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Related Party Transactions (Tables)
 12 Months Ended
Dec. 31, 2021
Affiliated Revenues
Related Party RevenuesAEP TexasAEPTCoAPCoI&MOPCoPSOSWEPCo
(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 $41.0 
Related Party RevenuesAEP TexasAEPTCoAPCoI&MOPCoPSOSWEPCo
(in millions)
Year Ended December 31, 2020
Direct Sales to East Affiliates$— $— $112.5 $— $— $— $— 
Auction Sales to OPCo (a)— — 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 $39.0 
Related Party RevenuesAEP TexasAEPTCoAPCoI&MOPCoPSOSWEPCo
(in millions)
Year Ended December 31, 2019
Direct Sales to East Affiliates$— $— $128.6 $— $— $— $— 
Auction Sales to OPCo (a)— — 11.4 6.7 — — — 
Direct Sales to AEPEP157.2 — — — — — (0.1)
Transmission Revenues
— 795.5 58.5 0.7 7.7 1.3 3.6 
Other Revenues3.3 11.2 6.8 3.1 19.6 4.8 1.4 
Total Affiliated Revenues$160.5 $806.7 $205.3 $10.5 $27.3 $6.1 $4.9 

(a)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, 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 

Related Party PurchasesI&MOPCo
(in millions)
Year Ended December 31, 2019
Auction Purchases from AEPEP (a)$— $64.6 
Auction Purchases from AEP Energy (a)— 69.9 
Auction Purchases from AEPSC (a)— 21.5 
Direct Purchases from AEGCo214.9 — 
Total Affiliated Purchases$214.9 $156.0 

(a)    Refer to the Ohio Auctions section below for further information regarding this amount.
PJM Transmission Service Charges
Years Ended December 31,
Company202120202019
(in millions)
APCo$302.0 $243.2 $222.3 
I&M186.7 145.9 143.5 
OPCo508.9 417.4 373.4 
SPP Transmission Service Charges
Years Ended December 31,
Company202120202019
(in millions)
PSO$94.7 $69.7 $46.9 
SWEPCo56.2 31.3 20.1 
Joint License Agreement
Years Ended December 31,
Billing Company202120202019
(in millions)
APCo$2.4 $0.9 $0.2 
I&M4.8 3.0 1.5 
KPCo0.5 0.4 0.3 
OPCo4.6 4.5 2.2 
PSO0.4 0.4 0.3 
WPCo0.2 0.2 0.1 
Railcar Maintenance
Years Ended December 31,
Company202120202019
(in millions)
I&M$0.3 $0.9 $1.3 
PSO0.4 0.7 0.8 
SWEPCo2.8 3.0 4.0 
Barging, Urea Transloading and Other Services
Years Ended December 31,
Company202120202019
(in millions)
AEGCo$7.6 $10.6 $14.9 
APCo40.1 43.7 38.9 
KPCo3.1 3.2 4.8 
WPCo
3.2 3.3 4.8 
Central Machine Shop
Years Ended December 31,
Company202120202019
(in millions)
AGR$0.4 $2.9 $0.8 
I&M2.4 3.2 2.3 
KPCo1.0 0.9 1.4 
OPCo0.4 — — 
PSO0.7 0.9 1.1 
SWEPCo2.7 0.5 1.1 
Related Party Sales of Property
Sales
Years Ended December 31,
Company202120202019
(in millions)
AEP Texas$0.4 $0.9 $0.9 
AEPTCo1.4 0.2 — 
APCo6.2 5.7 5.5 
I&M7.0 1.5 7.5 
OPCo9.2 7.0 7.0 
PSO0.5 1.1 0.8 
SWEPCo0.4 0.8 0.2 
Related Party Purchases of Property
Purchases
Years Ended December 31,
Company202120202019
(in millions)
AEP Texas$0.4 $1.5 $0.3 
AEPTCo16.7 6.0 10.2 
APCo1.0 1.3 6.0 
I&M0.6 3.4 0.9 
OPCo1.4 1.2 3.0 
PSO0.3 0.4 0.5 
SWEPCo0.3 2.8 0.7 
Charitable Contribution to AEP Foundation [Table Text Block]
Year Ended
CompanyDecember 31, 2019
(in millions)
AEP$50.0 
AEP Texas6.2 
AEPTCo6.5 
APCo8.9 
I&M9.0 
OPCo5.4 
PSO3.4 
SWEPCo5.5