Related Party Transactions (Tables)

12 Months Ended

Dec. 31, 2020

Affiliated Revenues

Related Party Revenues	AEP Texas		AEPTCo		APCo		I&M		OPCo		PSO		SWEPCo
	(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 AEPEP	87.5		—		—		—		—		—		—
Transmission Revenues	—		885.0		49.1		2.9		16.6		—		37.4
Other Revenues	3.3		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 Revenues	AEP Texas		AEPTCo		APCo		I&M		OPCo		PSO		SWEPCo
	(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 AEPEP	157.2		—		—		—		—		—		(0.1)
Transmission Revenues	—		795.5		58.5		0.7		7.7		1.3		3.6
Other Revenues	3.3		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

Related Party Revenues	AEP Texas		AEPTCo		APCo		I&M		OPCo		PSO		SWEPCo
	(in millions)
Year Ended December 31, 2018
Direct Sales to East Affiliates	$	—	$	—	$	133.2	$	0.1	$	—	$	—	$	—
Auction Sales to OPCo (a)	—		—		5.8		7.1		—		—		—
Direct Sales to AEPEP	103.6		—		—		—		—		—		—
Transmission Revenues	—		591.4		36.4		11.7		3.9		0.9		26.9
Other Revenues	1.6		7.5		6.0		3.2		17.1		4.5		1.5
Total Affiliated Revenues	$	105.2	$	598.9	$	181.4	$	22.1	$	21.0	$	5.4	$	28.4

(a)Refer to the Ohio Auctions section below for further information regarding these amounts.

Affiliated Purchases

Related Party Purchases	I&M		OPCo
	(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 AEGCo	172.8		—
Total Affiliated Purchases	$	172.8	$	119.7

Related Party Purchases	I&M		OPCo
	(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 AEGCo	214.9		—
Total Affiliated Purchases	$	214.9	$	156.0

Related Party Purchases	I&M		OPCo
	(in millions)
Year Ended December 31, 2018
Auction Purchases from AEPEP (a)	$	—	$	79.7
Auction Purchases from AEP Energy (a)	—		41.0
Auction Purchases from AEPSC (a)	—		14.6
Direct Purchases from AEGCo	237.9		—
Total Affiliated Purchases	$	237.9	$	135.3

(a)    Refer to the Ohio Auctions section below for further information regarding this amount.

PJM Transmission Service Charges

	Years Ended December 31,
Company	2020		2019		2018
	(in millions)
APCo	$	243.2	$	222.3	$	128.3
I&M	145.9		143.5		91.4
OPCo	417.4		373.4		210.1

SPP Transmission Service Charges

	Years Ended December 31,
Company	2020		2019		2018
	(in millions)
PSO	$	69.7	$	46.9	$	65.9
SWEPCo	31.3		20.1		10.5

Joint License Agreement

	Years Ended December 31,
Billing Company	2020		2019		2018
	(in millions)
APCo	$	0.9	$	0.2	$	—
I&M	3.0		1.5		2.2
KPCo	0.4		0.3		0.2
OPCo	4.5		2.2		2.9
PSO	0.4		0.3		0.3
WPCo	0.2		0.1		—

Railcar Maintenance

	Years Ended December 31,
Company	2020		2019		2018
	(in millions)
I&M	$	0.9	$	1.3	$	1.5
PSO	0.7		0.8		0.7
SWEPCo	3.0		4.0		3.4

Barging, Urea Transloading and Other Services

	Years Ended December 31,
Company	2020		2019		2018
	(in millions)
AEGCo	$	10.6	$	14.9	$	19.9
APCo	43.7		38.9		35.1
KPCo	3.2		4.8		4.2
WPCo	3.3		4.8		4.2

Central Machine Shop

	Years Ended December 31,
Company	2020		2019		2018
	(in millions)
AGR	$	2.9	$	0.8	$	1.6
I&M	3.2		2.3		2.4
KPCo	0.9		1.4		1.7
PSO	0.9		1.1		0.5
SWEPCo	0.5		1.1		0.7

Related Party Sales of Property

Sales

	Years Ended December 31,
Company	2020		2019		2018
	(in millions)
AEP Texas	$	0.9	$	0.9	$	0.3
AEPTCo	0.2		—		—
APCo	5.7		5.5		5.4
I&M	1.5		7.5		8.2
OPCo	7.0		7.0		10.7
PSO	1.1		0.8		1.0
SWEPCo	0.8		0.2		0.8

Related Party Purchases of Property

Purchases

	Years Ended December 31,
Company	2020		2019		2018
	(in millions)
AEP Texas	$	1.5	$	0.3	$	0.1
AEPTCo	6.0		10.2		18.5
APCo	1.3		6.0		0.6
I&M	3.4		0.9		2.0
OPCo	1.2		3.0		2.8
PSO	0.4		0.5		1.3
SWEPCo	2.8		0.7		0.8

Charitable Contribution to AEP Foundation [Table Text Block]

	Year Ended
Company	December 31, 2019
	(in millions)
AEP	$	50.0
AEP Texas	6.2
AEPTCo	6.5
APCo	8.9
I&M	9.0
OPCo	5.4
PSO	3.4
SWEPCo	5.5