Derivatives and Hedging (Tables)

6 Months Ended

Jun. 30, 2017

Notional Volume of Derivative Instruments

Notional Volume of Derivative Instruments

June 30, 2017

Primary Risk Exposure	Unit of Measure	AEP		APCo		I&M		OPCo		PSO		SWEPCo
		(in millions)
Commodity:
Power	MWhs	472.7		91.5		54.6		10.7		30.5		36.4
Coal	Tons	1.0		—		0.5		—		—		0.5
Natural Gas	MMBtus	26.6		1.9		1.1		—		—		—
Heating Oil and Gasoline	Gallons	7.4		1.4		0.7		1.7		0.7		0.9
Interest Rate	USD	$	62.0	$	—	$	—	$	—	$	—	$	—
Interest Rate	USD	$	1,000.0	$	—	$	—	$	—	$	—	$	—

Notional Volume of Derivative Instruments

December 31, 2016

Primary Risk Exposure	Unit of Measure	AEP		APCo		I&M		OPCo		PSO		SWEPCo
		(in millions)
Commodity:
Power	MWhs	348.0		51.9		19.9		11.2		11.9		14.2
Coal	Tons	1.5		—		0.5		—		—		1.0
Natural Gas	MMBtus	32.8		—		—		—		—		—
Heating Oil and Gasoline	Gallons	7.4		1.4		0.7		1.6		0.8		0.9
Interest Rate	USD	$	75.2	$	0.1	$	0.1	$	—	$	—	$	—
Interest Rate and Foreign Currency	USD	$	500.0	$	—	$	—	$	—	$	—	$	—

Cash Collateral Netting

	June 30, 2017				December 31, 2016
	Cash Collateral		Cash Collateral		Cash Collateral		Cash Collateral
	Received		Paid		Received		Paid
	Netted Against		Netted Against		Netted Against		Netted Against
	Risk Management		Risk Management		Risk Management		Risk Management
Company	Assets		Liabilities		Assets		Liabilities
	(in millions)
AEP	$	9.2	$	24.0	$	7.9	$	7.6
APCo	2.1		0.1		0.5		0.7
I&M	2.3		—		0.3		0.4
OPCo	—		—		0.2		—
PSO	—		—		0.1		—
SWEPCo	—		—		0.1		—

Fair Value of Derivative Instruments

AEP

Fair Value of Derivative Instruments

June 30, 2017

	Risk Management Contracts		Hedging Contracts						Gross Amounts of Risk Management Assets/ Liabilities Recognized		Gross Amounts Offset in the Statement of Financial Position (b)			Net Amounts of Assets/Liabilities Presented in the Statement of Financial Position (c)
Balance Sheet Location	Commodity (a)		Commodity (a)			Interest Rate and Foreign Currency (a)
	(in millions)
Current Risk Management Assets	$	366.0	$	8.1		$	4.8		$	378.9	$	(208.4	)	$	170.5
Long-term Risk Management Assets	340.6		4.1			—			344.7		(59.1		)	285.6
Total Assets	706.6		12.2			4.8			723.6		(267.5		)	456.1
Current Risk Management Liabilities	260.1		12.1			1.5			273.7		(212.0		)	61.7
Long-term Risk Management Liabilities	325.6		55.3			—			380.9		(70.3		)	310.6
Total Liabilities	585.7		67.4			1.5			654.6		(282.3		)	372.3
Total MTM Derivative Contract Net Assets (Liabilities)	$	120.9	$	(55.2	)	$	3.3		$	69.0	$	14.8		$	83.8
Fair Value of Derivative Instruments
December 31, 2016
	Risk Management Contracts		Hedging Contracts						Gross Amounts of Risk Management Assets/ Liabilities Recognized		Gross Amounts Offset in the Statement of Financial Position (b)			Net Amounts of Assets/Liabilities Presented in the Statement of Financial Position (c)
Balance Sheet Location	Commodity (a)		Commodity (a)			Interest Rate and Foreign Currency (a)
	(in millions)
Current Risk Management Assets	$	264.4	$	13.2		$	—		$	277.6	$	(183.1	)	$	94.5
Long-term Risk Management Assets	315.0		7.7			—			322.7		(33.6		)	289.1
Total Assets	579.4		20.9			—			600.3		(216.7		)	383.6
Current Risk Management Liabilities	227.2		6.3			—			233.5		(180.1		)	53.4
Long-term Risk Management Liabilities	301.0		50.1			1.4			352.5		(36.3		)	316.2
Total Liabilities	528.2		56.4			1.4			586.0		(216.4		)	369.6
Total MTM Derivative Contract Net Assets (Liabilities)	$	51.2	$	(35.5	)	$	(1.4	)	$	14.3	$	(0.3	)	$	14.0

(a) Derivative instruments within these categories are reported gross.  These instruments are subject to master netting agreements and are presented on the balance sheets on a net basis in accordance with the accounting guidance for “Derivatives and Hedging.”

(b) Amounts include counterparty netting of risk management and hedging contracts and associated cash collateral in accordance with the accounting guidance for “Derivatives and Hedging.”

(c) There are no derivative contracts subject to a master netting arrangement or similar agreement which are not offset in the statement of financial position.

Amount of Gain (Loss) Recognized on Risk Management Contracts

Amount of Gain (Loss) Recognized on

Risk Management Contracts

For the Three Months Ended June 30, 2017

Location of Gain (Loss)	AEP			APCo			I&M		OPCo			PSO		SWEPCo
	(in millions)
Vertically Integrated Utility Revenues	$	0.6		$	—		$	—	$	—		$	—	$	—
Generation & Marketing Revenues	10.3			—			—		—			—		—
Electric Generation, Transmission and Distribution Revenues	—			(0.1		)	0.5		—			—		—
Purchased Electricity for Resale	1.5			0.5			0.2		—			—		—
Other Operation Expense	0.2			—			—		—			—		—
Maintenance Expense	0.1			—			—		—			—		—
Regulatory Assets (a)	(3.1		)	5.7			—		(8.6		)	—		—
Regulatory Liabilities (a)	41.0			13.6			6.4		—			8.7		10.4
Total Gain (Loss) on Risk Management Contracts	$	50.6		$	19.7		$	7.1	$	(8.6	)	$	8.7	$	10.4

Amount of Gain (Loss) Recognized on

Risk Management Contracts

For the Three Months Ended June 30, 2016

Location of Gain (Loss)	AEP			APCo			I&M		OPCo			PSO		SWEPCo
	(in millions)
Vertically Integrated Utilities Revenues	$	0.1		$	—		$	—	$	—		$	—	$	—
Generation & Marketing Revenues	21.1			—			—		—			—		—
Electric Generation, Transmission and Distribution Revenues	—			(1.0		)	0.9		—			—		—
Sales to AEP Affiliates	—			1.0			1.8		—			—		—
Purchased Electricity for Resale	1.3			0.5			—		—			—		—
Other Operation Expense	(0.2		)	—			—		(0.1		)	—		(0.1		)
Maintenance Expense	(0.4		)	—			—		(0.1		)	—		—
Regulatory Assets (a)	(14.3		)	(12.6		)	1.1		(5.6		)	0.3		2.6
Regulatory Liabilities (a)	17.1			6.4			1.8		—			2.9		6.5
Total Gain (Loss) on Risk Management Contracts	$	24.7		$	(5.7	)	$	5.6	$	(5.8	)	$	3.2	$	9.0

Amount of Gain (Loss) Recognized on

Risk Management Contracts

For the Six Months Ended June 30, 2017

Location of Gain (Loss)	AEP			APCo			I&M			OPCo			PSO		SWEPCo
	(in millions)
Vertically Integrated Utility Revenues	$	6.1		$	—		$	—		$	—		$	—	$	—
Generation & Marketing Revenues	20.8			—			—			—			—		—
Electric Generation, Transmission and Distribution Revenues	—			0.3			5.7			—			—		0.1
Purchased Electricity for Resale	3.9			1.3			0.3			—			—		—
Other Operation Expense	0.4			—			—			—			—		—
Maintenance Expense	0.3			—			—			—			—		—
Regulatory Assets (a)	(18.0		)	(0.1		)	(0.2		)	(17.2		)	—		(0.2		)
Regulatory Liabilities (a)	66.2			24.5			13.2			—			11.1		15.0
Total Gain (Loss) on Risk Management Contracts	$	79.7		$	26.0		$	19.0		$	(17.2	)	$	11.1	$	14.9

Amount of Gain (Loss) Recognized on

Risk Management Contracts

For the Six Months Ended June 30, 2016

Location of Gain (Loss)	AEP			APCo			I&M			OPCo			PSO			SWEPCo
	(in millions)
Vertically Integrated Utilities Revenues	$	0.7		$	—		$	—		$	—		$	—		$	—
Generation & Marketing Revenues	40.9			—			—			—			—			—
Electric Generation, Transmission and Distribution Revenues	—			(1.8		)	2.5			—			—			—
Sales to AEP Affiliates	—			2.1			5.8			—			—			—
Purchased Electricity for Resale	3.4			1.9			0.1			—			—			—
Other Operation Expense	(0.9		)	(0.1		)	(0.1		)	(0.2		)	(0.1		)	(0.2		)
Maintenance Expense	(1.2		)	(0.2		)	(0.1		)	(0.2		)	(0.1		)	(0.1		)
Regulatory Assets (a)	(28.4		)	(12.4		)	1.4			(20.5		)	0.3			2.7
Regulatory Liabilities (a)	29.3			22.3			5.7			(15.2		)	2.4			11.0
Total Gain (Loss) on Risk Management Contracts	$	43.8		$	11.8		$	15.3		$	(36.1	)	$	2.5		$	13.4

(a) Represents realized and unrealized gains and losses subject to regulatory accounting treatment recorded as either current or noncurrent on the balance sheets.

Gain (Loss) on Hedging Instruments

	Three Months Ended June 30,						Six Months Ended June 30,
	2017			2016			2017			2016
	(in millions)
Gain (Loss) on Fair Value Hedging Instruments	$	0.4		$	0.6		$	(0.1	)	$	4.1
Gain (Loss) on Fair Value Portion of Long-term Debt	(0.4		)	(0.6		)	0.1			(4.1		)

Impact of Cash Flow Hedges on the Condensed Balance Sheet

Impact of Cash Flow Hedges on AEP’s Balance Sheets

	June 30, 2017						December 31, 2016
	Commodity			Interest Rate			Commodity			Interest Rate
	(in millions)
Hedging Assets (a)	$	4.0		$	4.8		$	11.2		$	—
Hedging Liabilities (a)	59.2			—			46.7			—
AOCI Gain (Loss) Net of Tax	(36.0		)	(10.4		)	(23.1		)	(15.7		)
Portion Expected to be Reclassified to Net Income During the Next Twelve Months	(2.7		)	(0.7		)	4.3			(1.0		)

(a) Hedging Assets and Hedging Liabilities are included in Risk Management Assets and Liabilities on the balance sheets.

Collateral Required Under Various Triggering Events

	June 30, 2017					December 31, 2016
	Amount of Collateral		Amount of			Amount of Collateral		Amount of
	That Would		Collateral			That Would		Collateral
	Have Been Required		Attributable to			Have Been Required		Attributable to
	to Post Attributable		Other			to Post Attributable		Other
Company	to RTOs and ISOs		Contracts			to RTOs and ISOs		Contracts
	(in millions)
AEP	$	38.7	$	197.3	(a)	$	9.3	$	280.3	(a)
APCo	7.4		—			1.0		—
I&M	4.5		—			0.6		—
PSO	3.7		3.3			2.1		3.2
SWEPCo	6.2		0.1			2.5		0.1

(a) Represents the amount of collateral AEP subsidiaries would have been required to post for other significant non-derivative contracts including AGR jointly owned plant contracts and various other commodity related contacts.

Liabilities Subject to Cross Default Provisions

	June 30, 2017
	Liabilities for				Additional
	Contracts with Cross				Settlement
	Default Provisions				Liability if Cross
	Prior to Contractual		Amount of Cash		Default Provision
Company	Netting Arrangements		Collateral Posted		is Triggered
	(in millions)
AEP	$	247.0	$	2.3	$	234.1
APCo	—		—		—
I&M	—		—		—

	December 31, 2016
	Liabilities for				Additional
	Contracts with Cross				Settlement
	Default Provisions				Liability if Cross
	Prior to Contractual		Amount of Cash		Default Provision
Company	Netting Arrangements		Collateral Posted		is Triggered
	(in millions)
AEP	$	259.6	$	0.4	$	235.8
APCo	0.1		—		—
I&M	0.1		—		—

Appalachian Power Co [Member]

Notional Volume of Derivative Instruments

Notional Volume of Derivative Instruments

June 30, 2017

Primary Risk Exposure	Unit of Measure	AEP		APCo		I&M		OPCo		PSO		SWEPCo
		(in millions)
Commodity:
Power	MWhs	472.7		91.5		54.6		10.7		30.5		36.4
Coal	Tons	1.0		—		0.5		—		—		0.5
Natural Gas	MMBtus	26.6		1.9		1.1		—		—		—
Heating Oil and Gasoline	Gallons	7.4		1.4		0.7		1.7		0.7		0.9
Interest Rate	USD	$	62.0	$	—	$	—	$	—	$	—	$	—
Interest Rate	USD	$	1,000.0	$	—	$	—	$	—	$	—	$	—

Notional Volume of Derivative Instruments

December 31, 2016

Primary Risk Exposure	Unit of Measure	AEP		APCo		I&M		OPCo		PSO		SWEPCo
		(in millions)
Commodity:
Power	MWhs	348.0		51.9		19.9		11.2		11.9		14.2
Coal	Tons	1.5		—		0.5		—		—		1.0
Natural Gas	MMBtus	32.8		—		—		—		—		—
Heating Oil and Gasoline	Gallons	7.4		1.4		0.7		1.6		0.8		0.9
Interest Rate	USD	$	75.2	$	0.1	$	0.1	$	—	$	—	$	—
Interest Rate and Foreign Currency	USD	$	500.0	$	—	$	—	$	—	$	—	$	—

Cash Collateral Netting

	June 30, 2017				December 31, 2016
	Cash Collateral		Cash Collateral		Cash Collateral		Cash Collateral
	Received		Paid		Received		Paid
	Netted Against		Netted Against		Netted Against		Netted Against
	Risk Management		Risk Management		Risk Management		Risk Management
Company	Assets		Liabilities		Assets		Liabilities
	(in millions)
AEP	$	9.2	$	24.0	$	7.9	$	7.6
APCo	2.1		0.1		0.5		0.7
I&M	2.3		—		0.3		0.4
OPCo	—		—		0.2		—
PSO	—		—		0.1		—
SWEPCo	—		—		0.1		—

Fair Value of Derivative Instruments

APCo

Fair Value of Derivative Instruments

June 30, 2017

	Risk Management		Gross Amounts Offset			Net Amounts of Assets/Liabilities
	Contracts -		in the Statement of			Presented in the Statement
Balance Sheet Location	Commodity (a)		Financial Position (b)			of Financial Position (c)
	(in millions)
Current Risk Management Assets	$	72.3	$	(30.7	)	$	41.6
Long-term Risk Management Assets	6.6		(6.6		)	—
Total Assets	78.9		(37.3		)	41.6
Current Risk Management Liabilities	29.5		(29.1		)	0.4
Long-term Risk Management Liabilities	6.6		(6.2		)	0.4
Total Liabilities	36.1		(35.3		)	0.8
Total MTM Derivative Contract Net Assets (Liabilities)	$	42.8	$	(2.0	)	$	40.8

Fair Value of Derivative Instruments

December 31, 2016

	Risk Management		Gross Amounts Offset			Net Amounts of Assets/Liabilities
	Contracts -		in the Statement of			Presented in the Statement
Balance Sheet Location	Commodity (a)		Financial Position (b)			of Financial Position (c)
	(in millions)
Current Risk Management Assets	$	22.7	$	(20.1	)	$	2.6
Long-term Risk Management Assets	1.9		(1.9		)	—
Total Assets	24.6		(22.0		)	2.6
Current Risk Management Liabilities	20.6		(20.3		)	0.3
Long-term Risk Management Liabilities	2.8		(1.9		)	0.9
Total Liabilities	23.4		(22.2		)	1.2
Total MTM Derivative Contract Net Assets	$	1.2	$	0.2		$	1.4

(a) Derivative instruments within these categories are reported gross.  These instruments are subject to master netting agreements and are presented on the balance sheets on a net basis in accordance with the accounting guidance for “Derivatives and Hedging.”

(b) Amounts include counterparty netting of risk management and hedging contracts and associated cash collateral in accordance with the accounting guidance for “Derivatives and Hedging.”

(c) There are no derivative contracts subject to a master netting arrangement or similar agreement which are not offset in the statement of financial position.

Amount of Gain (Loss) Recognized on Risk Management Contracts

Amount of Gain (Loss) Recognized on

Risk Management Contracts

For the Three Months Ended June 30, 2017

Location of Gain (Loss)	AEP			APCo			I&M		OPCo			PSO		SWEPCo
	(in millions)
Vertically Integrated Utility Revenues	$	0.6		$	—		$	—	$	—		$	—	$	—
Generation & Marketing Revenues	10.3			—			—		—			—		—
Electric Generation, Transmission and Distribution Revenues	—			(0.1		)	0.5		—			—		—
Purchased Electricity for Resale	1.5			0.5			0.2		—			—		—
Other Operation Expense	0.2			—			—		—			—		—
Maintenance Expense	0.1			—			—		—			—		—
Regulatory Assets (a)	(3.1		)	5.7			—		(8.6		)	—		—
Regulatory Liabilities (a)	41.0			13.6			6.4		—			8.7		10.4
Total Gain (Loss) on Risk Management Contracts	$	50.6		$	19.7		$	7.1	$	(8.6	)	$	8.7	$	10.4

Amount of Gain (Loss) Recognized on

Risk Management Contracts

For the Three Months Ended June 30, 2016

Location of Gain (Loss)	AEP			APCo			I&M		OPCo			PSO		SWEPCo
	(in millions)
Vertically Integrated Utilities Revenues	$	0.1		$	—		$	—	$	—		$	—	$	—
Generation & Marketing Revenues	21.1			—			—		—			—		—
Electric Generation, Transmission and Distribution Revenues	—			(1.0		)	0.9		—			—		—
Sales to AEP Affiliates	—			1.0			1.8		—			—		—
Purchased Electricity for Resale	1.3			0.5			—		—			—		—
Other Operation Expense	(0.2		)	—			—		(0.1		)	—		(0.1		)
Maintenance Expense	(0.4		)	—			—		(0.1		)	—		—
Regulatory Assets (a)	(14.3		)	(12.6		)	1.1		(5.6		)	0.3		2.6
Regulatory Liabilities (a)	17.1			6.4			1.8		—			2.9		6.5
Total Gain (Loss) on Risk Management Contracts	$	24.7		$	(5.7	)	$	5.6	$	(5.8	)	$	3.2	$	9.0

Amount of Gain (Loss) Recognized on

Risk Management Contracts

For the Six Months Ended June 30, 2017

Location of Gain (Loss)	AEP			APCo			I&M			OPCo			PSO		SWEPCo
	(in millions)
Vertically Integrated Utility Revenues	$	6.1		$	—		$	—		$	—		$	—	$	—
Generation & Marketing Revenues	20.8			—			—			—			—		—
Electric Generation, Transmission and Distribution Revenues	—			0.3			5.7			—			—		0.1
Purchased Electricity for Resale	3.9			1.3			0.3			—			—		—
Other Operation Expense	0.4			—			—			—			—		—
Maintenance Expense	0.3			—			—			—			—		—
Regulatory Assets (a)	(18.0		)	(0.1		)	(0.2		)	(17.2		)	—		(0.2		)
Regulatory Liabilities (a)	66.2			24.5			13.2			—			11.1		15.0
Total Gain (Loss) on Risk Management Contracts	$	79.7		$	26.0		$	19.0		$	(17.2	)	$	11.1	$	14.9

Amount of Gain (Loss) Recognized on

Risk Management Contracts

For the Six Months Ended June 30, 2016

Location of Gain (Loss)	AEP			APCo			I&M			OPCo			PSO			SWEPCo
	(in millions)
Vertically Integrated Utilities Revenues	$	0.7		$	—		$	—		$	—		$	—		$	—
Generation & Marketing Revenues	40.9			—			—			—			—			—
Electric Generation, Transmission and Distribution Revenues	—			(1.8		)	2.5			—			—			—
Sales to AEP Affiliates	—			2.1			5.8			—			—			—
Purchased Electricity for Resale	3.4			1.9			0.1			—			—			—
Other Operation Expense	(0.9		)	(0.1		)	(0.1		)	(0.2		)	(0.1		)	(0.2		)
Maintenance Expense	(1.2		)	(0.2		)	(0.1		)	(0.2		)	(0.1		)	(0.1		)
Regulatory Assets (a)	(28.4		)	(12.4		)	1.4			(20.5		)	0.3			2.7
Regulatory Liabilities (a)	29.3			22.3			5.7			(15.2		)	2.4			11.0
Total Gain (Loss) on Risk Management Contracts	$	43.8		$	11.8		$	15.3		$	(36.1	)	$	2.5		$	13.4

(a) Represents realized and unrealized gains and losses subject to regulatory accounting treatment recorded as either current or noncurrent on the balance sheets.

Impact of Cash Flow Hedges on the Condensed Balance Sheet

Impact of Cash Flow Hedges on the Registrant Subsidiaries’ Balance Sheets

	June 30, 2017						December 31, 2016
	Interest Rate
				Expected to be						Expected to be
				Reclassified to						Reclassified to
				Net Income During						Net Income During
	AOCI Gain (Loss)			the Next			AOCI Gain (Loss)			the Next
Company	Net of Tax			Twelve Months			Net of Tax			Twelve Months
	(in millions)
APCo	$	2.5		$	0.7		$	2.9		$	0.7
I&M	(11.3		)	(1.3		)	(12.0		)	(1.3		)
OPCo	2.5			1.1			3.0			1.1
PSO	3.0			0.8			3.4			0.8
SWEPCo	(6.7		)	(1.4		)	(7.4		)	(1.4		)

Collateral Required Under Various Triggering Events

	June 30, 2017					December 31, 2016
	Amount of Collateral		Amount of			Amount of Collateral		Amount of
	That Would		Collateral			That Would		Collateral
	Have Been Required		Attributable to			Have Been Required		Attributable to
	to Post Attributable		Other			to Post Attributable		Other
Company	to RTOs and ISOs		Contracts			to RTOs and ISOs		Contracts
	(in millions)
AEP	$	38.7	$	197.3	(a)	$	9.3	$	280.3	(a)
APCo	7.4		—			1.0		—
I&M	4.5		—			0.6		—
PSO	3.7		3.3			2.1		3.2
SWEPCo	6.2		0.1			2.5		0.1

(a) Represents the amount of collateral AEP subsidiaries would have been required to post for other significant non-derivative contracts including AGR jointly owned plant contracts and various other commodity related contacts.

Liabilities Subject to Cross Default Provisions

	June 30, 2017
	Liabilities for				Additional
	Contracts with Cross				Settlement
	Default Provisions				Liability if Cross
	Prior to Contractual		Amount of Cash		Default Provision
Company	Netting Arrangements		Collateral Posted		is Triggered
	(in millions)
AEP	$	247.0	$	2.3	$	234.1
APCo	—		—		—
I&M	—		—		—

	December 31, 2016
	Liabilities for				Additional
	Contracts with Cross				Settlement
	Default Provisions				Liability if Cross
	Prior to Contractual		Amount of Cash		Default Provision
Company	Netting Arrangements		Collateral Posted		is Triggered
	(in millions)
AEP	$	259.6	$	0.4	$	235.8
APCo	0.1		—		—
I&M	0.1		—		—

Indiana Michigan Power Co [Member]

Notional Volume of Derivative Instruments

Notional Volume of Derivative Instruments

June 30, 2017

Primary Risk Exposure	Unit of Measure	AEP		APCo		I&M		OPCo		PSO		SWEPCo
		(in millions)
Commodity:
Power	MWhs	472.7		91.5		54.6		10.7		30.5		36.4
Coal	Tons	1.0		—		0.5		—		—		0.5
Natural Gas	MMBtus	26.6		1.9		1.1		—		—		—
Heating Oil and Gasoline	Gallons	7.4		1.4		0.7		1.7		0.7		0.9
Interest Rate	USD	$	62.0	$	—	$	—	$	—	$	—	$	—
Interest Rate	USD	$	1,000.0	$	—	$	—	$	—	$	—	$	—

Notional Volume of Derivative Instruments

December 31, 2016

Primary Risk Exposure	Unit of Measure	AEP		APCo		I&M		OPCo		PSO		SWEPCo
		(in millions)
Commodity:
Power	MWhs	348.0		51.9		19.9		11.2		11.9		14.2
Coal	Tons	1.5		—		0.5		—		—		1.0
Natural Gas	MMBtus	32.8		—		—		—		—		—
Heating Oil and Gasoline	Gallons	7.4		1.4		0.7		1.6		0.8		0.9
Interest Rate	USD	$	75.2	$	0.1	$	0.1	$	—	$	—	$	—
Interest Rate and Foreign Currency	USD	$	500.0	$	—	$	—	$	—	$	—	$	—

Cash Collateral Netting

	June 30, 2017				December 31, 2016
	Cash Collateral		Cash Collateral		Cash Collateral		Cash Collateral
	Received		Paid		Received		Paid
	Netted Against		Netted Against		Netted Against		Netted Against
	Risk Management		Risk Management		Risk Management		Risk Management
Company	Assets		Liabilities		Assets		Liabilities
	(in millions)
AEP	$	9.2	$	24.0	$	7.9	$	7.6
APCo	2.1		0.1		0.5		0.7
I&M	2.3		—		0.3		0.4
OPCo	—		—		0.2		—
PSO	—		—		0.1		—
SWEPCo	—		—		0.1		—

Fair Value of Derivative Instruments

I&M

Fair Value of Derivative Instruments

June 30, 2017

	Risk Management		Gross Amounts Offset			Net Amounts of Assets/Liabilities
	Contracts -		in the Statement of			Presented in the Statement
Balance Sheet Location	Commodity (a)		Financial Position (b)			of Financial Position (c)
	(in millions)
Current Risk Management Assets	$	37.9	$	(22.1	)	$	15.8
Long-term Risk Management Assets	4.2		(4.2		)	—
Total Assets	42.1		(26.3		)	15.8
Current Risk Management Liabilities	21.1		(20.2		)	0.9
Long-term Risk Management Liabilities	4.0		(3.8		)	0.2
Total Liabilities	25.1		(24.0		)	1.1
Total MTM Derivative Contract Net Assets (Liabilities)	$	17.0	$	(2.3	)	$	14.7

Fair Value of Derivative Instruments

December 31, 2016

	Risk Management		Gross Amounts Offset			Net Amounts of Assets/Liabilities
	Contracts -		in the Statement of			Presented in the Statement
Balance Sheet Location	Commodity (a)		Financial Position (b)			of Financial Position (c)
	(in millions)
Current Risk Management Assets	$	14.9	$	(11.4	)	$	3.5
Long-term Risk Management Assets	1.1		(1.1		)	—
Total Assets	16.0		(12.5		)	3.5
Current Risk Management Liabilities	11.8		(11.5		)	0.3
Long-term Risk Management Liabilities	1.9		(1.1		)	0.8
Total Liabilities	13.7		(12.6		)	1.1
Total MTM Derivative Contract Net Assets	$	2.3	$	0.1		$	2.4

(a) Derivative instruments within these categories are reported gross.  These instruments are subject to master netting agreements and are presented on the balance sheets on a net basis in accordance with the accounting guidance for “Derivatives and Hedging.”

(b) Amounts include counterparty netting of risk management and hedging contracts and associated cash collateral in accordance with the accounting guidance for “Derivatives and Hedging.”

(c) There are no derivative contracts subject to a master netting arrangement or similar agreement which are not offset in the statement of financial position.

Amount of Gain (Loss) Recognized on Risk Management Contracts

Amount of Gain (Loss) Recognized on

Risk Management Contracts

For the Three Months Ended June 30, 2017

Location of Gain (Loss)	AEP			APCo			I&M		OPCo			PSO		SWEPCo
	(in millions)
Vertically Integrated Utility Revenues	$	0.6		$	—		$	—	$	—		$	—	$	—
Generation & Marketing Revenues	10.3			—			—		—			—		—
Electric Generation, Transmission and Distribution Revenues	—			(0.1		)	0.5		—			—		—
Purchased Electricity for Resale	1.5			0.5			0.2		—			—		—
Other Operation Expense	0.2			—			—		—			—		—
Maintenance Expense	0.1			—			—		—			—		—
Regulatory Assets (a)	(3.1		)	5.7			—		(8.6		)	—		—
Regulatory Liabilities (a)	41.0			13.6			6.4		—			8.7		10.4
Total Gain (Loss) on Risk Management Contracts	$	50.6		$	19.7		$	7.1	$	(8.6	)	$	8.7	$	10.4

Amount of Gain (Loss) Recognized on

Risk Management Contracts

For the Three Months Ended June 30, 2016

Location of Gain (Loss)	AEP			APCo			I&M		OPCo			PSO		SWEPCo
	(in millions)
Vertically Integrated Utilities Revenues	$	0.1		$	—		$	—	$	—		$	—	$	—
Generation & Marketing Revenues	21.1			—			—		—			—		—
Electric Generation, Transmission and Distribution Revenues	—			(1.0		)	0.9		—			—		—
Sales to AEP Affiliates	—			1.0			1.8		—			—		—
Purchased Electricity for Resale	1.3			0.5			—		—			—		—
Other Operation Expense	(0.2		)	—			—		(0.1		)	—		(0.1		)
Maintenance Expense	(0.4		)	—			—		(0.1		)	—		—
Regulatory Assets (a)	(14.3		)	(12.6		)	1.1		(5.6		)	0.3		2.6
Regulatory Liabilities (a)	17.1			6.4			1.8		—			2.9		6.5
Total Gain (Loss) on Risk Management Contracts	$	24.7		$	(5.7	)	$	5.6	$	(5.8	)	$	3.2	$	9.0

Amount of Gain (Loss) Recognized on

Risk Management Contracts

For the Six Months Ended June 30, 2017

Location of Gain (Loss)	AEP			APCo			I&M			OPCo			PSO		SWEPCo
	(in millions)
Vertically Integrated Utility Revenues	$	6.1		$	—		$	—		$	—		$	—	$	—
Generation & Marketing Revenues	20.8			—			—			—			—		—
Electric Generation, Transmission and Distribution Revenues	—			0.3			5.7			—			—		0.1
Purchased Electricity for Resale	3.9			1.3			0.3			—			—		—
Other Operation Expense	0.4			—			—			—			—		—
Maintenance Expense	0.3			—			—			—			—		—
Regulatory Assets (a)	(18.0		)	(0.1		)	(0.2		)	(17.2		)	—		(0.2		)
Regulatory Liabilities (a)	66.2			24.5			13.2			—			11.1		15.0
Total Gain (Loss) on Risk Management Contracts	$	79.7		$	26.0		$	19.0		$	(17.2	)	$	11.1	$	14.9

Amount of Gain (Loss) Recognized on

Risk Management Contracts

For the Six Months Ended June 30, 2016

Location of Gain (Loss)	AEP			APCo			I&M			OPCo			PSO			SWEPCo
	(in millions)
Vertically Integrated Utilities Revenues	$	0.7		$	—		$	—		$	—		$	—		$	—
Generation & Marketing Revenues	40.9			—			—			—			—			—
Electric Generation, Transmission and Distribution Revenues	—			(1.8		)	2.5			—			—			—
Sales to AEP Affiliates	—			2.1			5.8			—			—			—
Purchased Electricity for Resale	3.4			1.9			0.1			—			—			—
Other Operation Expense	(0.9		)	(0.1		)	(0.1		)	(0.2		)	(0.1		)	(0.2		)
Maintenance Expense	(1.2		)	(0.2		)	(0.1		)	(0.2		)	(0.1		)	(0.1		)
Regulatory Assets (a)	(28.4		)	(12.4		)	1.4			(20.5		)	0.3			2.7
Regulatory Liabilities (a)	29.3			22.3			5.7			(15.2		)	2.4			11.0
Total Gain (Loss) on Risk Management Contracts	$	43.8		$	11.8		$	15.3		$	(36.1	)	$	2.5		$	13.4

(a) Represents realized and unrealized gains and losses subject to regulatory accounting treatment recorded as either current or noncurrent on the balance sheets.

Impact of Cash Flow Hedges on the Condensed Balance Sheet

Impact of Cash Flow Hedges on the Registrant Subsidiaries’ Balance Sheets

	June 30, 2017						December 31, 2016
	Interest Rate
				Expected to be						Expected to be
				Reclassified to						Reclassified to
				Net Income During						Net Income During
	AOCI Gain (Loss)			the Next			AOCI Gain (Loss)			the Next
Company	Net of Tax			Twelve Months			Net of Tax			Twelve Months
	(in millions)
APCo	$	2.5		$	0.7		$	2.9		$	0.7
I&M	(11.3		)	(1.3		)	(12.0		)	(1.3		)
OPCo	2.5			1.1			3.0			1.1
PSO	3.0			0.8			3.4			0.8
SWEPCo	(6.7		)	(1.4		)	(7.4		)	(1.4		)

Collateral Required Under Various Triggering Events

	June 30, 2017					December 31, 2016
	Amount of Collateral		Amount of			Amount of Collateral		Amount of
	That Would		Collateral			That Would		Collateral
	Have Been Required		Attributable to			Have Been Required		Attributable to
	to Post Attributable		Other			to Post Attributable		Other
Company	to RTOs and ISOs		Contracts			to RTOs and ISOs		Contracts
	(in millions)
AEP	$	38.7	$	197.3	(a)	$	9.3	$	280.3	(a)
APCo	7.4		—			1.0		—
I&M	4.5		—			0.6		—
PSO	3.7		3.3			2.1		3.2
SWEPCo	6.2		0.1			2.5		0.1

(a) Represents the amount of collateral AEP subsidiaries would have been required to post for other significant non-derivative contracts including AGR jointly owned plant contracts and various other commodity related contacts.

Liabilities Subject to Cross Default Provisions

	June 30, 2017
	Liabilities for				Additional
	Contracts with Cross				Settlement
	Default Provisions				Liability if Cross
	Prior to Contractual		Amount of Cash		Default Provision
Company	Netting Arrangements		Collateral Posted		is Triggered
	(in millions)
AEP	$	247.0	$	2.3	$	234.1
APCo	—		—		—
I&M	—		—		—

	December 31, 2016
	Liabilities for				Additional
	Contracts with Cross				Settlement
	Default Provisions				Liability if Cross
	Prior to Contractual		Amount of Cash		Default Provision
Company	Netting Arrangements		Collateral Posted		is Triggered
	(in millions)
AEP	$	259.6	$	0.4	$	235.8
APCo	0.1		—		—
I&M	0.1		—		—

Ohio Power Co [Member]

Notional Volume of Derivative Instruments

Notional Volume of Derivative Instruments

June 30, 2017

Primary Risk Exposure	Unit of Measure	AEP		APCo		I&M		OPCo		PSO		SWEPCo
		(in millions)
Commodity:
Power	MWhs	472.7		91.5		54.6		10.7		30.5		36.4
Coal	Tons	1.0		—		0.5		—		—		0.5
Natural Gas	MMBtus	26.6		1.9		1.1		—		—		—
Heating Oil and Gasoline	Gallons	7.4		1.4		0.7		1.7		0.7		0.9
Interest Rate	USD	$	62.0	$	—	$	—	$	—	$	—	$	—
Interest Rate	USD	$	1,000.0	$	—	$	—	$	—	$	—	$	—

Notional Volume of Derivative Instruments

December 31, 2016

Primary Risk Exposure	Unit of Measure	AEP		APCo		I&M		OPCo		PSO		SWEPCo
		(in millions)
Commodity:
Power	MWhs	348.0		51.9		19.9		11.2		11.9		14.2
Coal	Tons	1.5		—		0.5		—		—		1.0
Natural Gas	MMBtus	32.8		—		—		—		—		—
Heating Oil and Gasoline	Gallons	7.4		1.4		0.7		1.6		0.8		0.9
Interest Rate	USD	$	75.2	$	0.1	$	0.1	$	—	$	—	$	—
Interest Rate and Foreign Currency	USD	$	500.0	$	—	$	—	$	—	$	—	$	—

Cash Collateral Netting

	June 30, 2017				December 31, 2016
	Cash Collateral		Cash Collateral		Cash Collateral		Cash Collateral
	Received		Paid		Received		Paid
	Netted Against		Netted Against		Netted Against		Netted Against
	Risk Management		Risk Management		Risk Management		Risk Management
Company	Assets		Liabilities		Assets		Liabilities
	(in millions)
AEP	$	9.2	$	24.0	$	7.9	$	7.6
APCo	2.1		0.1		0.5		0.7
I&M	2.3		—		0.3		0.4
OPCo	—		—		0.2		—
PSO	—		—		0.1		—
SWEPCo	—		—		0.1		—

Fair Value of Derivative Instruments

OPCo

Fair Value of Derivative Instruments

June 30, 2017

	Risk Management			Gross Amounts Offset		Net Amounts of Assets/Liabilities
	Contracts -			in the Statement of		Presented in the Statement
Balance Sheet Location	Commodity (a)			Financial Position (b)		of Financial Position (c)
	(in millions)
Current Risk Management Assets	$	—		$	—	$	—
Long-term Risk Management Assets	—			—		—
Total Assets	—			—		—
Current Risk Management Liabilities	7.1			—		7.1
Long-term Risk Management Liabilities	123.5			—		123.5
Total Liabilities	130.6			—		130.6
Total MTM Derivative Contract Net Liabilities	$	(130.6	)	$	—	$	(130.6	)

Fair Value of Derivative Instruments

December 31, 2016

	Risk Management			Gross Amounts Offset			Net Amounts of Assets/Liabilities
	Contracts -			in the Statement of			Presented in the Statement
Balance Sheet Location	Commodity (a)			Financial Position (b)			of Financial Position (c)
	(in millions)
Current Risk Management Assets	$	0.4		$	(0.2	)	$	0.2
Long-term Risk Management Assets	—			—			—
Total Assets	0.4			(0.2		)	0.2
Current Risk Management Liabilities	5.9			—			5.9
Long-term Risk Management Liabilities	113.1			—			113.1
Total Liabilities	119.0			—			119.0
Total MTM Derivative Contract Net Liabilities	$	(118.6	)	$	(0.2	)	$	(118.8	)

(a) Derivative instruments within these categories are reported gross.  These instruments are subject to master netting agreements and are presented on the balance sheets on a net basis in accordance with the accounting guidance for “Derivatives and Hedging.”

(b) Amounts include counterparty netting of risk management and hedging contracts and associated cash collateral in accordance with the accounting guidance for “Derivatives and Hedging.”

(c) There are no derivative contracts subject to a master netting arrangement or similar agreement which are not offset in the statement of financial position.

Amount of Gain (Loss) Recognized on Risk Management Contracts

Amount of Gain (Loss) Recognized on

Risk Management Contracts

For the Three Months Ended June 30, 2017

Location of Gain (Loss)	AEP			APCo			I&M		OPCo			PSO		SWEPCo
	(in millions)
Vertically Integrated Utility Revenues	$	0.6		$	—		$	—	$	—		$	—	$	—
Generation & Marketing Revenues	10.3			—			—		—			—		—
Electric Generation, Transmission and Distribution Revenues	—			(0.1		)	0.5		—			—		—
Purchased Electricity for Resale	1.5			0.5			0.2		—			—		—
Other Operation Expense	0.2			—			—		—			—		—
Maintenance Expense	0.1			—			—		—			—		—
Regulatory Assets (a)	(3.1		)	5.7			—		(8.6		)	—		—
Regulatory Liabilities (a)	41.0			13.6			6.4		—			8.7		10.4
Total Gain (Loss) on Risk Management Contracts	$	50.6		$	19.7		$	7.1	$	(8.6	)	$	8.7	$	10.4

Amount of Gain (Loss) Recognized on

Risk Management Contracts

For the Three Months Ended June 30, 2016

Location of Gain (Loss)	AEP			APCo			I&M		OPCo			PSO		SWEPCo
	(in millions)
Vertically Integrated Utilities Revenues	$	0.1		$	—		$	—	$	—		$	—	$	—
Generation & Marketing Revenues	21.1			—			—		—			—		—
Electric Generation, Transmission and Distribution Revenues	—			(1.0		)	0.9		—			—		—
Sales to AEP Affiliates	—			1.0			1.8		—			—		—
Purchased Electricity for Resale	1.3			0.5			—		—			—		—
Other Operation Expense	(0.2		)	—			—		(0.1		)	—		(0.1		)
Maintenance Expense	(0.4		)	—			—		(0.1		)	—		—
Regulatory Assets (a)	(14.3		)	(12.6		)	1.1		(5.6		)	0.3		2.6
Regulatory Liabilities (a)	17.1			6.4			1.8		—			2.9		6.5
Total Gain (Loss) on Risk Management Contracts	$	24.7		$	(5.7	)	$	5.6	$	(5.8	)	$	3.2	$	9.0

Amount of Gain (Loss) Recognized on

Risk Management Contracts

For the Six Months Ended June 30, 2017

Location of Gain (Loss)	AEP			APCo			I&M			OPCo			PSO		SWEPCo
	(in millions)
Vertically Integrated Utility Revenues	$	6.1		$	—		$	—		$	—		$	—	$	—
Generation & Marketing Revenues	20.8			—			—			—			—		—
Electric Generation, Transmission and Distribution Revenues	—			0.3			5.7			—			—		0.1
Purchased Electricity for Resale	3.9			1.3			0.3			—			—		—
Other Operation Expense	0.4			—			—			—			—		—
Maintenance Expense	0.3			—			—			—			—		—
Regulatory Assets (a)	(18.0		)	(0.1		)	(0.2		)	(17.2		)	—		(0.2		)
Regulatory Liabilities (a)	66.2			24.5			13.2			—			11.1		15.0
Total Gain (Loss) on Risk Management Contracts	$	79.7		$	26.0		$	19.0		$	(17.2	)	$	11.1	$	14.9

Amount of Gain (Loss) Recognized on

Risk Management Contracts

For the Six Months Ended June 30, 2016

Location of Gain (Loss)	AEP			APCo			I&M			OPCo			PSO			SWEPCo
	(in millions)
Vertically Integrated Utilities Revenues	$	0.7		$	—		$	—		$	—		$	—		$	—
Generation & Marketing Revenues	40.9			—			—			—			—			—
Electric Generation, Transmission and Distribution Revenues	—			(1.8		)	2.5			—			—			—
Sales to AEP Affiliates	—			2.1			5.8			—			—			—
Purchased Electricity for Resale	3.4			1.9			0.1			—			—			—
Other Operation Expense	(0.9		)	(0.1		)	(0.1		)	(0.2		)	(0.1		)	(0.2		)
Maintenance Expense	(1.2		)	(0.2		)	(0.1		)	(0.2		)	(0.1		)	(0.1		)
Regulatory Assets (a)	(28.4		)	(12.4		)	1.4			(20.5		)	0.3			2.7
Regulatory Liabilities (a)	29.3			22.3			5.7			(15.2		)	2.4			11.0
Total Gain (Loss) on Risk Management Contracts	$	43.8		$	11.8		$	15.3		$	(36.1	)	$	2.5		$	13.4

(a) Represents realized and unrealized gains and losses subject to regulatory accounting treatment recorded as either current or noncurrent on the balance sheets.

Impact of Cash Flow Hedges on the Condensed Balance Sheet

Impact of Cash Flow Hedges on the Registrant Subsidiaries’ Balance Sheets

	June 30, 2017						December 31, 2016
	Interest Rate
				Expected to be						Expected to be
				Reclassified to						Reclassified to
				Net Income During						Net Income During
	AOCI Gain (Loss)			the Next			AOCI Gain (Loss)			the Next
Company	Net of Tax			Twelve Months			Net of Tax			Twelve Months
	(in millions)
APCo	$	2.5		$	0.7		$	2.9		$	0.7
I&M	(11.3		)	(1.3		)	(12.0		)	(1.3		)
OPCo	2.5			1.1			3.0			1.1
PSO	3.0			0.8			3.4			0.8
SWEPCo	(6.7		)	(1.4		)	(7.4		)	(1.4		)

Public Service Co Of Oklahoma [Member]

Notional Volume of Derivative Instruments

Notional Volume of Derivative Instruments

June 30, 2017

Primary Risk Exposure	Unit of Measure	AEP		APCo		I&M		OPCo		PSO		SWEPCo
		(in millions)
Commodity:
Power	MWhs	472.7		91.5		54.6		10.7		30.5		36.4
Coal	Tons	1.0		—		0.5		—		—		0.5
Natural Gas	MMBtus	26.6		1.9		1.1		—		—		—
Heating Oil and Gasoline	Gallons	7.4		1.4		0.7		1.7		0.7		0.9
Interest Rate	USD	$	62.0	$	—	$	—	$	—	$	—	$	—
Interest Rate	USD	$	1,000.0	$	—	$	—	$	—	$	—	$	—

Notional Volume of Derivative Instruments

December 31, 2016

Primary Risk Exposure	Unit of Measure	AEP		APCo		I&M		OPCo		PSO		SWEPCo
		(in millions)
Commodity:
Power	MWhs	348.0		51.9		19.9		11.2		11.9		14.2
Coal	Tons	1.5		—		0.5		—		—		1.0
Natural Gas	MMBtus	32.8		—		—		—		—		—
Heating Oil and Gasoline	Gallons	7.4		1.4		0.7		1.6		0.8		0.9
Interest Rate	USD	$	75.2	$	0.1	$	0.1	$	—	$	—	$	—
Interest Rate and Foreign Currency	USD	$	500.0	$	—	$	—	$	—	$	—	$	—

Cash Collateral Netting

	June 30, 2017				December 31, 2016
	Cash Collateral		Cash Collateral		Cash Collateral		Cash Collateral
	Received		Paid		Received		Paid
	Netted Against		Netted Against		Netted Against		Netted Against
	Risk Management		Risk Management		Risk Management		Risk Management
Company	Assets		Liabilities		Assets		Liabilities
	(in millions)
AEP	$	9.2	$	24.0	$	7.9	$	7.6
APCo	2.1		0.1		0.5		0.7
I&M	2.3		—		0.3		0.4
OPCo	—		—		0.2		—
PSO	—		—		0.1		—
SWEPCo	—		—		0.1		—

Fair Value of Derivative Instruments

PSO

Fair Value of Derivative Instruments

June 30, 2017

	Risk Management		Gross Amounts Offset			Net Amounts of Assets/Liabilities
	Contracts -		in the Statement of			Presented in the Statement
Balance Sheet Location	Commodity (a)		Financial Position (b)			of Financial Position (c)
	(in millions)
Current Risk Management Assets	$	9.9	$	(0.4	)	$	9.5
Long-term Risk Management Assets	—		—			—
Total Assets	9.9		(0.4		)	9.5
Current Risk Management Liabilities	0.4		(0.4		)	—
Long-term Risk Management Liabilities	—		—			—
Total Liabilities	0.4		(0.4		)	—
Total MTM Derivative Contract Net Assets	$	9.5	$	—		$	9.5

Fair Value of Derivative Instruments

December 31, 2016

	Risk Management		Gross Amounts Offset			Net Amounts of Assets/Liabilities
	Contracts -		in the Statement of			Presented in the Statement
Balance Sheet Location	Commodity (a)		Financial Position (b)			of Financial Position (c)
	(in millions)
Current Risk Management Assets	$	0.9	$	(0.1	)	$	0.8
Long-term Risk Management Assets	—		—			—
Total Assets	0.9		(0.1		)	0.8
Current Risk Management Liabilities	—		—			—
Long-term Risk Management Liabilities	—		—			—
Total Liabilities	—		—			—
Total MTM Derivative Contract Net Assets (Liabilities)	$	0.9	$	(0.1	)	$	0.8

(a) Derivative instruments within these categories are reported gross.  These instruments are subject to master netting agreements and are presented on the balance sheets on a net basis in accordance with the accounting guidance for “Derivatives and Hedging.”

(b) Amounts include counterparty netting of risk management and hedging contracts and associated cash collateral in accordance with the accounting guidance for “Derivatives and Hedging.”

(c) There are no derivative contracts subject to a master netting arrangement or similar agreement which are not offset in the statement of financial position.

Amount of Gain (Loss) Recognized on Risk Management Contracts

Amount of Gain (Loss) Recognized on

Risk Management Contracts

For the Three Months Ended June 30, 2017

Location of Gain (Loss)	AEP			APCo			I&M		OPCo			PSO		SWEPCo
	(in millions)
Vertically Integrated Utility Revenues	$	0.6		$	—		$	—	$	—		$	—	$	—
Generation & Marketing Revenues	10.3			—			—		—			—		—
Electric Generation, Transmission and Distribution Revenues	—			(0.1		)	0.5		—			—		—
Purchased Electricity for Resale	1.5			0.5			0.2		—			—		—
Other Operation Expense	0.2			—			—		—			—		—
Maintenance Expense	0.1			—			—		—			—		—
Regulatory Assets (a)	(3.1		)	5.7			—		(8.6		)	—		—
Regulatory Liabilities (a)	41.0			13.6			6.4		—			8.7		10.4
Total Gain (Loss) on Risk Management Contracts	$	50.6		$	19.7		$	7.1	$	(8.6	)	$	8.7	$	10.4

Amount of Gain (Loss) Recognized on

Risk Management Contracts

For the Three Months Ended June 30, 2016

Location of Gain (Loss)	AEP			APCo			I&M		OPCo			PSO		SWEPCo
	(in millions)
Vertically Integrated Utilities Revenues	$	0.1		$	—		$	—	$	—		$	—	$	—
Generation & Marketing Revenues	21.1			—			—		—			—		—
Electric Generation, Transmission and Distribution Revenues	—			(1.0		)	0.9		—			—		—
Sales to AEP Affiliates	—			1.0			1.8		—			—		—
Purchased Electricity for Resale	1.3			0.5			—		—			—		—
Other Operation Expense	(0.2		)	—			—		(0.1		)	—		(0.1		)
Maintenance Expense	(0.4		)	—			—		(0.1		)	—		—
Regulatory Assets (a)	(14.3		)	(12.6		)	1.1		(5.6		)	0.3		2.6
Regulatory Liabilities (a)	17.1			6.4			1.8		—			2.9		6.5
Total Gain (Loss) on Risk Management Contracts	$	24.7		$	(5.7	)	$	5.6	$	(5.8	)	$	3.2	$	9.0

Amount of Gain (Loss) Recognized on

Risk Management Contracts

For the Six Months Ended June 30, 2017

Location of Gain (Loss)	AEP			APCo			I&M			OPCo			PSO		SWEPCo
	(in millions)
Vertically Integrated Utility Revenues	$	6.1		$	—		$	—		$	—		$	—	$	—
Generation & Marketing Revenues	20.8			—			—			—			—		—
Electric Generation, Transmission and Distribution Revenues	—			0.3			5.7			—			—		0.1
Purchased Electricity for Resale	3.9			1.3			0.3			—			—		—
Other Operation Expense	0.4			—			—			—			—		—
Maintenance Expense	0.3			—			—			—			—		—
Regulatory Assets (a)	(18.0		)	(0.1		)	(0.2		)	(17.2		)	—		(0.2		)
Regulatory Liabilities (a)	66.2			24.5			13.2			—			11.1		15.0
Total Gain (Loss) on Risk Management Contracts	$	79.7		$	26.0		$	19.0		$	(17.2	)	$	11.1	$	14.9

Amount of Gain (Loss) Recognized on

Risk Management Contracts

For the Six Months Ended June 30, 2016

Location of Gain (Loss)	AEP			APCo			I&M			OPCo			PSO			SWEPCo
	(in millions)
Vertically Integrated Utilities Revenues	$	0.7		$	—		$	—		$	—		$	—		$	—
Generation & Marketing Revenues	40.9			—			—			—			—			—
Electric Generation, Transmission and Distribution Revenues	—			(1.8		)	2.5			—			—			—
Sales to AEP Affiliates	—			2.1			5.8			—			—			—
Purchased Electricity for Resale	3.4			1.9			0.1			—			—			—
Other Operation Expense	(0.9		)	(0.1		)	(0.1		)	(0.2		)	(0.1		)	(0.2		)
Maintenance Expense	(1.2		)	(0.2		)	(0.1		)	(0.2		)	(0.1		)	(0.1		)
Regulatory Assets (a)	(28.4		)	(12.4		)	1.4			(20.5		)	0.3			2.7
Regulatory Liabilities (a)	29.3			22.3			5.7			(15.2		)	2.4			11.0
Total Gain (Loss) on Risk Management Contracts	$	43.8		$	11.8		$	15.3		$	(36.1	)	$	2.5		$	13.4

(a) Represents realized and unrealized gains and losses subject to regulatory accounting treatment recorded as either current or noncurrent on the balance sheets.

Impact of Cash Flow Hedges on the Condensed Balance Sheet

Impact of Cash Flow Hedges on the Registrant Subsidiaries’ Balance Sheets

	June 30, 2017						December 31, 2016
	Interest Rate
				Expected to be						Expected to be
				Reclassified to						Reclassified to
				Net Income During						Net Income During
	AOCI Gain (Loss)			the Next			AOCI Gain (Loss)			the Next
Company	Net of Tax			Twelve Months			Net of Tax			Twelve Months
	(in millions)
APCo	$	2.5		$	0.7		$	2.9		$	0.7
I&M	(11.3		)	(1.3		)	(12.0		)	(1.3		)
OPCo	2.5			1.1			3.0			1.1
PSO	3.0			0.8			3.4			0.8
SWEPCo	(6.7		)	(1.4		)	(7.4		)	(1.4		)

Collateral Required Under Various Triggering Events

	June 30, 2017					December 31, 2016
	Amount of Collateral		Amount of			Amount of Collateral		Amount of
	That Would		Collateral			That Would		Collateral
	Have Been Required		Attributable to			Have Been Required		Attributable to
	to Post Attributable		Other			to Post Attributable		Other
Company	to RTOs and ISOs		Contracts			to RTOs and ISOs		Contracts
	(in millions)
AEP	$	38.7	$	197.3	(a)	$	9.3	$	280.3	(a)
APCo	7.4		—			1.0		—
I&M	4.5		—			0.6		—
PSO	3.7		3.3			2.1		3.2
SWEPCo	6.2		0.1			2.5		0.1

(a) Represents the amount of collateral AEP subsidiaries would have been required to post for other significant non-derivative contracts including AGR jointly owned plant contracts and various other commodity related contacts.

Southwestern Electric Power Co [Member]

Notional Volume of Derivative Instruments

Notional Volume of Derivative Instruments

June 30, 2017

Primary Risk Exposure	Unit of Measure	AEP		APCo		I&M		OPCo		PSO		SWEPCo
		(in millions)
Commodity:
Power	MWhs	472.7		91.5		54.6		10.7		30.5		36.4
Coal	Tons	1.0		—		0.5		—		—		0.5
Natural Gas	MMBtus	26.6		1.9		1.1		—		—		—
Heating Oil and Gasoline	Gallons	7.4		1.4		0.7		1.7		0.7		0.9
Interest Rate	USD	$	62.0	$	—	$	—	$	—	$	—	$	—
Interest Rate	USD	$	1,000.0	$	—	$	—	$	—	$	—	$	—

Notional Volume of Derivative Instruments

December 31, 2016

Primary Risk Exposure	Unit of Measure	AEP		APCo		I&M		OPCo		PSO		SWEPCo
		(in millions)
Commodity:
Power	MWhs	348.0		51.9		19.9		11.2		11.9		14.2
Coal	Tons	1.5		—		0.5		—		—		1.0
Natural Gas	MMBtus	32.8		—		—		—		—		—
Heating Oil and Gasoline	Gallons	7.4		1.4		0.7		1.6		0.8		0.9
Interest Rate	USD	$	75.2	$	0.1	$	0.1	$	—	$	—	$	—
Interest Rate and Foreign Currency	USD	$	500.0	$	—	$	—	$	—	$	—	$	—

Cash Collateral Netting

	June 30, 2017				December 31, 2016
	Cash Collateral		Cash Collateral		Cash Collateral		Cash Collateral
	Received		Paid		Received		Paid
	Netted Against		Netted Against		Netted Against		Netted Against
	Risk Management		Risk Management		Risk Management		Risk Management
Company	Assets		Liabilities		Assets		Liabilities
	(in millions)
AEP	$	9.2	$	24.0	$	7.9	$	7.6
APCo	2.1		0.1		0.5		0.7
I&M	2.3		—		0.3		0.4
OPCo	—		—		0.2		—
PSO	—		—		0.1		—
SWEPCo	—		—		0.1		—

Fair Value of Derivative Instruments

SWEPCo

Fair Value of Derivative Instruments

June 30, 2017

	Risk Management		Gross Amounts Offset			Net Amounts of Assets/Liabilities
	Contracts -		in the Statement of			Presented in the Statement
Balance Sheet Location	Commodity (a)		Financial Position (b)			of Financial Position (c)
	(in millions)
Current Risk Management Assets	$	12.9	$	(0.4	)	$	12.5
Long-term Risk Management Assets	—		—			—
Total Assets	12.9		(0.4		)	12.5
Current Risk Management Liabilities	0.9		(0.4		)	0.5
Long-term Risk Management Liabilities	—		—			—
Total Liabilities	0.9		(0.4		)	0.5
Total MTM Derivative Contract Net Assets	$	12.0	$	—		$	12.0

Fair Value of Derivative Instruments

December 31, 2016

	Risk Management		Gross Amounts Offset			Net Amounts of Assets/Liabilities
	Contracts -		in the Statement of			Presented in the Statement
Balance Sheet Location	Commodity (a)		Financial Position (b)			of Financial Position (c)
	(in millions)
Current Risk Management Assets	$	1.1	$	(0.2	)	$	0.9
Long-term Risk Management Assets	—		—			—
Total Assets	1.1		(0.2		)	0.9
Current Risk Management Liabilities	0.4		(0.1		)	0.3
Long-term Risk Management Liabilities	—		—			—
Total Liabilities	0.4		(0.1		)	0.3
Total MTM Derivative Contract Net Assets (Liabilities)	$	0.7	$	(0.1	)	$	0.6

(a) Derivative instruments within these categories are reported gross.  These instruments are subject to master netting agreements and are presented on the balance sheets on a net basis in accordance with the accounting guidance for “Derivatives and Hedging.”

(b) Amounts include counterparty netting of risk management and hedging contracts and associated cash collateral in accordance with the accounting guidance for “Derivatives and Hedging.”

(c) There are no derivative contracts subject to a master netting arrangement or similar agreement which are not offset in the statement of financial position.

Amount of Gain (Loss) Recognized on Risk Management Contracts

Amount of Gain (Loss) Recognized on

Risk Management Contracts

For the Three Months Ended June 30, 2017

Location of Gain (Loss)	AEP			APCo			I&M		OPCo			PSO		SWEPCo
	(in millions)
Vertically Integrated Utility Revenues	$	0.6		$	—		$	—	$	—		$	—	$	—
Generation & Marketing Revenues	10.3			—			—		—			—		—
Electric Generation, Transmission and Distribution Revenues	—			(0.1		)	0.5		—			—		—
Purchased Electricity for Resale	1.5			0.5			0.2		—			—		—
Other Operation Expense	0.2			—			—		—			—		—
Maintenance Expense	0.1			—			—		—			—		—
Regulatory Assets (a)	(3.1		)	5.7			—		(8.6		)	—		—
Regulatory Liabilities (a)	41.0			13.6			6.4		—			8.7		10.4
Total Gain (Loss) on Risk Management Contracts	$	50.6		$	19.7		$	7.1	$	(8.6	)	$	8.7	$	10.4

Amount of Gain (Loss) Recognized on

Risk Management Contracts

For the Three Months Ended June 30, 2016

Location of Gain (Loss)	AEP			APCo			I&M		OPCo			PSO		SWEPCo
	(in millions)
Vertically Integrated Utilities Revenues	$	0.1		$	—		$	—	$	—		$	—	$	—
Generation & Marketing Revenues	21.1			—			—		—			—		—
Electric Generation, Transmission and Distribution Revenues	—			(1.0		)	0.9		—			—		—
Sales to AEP Affiliates	—			1.0			1.8		—			—		—
Purchased Electricity for Resale	1.3			0.5			—		—			—		—
Other Operation Expense	(0.2		)	—			—		(0.1		)	—		(0.1		)
Maintenance Expense	(0.4		)	—			—		(0.1		)	—		—
Regulatory Assets (a)	(14.3		)	(12.6		)	1.1		(5.6		)	0.3		2.6
Regulatory Liabilities (a)	17.1			6.4			1.8		—			2.9		6.5
Total Gain (Loss) on Risk Management Contracts	$	24.7		$	(5.7	)	$	5.6	$	(5.8	)	$	3.2	$	9.0

Amount of Gain (Loss) Recognized on

Risk Management Contracts

For the Six Months Ended June 30, 2017

Location of Gain (Loss)	AEP			APCo			I&M			OPCo			PSO		SWEPCo
	(in millions)
Vertically Integrated Utility Revenues	$	6.1		$	—		$	—		$	—		$	—	$	—
Generation & Marketing Revenues	20.8			—			—			—			—		—
Electric Generation, Transmission and Distribution Revenues	—			0.3			5.7			—			—		0.1
Purchased Electricity for Resale	3.9			1.3			0.3			—			—		—
Other Operation Expense	0.4			—			—			—			—		—
Maintenance Expense	0.3			—			—			—			—		—
Regulatory Assets (a)	(18.0		)	(0.1		)	(0.2		)	(17.2		)	—		(0.2		)
Regulatory Liabilities (a)	66.2			24.5			13.2			—			11.1		15.0
Total Gain (Loss) on Risk Management Contracts	$	79.7		$	26.0		$	19.0		$	(17.2	)	$	11.1	$	14.9

Amount of Gain (Loss) Recognized on

Risk Management Contracts

For the Six Months Ended June 30, 2016

Location of Gain (Loss)	AEP			APCo			I&M			OPCo			PSO			SWEPCo
	(in millions)
Vertically Integrated Utilities Revenues	$	0.7		$	—		$	—		$	—		$	—		$	—
Generation & Marketing Revenues	40.9			—			—			—			—			—
Electric Generation, Transmission and Distribution Revenues	—			(1.8		)	2.5			—			—			—
Sales to AEP Affiliates	—			2.1			5.8			—			—			—
Purchased Electricity for Resale	3.4			1.9			0.1			—			—			—
Other Operation Expense	(0.9		)	(0.1		)	(0.1		)	(0.2		)	(0.1		)	(0.2		)
Maintenance Expense	(1.2		)	(0.2		)	(0.1		)	(0.2		)	(0.1		)	(0.1		)
Regulatory Assets (a)	(28.4		)	(12.4		)	1.4			(20.5		)	0.3			2.7
Regulatory Liabilities (a)	29.3			22.3			5.7			(15.2		)	2.4			11.0
Total Gain (Loss) on Risk Management Contracts	$	43.8		$	11.8		$	15.3		$	(36.1	)	$	2.5		$	13.4

(a) Represents realized and unrealized gains and losses subject to regulatory accounting treatment recorded as either current or noncurrent on the balance sheets.

Impact of Cash Flow Hedges on the Condensed Balance Sheet

Impact of Cash Flow Hedges on the Registrant Subsidiaries’ Balance Sheets

	June 30, 2017						December 31, 2016
	Interest Rate
				Expected to be						Expected to be
				Reclassified to						Reclassified to
				Net Income During						Net Income During
	AOCI Gain (Loss)			the Next			AOCI Gain (Loss)			the Next
Company	Net of Tax			Twelve Months			Net of Tax			Twelve Months
	(in millions)
APCo	$	2.5		$	0.7		$	2.9		$	0.7
I&M	(11.3		)	(1.3		)	(12.0		)	(1.3		)
OPCo	2.5			1.1			3.0			1.1
PSO	3.0			0.8			3.4			0.8
SWEPCo	(6.7		)	(1.4		)	(7.4		)	(1.4		)

Collateral Required Under Various Triggering Events

	June 30, 2017					December 31, 2016
	Amount of Collateral		Amount of			Amount of Collateral		Amount of
	That Would		Collateral			That Would		Collateral
	Have Been Required		Attributable to			Have Been Required		Attributable to
	to Post Attributable		Other			to Post Attributable		Other
Company	to RTOs and ISOs		Contracts			to RTOs and ISOs		Contracts
	(in millions)
AEP	$	38.7	$	197.3	(a)	$	9.3	$	280.3	(a)
APCo	7.4		—			1.0		—
I&M	4.5		—			0.6		—
PSO	3.7		3.3			2.1		3.2
SWEPCo	6.2		0.1			2.5		0.1

(a) Represents the amount of collateral AEP subsidiaries would have been required to post for other significant non-derivative contracts including AGR jointly owned plant contracts and various other commodity related contacts.