Related Party Transactions (Tables)

12 Months Ended

Dec. 31, 2016

Appalachian Power Co [Member]

Affiliated Revenues

Related Party Revenues	APCo		I&M		OPCo			PSO			SWEPCo
	(in millions)
Year Ended December 31, 2016
Direct Sales to East Affiliates	$	126.0	$	—	$	—		$	—		$	—
Direct Sales to West Affiliates	—		—		—			—			3.7
Auction Sales to OPCo (a)	9.2		12.0		—			—			—
Direct Sales to AEPEP	—		—		—			—			(0.2		)
Transmission Agreement and Transmission Coordination Agreement Sales	1.3		12.2		(2.0		)	(1.7		)	19.4
Other Revenues	5.6		2.0		19.3			4.3			1.6
Total Affiliated Revenues	$	142.1	$	26.2	$	17.3		$	2.6		$	24.5

Related Party Revenues	APCo		I&M		OPCo		PSO		SWEPCo
	(in millions)
Year Ended December 31, 2015
Direct Sales to East Affiliates	$	132.1	$	—	$	—	$	—	$	—
Auction Sales to OPCo (a)	10.6		17.1		—		—		—
Direct Sales to AEPEP	—		—		29.7		—		(0.2		)
Transmission Agreement and Transmission Coordination Agreement Sales	0.7		8.4		35.5		0.2		15.2
Other Revenues	4.4		1.9		18.9		4.4		1.6
Total Affiliated Revenues	$	147.8	$	27.4	$	84.1	$	4.6	$	16.6

Related Party Revenues	APCo			I&M		OPCo		PSO		SWEPCo
	(in millions)
Year Ended December 31, 2014
Sales under Interconnection Agreement (b)	$	0.2		$	0.5	$	1.1	$	—	$	—
Direct Sales to East Affiliates	141.7			—		—		3.8		10.1
Direct Sales to West Affiliates	0.6			0.4		—		—		0.3
Direct Sales to AEPEP	—			—		44.1		—		—
Transmission Agreement and Transmission Coordination Agreement Sales	(1.6		)	1.7		104.1		—		14.1
Other Revenues	3.6			1.6		15.9		3.3		1.8
Total Affiliated Revenues	$	144.5		$	4.2	$	165.2	$	7.1	$	26.3

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

(b)    Includes December 2013 true-up activity subsequent to agreement termination.

Affiliated Purchases

Related Party Purchases	APCo		I&M		OPCo		PSO		SWEPCo
	(in millions)
Year Ended December 31, 2016
Direct Purchases from West Affiliates	—		—		—		3.7		—
Auction Purchases from AEPEP (a)	—		—		110.1		—		—
Auction Purchases from AEP Energy (a)	—		—		7.7		—		—
Auction Purchases from AEPSC (a)	—		—		24.1		—		—
Direct Purchases from AEGCo	—		228.6		—		—		—
Total Affiliated Purchases	$	—	$	228.6	$	141.9	$	3.7	$	—

Related Party Purchases	APCo		I&M		OPCo		PSO		SWEPCo
	(in millions)
Year Ended December 31, 2015
Direct Purchases from AGR(c)	$	—	$	—	$	269.2	$	—	$	—
Auction Purchases from AEPEP (a)	—		—		225.2		—		—
Auction Purchases from AEPSC (a)	—		—		32.7		—		—
Direct Purchases from AEGCo	—		232.1		—		—		—
Total Affiliated Purchases	$	—	$	232.1	$	527.1	$	—	$	—

Related Party Purchases	APCo		I&M		OPCo		PSO		SWEPCo
	(in millions)
Year Ended December 31, 2014
Purchases under Interconnection Agreement (b)	$	4.7	$	1.6	$	0.1	$	—	$	—
Direct Purchases from East Affiliates	—		—		—		1.0		—
Direct Purchases from West Affiliates	—		—		—		10.0		3.8
Direct Purchases from AGR(c)	—		—		1,305.2		—		—
Direct Purchases from AEPEP	—		—		44.4		—		—
Direct Purchases from AEGCo	—		268.4		—		—		—
Total Affiliated Purchases	$	4.7	$	270.0	$	1,349.7	$	11.0	$	3.8

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

(b)    Includes December 2013 true-up activity subsequent to agreement termination.

Transmission Agreement

	Years Ended December 31,
Company	2016		2015		2014
	(in millions)
APCo	$	103.2	$	92.7	$	84.7
I&M	53.0		38.0		39.7
OPCo	143.6		81.0		17.0

Barging, Urea Transloading and Other Services

	Years Ended December 31,
Company	2016		2015		2014
	(in millions)
AEGCo	$	14.8	$	16.1	$	22.7
AGR	0.3		4.9		5.2
APCo	36.9		37.7		36.1
KPCo	5.3		4.6		5.0
WPCo	4.8		—		—
AEP River Operations LLC – (Nonutility Subsidiary of AEP)	—		15.5		25.3

Central Machine Shop

	Years Ended December 31,
Company	2016		2015		2014
	(in millions)
AEGCo	$	—	$	0.1	$	0.1
AGR	2.0		2.7		2.8
I&M	2.9		2.5		1.7
KPCo	1.5		1.3		1.2
PSO	0.5		0.2		0.3
SWEPCo	0.9		0.8		0.1

Affiliate Railcar Agreement

	December 31, 2016
	Billing Company
Billed Company	I&M		PSO		SWEPCo
APCo	$	—	$	0.3	$	0.3
I&M	—		0.3		0.8
PSO	0.3		—		0.2
SWEPCo	0.9		0.3		—

	December 31, 2015
	Billing Company
Billed Company	I&M		PSO		SWEPCo
APCo	$	—	$	0.3	$	0.3
I&M	—		0.4		1.2
PSO	0.6		—		0.6
SWEPCo	1.8		0.6		—

Ownership and Investment in OVEC

	December 31, 2016
Company	Ownership		Investment
			(in millions)
Parent	39.17	%	$	4.0
OPCo	4.30	%	0.4
Total	43.47	%	$	4.4

Purchased Power from OVEC

	Years Ended December 31,
Company	2016		2015		2014
	(in millions)
APCo	$	88.0	$	87.2	$	96.9
I&M	44.0		43.7		48.5
OPCo	111.7		110.8		123.1

Related Party Sales of Property

Sales

	Years Ended December 31,
Company	2016		2015		2014
	(in millions)
APCo	$	4.5	$	9.4	$	3.0
I&M	5.2		3.0		1.3
OPCo	1.9		2.4		0.5
PSO	7.5		7.1		0.5
SWEPCo	1.0		0.8		1.2

Related Party Purchases of Property

Purchases

	Years Ended December 31,
Company	2016		2015		2014
	(in millions)
APCo	$	1.5	$	8.6	$	0.9
I&M	2.7		8.1		1.4
OPCo	1.7		2.1		1.9
PSO	3.2		0.6		2.1
SWEPCo	6.5		7.4		4.0

Indiana Michigan Power Co [Member]

Affiliated Revenues

Related Party Revenues	APCo		I&M		OPCo			PSO			SWEPCo
	(in millions)
Year Ended December 31, 2016
Direct Sales to East Affiliates	$	126.0	$	—	$	—		$	—		$	—
Direct Sales to West Affiliates	—		—		—			—			3.7
Auction Sales to OPCo (a)	9.2		12.0		—			—			—
Direct Sales to AEPEP	—		—		—			—			(0.2		)
Transmission Agreement and Transmission Coordination Agreement Sales	1.3		12.2		(2.0		)	(1.7		)	19.4
Other Revenues	5.6		2.0		19.3			4.3			1.6
Total Affiliated Revenues	$	142.1	$	26.2	$	17.3		$	2.6		$	24.5

Related Party Revenues	APCo		I&M		OPCo		PSO		SWEPCo
	(in millions)
Year Ended December 31, 2015
Direct Sales to East Affiliates	$	132.1	$	—	$	—	$	—	$	—
Auction Sales to OPCo (a)	10.6		17.1		—		—		—
Direct Sales to AEPEP	—		—		29.7		—		(0.2		)
Transmission Agreement and Transmission Coordination Agreement Sales	0.7		8.4		35.5		0.2		15.2
Other Revenues	4.4		1.9		18.9		4.4		1.6
Total Affiliated Revenues	$	147.8	$	27.4	$	84.1	$	4.6	$	16.6

Related Party Revenues	APCo			I&M		OPCo		PSO		SWEPCo
	(in millions)
Year Ended December 31, 2014
Sales under Interconnection Agreement (b)	$	0.2		$	0.5	$	1.1	$	—	$	—
Direct Sales to East Affiliates	141.7			—		—		3.8		10.1
Direct Sales to West Affiliates	0.6			0.4		—		—		0.3
Direct Sales to AEPEP	—			—		44.1		—		—
Transmission Agreement and Transmission Coordination Agreement Sales	(1.6		)	1.7		104.1		—		14.1
Other Revenues	3.6			1.6		15.9		3.3		1.8
Total Affiliated Revenues	$	144.5		$	4.2	$	165.2	$	7.1	$	26.3

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

(b)    Includes December 2013 true-up activity subsequent to agreement termination.

Affiliated Purchases

Related Party Purchases	APCo		I&M		OPCo		PSO		SWEPCo
	(in millions)
Year Ended December 31, 2016
Direct Purchases from West Affiliates	—		—		—		3.7		—
Auction Purchases from AEPEP (a)	—		—		110.1		—		—
Auction Purchases from AEP Energy (a)	—		—		7.7		—		—
Auction Purchases from AEPSC (a)	—		—		24.1		—		—
Direct Purchases from AEGCo	—		228.6		—		—		—
Total Affiliated Purchases	$	—	$	228.6	$	141.9	$	3.7	$	—

Related Party Purchases	APCo		I&M		OPCo		PSO		SWEPCo
	(in millions)
Year Ended December 31, 2015
Direct Purchases from AGR(c)	$	—	$	—	$	269.2	$	—	$	—
Auction Purchases from AEPEP (a)	—		—		225.2		—		—
Auction Purchases from AEPSC (a)	—		—		32.7		—		—
Direct Purchases from AEGCo	—		232.1		—		—		—
Total Affiliated Purchases	$	—	$	232.1	$	527.1	$	—	$	—

Related Party Purchases	APCo		I&M		OPCo		PSO		SWEPCo
	(in millions)
Year Ended December 31, 2014
Purchases under Interconnection Agreement (b)	$	4.7	$	1.6	$	0.1	$	—	$	—
Direct Purchases from East Affiliates	—		—		—		1.0		—
Direct Purchases from West Affiliates	—		—		—		10.0		3.8
Direct Purchases from AGR(c)	—		—		1,305.2		—		—
Direct Purchases from AEPEP	—		—		44.4		—		—
Direct Purchases from AEGCo	—		268.4		—		—		—
Total Affiliated Purchases	$	4.7	$	270.0	$	1,349.7	$	11.0	$	3.8

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

(b)    Includes December 2013 true-up activity subsequent to agreement termination.

Transmission Agreement

	Years Ended December 31,
Company	2016		2015		2014
	(in millions)
APCo	$	103.2	$	92.7	$	84.7
I&M	53.0		38.0		39.7
OPCo	143.6		81.0		17.0

Coal Transloading

	Years Ended December 31,
Company	2016		2015		2014
	(in millions)
I&M	$	12.8	$	15.8	$	16.2

Railcar Maintenance

	Years Ended December 31,
Company	2016		2015		2014
	(in millions)
I&M	$	1.7	$	2.0	$	2.5
PSO	0.6		0.2		0.3
SWEPCo	3.3		2.8		3.3

Barging, Urea Transloading and Other Services

	Years Ended December 31,
Company	2016		2015		2014
	(in millions)
AEGCo	$	14.8	$	16.1	$	22.7
AGR	0.3		4.9		5.2
APCo	36.9		37.7		36.1
KPCo	5.3		4.6		5.0
WPCo	4.8		—		—
AEP River Operations LLC – (Nonutility Subsidiary of AEP)	—		15.5		25.3

Central Machine Shop

	Years Ended December 31,
Company	2016		2015		2014
	(in millions)
AEGCo	$	—	$	0.1	$	0.1
AGR	2.0		2.7		2.8
I&M	2.9		2.5		1.7
KPCo	1.5		1.3		1.2
PSO	0.5		0.2		0.3
SWEPCo	0.9		0.8		0.1

Affiliate Railcar Agreement

	December 31, 2016
	Billing Company
Billed Company	I&M		PSO		SWEPCo
APCo	$	—	$	0.3	$	0.3
I&M	—		0.3		0.8
PSO	0.3		—		0.2
SWEPCo	0.9		0.3		—

	December 31, 2015
	Billing Company
Billed Company	I&M		PSO		SWEPCo
APCo	$	—	$	0.3	$	0.3
I&M	—		0.4		1.2
PSO	0.6		—		0.6
SWEPCo	1.8		0.6		—

Ownership and Investment in OVEC

	December 31, 2016
Company	Ownership		Investment
			(in millions)
Parent	39.17	%	$	4.0
OPCo	4.30	%	0.4
Total	43.47	%	$	4.4

Purchased Power from OVEC

	Years Ended December 31,
Company	2016		2015		2014
	(in millions)
APCo	$	88.0	$	87.2	$	96.9
I&M	44.0		43.7		48.5
OPCo	111.7		110.8		123.1

Related Party Sales of Property

Sales

	Years Ended December 31,
Company	2016		2015		2014
	(in millions)
APCo	$	4.5	$	9.4	$	3.0
I&M	5.2		3.0		1.3
OPCo	1.9		2.4		0.5
PSO	7.5		7.1		0.5
SWEPCo	1.0		0.8		1.2

Related Party Purchases of Property

Purchases

	Years Ended December 31,
Company	2016		2015		2014
	(in millions)
APCo	$	1.5	$	8.6	$	0.9
I&M	2.7		8.1		1.4
OPCo	1.7		2.1		1.9
PSO	3.2		0.6		2.1
SWEPCo	6.5		7.4		4.0

Ohio Power Co [Member]

Affiliated Revenues

Related Party Revenues	APCo		I&M		OPCo			PSO			SWEPCo
	(in millions)
Year Ended December 31, 2016
Direct Sales to East Affiliates	$	126.0	$	—	$	—		$	—		$	—
Direct Sales to West Affiliates	—		—		—			—			3.7
Auction Sales to OPCo (a)	9.2		12.0		—			—			—
Direct Sales to AEPEP	—		—		—			—			(0.2		)
Transmission Agreement and Transmission Coordination Agreement Sales	1.3		12.2		(2.0		)	(1.7		)	19.4
Other Revenues	5.6		2.0		19.3			4.3			1.6
Total Affiliated Revenues	$	142.1	$	26.2	$	17.3		$	2.6		$	24.5

Related Party Revenues	APCo		I&M		OPCo		PSO		SWEPCo
	(in millions)
Year Ended December 31, 2015
Direct Sales to East Affiliates	$	132.1	$	—	$	—	$	—	$	—
Auction Sales to OPCo (a)	10.6		17.1		—		—		—
Direct Sales to AEPEP	—		—		29.7		—		(0.2		)
Transmission Agreement and Transmission Coordination Agreement Sales	0.7		8.4		35.5		0.2		15.2
Other Revenues	4.4		1.9		18.9		4.4		1.6
Total Affiliated Revenues	$	147.8	$	27.4	$	84.1	$	4.6	$	16.6

Related Party Revenues	APCo			I&M		OPCo		PSO		SWEPCo
	(in millions)
Year Ended December 31, 2014
Sales under Interconnection Agreement (b)	$	0.2		$	0.5	$	1.1	$	—	$	—
Direct Sales to East Affiliates	141.7			—		—		3.8		10.1
Direct Sales to West Affiliates	0.6			0.4		—		—		0.3
Direct Sales to AEPEP	—			—		44.1		—		—
Transmission Agreement and Transmission Coordination Agreement Sales	(1.6		)	1.7		104.1		—		14.1
Other Revenues	3.6			1.6		15.9		3.3		1.8
Total Affiliated Revenues	$	144.5		$	4.2	$	165.2	$	7.1	$	26.3

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

(b)    Includes December 2013 true-up activity subsequent to agreement termination.

Affiliated Purchases

Related Party Purchases	APCo		I&M		OPCo		PSO		SWEPCo
	(in millions)
Year Ended December 31, 2016
Direct Purchases from West Affiliates	—		—		—		3.7		—
Auction Purchases from AEPEP (a)	—		—		110.1		—		—
Auction Purchases from AEP Energy (a)	—		—		7.7		—		—
Auction Purchases from AEPSC (a)	—		—		24.1		—		—
Direct Purchases from AEGCo	—		228.6		—		—		—
Total Affiliated Purchases	$	—	$	228.6	$	141.9	$	3.7	$	—

Related Party Purchases	APCo		I&M		OPCo		PSO		SWEPCo
	(in millions)
Year Ended December 31, 2015
Direct Purchases from AGR(c)	$	—	$	—	$	269.2	$	—	$	—
Auction Purchases from AEPEP (a)	—		—		225.2		—		—
Auction Purchases from AEPSC (a)	—		—		32.7		—		—
Direct Purchases from AEGCo	—		232.1		—		—		—
Total Affiliated Purchases	$	—	$	232.1	$	527.1	$	—	$	—

Related Party Purchases	APCo		I&M		OPCo		PSO		SWEPCo
	(in millions)
Year Ended December 31, 2014
Purchases under Interconnection Agreement (b)	$	4.7	$	1.6	$	0.1	$	—	$	—
Direct Purchases from East Affiliates	—		—		—		1.0		—
Direct Purchases from West Affiliates	—		—		—		10.0		3.8
Direct Purchases from AGR(c)	—		—		1,305.2		—		—
Direct Purchases from AEPEP	—		—		44.4		—		—
Direct Purchases from AEGCo	—		268.4		—		—		—
Total Affiliated Purchases	$	4.7	$	270.0	$	1,349.7	$	11.0	$	3.8

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

(b)    Includes December 2013 true-up activity subsequent to agreement termination.

Transmission Agreement

	Years Ended December 31,
Company	2016		2015		2014
	(in millions)
APCo	$	103.2	$	92.7	$	84.7
I&M	53.0		38.0		39.7
OPCo	143.6		81.0		17.0

Ownership and Investment in OVEC

	December 31, 2016
Company	Ownership		Investment
			(in millions)
Parent	39.17	%	$	4.0
OPCo	4.30	%	0.4
Total	43.47	%	$	4.4

Purchased Power from OVEC

	Years Ended December 31,
Company	2016		2015		2014
	(in millions)
APCo	$	88.0	$	87.2	$	96.9
I&M	44.0		43.7		48.5
OPCo	111.7		110.8		123.1

Related Party Sales of Property

Sales

	Years Ended December 31,
Company	2016		2015		2014
	(in millions)
APCo	$	4.5	$	9.4	$	3.0
I&M	5.2		3.0		1.3
OPCo	1.9		2.4		0.5
PSO	7.5		7.1		0.5
SWEPCo	1.0		0.8		1.2

Related Party Purchases of Property

Purchases

	Years Ended December 31,
Company	2016		2015		2014
	(in millions)
APCo	$	1.5	$	8.6	$	0.9
I&M	2.7		8.1		1.4
OPCo	1.7		2.1		1.9
PSO	3.2		0.6		2.1
SWEPCo	6.5		7.4		4.0

Public Service Co Of Oklahoma [Member]

Affiliated Revenues

Related Party Revenues	APCo		I&M		OPCo			PSO			SWEPCo
	(in millions)
Year Ended December 31, 2016
Direct Sales to East Affiliates	$	126.0	$	—	$	—		$	—		$	—
Direct Sales to West Affiliates	—		—		—			—			3.7
Auction Sales to OPCo (a)	9.2		12.0		—			—			—
Direct Sales to AEPEP	—		—		—			—			(0.2		)
Transmission Agreement and Transmission Coordination Agreement Sales	1.3		12.2		(2.0		)	(1.7		)	19.4
Other Revenues	5.6		2.0		19.3			4.3			1.6
Total Affiliated Revenues	$	142.1	$	26.2	$	17.3		$	2.6		$	24.5

Related Party Revenues	APCo		I&M		OPCo		PSO		SWEPCo
	(in millions)
Year Ended December 31, 2015
Direct Sales to East Affiliates	$	132.1	$	—	$	—	$	—	$	—
Auction Sales to OPCo (a)	10.6		17.1		—		—		—
Direct Sales to AEPEP	—		—		29.7		—		(0.2		)
Transmission Agreement and Transmission Coordination Agreement Sales	0.7		8.4		35.5		0.2		15.2
Other Revenues	4.4		1.9		18.9		4.4		1.6
Total Affiliated Revenues	$	147.8	$	27.4	$	84.1	$	4.6	$	16.6

Related Party Revenues	APCo			I&M		OPCo		PSO		SWEPCo
	(in millions)
Year Ended December 31, 2014
Sales under Interconnection Agreement (b)	$	0.2		$	0.5	$	1.1	$	—	$	—
Direct Sales to East Affiliates	141.7			—		—		3.8		10.1
Direct Sales to West Affiliates	0.6			0.4		—		—		0.3
Direct Sales to AEPEP	—			—		44.1		—		—
Transmission Agreement and Transmission Coordination Agreement Sales	(1.6		)	1.7		104.1		—		14.1
Other Revenues	3.6			1.6		15.9		3.3		1.8
Total Affiliated Revenues	$	144.5		$	4.2	$	165.2	$	7.1	$	26.3

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

(b)    Includes December 2013 true-up activity subsequent to agreement termination.

Affiliated Purchases

Related Party Purchases	APCo		I&M		OPCo		PSO		SWEPCo
	(in millions)
Year Ended December 31, 2016
Direct Purchases from West Affiliates	—		—		—		3.7		—
Auction Purchases from AEPEP (a)	—		—		110.1		—		—
Auction Purchases from AEP Energy (a)	—		—		7.7		—		—
Auction Purchases from AEPSC (a)	—		—		24.1		—		—
Direct Purchases from AEGCo	—		228.6		—		—		—
Total Affiliated Purchases	$	—	$	228.6	$	141.9	$	3.7	$	—

Related Party Purchases	APCo		I&M		OPCo		PSO		SWEPCo
	(in millions)
Year Ended December 31, 2015
Direct Purchases from AGR(c)	$	—	$	—	$	269.2	$	—	$	—
Auction Purchases from AEPEP (a)	—		—		225.2		—		—
Auction Purchases from AEPSC (a)	—		—		32.7		—		—
Direct Purchases from AEGCo	—		232.1		—		—		—
Total Affiliated Purchases	$	—	$	232.1	$	527.1	$	—	$	—

Related Party Purchases	APCo		I&M		OPCo		PSO		SWEPCo
	(in millions)
Year Ended December 31, 2014
Purchases under Interconnection Agreement (b)	$	4.7	$	1.6	$	0.1	$	—	$	—
Direct Purchases from East Affiliates	—		—		—		1.0		—
Direct Purchases from West Affiliates	—		—		—		10.0		3.8
Direct Purchases from AGR(c)	—		—		1,305.2		—		—
Direct Purchases from AEPEP	—		—		44.4		—		—
Direct Purchases from AEGCo	—		268.4		—		—		—
Total Affiliated Purchases	$	4.7	$	270.0	$	1,349.7	$	11.0	$	3.8

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

(b)    Includes December 2013 true-up activity subsequent to agreement termination.

Transmission Coordination Agreement

	Years Ended December 31,
Company	2016			2015			2014
	(in millions)
PSO	$	19.6		$	15.0		$	14.1
SWEPCo	(19.6		)	(15.0		)	(14.1		)

Railcar Maintenance

	Years Ended December 31,
Company	2016		2015		2014
	(in millions)
I&M	$	1.7	$	2.0	$	2.5
PSO	0.6		0.2		0.3
SWEPCo	3.3		2.8		3.3

Central Machine Shop

	Years Ended December 31,
Company	2016		2015		2014
	(in millions)
AEGCo	$	—	$	0.1	$	0.1
AGR	2.0		2.7		2.8
I&M	2.9		2.5		1.7
KPCo	1.5		1.3		1.2
PSO	0.5		0.2		0.3
SWEPCo	0.9		0.8		0.1

Affiliate Railcar Agreement

	December 31, 2016
	Billing Company
Billed Company	I&M		PSO		SWEPCo
APCo	$	—	$	0.3	$	0.3
I&M	—		0.3		0.8
PSO	0.3		—		0.2
SWEPCo	0.9		0.3		—

	December 31, 2015
	Billing Company
Billed Company	I&M		PSO		SWEPCo
APCo	$	—	$	0.3	$	0.3
I&M	—		0.4		1.2
PSO	0.6		—		0.6
SWEPCo	1.8		0.6		—

Related Party Sales of Property

Sales

	Years Ended December 31,
Company	2016		2015		2014
	(in millions)
APCo	$	4.5	$	9.4	$	3.0
I&M	5.2		3.0		1.3
OPCo	1.9		2.4		0.5
PSO	7.5		7.1		0.5
SWEPCo	1.0		0.8		1.2

Related Party Purchases of Property

Purchases

	Years Ended December 31,
Company	2016		2015		2014
	(in millions)
APCo	$	1.5	$	8.6	$	0.9
I&M	2.7		8.1		1.4
OPCo	1.7		2.1		1.9
PSO	3.2		0.6		2.1
SWEPCo	6.5		7.4		4.0

Southwestern Electric Power Co [Member]

Affiliated Revenues

Related Party Revenues	APCo		I&M		OPCo			PSO			SWEPCo
	(in millions)
Year Ended December 31, 2016
Direct Sales to East Affiliates	$	126.0	$	—	$	—		$	—		$	—
Direct Sales to West Affiliates	—		—		—			—			3.7
Auction Sales to OPCo (a)	9.2		12.0		—			—			—
Direct Sales to AEPEP	—		—		—			—			(0.2		)
Transmission Agreement and Transmission Coordination Agreement Sales	1.3		12.2		(2.0		)	(1.7		)	19.4
Other Revenues	5.6		2.0		19.3			4.3			1.6
Total Affiliated Revenues	$	142.1	$	26.2	$	17.3		$	2.6		$	24.5

Related Party Revenues	APCo		I&M		OPCo		PSO		SWEPCo
	(in millions)
Year Ended December 31, 2015
Direct Sales to East Affiliates	$	132.1	$	—	$	—	$	—	$	—
Auction Sales to OPCo (a)	10.6		17.1		—		—		—
Direct Sales to AEPEP	—		—		29.7		—		(0.2		)
Transmission Agreement and Transmission Coordination Agreement Sales	0.7		8.4		35.5		0.2		15.2
Other Revenues	4.4		1.9		18.9		4.4		1.6
Total Affiliated Revenues	$	147.8	$	27.4	$	84.1	$	4.6	$	16.6

Related Party Revenues	APCo			I&M		OPCo		PSO		SWEPCo
	(in millions)
Year Ended December 31, 2014
Sales under Interconnection Agreement (b)	$	0.2		$	0.5	$	1.1	$	—	$	—
Direct Sales to East Affiliates	141.7			—		—		3.8		10.1
Direct Sales to West Affiliates	0.6			0.4		—		—		0.3
Direct Sales to AEPEP	—			—		44.1		—		—
Transmission Agreement and Transmission Coordination Agreement Sales	(1.6		)	1.7		104.1		—		14.1
Other Revenues	3.6			1.6		15.9		3.3		1.8
Total Affiliated Revenues	$	144.5		$	4.2	$	165.2	$	7.1	$	26.3

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

(b)    Includes December 2013 true-up activity subsequent to agreement termination.

Affiliated Purchases

Related Party Purchases	APCo		I&M		OPCo		PSO		SWEPCo
	(in millions)
Year Ended December 31, 2016
Direct Purchases from West Affiliates	—		—		—		3.7		—
Auction Purchases from AEPEP (a)	—		—		110.1		—		—
Auction Purchases from AEP Energy (a)	—		—		7.7		—		—
Auction Purchases from AEPSC (a)	—		—		24.1		—		—
Direct Purchases from AEGCo	—		228.6		—		—		—
Total Affiliated Purchases	$	—	$	228.6	$	141.9	$	3.7	$	—

Related Party Purchases	APCo		I&M		OPCo		PSO		SWEPCo
	(in millions)
Year Ended December 31, 2015
Direct Purchases from AGR(c)	$	—	$	—	$	269.2	$	—	$	—
Auction Purchases from AEPEP (a)	—		—		225.2		—		—
Auction Purchases from AEPSC (a)	—		—		32.7		—		—
Direct Purchases from AEGCo	—		232.1		—		—		—
Total Affiliated Purchases	$	—	$	232.1	$	527.1	$	—	$	—

Related Party Purchases	APCo		I&M		OPCo		PSO		SWEPCo
	(in millions)
Year Ended December 31, 2014
Purchases under Interconnection Agreement (b)	$	4.7	$	1.6	$	0.1	$	—	$	—
Direct Purchases from East Affiliates	—		—		—		1.0		—
Direct Purchases from West Affiliates	—		—		—		10.0		3.8
Direct Purchases from AGR(c)	—		—		1,305.2		—		—
Direct Purchases from AEPEP	—		—		44.4		—		—
Direct Purchases from AEGCo	—		268.4		—		—		—
Total Affiliated Purchases	$	4.7	$	270.0	$	1,349.7	$	11.0	$	3.8

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

(b)    Includes December 2013 true-up activity subsequent to agreement termination.

Transmission Coordination Agreement

	Years Ended December 31,
Company	2016			2015			2014
	(in millions)
PSO	$	19.6		$	15.0		$	14.1
SWEPCo	(19.6		)	(15.0		)	(14.1		)

Railcar Maintenance

	Years Ended December 31,
Company	2016		2015		2014
	(in millions)
I&M	$	1.7	$	2.0	$	2.5
PSO	0.6		0.2		0.3
SWEPCo	3.3		2.8		3.3

Central Machine Shop

	Years Ended December 31,
Company	2016		2015		2014
	(in millions)
AEGCo	$	—	$	0.1	$	0.1
AGR	2.0		2.7		2.8
I&M	2.9		2.5		1.7
KPCo	1.5		1.3		1.2
PSO	0.5		0.2		0.3
SWEPCo	0.9		0.8		0.1

Affiliate Railcar Agreement

	December 31, 2016
	Billing Company
Billed Company	I&M		PSO		SWEPCo
APCo	$	—	$	0.3	$	0.3
I&M	—		0.3		0.8
PSO	0.3		—		0.2
SWEPCo	0.9		0.3		—

	December 31, 2015
	Billing Company
Billed Company	I&M		PSO		SWEPCo
APCo	$	—	$	0.3	$	0.3
I&M	—		0.4		1.2
PSO	0.6		—		0.6
SWEPCo	1.8		0.6		—

Related Party Sales of Property

Sales

	Years Ended December 31,
Company	2016		2015		2014
	(in millions)
APCo	$	4.5	$	9.4	$	3.0
I&M	5.2		3.0		1.3
OPCo	1.9		2.4		0.5
PSO	7.5		7.1		0.5
SWEPCo	1.0		0.8		1.2

Related Party Purchases of Property

Purchases

	Years Ended December 31,
Company	2016		2015		2014
	(in millions)
APCo	$	1.5	$	8.6	$	0.9
I&M	2.7		8.1		1.4
OPCo	1.7		2.1		1.9
PSO	3.2		0.6		2.1
SWEPCo	6.5		7.4		4.0