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Related Party Transactions (Tables)
 12 Months Ended
Dec. 31, 2022
Affiliated Revenues
Related Party RevenuesAEP TexasAEPTCoAPCoI&M (a)OPCoPSOSWEPCo
(in millions)
Year Ended December 31, 2022
Direct Sales to East Affiliates$— $— $169.7 $— $— $— $— 
Direct Sales to West Affiliates— — — — — — 1.3 
Transmission Revenues
— 1,276.4 77.5 7.7 (3.6)— 51.5 
Other Revenues3.5 7.4 8.9 7.6 22.4 2.9 1.1 
Total Affiliated Revenues$3.5 $1,283.8 $256.1 $15.3 $18.8 $2.9 $53.9 
Related Party RevenuesAEP TexasAEPTCoAPCoI&M (a)OPCoPSOSWEPCo
(in millions)
Year Ended December 31, 2021
Direct Sales to East Affiliates$— $— $128.6 $— $— $— $— 
Transmission Revenues
— 1,136.1 60.3 (2.5)(1.1)— 39.6 
Other Revenues3.9 17.8 9.0 6.3 25.9 4.2 1.4 
Total Affiliated Revenues$3.9 $1,153.9 $197.9 $3.8 $24.8 $4.2 $41.0 
Related Party RevenuesAEP TexasAEPTCoAPCoI&M (a)OPCoPSOSWEPCo
(in millions)
Year Ended December 31, 2020
Direct Sales to East Affiliates$— $— $112.5 $— $— $— $— 
Auction Sales to OPCo (b)— — 5.3 3.1 — — — 
Direct Sales to AEPEP87.5 — — — — — — 
Transmission Revenues
— 885.0 49.1 2.9 16.6 — 37.4 
Other Revenues3.3 11.3 7.8 4.5 24.9 5.2 1.6 
Total Affiliated Revenues$90.8 $896.3 $174.7 $10.5 $41.5 $5.2 $39.0 

(a)I&M’s affiliated revenues exclude capacity sales to KPCo from Rockport Plant, Unit 2 and barging, urea transloading and other transportation services to affiliates. See sections “Unit Power Agreements” and “I&M Barging, Urea Transloading and Other Services” below for additional information.
(b)Refer to the Ohio Auctions section below for further information regarding these amounts.
Affiliated Purchases
Related Party PurchasesI&MOPCo
(in millions)
Year Ended December 31, 2022
Auction Purchases from AEPEP (a)$— $9.8 
Direct Purchases from AEGCo241.8 — 
Total Affiliated Purchases$241.8 $9.8 

Related Party PurchasesI&MOPCo
(in millions)
Year Ended December 31, 2021
Auction Purchases from AEPEP (a)$— $26.6 
Auction Purchases from AEP Energy (a)— 25.3 
Direct Purchases from AEGCo217.9 — 
Total Affiliated Purchases$217.9 $51.9 

Related Party PurchasesI&MOPCo
(in millions)
Year Ended December 31, 2020
Auction Purchases from AEPEP (a)$— $51.0 
Auction Purchases from AEP Energy (a)— 58.7 
Auction Purchases from AEPSC (a)— 10.0 
Direct Purchases from AEGCo172.8 — 
Total Affiliated Purchases$172.8 $119.7 

(a)    Refer to the Ohio Auctions section below for further information regarding this amount.
PJM Transmission Service Charges
Years Ended December 31,
Company202220212020
(in millions)
APCo$345.1 $302.0 $243.2 
I&M220.8 186.7 145.9 
OPCo608.2 508.9 417.4 
SPP Transmission Service Charges
Years Ended December 31,
Company202220212020
(in millions)
PSO$110.8 $94.7 $69.7 
SWEPCo62.1 56.2 31.3 
Joint License Agreement
Years Ended December 31,
Billing Company202220212020
(in millions)
APCo$2.5 $2.4 $0.9 
I&M6.1 4.8 3.0 
KPCo0.6 0.5 0.4 
OPCo5.2 4.6 4.5 
PSO0.1 0.4 0.4 
WPCo0.2 0.2 0.2 
Railcar Maintenance
Years Ended December 31,
Company202220212020
(in millions)
I&M$0.6 $0.3 $0.9 
PSO0.6 0.4 0.7 
SWEPCo2.7 2.8 3.0 
Barging, Urea Transloading and Other Services
Years Ended December 31,
Company202220212020
(in millions)
AEGCo$11.3 $7.6 $10.6 
APCo36.1 40.1 43.7 
KPCo2.0 3.1 3.2 
WPCo
4.7 3.2 3.3 
Related Party Sales of Property
Sales
Years Ended December 31,
Company202220212020
(in millions)
AEP Texas$3.0 $0.4 $0.9 
AEPTCo2.3 1.4 0.2 
APCo16.0 6.2 5.7 
I&M5.3 7.0 1.5 
OPCo7.6 9.2 7.0 
PSO2.5 0.5 1.1 
SWEPCo1.0 0.4 0.8 
Related Party Purchases of Property
Purchases
Years Ended December 31,
Company202220212020
(in millions)
AEP Texas$1.3 $0.4 $1.5 
AEPTCo11.6 16.7 6.0 
APCo2.4 1.0 1.3 
I&M2.0 0.6 3.4 
OPCo2.0 1.4 1.2 
PSO7.6 0.3 0.4 
SWEPCo2.8 0.3 2.8 
Charitable Contribution to AEP Foundation [Table Text Block]
Year Ended
CompanyDecember 31, 2022
(in millions)
AEP$75.0 
AEP Texas9.9 
AEPTCo11.1 
APCo12.5 
I&M11.0 
OPCo8.1 
PSO5.8 
SWEPCo8.8