8
|
1,316.9
|
|
|
|
Effects of Regulation Textuals [Abstract] |
|
|
|
|
|
|
Revisions in Cash Flow Estimates |
[2],[3],[5] |
(16.8)
|
0.1
|
|
|
|
Secured Debt |
|
492.6
|
776.8
|
|
|
|
Accumulated Depreciation and Amortization |
|
1,529.3
|
1,758.1
|
|
|
|
Asset Impairments and Other Related Charges |
|
$ 0.0
|
$ 32.5
|
$ 0.0
|
|
|
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |
|
21.00%
|
21.00%
|
21.00%
|
35.00%
|
|
AEP Transmission Co [Member] |
|
|
|
|
|
|
Regulated Generating Unit to be Retired |
|
|
|
|
|
|
Net Investment |
|
$ 10,772.8
|
$ 9,490.9
|
|
|
|
Materials and Supplies |
|
8.5
|
13.8
|
|
|
|
Annual Depreciation |
|
249.0
|
176.0
|
$ 133.9
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
15.1
|
4.2
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
581.8
|
540.9
|
|
|
|
Effects of Regulation Textuals [Abstract] |
|
|
|
|
|
|
Accumulated Depreciation and Amortization |
|
$ 572.8
|
$ 402.3
|
|
|
|
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |
|
21.00%
|
21.00%
|
21.00%
|
35.00%
|
|
Appalachian Power Co [Member] |
|
|
|
|
|
|
Regulated Generating Unit to be Retired |
|
|
|
|
|
|
Net Investment |
|
$ 11,394.1
|
$ 11,081.9
|
|
|
|
Materials and Supplies |
|
99.6
|
105.2
|
|
|
|
Annual Depreciation |
|
507.8
|
466.5
|
$ 428.1
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Current Regulatory Assets |
|
5.3
|
42.5
|
|
|
|
Noncurrent Regulatory Assets |
|
686.3
|
457.2
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
1,224.7
|
1,268.7
|
|
|
|
Effects of Regulation Textuals [Abstract] |
|
|
|
|
|
|
Revisions in Cash Flow Estimates |
[2],[3],[5] |
200.9
|
6.7
|
|
|
|
Secured Debt |
|
223.8
|
248.3
|
|
|
|
Accumulated Depreciation and Amortization |
|
4,716.2
|
4,432.3
|
|
|
|
Asset Impairments and Other Related Charges |
|
$ 0.0
|
$ 92.9
|
$ 0.0
|
|
|
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |
|
21.00%
|
21.00%
|
21.00%
|
35.00%
|
|
Indiana Michigan Power Co [Member] |
|
|
|
|
|
|
Regulated Generating Unit to be Retired |
|
|
|
|
|
|
Net Investment |
|
$ 7,052.3
|
$ 6,899.7
|
|
|
|
Materials and Supplies |
|
175.8
|
171.3
|
|
|
|
Annual Depreciation |
|
393.3
|
330.6
|
$ 278.9
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Current Regulatory Assets |
|
5.4
|
3.0
|
|
|
|
Noncurrent Regulatory Assets |
|
404.8
|
482.1
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Current Regulatory Liabilities |
|
20.8
|
6.1
|
|
|
|
Noncurrent Regulatory Liabilities |
|
2,041.9
|
1,891.4
|
|
|
|
Effects of Regulation Textuals [Abstract] |
|
|
|
|
|
|
Revisions in Cash Flow Estimates |
[2],[3],[4],[5] |
(4.9)
|
0.1
|
|
|
|
Accumulated Depreciation and Amortization |
|
$ 3,552.5
|
$ 3,294.3
|
|
|
|
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |
|
21.00%
|
21.00%
|
21.00%
|
35.00%
|
|
Ohio Power Co [Member] |
|
|
|
|
|
|
Regulated Generating Unit to be Retired |
|
|
|
|
|
|
Net Investment |
|
$ 7,452.1
|
$ 6,907.0
|
|
|
|
Materials and Supplies |
|
66.9
|
52.3
|
|
|
|
Annual Depreciation |
|
275.0
|
229.4
|
$ 232.6
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
385.8
|
351.8
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Current Regulatory Liabilities |
|
3.9
|
2.8
|
|
|
|
Noncurrent Regulatory Liabilities |
|
1,005.2
|
1,090.9
|
|
|
|
Effects of Regulation Textuals [Abstract] |
|
|
|
|
|
|
Revisions in Cash Flow Estimates |
[2],[5] |
0.0
|
0.2
|
|
|
|
Accumulated Depreciation and Amortization |
|
$ 2,350.0
|
$ 2,263.0
|
|
|
|
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |
|
21.00%
|
21.00%
|
21.00%
|
35.00%
|
|
Public Service Co Of Oklahoma [Member] |
|
|
|
|
|
|
Regulated Generating Unit to be Retired |
|
|
|
|
|
|
Net Investment |
|
$ 4,320.0
|
$ 4,103.3
|
|
|
|
Materials and Supplies |
|
54.0
|
46.8
|
|
|
|
Annual Depreciation |
|
171.9
|
162.5
|
$ 155.5
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Current Regulatory Assets |
|
30.1
|
0.0
|
|
|
|
Noncurrent Regulatory Assets |
|
375.0
|
375.2
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Current Regulatory Liabilities |
|
0.0
|
63.9
|
|
|
|
Noncurrent Regulatory Liabilities |
|
802.2
|
837.2
|
|
|
|
Effects of Regulation Textuals [Abstract] |
|
|
|
|
|
|
Revisions in Cash Flow Estimates |
[2],[3],[5] |
(4.8)
|
2.6
|
|
|
|
Accumulated Depreciation and Amortization |
|
$ 1,605.6
|
$ 1,580.1
|
|
|
|
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |
|
21.00%
|
21.00%
|
21.00%
|
35.00%
|
|
Southwestern Electric Power Co [Member] |
|
|
|
|
|
|
Regulated Generating Unit to be Retired |
|
|
|
|
|
|
Net Investment |
|
$ 7,088.2
|
$ 7,095.2
|
|
|
|
Materials and Supplies |
|
95.8
|
94.0
|
|
|
|
Annual Depreciation |
|
271.2
|
247.9
|
$ 237.0
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Current Regulatory Assets |
|
2.6
|
4.9
|
|
|
|
Noncurrent Regulatory Assets |
|
403.1
|
222.4
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Current Regulatory Liabilities |
|
37.6
|
13.6
|
|
|
|
Noncurrent Regulatory Liabilities |
|
863.4
|
892.3
|
|
|
|
Effects of Regulation Textuals [Abstract] |
|
|
|
|
|
|
Revisions in Cash Flow Estimates |
[1],[2],[3],[5] |
10.1
|
6.9
|
|
|
|
Accumulated Depreciation and Amortization |
|
$ 3,158.5
|
$ 2,873.7
|
|
|
|
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |
|
21.00%
|
21.00%
|
21.00%
|
35.00%
|
|
Amount of Fuel Costs Under Review |
|
$ 1,700.0
|
|
|
|
|
Net Over-Recovered Fuel Costs |
|
35.0
|
|
|
|
|
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
|
|
|
|
|
Regulatory Liabilities Approved for Payment [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
7,889.8
|
$ 7,594.6
|
|
|
|
Regulatory Liabilities Approved for Payment [Member] | AEP Texas Inc. [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
1,276.5
|
954.9
|
|
|
|
Regulatory Liabilities Approved for Payment [Member] | AEP Transmission Co [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
581.8
|
540.9
|
|
|
|
Regulatory Liabilities Approved for Payment [Member] | Appalachian Power Co [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
1,224.7
|
1,268.7
|
|
|
|
Regulatory Liabilities Approved for Payment [Member] | Indiana Michigan Power Co [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
2,041.9
|
1,891.4
|
|
|
|
Regulatory Liabilities Approved for Payment [Member] | Ohio Power Co [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
1,005.0
|
1,090.7
|
|
|
|
Regulatory Liabilities Approved for Payment [Member] | Public Service Co Of Oklahoma [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
802.2
|
837.2
|
|
|
|
Regulatory Liabilities Approved for Payment [Member] | Southwestern Electric Power Co [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
550.0
|
572.6
|
|
|
|
Regulatory Liabilities Pending Final Regulatory Determination [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
488.9
|
863.0
|
|
|
|
Regulatory Liabilities Pending Final Regulatory Determination [Member] | AEP Texas Inc. [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
(5.7)
|
362.0
|
|
|
|
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] | Southwestern Electric Power Co [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
[6] |
313.4
|
319.7
|
|
|
|
Regulatory Liabilities Currently Paying a Return [Member] | Regulatory Liabilities Approved for Payment [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
3,091.2
|
2,934.5
|
|
|
|
Regulatory Liabilities Currently Paying a Return [Member] | Regulatory Liabilities Approved for Payment [Member] | AEP Texas Inc. [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
723.6
|
699.7
|
|
|
|
Regulatory Liabilities Currently Paying a Return [Member] | Regulatory Liabilities Approved for Payment [Member] | AEP Transmission Co [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
198.6
|
141.0
|
|
|
|
Regulatory Liabilities Currently Paying a Return [Member] | Regulatory Liabilities Approved for Payment [Member] | Appalachian Power Co [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
679.2
|
635.8
|
|
|
|
Regulatory Liabilities Currently Paying a Return [Member] | Regulatory Liabilities Approved for Payment [Member] | Indiana Michigan Power Co [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
185.6
|
167.0
|
|
|
|
Regulatory Liabilities Currently Paying a Return [Member] | Regulatory Liabilities Approved for Payment [Member] | Ohio Power Co [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
458.4
|
484.8
|
|
|
|
Regulatory Liabilities Currently Paying a Return [Member] | Regulatory Liabilities Approved for Payment [Member] | Public Service Co Of Oklahoma [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
289.9
|
286.8
|
|
|
|
Regulatory Liabilities Currently Paying a Return [Member] | Regulatory Liabilities Approved for Payment [Member] | Southwestern Electric Power Co [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
473.3
|
456.2
|
|
|
|
Regulatory Liabilities Currently Paying a Return [Member] | Regulatory Liabilities Pending Final Regulatory Determination [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
2.5
|
0.0
|
|
|
|
Regulatory Liabilities Currently Paying a Return [Member] | Regulatory Liabilities Pending Final Regulatory Determination [Member] | AEP Texas Inc. [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
2.5
|
0.0
|
|
|
|
Regulatory Liabilities Currently Not Paying Return [Member] | Regulatory Liabilities Approved for Payment [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
2,005.9
|
1,808.4
|
|
|
|
Regulatory Liabilities Currently Not Paying Return [Member] | Regulatory Liabilities Approved for Payment [Member] | AEP Texas Inc. [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
57.9
|
64.9
|
|
|
|
Regulatory Liabilities Currently Not Paying Return [Member] | Regulatory Liabilities Approved for Payment [Member] | Appalachian Power Co [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
72.8
|
65.6
|
|
|
|
Regulatory Liabilities Currently Not Paying Return [Member] | Regulatory Liabilities Approved for Payment [Member] | Indiana Michigan Power Co [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
1,601.5
|
1,370.0
|
|
|
|
Regulatory Liabilities Currently Not Paying Return [Member] | Regulatory Liabilities Approved for Payment [Member] | Ohio Power Co [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
50.8
|
81.7
|
|
|
|
Regulatory Liabilities Currently Not Paying Return [Member] | Regulatory Liabilities Approved for Payment [Member] | Public Service Co Of Oklahoma [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
52.3
|
56.2
|
|
|
|
Regulatory Liabilities Currently Not Paying Return [Member] | Regulatory Liabilities Approved for Payment [Member] | Southwestern Electric Power Co [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
8.2
|
10.8
|
|
|
|
Regulatory Liabilities Currently Not Paying Return [Member] | Regulatory Liabilities Pending Final Regulatory Determination [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
1.5
|
0.2
|
|
|
|
Income Tax Related Regulatory Liabilities [Member] | Regulatory Liabilities Approved for Payment [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
[7] |
2,792.7
|
2,851.7
|
|
|
|
Income Tax Related Regulatory Liabilities [Member] | Regulatory Liabilities Approved for Payment [Member] | AEP Texas Inc. [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
[8] |
495.0
|
190.3
|
|
|
|
Income Tax Related Regulatory Liabilities [Member] | Regulatory Liabilities Approved for Payment [Member] | AEP Transmission Co [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
[9] |
383.2
|
399.9
|
|
|
|
Income Tax Related Regulatory Liabilities [Member] | Regulatory Liabilities Approved for Payment [Member] | Appalachian Power Co [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
[10] |
472.7
|
567.3
|
|
|
|
Income Tax Related Regulatory Liabilities [Member] | Regulatory Liabilities Approved for Payment [Member] | Indiana Michigan Power Co [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
[11] |
254.8
|
354.4
|
|
|
|
Income Tax Related Regulatory Liabilities [Member] | Regulatory Liabilities Approved for Payment [Member] | Ohio Power Co [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
[12] |
495.8
|
524.2
|
|
|
|
Income Tax Related Regulatory Liabilities [Member] | Regulatory Liabilities Approved for Payment [Member] | Public Service Co Of Oklahoma [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
[13] |
460.0
|
494.2
|
|
|
|
Income Tax Related Regulatory Liabilities [Member] | Regulatory Liabilities Approved for Payment [Member] | Southwestern Electric Power Co [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
[6] |
68.5
|
105.6
|
|
|
|
Income Tax Related Regulatory Liabilities [Member] | Regulatory Liabilities Pending Final Regulatory Determination [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
[7] |
484.9
|
862.8
|
|
|
|
Income Tax Related Regulatory Liabilities [Member] | Regulatory Liabilities Pending Final Regulatory Determination [Member] | AEP Texas Inc. [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
[14] |
(8.2)
|
362.0
|
|
|
|
Regulatory Assets Pending Final Regulatory Approval [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
442.2
|
181.7
|
|
|
|
Regulatory Assets Pending Final Regulatory Approval [Member] | AEP Texas Inc. [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
32.9
|
30.8
|
|
|
|
Regulatory Assets Pending Final Regulatory Approval [Member] | Appalachian Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
43.8
|
30.6
|
|
|
|
Regulatory Assets Pending Final Regulatory Approval [Member] | Indiana Michigan Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
4.3
|
7.7
|
|
|
|
Regulatory Assets Pending Final Regulatory Approval [Member] | Ohio Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
8.4
|
0.1
|
|
|
|
Regulatory Assets Pending Final Regulatory Approval [Member] | Public Service Co Of Oklahoma [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
50.5
|
34.6
|
|
|
|
Regulatory Assets Pending Final Regulatory Approval [Member] | Southwestern Electric Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
247.3
|
46.3
|
|
|
|
Regulatory Assets Approved for Recovery [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
3,084.8
|
2,977.1
|
|
|
|
Regulatory Assets Approved for Recovery [Member] | AEP Texas Inc. [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
233.9
|
249.8
|
|
|
|
Regulatory Assets Approved for Recovery [Member] | AEP Transmission Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
15.1
|
4.2
|
|
|
|
Regulatory Assets Approved for Recovery [Member] | Appalachian Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
642.5
|
426.6
|
|
|
|
Regulatory Assets Approved for Recovery [Member] | Indiana Michigan Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
400.5
|
474.4
|
|
|
|
Regulatory Assets Approved for Recovery [Member] | Ohio Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
377.4
|
351.7
|
|
|
|
Regulatory Assets Approved for Recovery [Member] | Public Service Co Of Oklahoma [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
324.5
|
340.6
|
|
|
|
Regulatory Assets Approved for Recovery [Member] | Southwestern Electric Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
155.8
|
176.1
|
|
|
|
Regulatory Assets Currently Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
220.7
|
93.5
|
|
|
|
Regulatory Assets Currently Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] | AEP Texas Inc. [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
16.3
|
0.0
|
|
|
|
Regulatory Assets Currently Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] | Appalachian Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
3.7
|
0.5
|
|
|
|
Regulatory Assets Currently Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] | Indiana Michigan Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
0.5
|
0.0
|
|
|
|
Regulatory Assets Currently Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] | Public Service Co Of Oklahoma [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
34.4
|
27.4
|
|
|
|
Regulatory Assets Currently Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] | Southwestern Electric Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
124.4
|
35.4
|
|
|
|
Regulatory Assets Currently Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
1,131.4
|
1,089.2
|
|
|
|
Regulatory Assets Currently Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] | AEP Texas Inc. [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
29.3
|
61.7
|
|
|
|
Regulatory Assets Currently Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] | Appalachian Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
123.4
|
86.9
|
|
|
|
Regulatory Assets Currently Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] | Indiana Michigan Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
298.4
|
296.4
|
|
|
|
Regulatory Assets Currently Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] | Ohio Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
60.2
|
31.4
|
|
|
|
Regulatory Assets Currently Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] | Public Service Co Of Oklahoma [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
253.7
|
255.3
|
|
|
|
Regulatory Assets Currently Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] | Southwestern Electric Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
33.6
|
37.2
|
|
|
|
Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
221.5
|
88.2
|
|
|
|
Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] | AEP Texas Inc. [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
16.6
|
30.8
|
|
|
|
Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] | Appalachian Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
40.1
|
30.1
|
|
|
|
Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] | Indiana Michigan Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
3.8
|
7.7
|
|
|
|
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 |
|
16.1
|
7.2
|
|
|
|
Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] | Southwestern Electric Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
122.9
|
10.9
|
|
|
|
Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
1,953.4
|
1,887.9
|
|
|
|
Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] | AEP Texas Inc. [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
204.6
|
188.1
|
|
|
|
Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] | Appalachian Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
519.1
|
339.7
|
|
|
|
Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] | Indiana Michigan Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
102.1
|
178.0
|
|
|
|
Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] | Ohio Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
317.2
|
320.3
|
|
|
|
Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] | Public Service Co Of Oklahoma [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
70.8
|
85.3
|
|
|
|
Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] | Southwestern Electric Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
122.2
|
138.9
|
|
|
|
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 |
|
198.4
|
|
|
|
|
Accelerated Depreciation Regulatory Asset |
|
110.4
|
|
|
|
|
Cost of Removal Regulatory Liability |
[15] |
$ 19.8
|
|
|
|
|
Expected Retirement Date |
|
2026
|
|
|
|
|
Annual Depreciation |
[16] |
$ 14.9
|
|
|
|
|
Dolet Hills Power Station [Member] | Generating Units Probable of Abandonment [Member] | Southwestern Electric Power Co [Member] |
|
|
|
|
|
|
Regulated Generating Unit to be Retired |
|
|
|
|
|
|
Net Investment |
|
74.4
|
|
|
|
|
Accelerated Depreciation Regulatory Asset |
|
71.2
|
|
|
|
|
Cost of Removal Regulatory Liability |
|
$ 24.0
|
|
|
|
|
Expected Retirement Date |
|
2021
|
|
|
|
|
Annual Depreciation |
[16] |
$ 60.8
|
|
|
|
|
Pirkey Power Plant [Member] | Generating Units Probable of Abandonment [Member] | Southwestern Electric Power Co [Member] |
|
|
|
|
|
|
Regulated Generating Unit to be Retired |
|
|
|
|
|
|
Net Investment |
|
199.5
|
|
|
|
|
Accelerated Depreciation Regulatory Asset |
|
12.2
|
|
|
|
|
Cost of Removal Regulatory Liability |
|
$ 38.7
|
|
|
|
|
Expected Retirement Date |
|
2023
|
|
|
|
|
Annual Depreciation |
[16] |
$ 13.8
|
|
|
|
|
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 |
|
549.8
|
|
|
|
|
Accelerated Depreciation Regulatory Asset |
|
3.6
|
|
|
|
|
Cost of Removal Regulatory Liability |
[17] |
$ 57.6
|
|
|
|
|
Expected Retirement Date |
|
2028
|
|
|
|
|
Annual Depreciation |
[16] |
$ 33.3
|
|
|
|
|
Deferred Fuel Costs [Member] | Regulatory Liabilities Currently Paying a Return [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Current Regulatory Liabilities |
|
$ 27.6
|
77.5
|
|
|
|
Remaining Refund Period |
|
1 year
|
|
|
|
|
Deferred Fuel Costs [Member] | Regulatory Liabilities Currently Paying a Return [Member] | Public Service Co Of Oklahoma [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Current Regulatory Liabilities |
|
$ 0.0
|
63.9
|
|
|
|
Remaining Refund Period |
|
|
|
|
|
|
Deferred Fuel Costs [Member] | Regulatory Liabilities Currently Paying a Return [Member] | Southwestern Electric Power Co [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Current Regulatory Liabilities |
[18] |
$ 37.6
|
13.6
|
|
|
|
Remaining Refund Period |
[18] |
1 year
|
|
|
|
|
Deferred Fuel Costs [Member] | Regulatory Liabilities Currently Not Paying Return [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Current Regulatory Liabilities |
|
$ 25.0
|
9.1
|
|
|
|
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 |
|
$ 20.8
|
6.1
|
|
|
|
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 |
|
$ 3.9
|
2.8
|
|
|
|
Remaining Refund Period |
|
1 year
|
|
|
|
|
Deferred Fuel Costs [Member] | Regulatory Assets Currently Earning Return [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Current Regulatory Assets |
|
$ 41.4
|
44.7
|
|
|
|
Remaining Recovery Period |
|
1 year
|
|
|
|
|
Deferred Fuel Costs [Member] | Regulatory Assets Currently Earning Return [Member] | Appalachian Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Current Regulatory Assets |
|
$ 3.3
|
36.8
|
|
|
|
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 |
|
$ 5.4
|
3.0
|
|
|
|
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 |
|
$ 30.1
|
0.0
|
|
|
|
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 |
[19] |
$ 2.6
|
4.9
|
|
|
|
Remaining Recovery Period |
|
1 year
|
|
|
|
|
Deferred Fuel Costs [Member] | Regulatory Assets Currently Not Earning Return [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Current Regulatory Assets |
|
$ 49.3
|
48.2
|
|
|
|
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 |
|
$ 2.0
|
5.7
|
|
|
|
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 |
|
$ 71.2
|
0.0
|
|
|
|
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 |
|
71.2
|
0.0
|
|
|
|
Kentucky Deferred Purchase Power Expenses [Member] | Regulatory Assets Currently Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
41.3
|
30.2
|
|
|
|
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] | Southwestern Electric Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
12.2
|
0.0
|
|
|
|
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 |
|
3.6
|
0.0
|
|
|
|
Oklaunion Power Station Accelerated Depreciation [Member] | Regulatory Assets Currently Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
34.4
|
27.4
|
|
|
|
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 |
|
34.4
|
27.4
|
|
|
|
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 |
|
3.7
|
0.0
|
|
|
|
Plant Retirement Costs - Materials and Supplies [Member] | Regulatory Assets Currently Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] | Appalachian Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
0.0
|
0.5
|
|
|
|
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 |
|
38.6
|
0.7
|
|
|
|
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 |
|
0.5
|
0.0
|
|
|
|
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 |
|
2.2
|
0.2
|
|
|
|
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 |
|
32.7
|
21.5
|
|
|
|
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 |
|
2.3
|
1.4
|
|
|
|
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 |
|
3.4
|
0.0
|
|
|
|
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 |
|
0.0
|
0.1
|
|
|
|
Other Regulatory Assets Pending Final Regulatory Approval [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
|
0.1
|
|
|
|
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 |
|
14.5
|
3.7
|
|
|
|
Storm Related Costs [Member] | Regulatory Assets Currently Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
$ 11.5
|
21.3
|
|
|
|
Remaining Recovery Period |
|
2 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 |
|
$ 11.5
|
21.3
|
|
|
|
Remaining Recovery Period |
|
2 years
|
|
|
|
|
Storm Related Costs [Member] | Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
$ 134.2
|
7.2
|
|
|
|
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 |
|
4.0
|
0.0
|
|
|
|
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 |
|
15.8
|
7.2
|
|
|
|
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 |
|
99.3
|
0.0
|
|
|
|
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 |
|
$ 17.1
|
0.0
|
|
|
|
Remaining Recovery Period |
|
4 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 |
|
$ 107.1
|
87.4
|
|
|
|
Remaining Recovery Period |
|
20 years
|
|
|
|
|
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
|
30.1
|
|
|
|
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
|
30.1
|
|
|
|
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 |
|
$ 212.7
|
28.8
|
|
|
|
Remaining Recovery Period |
|
22 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 |
|
$ 202.7
|
0.0
|
|
|
|
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 |
|
$ 9.3
|
0.0
|
|
|
|
COVID-19 - West 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 |
|
1.5
|
0.0
|
|
|
|
COVID-19 [Member] | Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
24.9
|
0.0
|
|
|
|
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 |
|
10.5
|
0.0
|
|
|
|
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 |
|
3.8
|
0.0
|
|
|
|
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 |
|
4.4
|
0.0
|
|
|
|
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
|
0.0
|
|
|
|
Vegetation Management - AEP Texas [Member] | Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
3.8
|
29.4
|
|
|
|
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 |
|
3.8
|
29.4
|
|
|
|
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 |
|
$ 22.4
|
0.0
|
|
|
|
Remaining Recovery Period |
|
5 years
|
|
|
|
|
Plant Retirement Costs - Unrecovered Plant [Member] | Regulatory Assets Currently Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
[20] |
$ 713.1
|
690.5
|
|
|
|
Remaining Recovery Period |
[20] |
23 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 |
[21] |
$ 122.4
|
86.4
|
|
|
|
Remaining Recovery Period |
[21] |
23 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 |
|
$ 191.5
|
214.9
|
|
|
|
Remaining Recovery Period |
|
8 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 |
[22] |
$ 180.8
|
167.0
|
|
|
|
Remaining Recovery Period |
[22] |
20 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 |
|
$ 14.4
|
15.1
|
|
|
|
Remaining Recovery Period |
|
22 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 |
|
$ 16.1
|
16.6
|
|
|
|
Remaining Recovery Period |
|
21 years
|
|
|
|
|
Meter Replacement Costs [Member] | Regulatory Assets Currently Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
$ 55.5
|
65.4
|
|
|
|
Remaining Recovery Period |
|
7 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 |
|
$ 29.3
|
35.2
|
|
|
|
Remaining Recovery Period |
|
6 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 |
|
$ 26.2
|
30.2
|
|
|
|
Remaining Recovery Period |
|
7 years
|
|
|
|
|
Ohio Distribution Decoupling [Member] | Regulatory Assets Currently Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
$ 46.6
|
31.4
|
|
|
|
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 |
|
$ 46.6
|
31.4
|
|
|
|
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 |
|
$ 12.3
|
0.0
|
|
|
|
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 |
|
$ 38.6
|
41.0
|
|
|
|
Remaining Recovery Period |
|
20 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 |
|
$ 26.5
|
27.8
|
|
|
|
Remaining Recovery Period |
|
20 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 |
|
$ 12.1
|
13.2
|
|
|
|
Remaining Recovery Period |
|
12 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 |
|
$ 34.4
|
13.5
|
|
|
|
Remaining Recovery Period |
|
8 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 |
|
$ 34.4
|
13.5
|
|
|
|
Remaining Recovery Period |
|
8 years
|
|
|
|
|
Cook Plant Uprate Project [Member] | Regulatory Assets Currently Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
$ 30.2
|
32.6
|
|
|
|
Remaining Recovery Period |
|
13 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 |
|
$ 30.2
|
32.6
|
|
|
|
Remaining Recovery Period |
|
13 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 |
|
$ 16.3
|
0.0
|
|
|
|
Advanced Metering System [Member] | Regulatory Assets Currently Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
0.0
|
26.5
|
|
|
|
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 |
|
0.0
|
26.5
|
|
|
|
Other Regulatory Assets Approved for Recovery [Member] | Regulatory Assets Currently Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
94.4
|
79.6
|
|
|
|
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 |
|
1.0
|
0.5
|
|
|
|
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 |
|
7.0
|
6.9
|
|
|
|
Other Regulatory Assets Approved for Recovery [Member] | Regulatory Assets Currently Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] | Ohio Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
1.3
|
0.0
|
|
|
|
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 |
|
0.5
|
0.6
|
|
|
|
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 |
|
7.1
|
8.9
|
|
|
|
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 |
|
181.4
|
132.8
|
|
|
|
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 |
|
12.4
|
12.6
|
|
|
|
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 |
|
12.7
|
14.4
|
|
|
|
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 |
|
16.3
|
22.3
|
|
|
|
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 |
|
15.8
|
15.7
|
|
|
|
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 |
|
12.4
|
5.4
|
|
|
|
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 |
|
17.0
|
19.7
|
|
|
|
Vegetation Management [Member] | Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
$ 67.8
|
43.6
|
|
|
|
Remaining Recovery Period |
|
5 years
|
|
|
|
|
Cook Plant Study Costs [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 |
|
$ 0.0
|
7.6
|
|
|
|
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 |
|
9.1
|
7.2
|
|
|
|
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 |
|
$ 14.1
|
15.1
|
|
|
|
Remaining Recovery Period |
|
14 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 |
|
$ 10.1
|
0.0
|
|
|
|
Remaining Recovery Period |
|
15 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 |
|
$ 11.1
|
13.4
|
|
|
|
Remaining Recovery Period |
|
18 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 |
|
$ 1,088.6
|
1,309.8
|
|
|
|
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 |
|
$ 145.0
|
172.0
|
|
|
|
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 |
|
$ 114.4
|
160.8
|
|
|
|
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 |
|
$ 25.7
|
67.5
|
|
|
|
Remaining Recovery Period |
|
12 years
|
|
|
|
|
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 |
|
$ 130.7
|
167.3
|
|
|
|
Remaining Recovery Period |
|
12 years
|
|
|
|
|
Pension and OPEB Funded Status [Member] | Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] | Public Service Co Of Oklahoma [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
$ 52.3
|
73.4
|
|
|
|
Remaining Recovery Period |
|
12 years
|
|
|
|
|
Pension and OPEB Funded Status [Member] | Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] | Southwestern Electric Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
$ 89.1
|
102.6
|
|
|
|
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 |
|
$ 120.0
|
129.0
|
|
|
|
Remaining Recovery Period |
|
28 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 |
|
$ 82.1
|
85.5
|
|
|
|
Remaining Recovery Period |
|
25 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 |
|
$ 15.7
|
17.2
|
|
|
|
Remaining Recovery Period |
|
28 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 |
|
$ 6.1
|
6.5
|
|
|
|
Remaining Recovery Period |
|
18 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 |
|
$ 7.7
|
3.5
|
|
|
|
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 |
|
$ 16.8
|
19.5
|
|
|
|
Remaining Recovery Period |
|
6 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 |
|
$ 111.3
|
106.8
|
|
|
|
Remaining Recovery Period |
|
12 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 |
|
$ 110.0
|
103.6
|
|
|
|
Remaining Recovery Period |
|
12 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 |
|
$ 18.8
|
0.0
|
|
|
|
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 |
|
$ 45.4
|
43.6
|
|
|
|
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 |
|
$ 39.5
|
63.8
|
|
|
|
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] | Indiana Michigan Power Co [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
$ 39.5
|
63.8
|
|
|
|
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] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
$ 33.0
|
7.3
|
|
|
|
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 |
|
$ 15.1
|
4.2
|
|
|
|
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
|
34.2
|
|
|
|
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 |
|
$ 13.5
|
15.9
|
|
|
|
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 |
|
$ 4.9
|
7.2
|
|
|
|
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 |
|
$ 6.7
|
7.6
|
|
|
|
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 |
|
$ 12.7
|
0.0
|
|
|
|
Remaining Recovery 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 |
|
$ 27.4
|
1.5
|
|
|
|
Remaining Recovery Period |
|
2 years
|
|
|
|
|
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 |
|
$ 27.4
|
1.5
|
|
|
|
Remaining Recovery Period |
|
2 years
|
|
|
|
|
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 |
|
$ 24.0
|
7.1
|
|
|
|
Remaining Recovery Period |
|
2 years
|
|
|
|
|
Medicare Subsidy [Member] | Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Approved for Recovery [Member] |
|
|
|
|
|
|
Regulatory Assets |
|
|
|
|
|
|
Noncurrent Regulatory Assets |
|
$ 18.6
|
23.2
|
|
|
|
Remaining Recovery Period |
|
4 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 |
|
$ 13.3
|
17.0
|
|
|
|
Remaining Refund 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 |
|
$ 2.5
|
0.0
|
|
|
|
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 |
|
2.5
|
0.0
|
|
|
|
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 |
|
1.5
|
0.2
|
|
|
|
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 |
[7],[23] |
3,485.7
|
3,303.0
|
|
|
|
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 |
[8],[24] |
506.0
|
236.5
|
|
|
|
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 |
[9],[25] |
531.5
|
535.7
|
|
|
|
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 |
[10],[26] |
690.0
|
718.9
|
|
|
|
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 |
[11],[27] |
450.6
|
470.9
|
|
|
|
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 |
[12],[28] |
334.6
|
341.6
|
|
|
|
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],[29] |
397.0
|
405.8
|
|
|
|
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 |
[6],[30] |
332.5
|
339.4
|
|
|
|
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 |
[7] |
291.6
|
571.8
|
|
|
|
Excess ADIT Associated with Certain Depreciable Property [Member] | Income Tax Related Regulatory Liabilities [Member] | Regulatory Liabilities Pending Final Regulatory Determination [Member] | AEP Texas Inc. [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
[14] |
0.0
|
274.9
|
|
|
|
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 |
[6] |
291.6
|
297.0
|
|
|
|
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 |
[7] |
$ 714.9
|
890.5
|
|
|
|
Remaining Refund Period |
|
10 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 |
[8] |
$ 41.7
|
0.0
|
|
|
|
Remaining Refund Period |
|
1 year
|
|
|
|
|
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 |
[9] |
$ (30.6)
|
(35.4)
|
|
|
|
Remaining Refund Period |
|
8 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 |
[10] |
$ 139.1
|
210.7
|
|
|
|
Remaining Refund Period |
|
8 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 |
[11] |
$ 136.2
|
184.5
|
|
|
|
Remaining Refund Period |
|
4 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 |
[12] |
$ 223.9
|
252.3
|
|
|
|
Remaining Refund Period |
|
8 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] |
$ 71.3
|
96.3
|
|
|
|
Remaining Refund Period |
|
4 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 |
[6],[31] |
$ 11.5
|
27.8
|
|
|
|
Excess ADIT that is Not Subject to Rate Normalization Requirements [Member] | Income Tax Related Regulatory Liabilities [Member] | Regulatory Liabilities Pending Final Regulatory Determination [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
[7],[32] |
193.3
|
291.0
|
|
|
|
Excess ADIT that is Not Subject to Rate Normalization Requirements [Member] | Income Tax Related Regulatory Liabilities [Member] | Regulatory Liabilities Pending Final Regulatory Determination [Member] | AEP Texas Inc. [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
[14] |
(8.2)
|
87.1
|
|
|
|
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 |
[6] |
21.8
|
22.7
|
|
|
|
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
|
172.0
|
|
|
|
Asset Removal Costs [Member] | Regulatory Liabilities Currently Paying a Return [Member] | Regulatory Liabilities Approved for Payment [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
[33] |
3,061.9
|
2,876.7
|
|
|
|
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 |
[34] |
718.3
|
689.6
|
|
|
|
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 |
[35] |
198.6
|
141.0
|
|
|
|
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 |
[36] |
678.9
|
635.3
|
|
|
|
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 |
[37] |
168.2
|
166.7
|
|
|
|
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 |
[38] |
458.4
|
446.3
|
|
|
|
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 |
[39] |
289.9
|
286.8
|
|
|
|
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 |
[40] |
470.9
|
453.4
|
|
|
|
Ohio Basic Transmission Cost Rider [Member] | Regulatory Liabilities Currently Paying a Return [Member] | Regulatory Liabilities Approved for Payment [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
0.0
|
37.2
|
|
|
|
Ohio Basic Transmission Cost Rider [Member] | Regulatory Liabilities Currently Paying a Return [Member] | Regulatory Liabilities Approved for Payment [Member] | Ohio Power Co [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
0.0
|
37.2
|
|
|
|
Deferred Investment Tax Credits [Member] | Regulatory Liabilities Currently Paying a Return [Member] | Regulatory Liabilities Approved for Payment [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
$ 4.1
|
6.2
|
|
|
|
Remaining Refund Period |
|
33 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
|
0.5
|
|
|
|
Remaining Refund Period |
|
33 years
|
|
|
|
|
Deferred Investment Tax Credits [Member] | Regulatory Liabilities Currently Not Paying Return [Member] | Regulatory Liabilities Approved for Payment [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
$ 216.7
|
215.3
|
|
|
|
Remaining Refund Period |
|
34 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 |
|
$ 8.5
|
9.6
|
|
|
|
Remaining Refund Period |
|
20 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 |
|
$ 21.3
|
25.8
|
|
|
|
Remaining Refund Period |
|
19 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 |
|
$ 51.0
|
51.5
|
|
|
|
Remaining Refund Period |
|
24 years
|
|
|
|
|
Deferred Investment Tax Credits [Member] | Regulatory Liabilities Currently Not Paying Return [Member] | Regulatory Liabilities Approved for Payment [Member] | Southwestern Electric Power Co [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
$ 1.8
|
3.1
|
|
|
|
Remaining Refund Period |
|
10 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 |
|
$ 25.2
|
14.4
|
|
|
|
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 |
|
5.3
|
10.1
|
|
|
|
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 |
|
17.4
|
0.3
|
|
|
|
Other Regulatory Liabilities Approved for Payment [Member] | Regulatory Liabilities Currently Paying a Return [Member] | Regulatory Liabilities Approved for Payment [Member] | Ohio Power Co [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
0.0
|
1.3
|
|
|
|
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
|
2.8
|
|
|
|
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 |
|
71.0
|
87.7
|
|
|
|
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 |
|
1.2
|
4.8
|
|
|
|
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 |
|
12.3
|
18.0
|
|
|
|
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 |
|
30.1
|
24.9
|
|
|
|
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 |
|
0.7
|
2.9
|
|
|
|
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 |
|
1.3
|
4.7
|
|
|
|
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 |
|
1.2
|
1.7
|
|
|
|
Excess Nuclear Decommissioning Funding [Member] | Regulatory Liabilities Currently Not Paying Return [Member] | Regulatory Liabilities Approved for Payment [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
[41] |
1,476.6
|
1,236.0
|
|
|
|
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 |
[42] |
1,476.6
|
1,236.0
|
|
|
|
PJM Transmission Enhancement Refund [Member] | Regulatory Liabilities Currently Not Paying Return [Member] | Regulatory Liabilities Approved for Payment [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
$ 56.2
|
67.3
|
|
|
|
Remaining Refund Period |
|
5 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 |
|
$ 16.3
|
19.5
|
|
|
|
Remaining Refund Period |
|
5 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 |
|
$ 9.9
|
11.8
|
|
|
|
Remaining Refund Period |
|
5 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 |
|
$ 24.5
|
29.4
|
|
|
|
Remaining Refund Period |
|
5 years
|
|
|
|
|
Transition and Restoration Charges - Texas [Member] | Regulatory Liabilities Currently Not Paying Return [Member] | Regulatory Liabilities Approved for Payment [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
$ 48.2
|
50.5
|
|
|
|
Remaining Refund Period |
|
9 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 |
|
$ 48.2
|
50.5
|
|
|
|
Remaining Refund Period |
|
9 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 |
|
$ 44.2
|
0.0
|
|
|
|
Remaining Refund Period |
|
28 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 |
|
$ 44.2
|
0.0
|
|
|
|
Remaining Refund Period |
|
28 years
|
|
|
|
|
Spent Nuclear Fuel [Member] | Regulatory Liabilities Currently Not Paying Return [Member] | Regulatory Liabilities Approved for Payment [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
[41] |
$ 43.1
|
43.6
|
|
|
|
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 |
[42] |
43.1
|
43.6
|
|
|
|
Peak Demand Reduction/Energy Efficiency [Member] | Regulatory Liabilities Currently Not Paying Return [Member] | Regulatory Liabilities Approved for Payment [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
$ 26.3
|
23.0
|
|
|
|
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 |
|
$ 19.9
|
19.7
|
|
|
|
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 |
|
$ 5.2
|
6.0
|
|
|
|
Remaining Refund Period |
|
2 years
|
|
|
|
|
Deferred Gain on Sale of Rockport Unit 2 [Member] | Regulatory Liabilities Currently Not Paying Return [Member] | Regulatory Liabilities Approved for Payment [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
$ 17.9
|
27.2
|
|
|
|
Remaining Refund Period |
|
2 years
|
|
|
|
|
Deferred Gain on Sale of Rockport Unit 2 [Member] | Regulatory Liabilities Currently Not Paying Return [Member] | Regulatory Liabilities Approved for Payment [Member] | Indiana Michigan Power Co [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
$ 7.2
|
10.9
|
|
|
|
Remaining Refund Period |
|
2 years
|
|
|
|
|
Ohio Enhanced Service Reliability Plan [Member] | Regulatory Liabilities Currently Not Paying Return [Member] | Regulatory Liabilities Approved for Payment [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
$ 5.7
|
29.7
|
|
|
|
Remaining Refund Period |
|
2 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 |
|
$ 5.7
|
29.7
|
|
|
|
Remaining Refund Period |
|
2 years
|
|
|
|
|
Virginia Transmission Rate Adjustment Clause [Member] | Regulatory Liabilities Currently Not Paying Return [Member] | Regulatory Liabilities Approved for Payment [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
$ 0.0
|
28.1
|
|
|
|
Virginia Transmission Rate Adjustment Clause [Member] | Regulatory Liabilities Currently Not Paying Return [Member] | Regulatory Liabilities Approved for Payment [Member] | Appalachian Power Co [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
|
0.0
|
28.1
|
|
|
|
Income Taxes Subject to Flow Through [Member] | Income Tax Related Regulatory Liabilities [Member] | Regulatory Liabilities Approved for Payment [Member] |
|
|
|
|
|
|
Regulatory Liabilities |
|
|
|
|
|
|
Noncurrent Regulatory Liabilities |
[7] |
$ (1,407.9)
|
(1,341.8)
|
|
|
|
Remaining Refund Period |
|
54 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 |
[8] |
$ (52.7)
|
(46.2)
|
|
|
|
Remaining Refund Period |
|
28 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 |
[9] |
$ (117.7)
|
(100.4)
|
|
|
|
Remaining Refund Period |
|
38 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 |
[10] |
$ (356.4)
|
(362.3)
|
|
|
|
Remaining Refund Period |
|
24 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 |
[11] |
$ (332.0)
|
(301.0)
|
|
|
|
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 |
[12] |
$ (62.7)
|
(69.7)
|
|
|
|
Remaining Refund Period |
|
29 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] |
$ (8.3)
|
(7.9)
|
|
|
|
Remaining Refund Period |
|
27 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 |
[6] |
$ (275.5)
|
(261.6)
|
|
|
|
Remaining Refund Period |
|
28 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 |
|
$ 19.2
|
13.7
|
|
|
|
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 |
|
$ 7.4
|
10.9
|
|
|
|
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 |
|
$ 8.2
|
$ 8.4
|
|
|
|
Remaining Recovery Period |
|
36 years
|
|
|
|
|
Dolet Hills Generating Station and Related Fuel Operations | Southwestern Electric Power Co [Member] |
|
|
|
|
|
|
Effects of Regulation Textuals [Abstract] |
|
|
|
|
|
|
Percent of Fuel Supply Provided by DHLC |
|
100.00%
|
|
|
|
|
Revisions in Cash Flow Estimates |
|
$ 21.0
|
|
|
|
|
Share of Net Investment in Dolet Hills Power Station |
|
151.0
|
|
|
|
|
Dolet Hills Lignite Company Unbilled Fixed Costs |
|
131.0
|
|
|
|
|
Requested Fuel Cost Deferral |
|
36.0
|
|
|
|
|
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 |
|
212.0
|
|
|
|
|
Pirkey Power Plant and Sabine Unbilled Fixed Costs |
|
193.0
|
|
|
|
|
2019 Texas Base Rate Case [Member] | AEP Texas Inc. [Member] |
|
|
|
|
|
|
Effects of Regulation Textuals [Abstract] |
|
|
|
|
|
|
Asset Impairments and Other Related Charges |
|
$ 33.0
|
|
|
|
|
|
|