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Income Taxes (Tables)
 9 Months Ended
Sep. 30, 2023
Schedule of Effective Income Tax Rate Reconciliation
Three Months Ended September 30, 2023
AEPAEP TexasAEPTCoAPCoI&MOPCoPSOSWEPCo
U.S. Federal Statutory Rate21.0 %21.0 %21.0 %21.0 %21.0 %21.0 %21.0 %21.0 %
Increase (decrease) due to:
State Income Tax, net of Federal Benefit
1.4 %0.5 %2.8 %2.2 %2.1 %0.8 %3.0 %(4.3)%
Tax Reform Excess ADIT Reversal
(5.7)%(1.3)%(0.2)%(5.3)%(8.5)%(6.8)%(17.0)%(6.2)%
Production and Investment Tax Credits
(5.1)%0.1 %— %(0.1)%(0.7)%— %(46.9)%(25.5)%
Flow Through
0.1 %0.2 %0.3 %1.8 %0.7 %0.8 %0.3 %(0.2)%
AFUDC Equity
(1.4)%(1.4)%(2.4)%(1.5)%(0.5)%(0.8)%(1.6)%(0.8)%
Discrete Tax Adjustments
(4.1)%— %— %— %— %— %— %— %
Other
0.1 %(0.5)%(1.0)%0.7 %(3.5)%1.3 %(0.2)%0.2 %
Effective Income Tax Rate6.3 %18.6 %20.5 %18.8 %10.6 %16.3 %(41.4)%(15.8)%

Three Months Ended September 30, 2022
AEPAEP TexasAEPTCoAPCoI&MOPCoPSOSWEPCo
U.S. Federal Statutory Rate21.0 %21.0 %21.0 %21.0 %21.0 %21.0 %21.0 %21.0 %
Increase (decrease) due to:
State Income Tax, net of Federal Benefit
(0.8)%0.5 %2.6 %(6.2)%2.7 %0.7 %3.0 %(5.3)%
Tax Reform Excess ADIT Reversal
(9.7)%(2.0)%0.3 %(8.6)%(13.3)%(6.2)%(21.9)%(4.6)%
Production and Investment Tax Credits
(12.0)%(0.4)%— %— %— %— %(43.7)%(24.1)%
Flow Through
(0.3)%0.2 %0.3 %(0.7)%(1.5)%0.4 %0.4 %(1.3)%
AFUDC Equity
(1.4)%(1.2)%(1.9)%(0.4)%(0.6)%(0.8)%(0.4)%(0.2)%
Discrete Tax Adjustments(0.2)%— %— %— %— %— %— %— %
Other
1.0 %0.2 %0.2 %— %(0.5)%0.2 %0.2 %(0.2)%
Effective Income Tax Rate(2.4)%18.3 %22.5 %5.1 %7.8 %15.3 %(41.4)%(14.7)%
Nine Months Ended September 30, 2023
AEPAEP TexasAEPTCoAPCoI&MOPCoPSOSWEPCo
U.S. Federal Statutory Rate21.0 %21.0 %21.0 %21.0 %21.0 %21.0 %21.0 %21.0 %
Increase (decrease) due to:
State Income Tax, net of Federal Benefit
1.7 %0.5 %2.7 %2.4 %2.3 %0.9 %2.8 %(2.9)%
Tax Reform Excess ADIT Reversal
(6.0)%(1.3)%0.1 %(4.8)%(7.6)%(7.3)%(17.1)%(5.3)%
Production and Investment Tax Credits
(7.4)%— %— %(0.1)%(0.6)%— %(48.9)%(26.7)%
Flow Through
(0.2)%0.2 %0.3 %0.1 %(1.7)%0.8 %0.3 %(0.3)%
AFUDC Equity
(1.4)%(1.2)%(2.0)%(1.2)%(0.4)%(0.8)%(1.5)%(0.5)%
Discrete Tax Adjustments
(2.8)%— %— %1.5 %0.7 %— %— %— %
Other
0.3 %(0.2)%(0.5)%0.4 %(1.2)%0.5 %(0.2)%0.2 %
Effective Income Tax Rate5.2 %19.0 %21.6 %19.3 %12.5 %15.1 %(43.6)%(14.5)%

Nine Months Ended September 30, 2022
AEPAEP TexasAEPTCoAPCoI&MOPCoPSOSWEPCo
U.S. Federal Statutory Rate21.0 %21.0 %21.0 %21.0 %21.0 %21.0 %21.0 %21.0 %
Increase (decrease) due to:
State Income Tax, net of Federal Benefit
0.7 %0.5 %2.7 %(0.8)%1.3 %0.8 %3.2 %(1.5)%
Tax Reform Excess ADIT Reversal
(7.8)%(2.0)%0.3 %(10.3)%(15.7)%(7.3)%(20.8)%(4.8)%
Production and Investment Tax Credits
(8.7)%(0.4)%— %— %(1.4)%— %(39.5)%(22.5)%
Flow Through
— %0.2 %0.3 %0.2 %(1.6)%0.5 %0.3 %(0.8)%
AFUDC Equity
(1.1)%(1.2)%(1.9)%(0.8)%(0.8)%(0.7)%(0.4)%(0.4)%
Discrete Tax Adjustments(0.2)%— %— %(1.8)%— %— %— %0.3 %
Other
0.6 %0.1 %0.1 %— %0.2 %0.1 %0.2 %— %
Effective Income Tax Rate4.5 %18.2 %22.5 %7.5 %3.0 %14.4 %(36.0)%(8.7)%