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BUSINESS SEGMENTS (Tables)
 9 Months Ended
Sep. 30, 2025
Segment Reporting [Abstract]  
Reportable Segment Information
The tables below represent AEP’s reportable segment income statement information for the three and nine months ended September 30, 2025 and 2024 and reportable segment balance sheet information as of September 30, 2025 and December 31, 2024. The significant expenses disclosed below align with the segment-level information that is regularly provided to the CODM.

Three Months Ended September 30, 2025
VIUT&DAEPTHCoG&MTotal Reportable SegmentsCorporate and Other (a)Reconciling AdjustmentsConsolidated
(in millions)
Revenues from:
External Customers$3,511.2 $1,680.2 $119.7 $693.8 $6,004.9 $5.5 $— $6,010.4 
Other Operating Segments74.5 9.1 453.5 18.9 556.0 30.4 (586.4)(b)— 
Total Revenues3,585.7 1,689.3 573.2 712.7 6,560.9 35.9 (586.4)6,010.4 
Purchased Electricity, Fuel and Other Consumables Used for Electric Generation1,168.4 263.8 — 624.9 2,057.1 — (76.9)1,980.2 
Other Operation and Maintenance998.2 623.5 53.3 35.4 1,710.4 8.1 (515.6)1,202.9 
Depreciation and Amortization547.4 209.8 123.5 3.9 884.6 (5.0)— 879.6 
Taxes Other Than Income Taxes141.6 190.4 87.3 0.7 420.0 0.2 6.1 426.3 
Allowance for Equity Funds Used During Construction19.4 18.3 20.8 — 58.5 — — 58.5 
Interest Expense219.1 106.4 63.3 1.5 390.3 140.2 (22.0)508.5 
Income Tax Expense (Benefit)(25.6)57.2 62.0 15.5 109.1 29.6 — 138.7 
Equity Earnings of Unconsolidated Subsidiaries0.2 0.1 20.8 — 21.1 — — 21.1 
Other Segment Items (c)(22.0)(11.0)25.5 (13.5)(21.0)(19.2)22.0 (18.2)
Earnings (Loss) Attributable to AEP Common Shareholders$578.2 $267.6 $199.9 $44.3 $1,090.0 $(118.0)$— $972.0 
Gross Property Additions$1,203.2 $711.2 $368.0 $3.2 $2,285.6 $18.5 $(25.1)$2,279.0 

Three Months Ended September 30, 2024
VIUT&DAEPTHCoG&MTotal Reportable SegmentsCorporate and Other (a)Reconciling AdjustmentsConsolidated
(in millions)
Revenues from:
External Customers$3,248.8 $1,568.5 $113.1 $483.7 $5,414.1 $6.0 $— $5,420.1 
Other Operating Segments54.2 6.9 399.4 15.4 475.9 32.1 (508.0)(b)— 
Total Revenues3,303.0 1,575.4 512.5 499.1 5,890.0 38.1 (508.0)5,420.1 
Purchased Electricity, Fuel and Other Consumables Used for Electric Generation1,100.4 213.2 — 413.6 1,727.2 — (68.0)1,659.2 
Other Operation and Maintenance881.6 599.1 40.0 20.6 1,541.3 53.6 (445.4)1,149.5 
Depreciation and Amortization530.6 212.8 110.5 4.0 857.9 (5.2)— 852.7 
Taxes Other Than Income Taxes138.1 181.6 81.2 0.8 401.7 0.1 5.4 407.2 
Allowance for Equity Funds Used During Construction12.9 17.0 24.3 — 54.2 — — 54.2 
Interest Expense189.9 106.4 56.2 4.0 356.5 168.4 (26.1)498.8 
Income Tax Expense (Benefit)(64.6)49.4 60.9 (23.1)22.6 14.9 — 37.5 
Equity Earnings (Loss) of Unconsolidated Subsidiaries0.4 — 23.0 — 23.4 (6.1)— 17.3 
Other Segment Items (c)(31.2)(15.3)(3.7)(14.1)(64.3)(34.7)26.1 (72.9)
Earnings (Loss) Attributable to AEP Common Shareholders$571.5 $245.2 $214.7 $93.3 $1,124.7 $(165.1)$— $959.6 
Gross Property Additions$809.3 $609.7 $425.8 $13.2 $1,858.0 $7.4 $(15.1)$1,850.3 
Nine Months Ended September 30, 2025
VIUT&DAEPTHCoG&MTotal Reportable SegmentsCorporate and Other (a)Reconciling AdjustmentsConsolidated
(in millions)
Revenues from:
External Customers$9,531.2 $4,638.3 $390.7 $1,975.4 $16,535.6 $25.1 $— $16,560.7 
Other Operating Segments207.5 27.7 1,481.2 50.4 1,766.8 85.0 (1,851.8)(b)— 
Total Revenues9,738.7 4,666.0 1,871.9 2,025.8 18,302.4 110.1 (1,851.8)16,560.7 
Purchased Electricity, Fuel and Other Consumables Used for Electric Generation3,164.3 730.3 — 1,700.8 5,595.4 — (220.9)5,374.5 
Other Operation and Maintenance2,863.4 1,741.7 135.7 65.5 4,806.3 44.4 (1,648.6)3,202.1 
Depreciation and Amortization1,593.9 614.2 360.8 12.3 2,581.2 (15.1)— 2,566.1 
Taxes Other Than Income Taxes398.1 554.9 240.1 1.7 1,194.8 0.8 17.7 1,213.3 
Allowance for Equity Funds Used During Construction51.8 56.4 64.7 — 172.9 — — 172.9 
Interest Expense620.8 318.0 178.9 5.4 1,123.1 438.3 (68.5)1,492.9 
Income Tax Expense (Benefit)(117.2)141.9 (10.4)70.0 84.3 (71.0)— 13.3 
Equity Earnings of Unconsolidated Subsidiaries0.8 1.5 66.5 — 68.8 11.1 — 79.9 
Other Segment Items (c)(67.0)(33.2)85.1 (38.7)(53.8)(61.4)68.5 (46.7)
Earnings (Loss) Attributable to AEP Common Shareholders$1,335.0 $656.1 $1,012.9 $208.8 $3,212.8 $(214.8)$— $2,998.0 
Gross Property Additions$4,356.4 $2,078.9 $1,181.9 $9.9 $7,627.1 $54.3 $(22.9)$7,658.5 

Nine Months Ended September 30, 2024
VIUT&DAEPTHCoG&MTotal Reportable SegmentsCorporate and Other (a)Reconciling AdjustmentsConsolidated
(in millions)
Revenues from:
External Customers$8,722.0 $4,480.5 $332.3 $1,442.1 $14,976.9 $48.1 $— $15,025.0 
Other Operating Segments147.9 21.0 1,167.4 88.0 1,424.3 100.5 (1,524.8)(b)— 
Total Revenues8,869.9 4,501.5 1,499.7 1,530.1 16,401.2 148.6 (1,524.8)15,025.0 
Purchased Electricity, Fuel and Other Consumables Used for Electric Generation2,970.3 729.0 — 1,151.0 4,850.3 — (246.8)4,603.5 
Other Operation and Maintenance2,720.1 1,639.0 122.8 94.5 4,576.4 114.6 (1,292.9)3,398.1 
Asset Impairments and Other Related Charges13.4 52.9 — 76.2 142.5 — — 142.5 
Depreciation and Amortization1,470.4 662.2 327.5 17.3 2,477.4 (15.7)— 2,461.7 
Taxes Other Than Income Taxes410.7 550.4 233.4 1.5 1,196.0 0.3 14.9 1,211.2 
Allowance for Equity Funds Used During Construction37.4 50.9 64.7 — 153.0 — — 153.0 
Interest Expense537.3 298.4 166.4 14.9 1,017.0 479.5 (96.5)1,400.0 
Income Tax Expense (Benefit)(324.5)116.3 172.2 (4.3)(40.3)(57.4)— (97.7)
Equity Earnings (Loss) of Unconsolidated Subsidiaries1.1 (0.8)72.6 0.9 73.8 (6.8)— 67.0 
Other Segment Items (c)(87.3)(38.9)(9.4)(46.2)(181.8)(92.0)96.5 (177.3)
Earnings (Loss) Attributable to AEP Common Shareholders$1,198.0 $542.3 $624.1 $226.1 $2,590.5 $(287.5)$— $2,303.0 
Gross Property Additions$2,290.2 $1,730.8 $1,120.4 $33.2 $5,174.6 $16.9 $(22.9)$5,168.6 
September 30, 2025
VIUT&DAEPTHCoG&MTotal Reportable SegmentsCorporate and Other (a)Reconciling AdjustmentsConsolidated
(in millions)
Total Assets$59,005.8 $28,429.9 $18,918.9 $1,899.7 $108,254.3 $6,172.3 (d)$(4,173.1)(e)$110,253.5 
Investments in Equity Method Investees$8.8 $3.6 $1,057.9 $— $1,070.3 $165.5 $— $1,235.8 

December 31, 2024
VIUT&DAEPTHCoG&MTotal Reportable SegmentsCorporate and Other (a)Reconciling AdjustmentsConsolidated
(in millions)
Total Assets$54,996.5 $26,864.3 $18,011.9 $1,633.9 $101,506.6 $5,550.8 (d)$(3,979.4)(e)$103,078.0 
Investments in Equity Method Investees$9.1 $2.0 $996.1 $— $1,007.2 $48.7 $— $1,055.9 

(a)Corporate and Other primarily includes the purchasing of receivables from certain AEP utility subsidiaries. This segment also includes Parent’s guarantee revenue received from affiliates, investment income, interest income and interest expense, income tax expense and other nonallocated costs.
(b)Represents intersegment revenues.
(c)Other segment items included in segment earnings (loss) attributable to AEP common shareholders primarily includes Interest and Dividend Income, Non-Service Cost Components of Net Period Benefit Cost and Net Income (Loss) Attributable to Noncontrolling Interests.
(d)Includes elimination of AEP Parent’s investments in wholly-owned subsidiary companies.
(e)Reconciling Adjustments for Total Assets primarily include elimination of intercompany advances to affiliates and intercompany accounts receivable.
The tables below present AEPTCo’s reportable segment income statement information for the three and nine months ended September 30, 2025 and 2024 and reportable segment balance sheet information as of September 30, 2025 and December 31, 2024. The significant expenses disclosed below align with the segment-level information that is regularly provided to the CODM.

Three Months Ended September 30, 2025
State TranscosAEPTCo ParentReconciling AdjustmentsAEPTCo
Consolidated
(in millions)
Revenues from:
External Customers
$107.9 $— $— $107.9 
Sales to AEP Affiliates
450.1 — — 450.1 
Total Revenues558.0 — — 558.0 
Other Operation and Maintenance49.8 0.1 — 49.9 
Depreciation and Amortization
121.3 — — 121.3 
Taxes Other Than Income Taxes85.9 — — 85.9 
Interest Income
0.8 65.5 (65.0)(a)1.3 
Allowance for Equity Funds Used During Construction 20.8 — — 20.8 
Interest Expense 61.2 65.1 (65.0)(a)61.3 
Income Tax Expense56.1 0.1 — 56.2 
Other Segment Items (b)— 26.6 — 26.6 
Earnings (Loss) Attributable to AEPTCo Common Shareholders$205.3 $(26.4)(c)$— $178.9 
Gross Property Additions$357.8 $— $— $357.8 

Three Months Ended September 30, 2024
State TranscosAEPTCo ParentReconciling AdjustmentsAEPTCo
Consolidated
(in millions)
Revenues from:
External Customers
$101.1 $— $— $101.1 
Sales to AEP Affiliates
395.9 — — 395.9 
Other Revenues
0.2 — — 0.2 
Total Revenues497.2 — — 497.2 
Other Operation and Maintenance37.3 0.1 — 37.4 
Depreciation and Amortization
108.2 — — 108.2 
Taxes Other Than Income Taxes79.7 — — 79.7 
Interest Income
2.3 61.7 (60.9)(a)3.1 
Allowance for Equity Funds Used During Construction 24.3 — — 24.3 
Interest Expense 54.2 61.0 (60.9)(a)54.3 
Income Tax Expense53.6 0.1 — 53.7 
Earnings Attributable to AEPTCo Common Shareholders$190.8 $0.5 (c)$— $191.3 
Gross Property Additions$385.1 $— $— $385.1 
Nine Months Ended September 30, 2025
State TranscosAEPTCo ParentReconciling AdjustmentsAEPTCo
Consolidated
(in millions)
Revenues from:
External Customers
$356.8 $— $— $356.8 
Sales to AEP Affiliates
1,470.0 — — 1,470.0 
Other Revenues
0.1 — — 0.1 
Total Revenues1,826.9 — — 1,826.9 
Other Operation and Maintenance126.2 0.3 — 126.5 
Depreciation and Amortization
354.3 — — 354.3 
Taxes Other Than Income Taxes235.8 — — 235.8 
Interest Income
1.8 238.8 (237.5)(a)3.1 
Allowance for Equity Funds Used During Construction 64.7 — — 64.7 
Interest Expense 222.7 187.7 (237.5)(a)172.9 
Income Tax Expense (Benefit)(39.1)10.8 — (28.3)
Other Segment Items (b)— 87.3 — 87.3 
Earnings (Loss) Attributable to AEPTCo Common Shareholders$993.5 $(47.3)(c)$— $946.2 
Gross Property Additions$1,144.7 $— $— $1,144.7 

Nine Months Ended September 30, 2024
State TranscosAEPTCo ParentReconciling AdjustmentsAEPTCo
Consolidated
(in millions)
Revenues from:
External Customers
$295.1 $— $— $295.1 
Sales to AEP Affiliates
1,157.1 — — 1,157.1 
Other Revenues
3.0 — — 3.0 
Total Revenues1,455.2 — — 1,455.2 
Other Operation and Maintenance115.9 1.7 — 117.6 
Depreciation and Amortization
320.8 — — 320.8 
Taxes Other Than Income Taxes228.6 — — 228.6 
Interest Income
6.8 180.5 (178.0)(a)9.3 
Allowance for Equity Funds Used During Construction 64.7 — — 64.7 
Interest Expense 160.3 178.2 (178.0)(a)160.5 
Income Tax Expense153.4 0.1 — 153.5 
Earnings Attributable to AEPTCo Common Shareholders$547.7 $0.5 (c)$— $548.2 
Gross Property Additions$1,042.9 $— $— $1,042.9 

September 30, 2025
State TranscosAEPTCo ParentReconciling AdjustmentsAEPTCo
Consolidated
(in millions)
Total Assets $17,222.2 $6,396.4 (d)$(6,410.0)(e)$17,208.6 

December 31, 2024
State TranscosAEPTCo ParentReconciling AdjustmentsAEPTCo
Consolidated
(in millions)
Total Assets $16,887.7 $8,670.4 (d)$(9,187.8)(e)$16,370.3 

(a)Elimination of intercompany interest income/interest expense on affiliated debt arrangement.
(b)Other segment items included in segment earnings (loss) attributable to AEPTCo common shareholders primarily includes Net Income (Loss) Attributable to Noncontrolling Interests.
(c)Includes elimination of AEPTCo Parent’s equity earnings in the State Transcos.
(d)Primarily relates to Notes Receivable from the State Transcos.
(e)Primarily relates to elimination of Notes Receivable from the State Transcos.