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The Company owns transmission facilities but provides no electric service at retail in Oklahoma.false9.11Jeffrey W. Hoersdig, Assistant Controller212 East Sixth StreetTulsa, Oklahoma 741191.227false17.391.32820.8017.401.4291.520.8117.411.620.821.717.422C00053720.83false17.432.172.220.84817.442.39120.852.417.4510220.8617.46320.87O17.47420.8817.48520.8917.49620.90217.505820.91717.519920.921117.52101420.9317.53111520.941617.541720.951917.552020.9617.562120.97317.5720.9817.5820.9917.591221.0017.60321.0117.614221.02417.62521.036617.63721.041117.6466.1821.051317.656.1196.1221.061517.66106.1321.0717116.1417.676.151221.081917.686.2136.321.092117.69146.4421.10236.517.70156.621.11251617.716.7176.821.122717.726.91821.1329717.73197.121.143117.74207.115.017.221.15335.022117.757.35.032221.167.45.0417.76237.55.0521.1717.777.65.06247.721.185.0717.78257.85.0821.19267.917.791519.0217.1219.1622.2920.661619.0317.1319.1722.3020.671719.0417.1419.1822.3120.6817.0119.0517.1519.1922.3220.6917.0219.0617.1619.2022.3320.7017.0319.0717.1719.2122.3420.7117.0419.0817.1819.2222.3520.7217.0519.0917.1919.2322.3620.7317.0619.1017.2019.2422.3720.7417.0719.1117.2119.2522.3820.7517.0819.1217.2219.2622.3920.7617.0919.1317.2319.2722.4020.7717.1019.1417.2419.2822.4120.7817.1119.1517.2519.2922.4220.7917.1219.1617.2619.30622.4320.80717.1319.1717.2719.31822.4420.8117.1419.1817.2819.32922.451020.8217.1519.1917.2919.3322.4620.8317.1619.2017.3019.3422.4720.8417.1719.2117.3119.3522.48120.8517.1819.2217.3219.36222.49320.8617.1919.2317.3319.37422.5020.8717.2019.2417.3419.385622.5120.8817.2119.2517.3519.39722.52820.8917.2219.2617.3619.40922.5320.9017.2319.2717.3719.41101122.5420.9117.2419.2817.3819.4222.5520.9217.2519.2917.3919.4322.5620.9317.2619.3017.4019.4422.5720.9417.2719.3117.4119.4522.5820.9517.2819.3217.4219.4622.5920.9617.2919.3317.4319.4722.6020.9717.3019.3417.4419.4822.6120.9817.3119.3517.4519.4922.6220.9917.3219.3617.4619.5022.6321.0017.3319.3717.4719.5122.6421.0117.3419.3817.4819.5222.6521.0217.3519.3917.4919.5322.6821.0317.3619.4017.5019.5422.6921.0417.3719.4117.5119.5521.0517.3819.4217.5219.569.1221.8820.2520.399.1318.62221.899.1420.2620.4018.6339.1521.90420.2720.419.1618.6459.1721.9120.2820.4269.1818.65721.929.1920.2920.4318.6689.2021.9311120.3020.449.21218.67139.2221.94520.3120.459.2318.68721.9520.3220.46918.691121.9620.3320.4718.7021.9737277264220.3420.4818.7121.9820.3520.4918.72Wdesk from Workiva21.9920.3620.5018.7322.0020.3720.5118.7422.01120.3820.5218.75222.0220.3920.5318.763222.03520.4020.5418.7749122.0420.4120.5513218.78522.0516320.4220.5618.79620422.062220.4320.57518.80724622.0720.4420.5826718.81822.0828820.4520.593718.8293022.093620.4620.601018.83101322.1020.4720.6118.841122.1120.4820.6218.851222.1220.4920.6318.861322.1320.5020.6418.871422.1420.5120.6518.8823.181522.1520.5220.6618.8916722.16920.5320.6718.90171022.1720.5420.681218.9117.0122.181420.5520.6918.9217.0222.1920.5620.7018.9317.0322.2020.5720.7118.9417.04222.21320.5820.7218.9517.05422.2220.5920.73518.9617.0622.23620.6020.7418.9717.0722.2420.6120.7518.9817.0822.2520.6220.761218.9917.091322.2620.6320.771419.0017.1022.271520.6420.7819.0117.111622.2820.65 C000537 SWEPCo-D Spare/Major Equip CIferc:ElectricUtilityMember 2022-01-012022-12-31 C000537 TL180 Flint Creek, East Centerton,  1 , 7.99, 1272.0  ACSR 2022-01-012022-12-31 C000537 General Service GS TX 2022-01-012022-12-31 C000537 LUCAS - LA, Distribution, , 69, 13.09, , 80,  2022-12-31 C000537 TL422 Quitman , Quitman (WCEC),  1 , 0.18, 1, 556 ACSR, , 2022-01-012022-12-31 C000537 SWEPCO Next Gen Radio Sys 1ferc:ElectricUtilityMember 2022-12-31 C000537 Transmission Base Plan Funding FERC Formula Rates Under Recovery 2022-12-31 C000537 CARROLL (SEP) - LA, Distribution, , 34.5, 13.2, , 3.5,  2022-12-31 C000537 Pole Attachments 2022-12-31 C000537 North Central Wind.over/under recovery of the WFA Rider 2022-01-012022-12-31 C000537 ferc:NitrogenOxideMemberferc:NextTwelveMonthsMember 2022-01-012022-12-31 C000537 State Tax, State Tax, NE , 2020 2021-12-31 C000537 TL344 Flint Creek, Shipe Road,  1 , 14.4, 2x954.0 ACSR 2022-01-012022-12-31 C000537 BIG SANDY (SW) - TX, Distribution, , 69, 13.09, , 9.375,  2022-01-012022-12-31 C000537 TL153 Nashville, Okay,  2 , 13.76, 559.0  ACAR 2022-01-012022-12-31 C000537 North Benton D CI 2022-01-012022-12-31 C000537 Sales & Use Tax, Sales And Use Tax, LA , 2021 2022-12-31 C000537 TL235 Northwest Texarkana, Northeast Texarkana (Sugarhill),  1 , 0.5, 1272.0  ACSR 2022-01-012022-12-31 C000537 Lighting PL/AL/OL 2022-01-012022-12-31 C000537 TL409 HILL LAKE EXTENSION, ,  1 , 0.25, 1272.0  ACSR 2022-01-012022-12-31 C000537 MIDLAND (SW) - AR, Distribution, , 69, 12.47, , 7.5,  2022-12-31 C000537 SOUTH FAYETTEVILLE - AR, Transmission, , 12, 0, 0, 0, STATCAP 2022-01-012022-12-31 C000537 GEORGIA PACIFIC (SW) - LA, Distribution, , 138, 12.47, , 7,  2022-12-31 C000537 ARSENAL HILL - LA, Transmission, , 138, 0, 0, 0, Air Core Reactor 2022-01-012022-12-31 C000537 TL349 Many, Belmont,  1 , 3.8, 795 kCM ACSR 2022-01-012022-12-31 C000537 NORTH MINEOLA - TX, Transmission, , 69, 0, 0, 0, STATCAP 2022-12-31 C000537 ferc:SulfurDioxideMember Purchases/Transfers: 2022-01-012022-12-31 C000537 Ed-Ci-Sepcotx-D Ast Imp 2022-01-012022-12-31 C000537 TL158 Texarkana Plant - Was, 12th St - Patterson/tap - Co-Oper Tire (TLN194:0158E),  1 , 2.8, 2x336.0  ACSR 2022-01-012022-12-31 C000537 ATLANTA - TX, Distribution, , 69, 12.47, , 66,  2022-12-31 C000537 Property Tax, Property Tax, OK , 2020 2022-01-012022-12-31 C000537 Dierks to Mena 111 CIferc:ElectricUtilityMember 2022-01-012022-12-31 C000537 TL114 Shreveport 69KV Loop, (TLN194:00114),  1 , 1.77, 2x397.0  ACSR 2022-01-012022-12-31 C000537 254 - Ohio Reliability 2022-01-012022-12-31 C000537 MARSHALL 138KV - TX, Transmission, , 138, 69, 13, 133,  2022-12-31 C000537 Large Lighting and Power Service LLP ARK 2022-01-012022-12-31 C000537 REEVES ROAD - AR, Distribution, , 161, 13.09, , 7.5,  2022-01-012022-12-31 C000537 RICHMOND ROAD - TX, Distribution, , 69, 12.47, , 33, 1 2022-01-012022-12-31 C000537 Notes Receivable from Associated Companies 2022-01-012022-12-31 C000537 Ed-Ci-Sepco-D Cust Serv 2022-01-012022-12-31 C000537 345 kV in OK, 345 kV in OK, , 0, 2022-01-012022-12-31 C000537 Corporate Planning & Budgeting, AEPSC 2022-01-012022-12-31 C000537 ferc:IncomeTaxMember 2022-12-31 C000537 RED OAK (SEP) - LA, Distribution, , 34.5, 13.2, , 7,  2022-12-31 C000537 Franchise Tax, Franchise Tax, LA , 2022 2022-12-31 C000537 TL202 Beckville - Cathage, Center (TLN194:0202A),  1 , 0.8, 397.0  ACSR 2022-01-012022-12-31 C000537 TL128 Arsenal Hill, Lieberman,  1 , 2, 666.6 ACSR 2022-01-012022-12-31 C000537 Amortization of Regulatory Debits and Credits (Net) 2021-01-012021-12-31 C000537 ferc:PenaltyTaxMember 2022-01-012022-12-31 C000537 TL228 Bann, North New Boston,  1 , 2.2, 2x477.0  ACSR 2022-01-012022-12-31 C000537 ROCK HILL - TX, Transmission, , 138, 70.5, 13.09, 180,  2022-12-31 C000537 Other Debit or Cr. Items (Describe, details in footnote):ferc:ElectricPlantInServiceMemberferc:ElectricUtilityMember 2022-01-012022-12-31 C000537 66-057 Gilmer, Perdue,  1 , 11.44, 397.0  ACSR 2022-01-012022-12-31 C000537 WALDRON - AR, Distribution, , 69, 12.47, , 7.5,  2022-12-31 C000537 Operations & Performance Transformation, AEPSC 2022-01-012022-12-31 C000537 NORTHWEST TEXARKANA - TX, Transmission, , 12, , , , REACTOR 2022-01-012022-12-31 C000537 ferc:OtherTaxMember 2021-12-31 C000537 Other Taxes & Fees, Other Taxes and Fees, AR , 2022 2022-12-31 C000537 Senior Unsecured Notes Series J, 3.90% 2022-01-012022-12-31 C000537 Dolet Hills Lignite Company (1), 37043 2022-01-012022-12-31 C000537 20160523-5233, 42513, ER07-1069-000 2022-01-012022-12-31 C000537 Turk Power Plant Joint Ownership Deferred Credits 2022-01-012022-12-31 C000537 TONTITOWN - AR, Transmission, , 161, 0, 0, 0, Air Core Reactor 2022-12-31 C000537 State Tax, State Tax, LA , 2021 2022-01-012022-12-31 C000537 Franchise Tax, Franchise Tax, LA , 2005 2021-12-31 C000537 Property Tax, Property Tax, WV , 2021 2022-12-31 C000537 FERNDALE LAKE - TX, Distribution, , 69, 12.47, , 2.3,  2022-12-31 C000537 401 - Operation Expense - Nonassociatedferc:DirectPayrollDistributionMember 2022-01-012022-12-31 C000537 0ferc:DecemberMember 2022-01-012022-12-31 C000537 CIS-Common Deployment-SWP D 2022-01-012022-12-31 C000537 314.3-ArsenalHillStall 2022-01-012022-12-31 C000537 Residential Service RS ARK 2022-01-012022-12-31 C000537 Large Lighting & Power Service LLP w/Bkup,Maint,AAS TX 2022-01-012022-12-31 C000537 Local Tax, Local Tax, TX , 2021 2022-01-012022-12-31 C000537 TOTAL TRANSMISSION 2022-01-012022-12-31 C000537 Utility Operations, AEPSC 2022-01-012022-12-31 C000537 Unamortized Credit Line Fees Amortization period through 6/1/2022 2022-12-31 C000537 390 2022-01-012022-12-31 C000537 315.3 - Wilkes 2022-01-012022-12-31 C000537 Deferred Arkansas Environmental Chemical Costs per Docket No. 14-080-U 2 2022-12-31 C000537 TL209 Daingerfield, Mount Pleasant, 2, 1.3, 1272 ACSR 2022-01-012022-12-31 C000537 Eureka Springs 3 Terminalferc:ElectricUtilityMember 2022-01-012022-12-31 C000537 Disallowance of the Texas portion of the Dolet Hills Plant. (PUCT Docket 51415) 2022-01-012022-12-31 C000537 TL215 Turnertown-Overton-Poynter, Beckville-Marshall (215),  2 , 16.62, 4/0  ACSR 2022-01-012022-12-31 C000537 TL375 Marshall, Rockhill,  1 , 2.25, 1272.0 ACSR 2022-01-012022-12-31 C000537 BANN - TX, Transmission, , 138, 72.6, 12, 133,  2022-12-31 C000537 TL154 VBI, Rogers/Loop Thru Springdale (TLN194:0154G),  1 , 4.4, 1590.0  ACSR 2022-01-012022-12-31 C000537 SWEPCo-D-Tx Spare/Mjr Equip CIferc:ElectricUtilityMember 2022-01-012022-12-31 C000537 NOL-STATE C/F-DEF TAX ASSET-L/ferc:ElectricUtilityMember 2021-12-31 C000537 312.3 - Lieberman 2022-01-012022-12-31 C000537 TL246 North New Boston, Wilkes,  1 , 0.06, 1272.0 ACSR 2022-01-012022-12-31 C000537 Shreveport Service Center(New)ferc:ElectricUtilityMember 2022-01-012022-12-31 C000537 TL333 Caplis, Port Robson,  1 , 1.29, 1590.0  ACSR 2022-01-012022-12-31 C000537 NOL-STATE C/F-DEF TAX ASSET-L/ferc:ElectricUtilityMember 2022-12-31 C000537 LONDON (SW) - TX, Distribution, , 138, 12.47, , 28,  2022-12-31 C000537 ferc:OtherAllocatedTaxMember 2021-12-31 C000537 Regulatory Services A&G, AEPSC 2022-01-012022-12-31 C000537 State Tax, State Tax, OK , 2020ferc:ElectricUtilityMember 2022-01-012022-12-31 C000537 ferc:AfterThreeYearsMemberferc:SulfurDioxideMember 2022-01-012022-12-31 C000537 Senior Unsecured - Series O, 3.25% 2022-12-31 C000537 State Tax, State Tax, LA , 2021 2021-12-31 C000537 TL292 Finney Tap, Port Robson,  1 , 3.25, 1590.0  ACSR 2022-01-012022-12-31 C000537 CHILDRESS WEST (SEP) - TX, Transmission, , 0, 0, 0, 0, STATCAP 2022-12-31 C000537 2021-12-31 C000537 FORT HUMBUG - LA, Transmission, , 138, 70.5, 13.09, 130,  2022-01-012022-12-31 C000537 GREENWOOD - AR, Distribution, , 34.5, 7.56, , 8.4,  2022-01-012022-12-31 C000537 TL271 Welsh, Lydia, 1, 0.16, 2x795  ACSR 2022-01-012022-12-31 C000537 GILMER - TX, Distribution, , 69, 12.5, , 40,  2022-01-012022-12-31 C000537 State Tax, State Tax, AR , 2018 2022-01-012022-12-31 C000537 WALLACE LAKE - LA, Transmission, , 138, 69, 13, 83,  2022-12-31 C000537 FAYETTEVILLE (SW) - AR, Distribution, , 12, 0, 0, 0, STATCAP 2022-12-31 C000537 HARTS ISLAND - LA, Distribution, , 138, 34.5, , 100,  2022-01-012022-12-31 C000537 Franchise Tax, Franchise Tax, TX , 2005 2022-12-31 C000537 TL301 West Childress, Estelline,  1 , 17.27, T2 477 ACSR 2022-01-012022-12-31 C000537 NASHVILLE 69KV - AR, Distribution, , 69, 36, , 2.5,  2022-01-012022-12-31 C000537 20181101-5217, 43405, ER18-195-000 2022-01-012022-12-31 C000537 Maverick Wind Facility 2022-12-31 C000537 ferc:ElectricUtilityMember Corp Prgrm Billing-SWEPCO Tran 2022-01-012022-12-31 C000537 Other State Tax, Other State Tax, OH , 2022 2021-12-31 C000537 EAST CENTERTON - AR, Transmission, , 161, 69, 12.47, 156,  2022-01-012022-12-31 C000537 Franchise Tax, Franchise Tax, DE , 2019 2022-12-31 C000537 FLOURNOY - LA, Transmission, , 69, 12.5, , 40,  2022-12-31 C000537 T/SW/Telecom Modernization Proferc:ElectricUtilityMember 2022-01-012022-12-31 C000537 TL249 Whitney-Pliler, Diana-Lone Star South (TLN194:00249),  1 , 0.12, 2x336.0&397.0 ACS 2022-01-012022-12-31 C000537 BONANZA - AR, Transmission, , 161, 34.5, , 12,  2022-01-012022-12-31 C000537 TL245 Knox Lee, South Shreveport (TLN194:00245),  2 , 10.01, 795.0  ACSR 2022-01-012022-12-31 C000537 David M. Feinberg, Secretary and Vice President 2022-01-012022-12-31 C000537 TL152 Mena-DeQueen-Nashvill, Narrows Dame/Tap-Murfreesboro (TLN194:00152),  1 , 5.63, 795.0  ACSR 2022-01-012022-12-31 C000537 SOUTHEAST FAYETTEVILLE - AR, Distribution, , 161, 12.47, , 24,  2022-01-012022-12-31 C000537 BLANCHARD - LA, Distribution, , 69, 13.09, , 25,  2022-12-31 C000537 Traverse Wind Project SWEPCoferc:ElectricUtilityMember 2022-01-012022-12-31 C000537 TRK SCR CATALYST LEVEL 2 REPLferc:ElectricUtilityMember 2022-01-012022-12-31 C000537 TL243 Eastex Switching, Whitney (TLN194:243A1),  2 , 0.83, 2x795.0  ACSR 2022-01-012022-12-31 C000537 AMI SWEPCO Louisianaferc:ElectricUtilityMember 2022-01-012022-12-31 C000537 WASKOM - TX, Distribution, , 69, 13.09, , 26,  2022-12-31 C000537 NEW HOPE (SW) - TX, Distribution, , 69, 12.47, , 18.75,  2022-12-31 C000537 NORTH BENTON - LA, Transmission, , 138, 69, 13.2, 42,  2022-01-012022-12-31 C000537 NEW BOSTON - TX, Distribution, , 12, 0, 0, 0, STATCAP 2022-12-31 C000537 Refund Provision related to Turk Power Plant Prudence Review Settlement - Dec 2017 per LPSC Docket No. U-33856 (Long Term Portion) 2021-12-31 C000537 SABINE - TX, Distribution, , 12, 0, 0, 0, STATCAP 2022-12-31 C000537 WINNSBORO - TX, Distribution, , 138, 70.5, 12.47, 130,  2022-01-012022-12-31 C000537 SCOTTSVILLE (SW) - TX, Distribution, , 138, 12.47, , 40,  2022-12-31 C000537 NORTH MINEOLA - TX, Transmission, , 69, 12.47, , 9.375,  2022-01-012022-12-31 C000537 T/SW/Telecom Modernization Pro 2022-01-012022-12-31 C000537 Franchise Tax, Franchise Tax, DE , 2021 2022-01-012022-12-31 C000537 ferc:ElectricPollutionControlFacilitiesMember 2021-12-31 C000537 TL213 Texarkana Plant, Bann-De Kalb-Mt Pleasant (TLN194:0213M),  1 , 2.7, 1272.0  ACSR 2022-01-012022-12-31 C000537 BEAN - LA, Distribution, , 12, 0, 0, 0, STATCAP 2022-12-31 C000537 Mutual Energy SWEPCO, LLC, 42237 2022-12-31 C000537 AMI SWEPCO Texas 2022-01-012022-12-31 C000537 GRAND SALINE - TX, Distribution, , 12, 0, 0, 0, STATCAP 2022-12-31 C000537 State Tax, State Tax, AR , 2017 2021-12-31 C000537