Fair Value Measurements

3 Months Ended

Mar. 31, 2016

Fair Value Measurements

FAIR VALUE MEASUREMENTS

The disclosures in this note apply to all Registrants unless indicated otherwise.

Fair Value Hierarchy and Valuation Techniques

The accounting guidance for “Fair Value Measurements and Disclosures” establishes a fair value hierarchy that prioritizes the inputs used to measure fair value.  The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurement) and the lowest priority to unobservable inputs (Level 3 measurement).  Where observable inputs are available for substantially the full term of the asset or liability, the instrument is categorized in Level 2.  When quoted market prices are not available, pricing may be completed using comparable securities, dealer values, operating data and general market conditions to determine fair value.  Valuation models utilize various inputs such as commodity, interest rate and, to a lesser degree, volatility and credit that include quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in inactive markets, market corroborated inputs (i.e. inputs derived principally from, or correlated to, observable market data) and other observable inputs for the asset or liability.  The amount of risk taken is determined by the Commercial Operations, Energy Supply and Finance groups in accordance with established risk management policies as approved by the Finance Committee of AEP’s Board of Directors. AEPSC’s market risk oversight staff independently monitors risk policies, procedures and risk levels and provides members of the Commercial Operations Risk Committee (Regulated Risk Committee) and the Energy Supply Risk Committee (Competitive Risk Committee) various reports regarding compliance with policies, limits and procedures. The Regulated Risk Committee consists of AEPSC’s Chief Operating Officer, Chief Financial Officer, Executive Vice President of Generation, Senior Vice President of Commercial Operations and Chief Risk Officer. The Competitive Risk Committee consists of AEPSC’s Chief Operating Officer, Chief Financial Officer and Chief Risk Officer in addition to Energy Supply’s President and Vice President.

For commercial activities, exchange traded derivatives, namely futures contracts, are generally fair valued based on unadjusted quoted prices in active markets and are classified as Level 1.  Level 2 inputs primarily consist of OTC broker quotes in moderately active or less active markets, as well as exchange traded contracts where there is insufficient market liquidity to warrant inclusion in Level 1.  Management verifies price curves using these broker quotes and classifies these fair values within Level 2 when substantially all of the fair value can be corroborated.  Management typically obtains multiple broker quotes, which are nonbinding in nature but are based on recent trades in the marketplace.  When multiple broker quotes are obtained, the quoted bid and ask prices are averaged.  In certain circumstances, a broker quote may be discarded if it is a clear outlier.  Management uses a historical correlation analysis between the broker quoted location and the illiquid locations.  If the points are highly correlated, these locations are included within Level 2 as well.  Certain OTC and bilaterally executed derivative instruments are executed in less active markets with a lower availability of pricing information.  Illiquid transactions, complex structured transactions, FTRs and counterparty credit risk may require nonmarket based inputs.  Some of these inputs may be internally developed or extrapolated and utilized to estimate fair value.  When such inputs have a significant impact on the measurement of fair value, the instrument is categorized as Level 3.  The main driver of contracts being classified as Level 3 is the inability to substantiate energy price curves in the market.  A portion of the Level 3 instruments have been economically hedged which limits potential earnings volatility.

AEP utilizes its trustee’s external pricing service to estimate the fair value of the underlying investments held in the nuclear trusts.  AEP’s investment managers review and validate the prices utilized by the trustee to determine fair value.  AEP’s management performs its own valuation testing to verify the fair values of the securities.  AEP receives audit reports of the trustee’s operating controls and valuation processes.  The trustee uses multiple pricing vendors for the assets held in the trusts.

Assets in the nuclear trusts, Cash and Cash Equivalents, Other Temporary Investments and Restricted Cash for Securitized Funding are classified using the following methods.  Equities are classified as Level 1 holdings if they are actively traded on exchanges.  Items classified as Level 1 are investments in money market funds, fixed income and equity mutual funds and domestic equity securities.  They are valued based on observable inputs, primarily unadjusted quoted prices in active markets for identical assets.  Items classified as Level 2 are primarily investments in individual fixed income securities and cash equivalent funds.  Fixed income securities generally do not trade on exchanges and do not have an official closing price but their valuation inputs are based on observable market data.  Pricing vendors calculate bond valuations using financial models and matrices.  The models use observable inputs including yields on benchmark securities, quotes by securities brokers, rating agency actions, discounts or premiums on securities compared to par prices, changes in yields for U.S. Treasury securities, corporate actions by bond issuers, prepayment schedules and histories, economic events and, for certain securities, adjustments to yields to reflect changes in the rate of inflation.  Other securities with model-derived valuation inputs that are observable are also classified as Level 2 investments.  Investments with unobservable valuation inputs are classified as Level 3 investments.

Fair Value Measurements of Long-term Debt

The fair values of Long-term Debt are based on quoted market prices, without credit enhancements, for the same or similar issues and the current interest rates offered for instruments with similar maturities classified as Level 2 measurement inputs.  These instruments are not marked-to-market.  The estimates presented are not necessarily indicative of the amounts that could be realized in a current market exchange.

The book values and fair values of Long-term Debt for the Registrants as of March 31, 2016 and December 31, 2015 are summarized in the following table:

	March 31, 2016				December 31, 2015
Company	Book Value		Fair Value		Book Value		Fair Value
	(in millions)
AEP	$	19,782.6	$	22,052.8	$	19,572.7	$	21,201.3
APCo	3,919.3		4,597.8		3,930.7		4,416.7
I&M	2,366.6		2,595.4		2,000.0		2,193.6
OPCo	2,135.5		2,515.4		2,157.7		2,472.7
PSO	1,286.3		1,463.6		1,286.1		1,402.9
SWEPCo	2,272.4		2,483.4		2,273.5		2,417.2

Fair Value Measurements of Other Temporary Investments (Applies to AEP)

Other Temporary Investments include funds held by trustees primarily for the payment of securitization bonds and securities available for sale, including marketable securities that management intends to hold for less than one year and investments by its protected cell of EIS.

The following is a summary of Other Temporary Investments:

	March 31, 2016
Other Temporary Investments	Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
	(in millions)
Restricted Cash (a)	$	147.4	$	—	$	—	$	147.4
Fixed Income Securities – Mutual Funds	91.4		0.1		—		91.5
Equity Securities – Mutual Funds	13.9		11.7		—		25.6
Total Other Temporary Investments	$	252.7	$	11.8	$	—	$	264.5

	December 31, 2015
Other Temporary Investments	Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	(in millions)
Restricted Cash (a)	$	271.0	$	—	$	—		$	271.0
Fixed Income Securities – Mutual Funds	91.1		—		(0.7		)	90.4
Equity Securities – Mutual Funds	13.7		11.7		—			25.4
Total Other Temporary Investments	$	375.8	$	11.7	$	(0.7	)	$	386.8

(a) Primarily represents amounts held for the repayment of debt.

The following table provides the activity for fixed income and equity securities within Other Temporary Investments for the three months ended March 31, 2016 and 2015:

	Three Months Ended March 31,
	2016		2015
	(in millions)
Proceeds from Investment Sales	$	—	$	—
Purchases of Investments	0.4		0.4
Gross Realized Gains on Investment Sales	—		—
Gross Realized Losses on Investment Sales	—		—

As of March 31, 2016 and December 31, 2015, AEP had no Other Temporary Investments with an unrealized loss position.  As of March 31, 2016, fixed income securities were primarily debt based mutual funds with short and intermediate maturities.  Mutual funds may be sold and do not contain maturity dates.

For details of the reasons for changes in Securities Available for Sale included in Accumulated Other Comprehensive Income (Loss) for the three months ended March 31, 2016 and 2015, see Note 3.

Fair Value Measurements of Trust Assets for Decommissioning and SNF Disposal (Applies to AEP and I&M)

Nuclear decommissioning and spent nuclear fuel trust funds represent funds that regulatory commissions allow I&M to collect through rates to fund future decommissioning and spent nuclear fuel disposal liabilities.  By rules or orders, the IURC, the MPSC and the FERC established investment limitations and general risk management guidelines.  In general, limitations include:

• Acceptable investments (rated investment grade or above when purchased).

• Maximum percentage invested in a specific type of investment.

• Prohibition of investment in obligations of AEP, I&M or their affiliates.

• Withdrawals permitted only for payment of decommissioning costs and trust expenses.

I&M maintains trust records for each regulatory jurisdiction.  Regulatory approval is required to withdraw decommissioning funds. These funds are managed by external investment managers who must comply with the guidelines and rules of the applicable regulatory authorities.  The trust assets are invested to optimize the net of tax earnings of the trust giving consideration to liquidity, risk, diversification and other prudent investment objectives.

I&M records securities held in these trust funds in Spent Nuclear Fuel and Decommissioning Trusts on its balance sheets. I&M records these securities at fair value.  I&M classifies securities in the trust funds as available-for-sale due to their long-term purpose.  Other-than-temporary impairments for investments in both debt and equity securities are considered realized losses as a result of securities being managed by an external investment management firm.  The external investment management firm makes specific investment decisions regarding the debt and equity investments held in these trusts and generally intends to sell debt securities in an unrealized loss position as part of a tax optimization strategy.  Impairments reduce the cost basis of the securities which will affect any future unrealized gain or realized gain or loss due to the adjusted cost of investment.  I&M records unrealized gains and other-than-temporary impairments from securities in these trust funds as adjustments to the regulatory liability account for the nuclear decommissioning trust funds and to regulatory assets or liabilities for the SNF disposal trust funds in accordance with their treatment in rates.  Consequently, changes in fair value of trust assets do not affect earnings or AOCI.

The following is a summary of nuclear trust fund investments as of March 31, 2016 and December 31, 2015:

	March 31, 2016							December 31, 2015
	Fair Value		Gross Unrealized Gains		Other-Than-Temporary Impairments			Fair Value		Gross Unrealized Gains		Other-Than-Temporary Impairments
	(in millions)
Cash and Cash Equivalents	$	142.0	$	—	$	—		$	168.3	$	—	$	—
Fixed Income Securities:
United States Government	761.1		52.3		(2.1		)	731.1		35.9		(2.6		)
Corporate Debt	68.9		4.9		(1.0		)	57.9		3.2		(1.1		)
State and Local Government	29.0		1.2		(0.3		)	22.2		1.1		(0.3		)
Subtotal Fixed Income Securities	859.0		58.4		(3.4		)	811.2		40.2		(4.0		)
Equity Securities - Domestic	1,151.4		583.5		(78.9		)	1,126.9		571.6		(79.3		)
Spent Nuclear Fuel and Decommissioning Trusts	$	2,152.4	$	641.9	$	(82.3	)	$	2,106.4	$	611.8	$	(83.3	)

The following table provides the securities activity within the decommissioning and SNF trusts for the three months ended March 31, 2016 and 2015:

	Three Months Ended March 31,
	2016		2015
	(in millions)
Proceeds from Investment Sales	$	1,137.7	$	228.2
Purchases of Investments	1,151.6		245.8
Gross Realized Gains on Investment Sales	15.8		11.2
Gross Realized Losses on Investment Sales	7.8		3.8

The adjusted cost of fixed income securities was $801 million and $771 million as of March 31, 2016 and December 31, 2015, respectively.  The adjusted cost of equity securities was $568 million and $555 million as of March 31, 2016 and December 31, 2015, respectively.

The fair value of fixed income securities held in the nuclear trust funds, summarized by contractual maturities, as of March 31, 2016 was as follows:

	Fair Value of Fixed Income Securities
	(in millions)
Within 1 year	$	175.4
1 year – 5 years	369.6
5 years – 10 years	133.0
After 10 years	181.0
Total	$	859.0

Fair Value Measurements of Financial Assets and Liabilities

The following tables set forth, by level within the fair value hierarchy, the Registrants’ financial assets and liabilities that were accounted for at fair value on a recurring basis as of March 31, 2016 and December 31, 2015.  As required by the accounting guidance for “Fair Value Measurements and Disclosures,” financial assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement.  Management’s assessment of the significance of a particular input to the fair value measurement requires judgment and may affect the valuation of fair value assets and liabilities and their placement within the fair value hierarchy levels.  There have not been any significant changes in management’s valuation techniques.

AEP

Assets and Liabilities Measured at Fair Value on a Recurring Basis

March 31, 2016

	Level 1		Level 2		Level 3		Other			Total
Assets:	(in millions)
Cash and Cash Equivalents (a)	$	9.6	$	4.4	$	—	$	176.4		$	190.4
Other Temporary Investments
Restricted Cash (a)	129.2		7.6		—		10.6			147.4
Fixed Income Securities – Mutual Funds	91.5		—		—		—			91.5
Equity Securities – Mutual Funds (b)	25.6		—		—		—			25.6
TotalOther Temporary Investments	246.3		7.6		—		10.6			264.5
Risk Management Assets
Risk Management Commodity Contracts (c) (d)	10.7		585.5		201.8		(346.0		)	452.0
Cash Flow Hedges:
Commodity Hedges (c)	—		11.4		8.1		0.3			19.8
Fair Value Hedges	—		0.5		—		0.4			0.9
Total Risk Management Assets	10.7		597.4		209.9		(345.3		)	472.7
Spent Nuclear Fuel and Decommissioning Trusts
Cash and Cash Equivalents (e)	135.3		—		—		6.7			142.0
Fixed Income Securities:
United States Government	—		761.1		—		—			761.1
Corporate Debt	—		68.9		—		—			68.9
State and Local Government	—		29.0		—		—			29.0
Subtotal Fixed Income Securities	—		859.0		—		—			859.0
Equity Securities – Domestic (b)	1,151.4		—		—		—			1,151.4
TotalSpent Nuclear Fuel and Decommissioning Trusts	1,286.7		859.0		—		6.7			2,152.4
Total Assets	$	1,553.3	$	1,468.4	$	209.9	$	(151.6	)	$	3,080.0
Liabilities:
Risk Management Liabilities
Risk Management Commodity Contracts (c) (d)	$	20.5	$	569.2	$	58.5	$	(377.2	)	$	271.0
Cash Flow Hedges:
Commodity Hedges (c)	—		29.7		10.1		0.3			40.1
Interest Rate/Foreign Currency Hedges	—		0.4		—		—			0.4
Fair Value Hedges	—		—		—		0.4			0.4
Total Risk Management Liabilities	$	20.5	$	599.3	$	68.6	$	(376.5	)	$	311.9

AEP

Assets and Liabilities Measured at Fair Value on a Recurring Basis

December 31, 2015

	Level 1		Level 2		Level 3		Other			Total
Assets:	(in millions)
Cash and Cash Equivalents (a)	$	3.9	$	4.3	$	—	$	168.2		$	176.4
Other Temporary Investments
Restricted Cash (a)	230.0		7.7		—		33.3			271.0
Fixed Income Securities – Mutual Funds	90.4		—		—		—			90.4
Equity Securities – Mutual Funds (b)	25.4		—		—		—			25.4
TotalOther Temporary Investments	345.8		7.7		—		33.3			386.8
Risk Management Assets
Risk Management Commodity Contracts (c) (f)	11.5		495.0		219.7		(287.7		)	438.5
Cash Flow Hedges:
Commodity Hedges (c)	—		15.9		1.0		0.7			17.6
Fair Value Hedges	—		—		—		0.1			0.1
Total Risk Management Assets	11.5		510.9		220.7		(286.9		)	456.2
Spent Nuclear Fuel and Decommissioning Trusts
Cash and Cash Equivalents (e)	160.5		—		—		7.8			168.3
Fixed Income Securities:
United States Government	—		731.1		—		—			731.1
Corporate Debt	—		57.9		—		—			57.9
State and Local Government	—		22.2		—		—			22.2
Subtotal Fixed Income Securities	—		811.2		—		—			811.2
Equity Securities – Domestic (b)	1,126.9		—		—		—			1,126.9
TotalSpent Nuclear Fuel and Decommissioning Trusts	1,287.4		811.2		—		7.8			2,106.4
Total Assets	$	1,648.6	$	1,334.1	$	220.7	$	(77.6	)	$	3,125.8
Liabilities:
Risk Management Liabilities
Risk Management Commodity Contracts (c) (f)	$	24.1	$	471.5	$	67.3	$	(326.3	)	$	236.6
Cash Flow Hedges:
Commodity Hedges (c)	—		18.9		6.5		0.7			26.1
Interest Rate/Foreign Currency Hedges	—		0.4		—		—			0.4
Fair Value Hedges	—		3.0		—		0.1			3.1
Total Risk Management Liabilities	$	24.1	$	493.8	$	73.8	$	(325.5	)	$	266.2

APCo

Assets and Liabilities Measured at Fair Value on a Recurring Basis

March 31, 2016

	Level 1		Level 2		Level 3		Other			Total
Assets:	(in millions)
Restricted Cash for Securitized Funding (a)	$	7.5	$	—	$	—	$	0.1		$	7.6
Risk Management Assets - Nonaffiliated and Affiliated
Risk Management Commodity Contracts (c) (g)	0.2		16.2		8.2		(12.4		)	12.2
Total Assets:	$	7.7	$	16.2	$	8.2	$	(12.3	)	$	19.8
Liabilities:
Risk Management Liabilities - Nonaffiliated
Risk Management Commodity Contracts (c) (g)	$	0.2	$	17.7	$	5.6	$	(13.0	)	$	10.5

APCo

Assets and Liabilities Measured at Fair Value on a Recurring Basis

December 31, 2015

	Level 1		Level 2		Level 3		Other			Total
Assets:	(in millions)
Restricted Cash for Securitized Funding (a)	$	14.8	$	—	$	—	$	0.1		$	14.9
Risk Management Assets - Nonaffiliated and Affiliated
Risk Management Commodity Contracts (c) (g)	0.2		13.9		12.2		(10.6		)	15.7
Total Assets:	$	15.0	$	13.9	$	12.2	$	(10.5	)	$	30.6
Liabilities:
Risk Management Liabilities - Nonaffiliated
Risk Management Commodity Contracts (c) (g)	$	0.2	$	17.8	$	0.5	$	(13.6	)	$	4.9

I&M

Assets and Liabilities Measured at Fair Value on a Recurring Basis

March 31, 2016

	Level 1		Level 2		Level 3		Other			Total
Assets:	(in millions)
Risk Management Assets - Nonaffiliated and Affiliated
Risk Management Commodity Contracts (c) (g)	$	0.1	$	12.5	$	5.5	$	(8.6	)	$	9.5
Spent Nuclear Fuel and Decommissioning Trusts
Cash and Cash Equivalents (e)	135.3		—		—		6.7			142.0
Fixed Income Securities:
United States Government	—		761.1		—		—			761.1
Corporate Debt	—		68.9		—		—			68.9
State and Local Government	—		29.0		—		—			29.0
Subtotal Fixed Income Securities	—		859.0		—		—			859.0
Equity Securities - Domestic (b)	1,151.4		—		—		—			1,151.4
TotalSpent Nuclear Fuel and Decommissioning Trusts	1,286.7		859.0		—		6.7			2,152.4
Total Assets	$	1,286.8	$	871.5	$	5.5	$	(1.9	)	$	2,161.9
Liabilities:
Risk Management Liabilities - Nonaffiliated
Risk Management Commodity Contracts (c) (g)	$	0.1	$	14.2	$	1.8	$	(8.7	)	$	7.4

I&M

Assets and Liabilities Measured at Fair Value on a Recurring Basis

December 31, 2015

	Level 1		Level 2		Level 3		Other			Total
Assets:	(in millions)
Risk Management Assets - Nonaffiliated and Affiliated
Risk Management Commodity Contracts (c) (g)	$	0.1	$	17.0	$	6.3	$	(11.1	)	$	12.3
Spent Nuclear Fuel and Decommissioning Trusts
Cash and Cash Equivalents (e)	160.5		—		—		7.8			168.3
Fixed Income Securities:
United States Government	—		731.1		—		—			731.1
Corporate Debt	—		57.9		—		—			57.9
State and Local Government	—		22.2		—		—			22.2
Subtotal Fixed Income Securities	—		811.2		—		—			811.2
Equity Securities - Domestic (b)	1,126.9		—		—		—			1,126.9
TotalSpent Nuclear Fuel and Decommissioning Trusts	1,287.4		811.2		—		7.8			2,106.4
Total Assets	$	1,287.5	$	828.2	$	6.3	$	(3.3	)	$	2,118.7
Liabilities:
Risk Management Liabilities - Nonaffiliated
Risk Management Commodity Contracts (c) (g)	$	0.1	$	17.5	$	2.0	$	(11.7	)	$	7.9

OPCo

Assets and Liabilities Measured at Fair Value on a Recurring Basis

March 31, 2016

	Level 1		Level 2		Level 3		Other			Total
Assets:	(in millions)
Restricted Cash for Securitized Funding (a)	$	16.2	$	—	$	—	$	—		$	16.2
Liabilities:
Risk Management Liabilities
Risk Management Commodity Contracts (c) (g)	$	—	$	0.6	$	10.9	$	(0.2	)	$	11.3

OPCo

Assets and Liabilities Measured at Fair Value on a Recurring Basis

December 31, 2015

	Level 1		Level 2		Level 3		Other		Total
Assets:	(in millions)
Restricted Cash for Securitized Funding (a)	$	—	$	—	$	—	$	27.7	$	27.7
Risk Management Assets
Risk Management Commodity Contracts (c) (g)	—		—		16.0		3.2		19.2
Total Assets	$	—	$	—	$	16.0	$	30.9	$	46.9
Liabilities:
Risk Management Liabilities
Risk Management Commodity Contracts (c) (g)	$	—	$	0.8	$	0.1	$	2.7	$	3.6

PSO

Assets and Liabilities Measured at Fair Value on a Recurring Basis

March 31, 2016

	Level 1		Level 2		Level 3		Other			Total
Assets:	(in millions)
Risk Management Assets
Risk Management Commodity Contracts (c) (g)	$	—	$	0.1	$	0.7	$	(0.1	)	$	0.7
Liabilities:
Risk Management Liabilities
Risk Management Commodity Contracts (c) (g)	$	—	$	0.3	$	0.1	$	(0.2	)	$	0.2

PSO

Assets and Liabilities Measured at Fair Value on a Recurring Basis

December 31, 2015

	Level 1		Level 2		Level 3		Other			Total
Assets:	(in millions)
Risk Management Assets
Risk Management Commodity Contracts (c) (g)	$	—	$	—	$	0.7	$	(0.1	)	$	0.6
Liabilities:
Risk Management Liabilities
Risk Management Commodity Contracts (c) (g)	$	—	$	0.5	$	0.1	$	(0.4	)	$	0.2

SWEPCo

Assets and Liabilities Measured at Fair Value on a Recurring Basis

March 31, 2016

	Level 1		Level 2		Level 3		Other			Total
Assets:	(in millions)
Cash and Cash Equivalents (a)	$	9.4	$	—	$	—	$	2.9		$	12.3
Risk Management Assets
Risk Management Commodity Contracts (c) (g)	—		0.1		0.8		(0.1		)	0.8
Total Assets	$	9.4	$	0.1	$	0.8	$	2.8		$	13.1
Liabilities:
Risk Management Liabilities
Risk Management Commodity Contracts (c) (g)	$	—	$	5.5	$	0.1	$	(0.3	)	$	5.3

SWEPCo

Assets and Liabilities Measured at Fair Value on a Recurring Basis

December 31, 2015

	Level 1		Level 2		Level 3		Other			Total
Assets:	(in millions)
Cash and Cash Equivalents (a)	$	3.6	$	—	$	—	$	1.6		$	5.2
Risk Management Assets
Risk Management Commodity Contracts (c) (g)	—		—		0.9		(0.1		)	0.8
Total Assets	$	3.6	$	—	$	0.9	$	1.5		$	6.0
Liabilities:
Risk Management Liabilities
Risk Management Commodity Contracts (c) (g)	$	—	$	5.5	$	0.1	$	(0.4	)	$	5.2

(a) Amounts in “Other’’ column primarily represent cash deposits in bank accounts with financial institutions or with third parties.  Level 1 and Level 2 amounts primarily represent investments in money market funds.

(b) Amounts represent publicly traded equity securities and equity-based mutual funds.

(c) Amounts in “Other’’ column primarily represent counterparty netting of risk management and hedging contracts and associated cash collateral under the accounting guidance for “Derivatives and Hedging.’’

(d) The March 31, 2016 maturity of the net fair value of risk management contracts prior to cash collateral, assets/(liabilities), is as follows:  Level 1 matures $(5) million in 2016 and $(5) million in periods 2017-2019;  Level 2 matures $3 million in 2016, $9 million in periods 2017-2019, $3 million in periods 2020-2021 and $1 million in periods 2022-2032;  Level 3 matures $17 million in 2016, $37 million in periods 2017-2019, $21 million in periods 2020-2021 and $69 million in periods 2022-2032.  Risk management commodity contracts are substantially comprised of power contracts.

(e) Amounts in “Other’’ column primarily represent accrued interest receivables from financial institutions.  Level 1 amounts primarily represent investments in money market funds.

(f) The December 31, 2015 maturity of the net fair value of risk management contracts prior to cash collateral, assets/(liabilities), is as follows:  Level 1 matures $(9) million in 2016 and $(4) million in periods 2017-2019;  Level 2 matures $2 million in 2016, $18 million in periods 2017-2019 and $4 million in periods 2020-2021; Level 3 matures $28 million in 2016, $29 million in periods 2017-2019, $19 million in periods 2020-2021 and $76 million in periods 2022-2032.  Risk management commodity contracts are substantially comprised of power contracts.

(g) Substantially comprised of power contracts for APCo, I&M and OPCo and coal contracts for PSO and SWEPCo.

There were no transfers between Level 1 and Level 2 during the three months ended March 31, 2016 and 2015.

The following tables set forth a reconciliation of changes in the fair value of net trading derivatives classified as Level 3 in the fair value hierarchy:

Three Months Ended March 31, 2016	AEP			APCo (a)			I&M (a)			OPCo			PSO			SWEPCo
	(in millions)
Balance as of December 31, 2015	$	146.9		$	11.7		$	4.3		$	15.9		$	0.6		$	0.8
Realized Gain (Loss) Included in Net Income (or Changes in Net Assets) (b) (c)	23.5			15.3			2.5			(0.6		)	(0.8		)	4.6
Unrealized Gain (Loss) Included in Net Income (or Changes in Net Assets) Relating to Assets Still Held at the Reporting Date (b)	21.9			—			—			—			—			—
Realized and Unrealized Gains (Losses) Included in Other Comprehensive Income	1.3			—			—			—			—			—
Purchases, Issuances and Settlements (d)	(42.7		)	(27.7		)	(4.6		)	1.4			0.5			(4.9		)
Transfers out of Level 3 (f) (g)	10.9			0.1			0.1			—			—			—
Changes in Fair Value Allocated to Regulated Jurisdictions (h)	(20.5		)	3.2			1.4			(27.6		)	0.3			0.2
Balance as of March 31, 2016	$	141.3		$	2.6		$	3.7		$	(10.9	)	$	0.6		$	0.7

Three Months Ended March 31, 2015	AEP			APCo			I&M			OPCo			PSO			SWEPCo
	(in millions)
Balance as of December 31, 2014	$	150.8		$	15.8		$	14.7		$	48.4		$	(0.3	)	$	(0.5	)
Realized Gain (Loss) Included in Net Income (or Changes in Net Assets) (b) (c)	8.6			2.2			0.1			0.2			(0.3		)	5.8
Unrealized Gain (Loss) Included in Net Income (or Changes in Net Assets) Relating to Assets Still Held at the Reporting Date (b)	5.2			—			—			—			—			—
Realized and Unrealized Gains (Losses) Included in Other Comprehensive Income	(1.9		)	—			—			—			—			—
Purchases, Issuances and Settlements (d)	(38.5		)	(13.4		)	(9.0		)	(6.8		)	0.6			(5.3		)
Transfers into Level 3 (e) (f)	15.3			—			—			—			—			—
Transfers out of Level 3 (f) (g)	(12.4		)	—			—			—			—			—
Changes in Fair Value Allocated to Regulated Jurisdictions (h)	3.5			1.4			(0.2		)	4.1			(0.7		)	(1.2		)
Balance as of March 31, 2015	$	130.6		$	6.0		$	5.6		$	45.9		$	(0.7	)	$	(1.2	)

(a) Includes both affiliated and nonaffiliated transactions.

(b) Included in revenues on the condensed statements of income.

(c) Represents the change in fair value between the beginning of the reporting period and the settlement of the risk management commodity contract.

(d) Represents the settlement of risk management commodity contracts for the reporting period.

(e) Represents existing assets or liabilities that were previously categorized as Level 2.

(f) Transfers are recognized based on their value at the beginning of the reporting period that the transfer occurred.

(g) Represents existing assets or liabilities that were previously categorized as Level 3.

(h) Relates to the net gains (losses) of those contracts that are not reflected on the condensed statements of income.  These net gains (losses) are recorded as regulatory liabilities/assets.

The following tables quantify the significant unobservable inputs used in developing the fair value of Level 3 positions as of March 31, 2016 and December 31, 2015:

Significant Unobservable Inputs

March 31, 2016

AEP

						Significant	Input/Range
	Fair Value				Valuation	Unobservable						Weighted
	Assets		Liabilities		Technique	Input	Low			High		Average
	(in millions)
Energy Contracts	$	207.6	$	59.5	Discounted Cash Flow	Forward Market Price (a)	$	8.77		$	162.36	$	45.45
						Counterparty Credit Risk (b)	251			669		NA
FTRs	2.3		9.1		Discounted Cash Flow	Forward Market Price (a)	$	(17.72	)	$	10.50	$	0.60
Total	$	209.9	$	68.6

Significant Unobservable Inputs

December 31, 2015

AEP

						Significant	Input/Range
	Fair Value				Valuation	Unobservable						Weighted
	Assets		Liabilities		Technique	Input	Low			High		Average
	(in millions)
Energy Contracts	$	212.3	$	70.3	Discounted Cash Flow	Forward Market Price (a)	$	9.69		$	165.36	$	36.35
						Counterparty Credit Risk (b)	670
FTRs	8.4		3.5		Discounted Cash Flow	Forward Market Price (a)	$	(6.99	)	$	10.34	$	1.10
Total	$	220.7	$	73.8

Significant Unobservable Inputs

March 31, 2016

APCo

						Significant	Forward Price Range
	Fair Value				Valuation	Unobservable					Weighted
	Assets		Liabilities		Technique	Input (a)	Low		High		Average
	(in millions)
Energy Contracts	$	8.2	$	0.1	Discounted Cash Flow	Forward Market Price	$	8.77	$	47.05	$	29.14
FTRs	—		5.5		Discounted Cash Flow	Forward Market Price	0.42		5.58		1.90
Total	$	8.2	$	5.6

Significant Unobservable Inputs

December 31, 2015

APCo

						Significant	Forward Price Range
	Fair Value				Valuation	Unobservable						Weighted
	Assets		Liabilities		Technique	Input (a)	Low			High		Average
	(in millions)
Energy Contracts	$	7.9	$	0.2	Discounted Cash Flow	Forward Market Price	$	12.61		$	47.24	$	32.38
FTRs	4.3		0.3		Discounted Cash Flow	Forward Market Price	(6.96		)	8.43		1.34
Total	$	12.2	$	0.5

Significant Unobservable Inputs

March 31, 2016

I&M

						Significant	Forward Price Range
	Fair Value				Valuation	Unobservable						Weighted
	Assets		Liabilities		Technique	Input (a)	Low			High		Average
	(in millions)
Energy Contracts	$	5.5	$	0.1	Discounted Cash Flow	Forward Market Price	$	8.77		$	47.05	$	29.14
FTRs	—		1.7		Discounted Cash Flow	Forward Market Price	(0.07		)	5.58		0.42
Total	$	5.5	$	1.8

Significant Unobservable Inputs

December 31, 2015

I&M

						Significant	Forward Price Range
	Fair Value				Valuation	Unobservable						Weighted
	Assets		Liabilities		Technique	Input (a)	Low			High		Average
	(in millions)
Energy Contracts	$	6.0	$	0.2	Discounted Cash Flow	Forward Market Price	$	12.61		$	47.24	$	32.38
FTRs	0.3		1.8		Discounted Cash Flow	Forward Market Price	(6.96		)	8.43		1.34
Total	$	6.3	$	2.0

Significant Unobservable Inputs

March 31, 2016

OPCo

						Significant	Forward Price Range
	Fair Value				Valuation	Unobservable					Weighted
	Assets		Liabilities		Technique	Input	Low		High		Average
	(in millions)
Energy Contracts	$	—	$	10.9	Discounted Cash Flow	Forward Market Price (a)	$	36.41	$	162.36	$	84.24
						Counterparty Credit Risk (b)	251
Total	$	—	$	10.9

Significant Unobservable Inputs

December 31, 2015

OPCo

Significant

Forward Price Range

Fair Value

Valuation

Unobservable

Weighted

Assets

Liabilities

Technique

Input (a)

Low

High

Average

(in millions)

Energy Contracts

$

16.0

$

0.1

Discounted Cash Flow

Forward Market Price

$

41.61

$

165.36

$

86.84

Significant Unobservable Inputs

March 31, 2016

PSO

						Significant	Forward Price Range
	Fair Value				Valuation	Unobservable						Weighted
	Assets		Liabilities		Technique	Input (a)	Low			High		Average
	(in millions)
FTRs	$	0.7	$	0.1	Discounted Cash Flow	Forward Market Price	$	(17.72	)	$	1.80	$	(0.59	)

Significant Unobservable Inputs

December 31, 2015

PSO

Significant

Forward Price Range

Fair Value

Valuation

Unobservable

Weighted

Assets

Liabilities

Technique

Input (a)

Low

High

Average

(in millions)

FTRs

$

0.7

$

0.1

Discounted Cash Flow

Forward Market Price

$

(6.96

)

$

8.43

$

1.34

Significant Unobservable Inputs

March 31, 2016

SWEPCo

						Significant	Forward Price Range
	Fair Value				Valuation	Unobservable						Weighted
	Assets		Liabilities		Technique	Input (a)	Low			High		Average
	(in millions)
FTRs	$	0.8	$	0.1	Discounted Cash Flow	Forward Market Price	$	(17.72	)	$	1.80	$	(0.59	)

Significant Unobservable Inputs

December 31, 2015

SWEPCo

Significant

Forward Price Range

Fair Value

Valuation

Unobservable

Weighted

Assets

Liabilities

Technique

Input (a)

Low

High

Average

(in millions)

FTRs

$

0.9

$

0.1

Discounted Cash Flow

Forward Market Price

$

(6.96

)

$

8.43

$

1.34

(a) Represents market prices in dollars per MWh.

(b) Represents average price of credit default swaps used to calculate counterparty credit risk, reported in basis points.

NA    Not applicable.

The following table provides sensitivity of fair value measurements to increases (decreases) in significant unobservable inputs related to Energy Contracts and FTRs for the Registrants as of March 31, 2016 and December 31, 2015:

Sensitivity of Fair Value Measurements

Significant Unobservable Input	Position	Change in Input	Impact on Fair Value Measurement
Forward Market Price	Buy	Increase (Decrease)	Higher (Lower)
Forward Market Price	Sell	Increase (Decrease)	Lower (Higher)
Counterparty Credit Risk	Loss	Increase (Decrease)	Higher (Lower)
Counterparty Credit Risk	Gain	Increase (Decrease)	Lower (Higher)

Appalachian Power Co [Member]

Fair Value Measurements

FAIR VALUE MEASUREMENTS

The disclosures in this note apply to all Registrants unless indicated otherwise.

Fair Value Hierarchy and Valuation Techniques

The accounting guidance for “Fair Value Measurements and Disclosures” establishes a fair value hierarchy that prioritizes the inputs used to measure fair value.  The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurement) and the lowest priority to unobservable inputs (Level 3 measurement).  Where observable inputs are available for substantially the full term of the asset or liability, the instrument is categorized in Level 2.  When quoted market prices are not available, pricing may be completed using comparable securities, dealer values, operating data and general market conditions to determine fair value.  Valuation models utilize various inputs such as commodity, interest rate and, to a lesser degree, volatility and credit that include quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in inactive markets, market corroborated inputs (i.e. inputs derived principally from, or correlated to, observable market data) and other observable inputs for the asset or liability.  The amount of risk taken is determined by the Commercial Operations, Energy Supply and Finance groups in accordance with established risk management policies as approved by the Finance Committee of AEP’s Board of Directors. AEPSC’s market risk oversight staff independently monitors risk policies, procedures and risk levels and provides members of the Commercial Operations Risk Committee (Regulated Risk Committee) and the Energy Supply Risk Committee (Competitive Risk Committee) various reports regarding compliance with policies, limits and procedures. The Regulated Risk Committee consists of AEPSC’s Chief Operating Officer, Chief Financial Officer, Executive Vice President of Generation, Senior Vice President of Commercial Operations and Chief Risk Officer. The Competitive Risk Committee consists of AEPSC’s Chief Operating Officer, Chief Financial Officer and Chief Risk Officer in addition to Energy Supply’s President and Vice President.

For commercial activities, exchange traded derivatives, namely futures contracts, are generally fair valued based on unadjusted quoted prices in active markets and are classified as Level 1.  Level 2 inputs primarily consist of OTC broker quotes in moderately active or less active markets, as well as exchange traded contracts where there is insufficient market liquidity to warrant inclusion in Level 1.  Management verifies price curves using these broker quotes and classifies these fair values within Level 2 when substantially all of the fair value can be corroborated.  Management typically obtains multiple broker quotes, which are nonbinding in nature but are based on recent trades in the marketplace.  When multiple broker quotes are obtained, the quoted bid and ask prices are averaged.  In certain circumstances, a broker quote may be discarded if it is a clear outlier.  Management uses a historical correlation analysis between the broker quoted location and the illiquid locations.  If the points are highly correlated, these locations are included within Level 2 as well.  Certain OTC and bilaterally executed derivative instruments are executed in less active markets with a lower availability of pricing information.  Illiquid transactions, complex structured transactions, FTRs and counterparty credit risk may require nonmarket based inputs.  Some of these inputs may be internally developed or extrapolated and utilized to estimate fair value.  When such inputs have a significant impact on the measurement of fair value, the instrument is categorized as Level 3.  The main driver of contracts being classified as Level 3 is the inability to substantiate energy price curves in the market.  A portion of the Level 3 instruments have been economically hedged which limits potential earnings volatility.

AEP utilizes its trustee’s external pricing service to estimate the fair value of the underlying investments held in the nuclear trusts.  AEP’s investment managers review and validate the prices utilized by the trustee to determine fair value.  AEP’s management performs its own valuation testing to verify the fair values of the securities.  AEP receives audit reports of the trustee’s operating controls and valuation processes.  The trustee uses multiple pricing vendors for the assets held in the trusts.

Assets in the nuclear trusts, Cash and Cash Equivalents, Other Temporary Investments and Restricted Cash for Securitized Funding are classified using the following methods.  Equities are classified as Level 1 holdings if they are actively traded on exchanges.  Items classified as Level 1 are investments in money market funds, fixed income and equity mutual funds and domestic equity securities.  They are valued based on observable inputs, primarily unadjusted quoted prices in active markets for identical assets.  Items classified as Level 2 are primarily investments in individual fixed income securities and cash equivalent funds.  Fixed income securities generally do not trade on exchanges and do not have an official closing price but their valuation inputs are based on observable market data.  Pricing vendors calculate bond valuations using financial models and matrices.  The models use observable inputs including yields on benchmark securities, quotes by securities brokers, rating agency actions, discounts or premiums on securities compared to par prices, changes in yields for U.S. Treasury securities, corporate actions by bond issuers, prepayment schedules and histories, economic events and, for certain securities, adjustments to yields to reflect changes in the rate of inflation.  Other securities with model-derived valuation inputs that are observable are also classified as Level 2 investments.  Investments with unobservable valuation inputs are classified as Level 3 investments.

Fair Value Measurements of Long-term Debt

The fair values of Long-term Debt are based on quoted market prices, without credit enhancements, for the same or similar issues and the current interest rates offered for instruments with similar maturities classified as Level 2 measurement inputs.  These instruments are not marked-to-market.  The estimates presented are not necessarily indicative of the amounts that could be realized in a current market exchange.

The book values and fair values of Long-term Debt for the Registrants as of March 31, 2016 and December 31, 2015 are summarized in the following table:

	March 31, 2016				December 31, 2015
Company	Book Value		Fair Value		Book Value		Fair Value
	(in millions)
AEP	$	19,782.6	$	22,052.8	$	19,572.7	$	21,201.3
APCo	3,919.3		4,597.8		3,930.7		4,416.7
I&M	2,366.6		2,595.4		2,000.0		2,193.6
OPCo	2,135.5		2,515.4		2,157.7		2,472.7
PSO	1,286.3		1,463.6		1,286.1		1,402.9
SWEPCo	2,272.4		2,483.4		2,273.5		2,417.2

Fair Value Measurements of Other Temporary Investments (Applies to AEP)

Other Temporary Investments include funds held by trustees primarily for the payment of securitization bonds and securities available for sale, including marketable securities that management intends to hold for less than one year and investments by its protected cell of EIS.

The following is a summary of Other Temporary Investments:

	March 31, 2016
Other Temporary Investments	Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
	(in millions)
Restricted Cash (a)	$	147.4	$	—	$	—	$	147.4
Fixed Income Securities – Mutual Funds	91.4		0.1		—		91.5
Equity Securities – Mutual Funds	13.9		11.7		—		25.6
Total Other Temporary Investments	$	252.7	$	11.8	$	—	$	264.5

	December 31, 2015
Other Temporary Investments	Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	(in millions)
Restricted Cash (a)	$	271.0	$	—	$	—		$	271.0
Fixed Income Securities – Mutual Funds	91.1		—		(0.7		)	90.4
Equity Securities – Mutual Funds	13.7		11.7		—			25.4
Total Other Temporary Investments	$	375.8	$	11.7	$	(0.7	)	$	386.8

(a) Primarily represents amounts held for the repayment of debt.

The following table provides the activity for fixed income and equity securities within Other Temporary Investments for the three months ended March 31, 2016 and 2015:

	Three Months Ended March 31,
	2016		2015
	(in millions)
Proceeds from Investment Sales	$	—	$	—
Purchases of Investments	0.4		0.4
Gross Realized Gains on Investment Sales	—		—
Gross Realized Losses on Investment Sales	—		—

As of March 31, 2016 and December 31, 2015, AEP had no Other Temporary Investments with an unrealized loss position.  As of March 31, 2016, fixed income securities were primarily debt based mutual funds with short and intermediate maturities.  Mutual funds may be sold and do not contain maturity dates.

For details of the reasons for changes in Securities Available for Sale included in Accumulated Other Comprehensive Income (Loss) for the three months ended March 31, 2016 and 2015, see Note 3.

Fair Value Measurements of Trust Assets for Decommissioning and SNF Disposal (Applies to AEP and I&M)

Nuclear decommissioning and spent nuclear fuel trust funds represent funds that regulatory commissions allow I&M to collect through rates to fund future decommissioning and spent nuclear fuel disposal liabilities.  By rules or orders, the IURC, the MPSC and the FERC established investment limitations and general risk management guidelines.  In general, limitations include:

• Acceptable investments (rated investment grade or above when purchased).

• Maximum percentage invested in a specific type of investment.

• Prohibition of investment in obligations of AEP, I&M or their affiliates.

• Withdrawals permitted only for payment of decommissioning costs and trust expenses.

I&M maintains trust records for each regulatory jurisdiction.  Regulatory approval is required to withdraw decommissioning funds. These funds are managed by external investment managers who must comply with the guidelines and rules of the applicable regulatory authorities.  The trust assets are invested to optimize the net of tax earnings of the trust giving consideration to liquidity, risk, diversification and other prudent investment objectives.

I&M records securities held in these trust funds in Spent Nuclear Fuel and Decommissioning Trusts on its balance sheets. I&M records these securities at fair value.  I&M classifies securities in the trust funds as available-for-sale due to their long-term purpose.  Other-than-temporary impairments for investments in both debt and equity securities are considered realized losses as a result of securities being managed by an external investment management firm.  The external investment management firm makes specific investment decisions regarding the debt and equity investments held in these trusts and generally intends to sell debt securities in an unrealized loss position as part of a tax optimization strategy.  Impairments reduce the cost basis of the securities which will affect any future unrealized gain or realized gain or loss due to the adjusted cost of investment.  I&M records unrealized gains and other-than-temporary impairments from securities in these trust funds as adjustments to the regulatory liability account for the nuclear decommissioning trust funds and to regulatory assets or liabilities for the SNF disposal trust funds in accordance with their treatment in rates.  Consequently, changes in fair value of trust assets do not affect earnings or AOCI.

The following is a summary of nuclear trust fund investments as of March 31, 2016 and December 31, 2015:

	March 31, 2016							December 31, 2015
	Fair Value		Gross Unrealized Gains		Other-Than-Temporary Impairments			Fair Value		Gross Unrealized Gains		Other-Than-Temporary Impairments
	(in millions)
Cash and Cash Equivalents	$	142.0	$	—	$	—		$	168.3	$	—	$	—
Fixed Income Securities:
United States Government	761.1		52.3		(2.1		)	731.1		35.9		(2.6		)
Corporate Debt	68.9		4.9		(1.0		)	57.9		3.2		(1.1		)
State and Local Government	29.0		1.2		(0.3		)	22.2		1.1		(0.3		)
Subtotal Fixed Income Securities	859.0		58.4		(3.4		)	811.2		40.2		(4.0		)
Equity Securities - Domestic	1,151.4		583.5		(78.9		)	1,126.9		571.6		(79.3		)
Spent Nuclear Fuel and Decommissioning Trusts	$	2,152.4	$	641.9	$	(82.3	)	$	2,106.4	$	611.8	$	(83.3	)

The following table provides the securities activity within the decommissioning and SNF trusts for the three months ended March 31, 2016 and 2015:

	Three Months Ended March 31,
	2016		2015
	(in millions)
Proceeds from Investment Sales	$	1,137.7	$	228.2
Purchases of Investments	1,151.6		245.8
Gross Realized Gains on Investment Sales	15.8		11.2
Gross Realized Losses on Investment Sales	7.8		3.8

The adjusted cost of fixed income securities was $801 million and $771 million as of March 31, 2016 and December 31, 2015, respectively.  The adjusted cost of equity securities was $568 million and $555 million as of March 31, 2016 and December 31, 2015, respectively.

The fair value of fixed income securities held in the nuclear trust funds, summarized by contractual maturities, as of March 31, 2016 was as follows:

	Fair Value of Fixed Income Securities
	(in millions)
Within 1 year	$	175.4
1 year – 5 years	369.6
5 years – 10 years	133.0
After 10 years	181.0
Total	$	859.0

Fair Value Measurements of Financial Assets and Liabilities

The following tables set forth, by level within the fair value hierarchy, the Registrants’ financial assets and liabilities that were accounted for at fair value on a recurring basis as of March 31, 2016 and December 31, 2015.  As required by the accounting guidance for “Fair Value Measurements and Disclosures,” financial assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement.  Management’s assessment of the significance of a particular input to the fair value measurement requires judgment and may affect the valuation of fair value assets and liabilities and their placement within the fair value hierarchy levels.  There have not been any significant changes in management’s valuation techniques.

AEP

Assets and Liabilities Measured at Fair Value on a Recurring Basis

March 31, 2016

	Level 1		Level 2		Level 3		Other			Total
Assets:	(in millions)
Cash and Cash Equivalents (a)	$	9.6	$	4.4	$	—	$	176.4		$	190.4
Other Temporary Investments
Restricted Cash (a)	129.2		7.6		—		10.6			147.4
Fixed Income Securities – Mutual Funds	91.5		—		—		—			91.5
Equity Securities – Mutual Funds (b)	25.6		—		—		—			25.6
TotalOther Temporary Investments	246.3		7.6		—		10.6			264.5
Risk Management Assets
Risk Management Commodity Contracts (c) (d)	10.7		585.5		201.8		(346.0		)	452.0
Cash Flow Hedges:
Commodity Hedges (c)	—		11.4		8.1		0.3			19.8
Fair Value Hedges	—		0.5		—		0.4			0.9
Total Risk Management Assets	10.7		597.4		209.9		(345.3		)	472.7
Spent Nuclear Fuel and Decommissioning Trusts
Cash and Cash Equivalents (e)	135.3		—		—		6.7			142.0
Fixed Income Securities:
United States Government	—		761.1		—		—			761.1
Corporate Debt	—		68.9		—		—			68.9
State and Local Government	—		29.0		—		—			29.0
Subtotal Fixed Income Securities	—		859.0		—		—			859.0
Equity Securities – Domestic (b)	1,151.4		—		—		—			1,151.4
TotalSpent Nuclear Fuel and Decommissioning Trusts	1,286.7		859.0		—		6.7			2,152.4
Total Assets	$	1,553.3	$	1,468.4	$	209.9	$	(151.6	)	$	3,080.0
Liabilities:
Risk Management Liabilities
Risk Management Commodity Contracts (c) (d)	$	20.5	$	569.2	$	58.5	$	(377.2	)	$	271.0
Cash Flow Hedges:
Commodity Hedges (c)	—		29.7		10.1		0.3			40.1
Interest Rate/Foreign Currency Hedges	—		0.4		—		—			0.4
Fair Value Hedges	—		—		—		0.4			0.4
Total Risk Management Liabilities	$	20.5	$	599.3	$	68.6	$	(376.5	)	$	311.9

AEP

Assets and Liabilities Measured at Fair Value on a Recurring Basis

December 31, 2015

	Level 1		Level 2		Level 3		Other			Total
Assets:	(in millions)
Cash and Cash Equivalents (a)	$	3.9	$	4.3	$	—	$	168.2		$	176.4
Other Temporary Investments
Restricted Cash (a)	230.0		7.7		—		33.3			271.0
Fixed Income Securities – Mutual Funds	90.4		—		—		—			90.4
Equity Securities – Mutual Funds (b)	25.4		—		—		—			25.4
TotalOther Temporary Investments	345.8		7.7		—		33.3			386.8
Risk Management Assets
Risk Management Commodity Contracts (c) (f)	11.5		495.0		219.7		(287.7		)	438.5
Cash Flow Hedges:
Commodity Hedges (c)	—		15.9		1.0		0.7			17.6
Fair Value Hedges	—		—		—		0.1			0.1
Total Risk Management Assets	11.5		510.9		220.7		(286.9		)	456.2
Spent Nuclear Fuel and Decommissioning Trusts
Cash and Cash Equivalents (e)	160.5		—		—		7.8			168.3
Fixed Income Securities:
United States Government	—		731.1		—		—			731.1
Corporate Debt	—		57.9		—		—			57.9
State and Local Government	—		22.2		—		—			22.2
Subtotal Fixed Income Securities	—		811.2		—		—			811.2
Equity Securities – Domestic (b)	1,126.9		—		—		—			1,126.9
TotalSpent Nuclear Fuel and Decommissioning Trusts	1,287.4		811.2		—		7.8			2,106.4
Total Assets	$	1,648.6	$	1,334.1	$	220.7	$	(77.6	)	$	3,125.8
Liabilities:
Risk Management Liabilities
Risk Management Commodity Contracts (c) (f)	$	24.1	$	471.5	$	67.3	$	(326.3	)	$	236.6
Cash Flow Hedges:
Commodity Hedges (c)	—		18.9		6.5		0.7			26.1
Interest Rate/Foreign Currency Hedges	—		0.4		—		—			0.4
Fair Value Hedges	—		3.0		—		0.1			3.1
Total Risk Management Liabilities	$	24.1	$	493.8	$	73.8	$	(325.5	)	$	266.2

APCo

Assets and Liabilities Measured at Fair Value on a Recurring Basis

March 31, 2016

	Level 1		Level 2		Level 3		Other			Total
Assets:	(in millions)
Restricted Cash for Securitized Funding (a)	$	7.5	$	—	$	—	$	0.1		$	7.6
Risk Management Assets - Nonaffiliated and Affiliated
Risk Management Commodity Contracts (c) (g)	0.2		16.2		8.2		(12.4		)	12.2
Total Assets:	$	7.7	$	16.2	$	8.2	$	(12.3	)	$	19.8
Liabilities:
Risk Management Liabilities - Nonaffiliated
Risk Management Commodity Contracts (c) (g)	$	0.2	$	17.7	$	5.6	$	(13.0	)	$	10.5

APCo

Assets and Liabilities Measured at Fair Value on a Recurring Basis

December 31, 2015

	Level 1		Level 2		Level 3		Other			Total
Assets:	(in millions)
Restricted Cash for Securitized Funding (a)	$	14.8	$	—	$	—	$	0.1		$	14.9
Risk Management Assets - Nonaffiliated and Affiliated
Risk Management Commodity Contracts (c) (g)	0.2		13.9		12.2		(10.6		)	15.7
Total Assets:	$	15.0	$	13.9	$	12.2	$	(10.5	)	$	30.6
Liabilities:
Risk Management Liabilities - Nonaffiliated
Risk Management Commodity Contracts (c) (g)	$	0.2	$	17.8	$	0.5	$	(13.6	)	$	4.9

I&M

Assets and Liabilities Measured at Fair Value on a Recurring Basis

March 31, 2016

	Level 1		Level 2		Level 3		Other			Total
Assets:	(in millions)
Risk Management Assets - Nonaffiliated and Affiliated
Risk Management Commodity Contracts (c) (g)	$	0.1	$	12.5	$	5.5	$	(8.6	)	$	9.5
Spent Nuclear Fuel and Decommissioning Trusts
Cash and Cash Equivalents (e)	135.3		—		—		6.7			142.0
Fixed Income Securities:
United States Government	—		761.1		—		—			761.1
Corporate Debt	—		68.9		—		—			68.9
State and Local Government	—		29.0		—		—			29.0
Subtotal Fixed Income Securities	—		859.0		—		—			859.0
Equity Securities - Domestic (b)	1,151.4		—		—		—			1,151.4
TotalSpent Nuclear Fuel and Decommissioning Trusts	1,286.7		859.0		—		6.7			2,152.4
Total Assets	$	1,286.8	$	871.5	$	5.5	$	(1.9	)	$	2,161.9
Liabilities:
Risk Management Liabilities - Nonaffiliated
Risk Management Commodity Contracts (c) (g)	$	0.1	$	14.2	$	1.8	$	(8.7	)	$	7.4

I&M

Assets and Liabilities Measured at Fair Value on a Recurring Basis

December 31, 2015

	Level 1		Level 2		Level 3		Other			Total
Assets:	(in millions)
Risk Management Assets - Nonaffiliated and Affiliated
Risk Management Commodity Contracts (c) (g)	$	0.1	$	17.0	$	6.3	$	(11.1	)	$	12.3
Spent Nuclear Fuel and Decommissioning Trusts
Cash and Cash Equivalents (e)	160.5		—		—		7.8			168.3
Fixed Income Securities:
United States Government	—		731.1		—		—			731.1
Corporate Debt	—		57.9		—		—			57.9
State and Local Government	—		22.2		—		—			22.2
Subtotal Fixed Income Securities	—		811.2		—		—			811.2
Equity Securities - Domestic (b)	1,126.9		—		—		—			1,126.9
TotalSpent Nuclear Fuel and Decommissioning Trusts	1,287.4		811.2		—		7.8			2,106.4
Total Assets	$	1,287.5	$	828.2	$	6.3	$	(3.3	)	$	2,118.7
Liabilities:
Risk Management Liabilities - Nonaffiliated
Risk Management Commodity Contracts (c) (g)	$	0.1	$	17.5	$	2.0	$	(11.7	)	$	7.9

OPCo

Assets and Liabilities Measured at Fair Value on a Recurring Basis

March 31, 2016

	Level 1		Level 2		Level 3		Other			Total
Assets:	(in millions)
Restricted Cash for Securitized Funding (a)	$	16.2	$	—	$	—	$	—		$	16.2
Liabilities:
Risk Management Liabilities
Risk Management Commodity Contracts (c) (g)	$	—	$	0.6	$	10.9	$	(0.2	)	$	11.3

OPCo

Assets and Liabilities Measured at Fair Value on a Recurring Basis

December 31, 2015

	Level 1		Level 2		Level 3		Other		Total
Assets:	(in millions)
Restricted Cash for Securitized Funding (a)	$	—	$	—	$	—	$	27.7	$	27.7
Risk Management Assets
Risk Management Commodity Contracts (c) (g)	—		—		16.0		3.2		19.2
Total Assets	$	—	$	—	$	16.0	$	30.9	$	46.9
Liabilities:
Risk Management Liabilities
Risk Management Commodity Contracts (c) (g)	$	—	$	0.8	$	0.1	$	2.7	$	3.6

PSO

Assets and Liabilities Measured at Fair Value on a Recurring Basis

March 31, 2016

	Level 1		Level 2		Level 3		Other			Total
Assets:	(in millions)
Risk Management Assets
Risk Management Commodity Contracts (c) (g)	$	—	$	0.1	$	0.7	$	(0.1	)	$	0.7
Liabilities:
Risk Management Liabilities
Risk Management Commodity Contracts (c) (g)	$	—	$	0.3	$	0.1	$	(0.2	)	$	0.2

PSO

Assets and Liabilities Measured at Fair Value on a Recurring Basis

December 31, 2015

	Level 1		Level 2		Level 3		Other			Total
Assets:	(in millions)
Risk Management Assets
Risk Management Commodity Contracts (c) (g)	$	—	$	—	$	0.7	$	(0.1	)	$	0.6
Liabilities:
Risk Management Liabilities
Risk Management Commodity Contracts (c) (g)	$	—	$	0.5	$	0.1	$	(0.4	)	$	0.2

SWEPCo

Assets and Liabilities Measured at Fair Value on a Recurring Basis

March 31, 2016

	Level 1		Level 2		Level 3		Other			Total
Assets:	(in millions)
Cash and Cash Equivalents (a)	$	9.4	$	—	$	—	$	2.9		$	12.3
Risk Management Assets
Risk Management Commodity Contracts (c) (g)	—		0.1		0.8		(0.1		)	0.8
Total Assets	$	9.4	$	0.1	$	0.8	$	2.8		$	13.1
Liabilities:
Risk Management Liabilities
Risk Management Commodity Contracts (c) (g)	$	—	$	5.5	$	0.1	$	(0.3	)	$	5.3

SWEPCo

Assets and Liabilities Measured at Fair Value on a Recurring Basis

December 31, 2015

	Level 1		Level 2		Level 3		Other			Total
Assets:	(in millions)
Cash and Cash Equivalents (a)	$	3.6	$	—	$	—	$	1.6		$	5.2
Risk Management Assets
Risk Management Commodity Contracts (c) (g)	—		—		0.9		(0.1		)	0.8
Total Assets	$	3.6	$	—	$	0.9	$	1.5		$	6.0
Liabilities:
Risk Management Liabilities
Risk Management Commodity Contracts (c) (g)	$	—	$	5.5	$	0.1	$	(0.4	)	$	5.2

(a) Amounts in “Other’’ column primarily represent cash deposits in bank accounts with financial institutions or with third parties.  Level 1 and Level 2 amounts primarily represent investments in money market funds.

(b) Amounts represent publicly traded equity securities and equity-based mutual funds.

(c) Amounts in “Other’’ column primarily represent counterparty netting of risk management and hedging contracts and associated cash collateral under the accounting guidance for “Derivatives and Hedging.’’

(d) The March 31, 2016 maturity of the net fair value of risk management contracts prior to cash collateral, assets/(liabilities), is as follows:  Level 1 matures $(5) million in 2016 and $(5) million in periods 2017-2019;  Level 2 matures $3 million in 2016, $9 million in periods 2017-2019, $3 million in periods 2020-2021 and $1 million in periods 2022-2032;  Level 3 matures $17 million in 2016, $37 million in periods 2017-2019, $21 million in periods 2020-2021 and $69 million in periods 2022-2032.  Risk management commodity contracts are substantially comprised of power contracts.

(e) Amounts in “Other’’ column primarily represent accrued interest receivables from financial institutions.  Level 1 amounts primarily represent investments in money market funds.

(f) The December 31, 2015 maturity of the net fair value of risk management contracts prior to cash collateral, assets/(liabilities), is as follows:  Level 1 matures $(9) million in 2016 and $(4) million in periods 2017-2019;  Level 2 matures $2 million in 2016, $18 million in periods 2017-2019 and $4 million in periods 2020-2021; Level 3 matures $28 million in 2016, $29 million in periods 2017-2019, $19 million in periods 2020-2021 and $76 million in periods 2022-2032.  Risk management commodity contracts are substantially comprised of power contracts.

(g) Substantially comprised of power contracts for APCo, I&M and OPCo and coal contracts for PSO and SWEPCo.

There were no transfers between Level 1 and Level 2 during the three months ended March 31, 2016 and 2015.

The following tables set forth a reconciliation of changes in the fair value of net trading derivatives classified as Level 3 in the fair value hierarchy:

Three Months Ended March 31, 2016	AEP			APCo (a)			I&M (a)			OPCo			PSO			SWEPCo
	(in millions)
Balance as of December 31, 2015	$	146.9		$	11.7		$	4.3		$	15.9		$	0.6		$	0.8
Realized Gain (Loss) Included in Net Income (or Changes in Net Assets) (b) (c)	23.5			15.3			2.5			(0.6		)	(0.8		)	4.6
Unrealized Gain (Loss) Included in Net Income (or Changes in Net Assets) Relating to Assets Still Held at the Reporting Date (b)	21.9			—			—			—			—			—
Realized and Unrealized Gains (Losses) Included in Other Comprehensive Income	1.3			—			—			—			—			—
Purchases, Issuances and Settlements (d)	(42.7		)	(27.7		)	(4.6		)	1.4			0.5			(4.9		)
Transfers out of Level 3 (f) (g)	10.9			0.1			0.1			—			—			—
Changes in Fair Value Allocated to Regulated Jurisdictions (h)	(20.5		)	3.2			1.4			(27.6		)	0.3			0.2
Balance as of March 31, 2016	$	141.3		$	2.6		$	3.7		$	(10.9	)	$	0.6		$	0.7

Three Months Ended March 31, 2015	AEP			APCo			I&M			OPCo			PSO			SWEPCo
	(in millions)
Balance as of December 31, 2014	$	150.8		$	15.8		$	14.7		$	48.4		$	(0.3	)	$	(0.5	)
Realized Gain (Loss) Included in Net Income (or Changes in Net Assets) (b) (c)	8.6			2.2			0.1			0.2			(0.3		)	5.8
Unrealized Gain (Loss) Included in Net Income (or Changes in Net Assets) Relating to Assets Still Held at the Reporting Date (b)	5.2			—			—			—			—			—
Realized and Unrealized Gains (Losses) Included in Other Comprehensive Income	(1.9		)	—			—			—			—			—
Purchases, Issuances and Settlements (d)	(38.5		)	(13.4		)	(9.0		)	(6.8		)	0.6			(5.3		)
Transfers into Level 3 (e) (f)	15.3			—			—			—			—			—
Transfers out of Level 3 (f) (g)	(12.4		)	—			—			—			—			—
Changes in Fair Value Allocated to Regulated Jurisdictions (h)	3.5			1.4			(0.2		)	4.1			(0.7		)	(1.2		)
Balance as of March 31, 2015	$	130.6		$	6.0		$	5.6		$	45.9		$	(0.7	)	$	(1.2	)

(a) Includes both affiliated and nonaffiliated transactions.

(b) Included in revenues on the condensed statements of income.

(c) Represents the change in fair value between the beginning of the reporting period and the settlement of the risk management commodity contract.

(d) Represents the settlement of risk management commodity contracts for the reporting period.

(e) Represents existing assets or liabilities that were previously categorized as Level 2.

(f) Transfers are recognized based on their value at the beginning of the reporting period that the transfer occurred.

(g) Represents existing assets or liabilities that were previously categorized as Level 3.

(h) Relates to the net gains (losses) of those contracts that are not reflected on the condensed statements of income.  These net gains (losses) are recorded as regulatory liabilities/assets.

The following tables quantify the significant unobservable inputs used in developing the fair value of Level 3 positions as of March 31, 2016 and December 31, 2015:

Significant Unobservable Inputs

March 31, 2016

AEP

						Significant	Input/Range
	Fair Value				Valuation	Unobservable						Weighted
	Assets		Liabilities		Technique	Input	Low			High		Average
	(in millions)
Energy Contracts	$	207.6	$	59.5	Discounted Cash Flow	Forward Market Price (a)	$	8.77		$	162.36	$	45.45
						Counterparty Credit Risk (b)	251			669		NA
FTRs	2.3		9.1		Discounted Cash Flow	Forward Market Price (a)	$	(17.72	)	$	10.50	$	0.60
Total	$	209.9	$	68.6

Significant Unobservable Inputs

December 31, 2015

AEP

						Significant	Input/Range
	Fair Value				Valuation	Unobservable						Weighted
	Assets		Liabilities		Technique	Input	Low			High		Average
	(in millions)
Energy Contracts	$	212.3	$	70.3	Discounted Cash Flow	Forward Market Price (a)	$	9.69		$	165.36	$	36.35
						Counterparty Credit Risk (b)	670
FTRs	8.4		3.5		Discounted Cash Flow	Forward Market Price (a)	$	(6.99	)	$	10.34	$	1.10
Total	$	220.7	$	73.8

Significant Unobservable Inputs

March 31, 2016

APCo

						Significant	Forward Price Range
	Fair Value				Valuation	Unobservable					Weighted
	Assets		Liabilities		Technique	Input (a)	Low		High		Average
	(in millions)
Energy Contracts	$	8.2	$	0.1	Discounted Cash Flow	Forward Market Price	$	8.77	$	47.05	$	29.14
FTRs	—		5.5		Discounted Cash Flow	Forward Market Price	0.42		5.58		1.90
Total	$	8.2	$	5.6

Significant Unobservable Inputs

December 31, 2015

APCo

						Significant	Forward Price Range
	Fair Value				Valuation	Unobservable						Weighted
	Assets		Liabilities		Technique	Input (a)	Low			High		Average
	(in millions)
Energy Contracts	$	7.9	$	0.2	Discounted Cash Flow	Forward Market Price	$	12.61		$	47.24	$	32.38
FTRs	4.3		0.3		Discounted Cash Flow	Forward Market Price	(6.96		)	8.43		1.34
Total	$	12.2	$	0.5

Significant Unobservable Inputs

March 31, 2016

I&M

						Significant	Forward Price Range
	Fair Value				Valuation	Unobservable						Weighted
	Assets		Liabilities		Technique	Input (a)	Low			High		Average
	(in millions)
Energy Contracts	$	5.5	$	0.1	Discounted Cash Flow	Forward Market Price	$	8.77		$	47.05	$	29.14
FTRs	—		1.7		Discounted Cash Flow	Forward Market Price	(0.07		)	5.58		0.42
Total	$	5.5	$	1.8

Significant Unobservable Inputs

December 31, 2015

I&M

						Significant	Forward Price Range
	Fair Value				Valuation	Unobservable						Weighted
	Assets		Liabilities		Technique	Input (a)	Low			High		Average
	(in millions)
Energy Contracts	$	6.0	$	0.2	Discounted Cash Flow	Forward Market Price	$	12.61		$	47.24	$	32.38
FTRs	0.3		1.8		Discounted Cash Flow	Forward Market Price	(6.96		)	8.43		1.34
Total	$	6.3	$	2.0

Significant Unobservable Inputs

March 31, 2016

OPCo

						Significant	Forward Price Range
	Fair Value				Valuation	Unobservable					Weighted
	Assets		Liabilities		Technique	Input	Low		High		Average
	(in millions)
Energy Contracts	$	—	$	10.9	Discounted Cash Flow	Forward Market Price (a)	$	36.41	$	162.36	$	84.24
						Counterparty Credit Risk (b)	251
Total	$	—	$	10.9

Significant Unobservable Inputs

December 31, 2015

OPCo

Significant

Forward Price Range

Fair Value

Valuation

Unobservable

Weighted

Assets

Liabilities

Technique

Input (a)

Low

High

Average

(in millions)

Energy Contracts

$

16.0

$

0.1

Discounted Cash Flow

Forward Market Price

$

41.61

$

165.36

$

86.84

Significant Unobservable Inputs

March 31, 2016

PSO

						Significant	Forward Price Range
	Fair Value				Valuation	Unobservable						Weighted
	Assets		Liabilities		Technique	Input (a)	Low			High		Average
	(in millions)
FTRs	$	0.7	$	0.1	Discounted Cash Flow	Forward Market Price	$	(17.72	)	$	1.80	$	(0.59	)

Significant Unobservable Inputs

December 31, 2015

PSO

Significant

Forward Price Range

Fair Value

Valuation

Unobservable

Weighted

Assets

Liabilities

Technique

Input (a)

Low

High

Average

(in millions)

FTRs

$

0.7

$

0.1

Discounted Cash Flow

Forward Market Price

$

(6.96

)

$

8.43

$

1.34

Significant Unobservable Inputs

March 31, 2016

SWEPCo

						Significant	Forward Price Range
	Fair Value				Valuation	Unobservable						Weighted
	Assets		Liabilities		Technique	Input (a)	Low			High		Average
	(in millions)
FTRs	$	0.8	$	0.1	Discounted Cash Flow	Forward Market Price	$	(17.72	)	$	1.80	$	(0.59	)

Significant Unobservable Inputs

December 31, 2015

SWEPCo

Significant

Forward Price Range

Fair Value

Valuation

Unobservable

Weighted

Assets

Liabilities

Technique

Input (a)

Low

High

Average

(in millions)

FTRs

$

0.9

$

0.1

Discounted Cash Flow

Forward Market Price

$

(6.96

)

$

8.43

$

1.34

(a) Represents market prices in dollars per MWh.

(b) Represents average price of credit default swaps used to calculate counterparty credit risk, reported in basis points.

NA    Not applicable.

The following table provides sensitivity of fair value measurements to increases (decreases) in significant unobservable inputs related to Energy Contracts and FTRs for the Registrants as of March 31, 2016 and December 31, 2015:

Sensitivity of Fair Value Measurements

Significant Unobservable Input	Position	Change in Input	Impact on Fair Value Measurement
Forward Market Price	Buy	Increase (Decrease)	Higher (Lower)
Forward Market Price	Sell	Increase (Decrease)	Lower (Higher)
Counterparty Credit Risk	Loss	Increase (Decrease)	Higher (Lower)
Counterparty Credit Risk	Gain	Increase (Decrease)	Lower (Higher)

Indiana Michigan Power Co [Member]

Fair Value Measurements

FAIR VALUE MEASUREMENTS

The disclosures in this note apply to all Registrants unless indicated otherwise.

Fair Value Hierarchy and Valuation Techniques

The accounting guidance for “Fair Value Measurements and Disclosures” establishes a fair value hierarchy that prioritizes the inputs used to measure fair value.  The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurement) and the lowest priority to unobservable inputs (Level 3 measurement).  Where observable inputs are available for substantially the full term of the asset or liability, the instrument is categorized in Level 2.  When quoted market prices are not available, pricing may be completed using comparable securities, dealer values, operating data and general market conditions to determine fair value.  Valuation models utilize various inputs such as commodity, interest rate and, to a lesser degree, volatility and credit that include quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in inactive markets, market corroborated inputs (i.e. inputs derived principally from, or correlated to, observable market data) and other observable inputs for the asset or liability.  The amount of risk taken is determined by the Commercial Operations, Energy Supply and Finance groups in accordance with established risk management policies as approved by the Finance Committee of AEP’s Board of Directors. AEPSC’s market risk oversight staff independently monitors risk policies, procedures and risk levels and provides members of the Commercial Operations Risk Committee (Regulated Risk Committee) and the Energy Supply Risk Committee (Competitive Risk Committee) various reports regarding compliance with policies, limits and procedures. The Regulated Risk Committee consists of AEPSC’s Chief Operating Officer, Chief Financial Officer, Executive Vice President of Generation, Senior Vice President of Commercial Operations and Chief Risk Officer. The Competitive Risk Committee consists of AEPSC’s Chief Operating Officer, Chief Financial Officer and Chief Risk Officer in addition to Energy Supply’s President and Vice President.

For commercial activities, exchange traded derivatives, namely futures contracts, are generally fair valued based on unadjusted quoted prices in active markets and are classified as Level 1.  Level 2 inputs primarily consist of OTC broker quotes in moderately active or less active markets, as well as exchange traded contracts where there is insufficient market liquidity to warrant inclusion in Level 1.  Management verifies price curves using these broker quotes and classifies these fair values within Level 2 when substantially all of the fair value can be corroborated.  Management typically obtains multiple broker quotes, which are nonbinding in nature but are based on recent trades in the marketplace.  When multiple broker quotes are obtained, the quoted bid and ask prices are averaged.  In certain circumstances, a broker quote may be discarded if it is a clear outlier.  Management uses a historical correlation analysis between the broker quoted location and the illiquid locations.  If the points are highly correlated, these locations are included within Level 2 as well.  Certain OTC and bilaterally executed derivative instruments are executed in less active markets with a lower availability of pricing information.  Illiquid transactions, complex structured transactions, FTRs and counterparty credit risk may require nonmarket based inputs.  Some of these inputs may be internally developed or extrapolated and utilized to estimate fair value.  When such inputs have a significant impact on the measurement of fair value, the instrument is categorized as Level 3.  The main driver of contracts being classified as Level 3 is the inability to substantiate energy price curves in the market.  A portion of the Level 3 instruments have been economically hedged which limits potential earnings volatility.

AEP utilizes its trustee’s external pricing service to estimate the fair value of the underlying investments held in the nuclear trusts.  AEP’s investment managers review and validate the prices utilized by the trustee to determine fair value.  AEP’s management performs its own valuation testing to verify the fair values of the securities.  AEP receives audit reports of the trustee’s operating controls and valuation processes.  The trustee uses multiple pricing vendors for the assets held in the trusts.

Assets in the nuclear trusts, Cash and Cash Equivalents, Other Temporary Investments and Restricted Cash for Securitized Funding are classified using the following methods.  Equities are classified as Level 1 holdings if they are actively traded on exchanges.  Items classified as Level 1 are investments in money market funds, fixed income and equity mutual funds and domestic equity securities.  They are valued based on observable inputs, primarily unadjusted quoted prices in active markets for identical assets.  Items classified as Level 2 are primarily investments in individual fixed income securities and cash equivalent funds.  Fixed income securities generally do not trade on exchanges and do not have an official closing price but their valuation inputs are based on observable market data.  Pricing vendors calculate bond valuations using financial models and matrices.  The models use observable inputs including yields on benchmark securities, quotes by securities brokers, rating agency actions, discounts or premiums on securities compared to par prices, changes in yields for U.S. Treasury securities, corporate actions by bond issuers, prepayment schedules and histories, economic events and, for certain securities, adjustments to yields to reflect changes in the rate of inflation.  Other securities with model-derived valuation inputs that are observable are also classified as Level 2 investments.  Investments with unobservable valuation inputs are classified as Level 3 investments.

Fair Value Measurements of Long-term Debt

The fair values of Long-term Debt are based on quoted market prices, without credit enhancements, for the same or similar issues and the current interest rates offered for instruments with similar maturities classified as Level 2 measurement inputs.  These instruments are not marked-to-market.  The estimates presented are not necessarily indicative of the amounts that could be realized in a current market exchange.

The book values and fair values of Long-term Debt for the Registrants as of March 31, 2016 and December 31, 2015 are summarized in the following table:

	March 31, 2016				December 31, 2015
Company	Book Value		Fair Value		Book Value		Fair Value
	(in millions)
AEP	$	19,782.6	$	22,052.8	$	19,572.7	$	21,201.3
APCo	3,919.3		4,597.8		3,930.7		4,416.7
I&M	2,366.6		2,595.4		2,000.0		2,193.6
OPCo	2,135.5		2,515.4		2,157.7		2,472.7
PSO	1,286.3		1,463.6		1,286.1		1,402.9
SWEPCo	2,272.4		2,483.4		2,273.5		2,417.2

Fair Value Measurements of Other Temporary Investments (Applies to AEP)

Other Temporary Investments include funds held by trustees primarily for the payment of securitization bonds and securities available for sale, including marketable securities that management intends to hold for less than one year and investments by its protected cell of EIS.

The following is a summary of Other Temporary Investments:

	March 31, 2016
Other Temporary Investments	Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
	(in millions)
Restricted Cash (a)	$	147.4	$	—	$	—	$	147.4
Fixed Income Securities – Mutual Funds	91.4		0.1		—		91.5
Equity Securities – Mutual Funds	13.9		11.7		—		25.6
Total Other Temporary Investments	$	252.7	$	11.8	$	—	$	264.5

	December 31, 2015
Other Temporary Investments	Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	(in millions)
Restricted Cash (a)	$	271.0	$	—	$	—		$	271.0
Fixed Income Securities – Mutual Funds	91.1		—		(0.7		)	90.4
Equity Securities – Mutual Funds	13.7		11.7		—			25.4
Total Other Temporary Investments	$	375.8	$	11.7	$	(0.7	)	$	386.8

(a) Primarily represents amounts held for the repayment of debt.

The following table provides the activity for fixed income and equity securities within Other Temporary Investments for the three months ended March 31, 2016 and 2015:

	Three Months Ended March 31,
	2016		2015
	(in millions)
Proceeds from Investment Sales	$	—	$	—
Purchases of Investments	0.4		0.4
Gross Realized Gains on Investment Sales	—		—
Gross Realized Losses on Investment Sales	—		—

As of March 31, 2016 and December 31, 2015, AEP had no Other Temporary Investments with an unrealized loss position.  As of March 31, 2016, fixed income securities were primarily debt based mutual funds with short and intermediate maturities.  Mutual funds may be sold and do not contain maturity dates.

For details of the reasons for changes in Securities Available for Sale included in Accumulated Other Comprehensive Income (Loss) for the three months ended March 31, 2016 and 2015, see Note 3.

Fair Value Measurements of Trust Assets for Decommissioning and SNF Disposal (Applies to AEP and I&M)

Nuclear decommissioning and spent nuclear fuel trust funds represent funds that regulatory commissions allow I&M to collect through rates to fund future decommissioning and spent nuclear fuel disposal liabilities.  By rules or orders, the IURC, the MPSC and the FERC established investment limitations and general risk management guidelines.  In general, limitations include:

• Acceptable investments (rated investment grade or above when purchased).

• Maximum percentage invested in a specific type of investment.

• Prohibition of investment in obligations of AEP, I&M or their affiliates.

• Withdrawals permitted only for payment of decommissioning costs and trust expenses.

I&M maintains trust records for each regulatory jurisdiction.  Regulatory approval is required to withdraw decommissioning funds. These funds are managed by external investment managers who must comply with the guidelines and rules of the applicable regulatory authorities.  The trust assets are invested to optimize the net of tax earnings of the trust giving consideration to liquidity, risk, diversification and other prudent investment objectives.

I&M records securities held in these trust funds in Spent Nuclear Fuel and Decommissioning Trusts on its balance sheets. I&M records these securities at fair value.  I&M classifies securities in the trust funds as available-for-sale due to their long-term purpose.  Other-than-temporary impairments for investments in both debt and equity securities are considered realized losses as a result of securities being managed by an external investment management firm.  The external investment management firm makes specific investment decisions regarding the debt and equity investments held in these trusts and generally intends to sell debt securities in an unrealized loss position as part of a tax optimization strategy.  Impairments reduce the cost basis of the securities which will affect any future unrealized gain or realized gain or loss due to the adjusted cost of investment.  I&M records unrealized gains and other-than-temporary impairments from securities in these trust funds as adjustments to the regulatory liability account for the nuclear decommissioning trust funds and to regulatory assets or liabilities for the SNF disposal trust funds in accordance with their treatment in rates.  Consequently, changes in fair value of trust assets do not affect earnings or AOCI.

The following is a summary of nuclear trust fund investments as of March 31, 2016 and December 31, 2015:

	March 31, 2016							December 31, 2015
	Fair Value		Gross Unrealized Gains		Other-Than-Temporary Impairments			Fair Value		Gross Unrealized Gains		Other-Than-Temporary Impairments
	(in millions)
Cash and Cash Equivalents	$	142.0	$	—	$	—		$	168.3	$	—	$	—
Fixed Income Securities:
United States Government	761.1		52.3		(2.1		)	731.1		35.9		(2.6		)
Corporate Debt	68.9		4.9		(1.0		)	57.9		3.2		(1.1		)
State and Local Government	29.0		1.2		(0.3		)	22.2		1.1		(0.3		)
Subtotal Fixed Income Securities	859.0		58.4		(3.4		)	811.2		40.2		(4.0		)
Equity Securities - Domestic	1,151.4		583.5		(78.9		)	1,126.9		571.6		(79.3		)
Spent Nuclear Fuel and Decommissioning Trusts	$	2,152.4	$	641.9	$	(82.3	)	$	2,106.4	$	611.8	$	(83.3	)

The following table provides the securities activity within the decommissioning and SNF trusts for the three months ended March 31, 2016 and 2015:

	Three Months Ended March 31,
	2016		2015
	(in millions)
Proceeds from Investment Sales	$	1,137.7	$	228.2
Purchases of Investments	1,151.6		245.8
Gross Realized Gains on Investment Sales	15.8		11.2
Gross Realized Losses on Investment Sales	7.8		3.8

The adjusted cost of fixed income securities was $801 million and $771 million as of March 31, 2016 and December 31, 2015, respectively.  The adjusted cost of equity securities was $568 million and $555 million as of March 31, 2016 and December 31, 2015, respectively.

The fair value of fixed income securities held in the nuclear trust funds, summarized by contractual maturities, as of March 31, 2016 was as follows:

	Fair Value of Fixed Income Securities
	(in millions)
Within 1 year	$	175.4
1 year – 5 years	369.6
5 years – 10 years	133.0
After 10 years	181.0
Total	$	859.0

Fair Value Measurements of Financial Assets and Liabilities

The following tables set forth, by level within the fair value hierarchy, the Registrants’ financial assets and liabilities that were accounted for at fair value on a recurring basis as of March 31, 2016 and December 31, 2015.  As required by the accounting guidance for “Fair Value Measurements and Disclosures,” financial assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement.  Management’s assessment of the significance of a particular input to the fair value measurement requires judgment and may affect the valuation of fair value assets and liabilities and their placement within the fair value hierarchy levels.  There have not been any significant changes in management’s valuation techniques.

AEP

Assets and Liabilities Measured at Fair Value on a Recurring Basis

March 31, 2016

	Level 1		Level 2		Level 3		Other			Total
Assets:	(in millions)
Cash and Cash Equivalents (a)	$	9.6	$	4.4	$	—	$	176.4		$	190.4
Other Temporary Investments
Restricted Cash (a)	129.2		7.6		—		10.6			147.4
Fixed Income Securities – Mutual Funds	91.5		—		—		—			91.5
Equity Securities – Mutual Funds (b)	25.6		—		—		—			25.6
TotalOther Temporary Investments	246.3		7.6		—		10.6			264.5
Risk Management Assets
Risk Management Commodity Contracts (c) (d)	10.7		585.5		201.8		(346.0		)	452.0
Cash Flow Hedges:
Commodity Hedges (c)	—		11.4		8.1		0.3			19.8
Fair Value Hedges	—		0.5		—		0.4			0.9
Total Risk Management Assets	10.7		597.4		209.9		(345.3		)	472.7
Spent Nuclear Fuel and Decommissioning Trusts
Cash and Cash Equivalents (e)	135.3		—		—		6.7			142.0
Fixed Income Securities:
United States Government	—		761.1		—		—			761.1
Corporate Debt	—		68.9		—		—			68.9
State and Local Government	—		29.0		—		—			29.0
Subtotal Fixed Income Securities	—		859.0		—		—			859.0
Equity Securities – Domestic (b)	1,151.4		—		—		—			1,151.4
TotalSpent Nuclear Fuel and Decommissioning Trusts	1,286.7		859.0		—		6.7			2,152.4
Total Assets	$	1,553.3	$	1,468.4	$	209.9	$	(151.6	)	$	3,080.0
Liabilities:
Risk Management Liabilities
Risk Management Commodity Contracts (c) (d)	$	20.5	$	569.2	$	58.5	$	(377.2	)	$	271.0
Cash Flow Hedges:
Commodity Hedges (c)	—		29.7		10.1		0.3			40.1
Interest Rate/Foreign Currency Hedges	—		0.4		—		—			0.4
Fair Value Hedges	—		—		—		0.4			0.4
Total Risk Management Liabilities	$	20.5	$	599.3	$	68.6	$	(376.5	)	$	311.9

AEP

Assets and Liabilities Measured at Fair Value on a Recurring Basis

December 31, 2015

	Level 1		Level 2		Level 3		Other			Total
Assets:	(in millions)
Cash and Cash Equivalents (a)	$	3.9	$	4.3	$	—	$	168.2		$	176.4
Other Temporary Investments
Restricted Cash (a)	230.0		7.7		—		33.3			271.0
Fixed Income Securities – Mutual Funds	90.4		—		—		—			90.4
Equity Securities – Mutual Funds (b)	25.4		—		—		—			25.4
TotalOther Temporary Investments	345.8		7.7		—		33.3			386.8
Risk Management Assets
Risk Management Commodity Contracts (c) (f)	11.5		495.0		219.7		(287.7		)	438.5
Cash Flow Hedges:
Commodity Hedges (c)	—		15.9		1.0		0.7			17.6
Fair Value Hedges	—		—		—		0.1			0.1
Total Risk Management Assets	11.5		510.9		220.7		(286.9		)	456.2
Spent Nuclear Fuel and Decommissioning Trusts
Cash and Cash Equivalents (e)	160.5		—		—		7.8			168.3
Fixed Income Securities:
United States Government	—		731.1		—		—			731.1
Corporate Debt	—		57.9		—		—			57.9
State and Local Government	—		22.2		—		—			22.2
Subtotal Fixed Income Securities	—		811.2		—		—			811.2
Equity Securities – Domestic (b)	1,126.9		—		—		—			1,126.9
TotalSpent Nuclear Fuel and Decommissioning Trusts	1,287.4		811.2		—		7.8			2,106.4
Total Assets	$	1,648.6	$	1,334.1	$	220.7	$	(77.6	)	$	3,125.8
Liabilities:
Risk Management Liabilities
Risk Management Commodity Contracts (c) (f)	$	24.1	$	471.5	$	67.3	$	(326.3	)	$	236.6
Cash Flow Hedges:
Commodity Hedges (c)	—		18.9		6.5		0.7			26.1
Interest Rate/Foreign Currency Hedges	—		0.4		—		—			0.4
Fair Value Hedges	—		3.0		—		0.1			3.1
Total Risk Management Liabilities	$	24.1	$	493.8	$	73.8	$	(325.5	)	$	266.2

APCo

Assets and Liabilities Measured at Fair Value on a Recurring Basis

March 31, 2016

	Level 1		Level 2		Level 3		Other			Total
Assets:	(in millions)
Restricted Cash for Securitized Funding (a)	$	7.5	$	—	$	—	$	0.1		$	7.6
Risk Management Assets - Nonaffiliated and Affiliated
Risk Management Commodity Contracts (c) (g)	0.2		16.2		8.2		(12.4		)	12.2
Total Assets:	$	7.7	$	16.2	$	8.2	$	(12.3	)	$	19.8
Liabilities:
Risk Management Liabilities - Nonaffiliated
Risk Management Commodity Contracts (c) (g)	$	0.2	$	17.7	$	5.6	$	(13.0	)	$	10.5

APCo

Assets and Liabilities Measured at Fair Value on a Recurring Basis

December 31, 2015

	Level 1		Level 2		Level 3		Other			Total
Assets:	(in millions)
Restricted Cash for Securitized Funding (a)	$	14.8	$	—	$	—	$	0.1		$	14.9
Risk Management Assets - Nonaffiliated and Affiliated
Risk Management Commodity Contracts (c) (g)	0.2		13.9		12.2		(10.6		)	15.7
Total Assets:	$	15.0	$	13.9	$	12.2	$	(10.5	)	$	30.6
Liabilities:
Risk Management Liabilities - Nonaffiliated
Risk Management Commodity Contracts (c) (g)	$	0.2	$	17.8	$	0.5	$	(13.6	)	$	4.9

I&M

Assets and Liabilities Measured at Fair Value on a Recurring Basis

March 31, 2016

	Level 1		Level 2		Level 3		Other			Total
Assets:	(in millions)
Risk Management Assets - Nonaffiliated and Affiliated
Risk Management Commodity Contracts (c) (g)	$	0.1	$	12.5	$	5.5	$	(8.6	)	$	9.5
Spent Nuclear Fuel and Decommissioning Trusts
Cash and Cash Equivalents (e)	135.3		—		—		6.7			142.0
Fixed Income Securities:
United States Government	—		761.1		—		—			761.1
Corporate Debt	—		68.9		—		—			68.9
State and Local Government	—		29.0		—		—			29.0
Subtotal Fixed Income Securities	—		859.0		—		—			859.0
Equity Securities - Domestic (b)	1,151.4		—		—		—			1,151.4
TotalSpent Nuclear Fuel and Decommissioning Trusts	1,286.7		859.0		—		6.7			2,152.4
Total Assets	$	1,286.8	$	871.5	$	5.5	$	(1.9	)	$	2,161.9
Liabilities:
Risk Management Liabilities - Nonaffiliated
Risk Management Commodity Contracts (c) (g)	$	0.1	$	14.2	$	1.8	$	(8.7	)	$	7.4

I&M

Assets and Liabilities Measured at Fair Value on a Recurring Basis

December 31, 2015

	Level 1		Level 2		Level 3		Other			Total
Assets:	(in millions)
Risk Management Assets - Nonaffiliated and Affiliated
Risk Management Commodity Contracts (c) (g)	$	0.1	$	17.0	$	6.3	$	(11.1	)	$	12.3
Spent Nuclear Fuel and Decommissioning Trusts
Cash and Cash Equivalents (e)	160.5		—		—		7.8			168.3
Fixed Income Securities:
United States Government	—		731.1		—		—			731.1
Corporate Debt	—		57.9		—		—			57.9
State and Local Government	—		22.2		—		—			22.2
Subtotal Fixed Income Securities	—		811.2		—		—			811.2
Equity Securities - Domestic (b)	1,126.9		—		—		—			1,126.9
TotalSpent Nuclear Fuel and Decommissioning Trusts	1,287.4		811.2		—		7.8			2,106.4
Total Assets	$	1,287.5	$	828.2	$	6.3	$	(3.3	)	$	2,118.7
Liabilities:
Risk Management Liabilities - Nonaffiliated
Risk Management Commodity Contracts (c) (g)	$	0.1	$	17.5	$	2.0	$	(11.7	)	$	7.9

OPCo

Assets and Liabilities Measured at Fair Value on a Recurring Basis

March 31, 2016

	Level 1		Level 2		Level 3		Other			Total
Assets:	(in millions)
Restricted Cash for Securitized Funding (a)	$	16.2	$	—	$	—	$	—		$	16.2
Liabilities:
Risk Management Liabilities
Risk Management Commodity Contracts (c) (g)	$	—	$	0.6	$	10.9	$	(0.2	)	$	11.3

OPCo

Assets and Liabilities Measured at Fair Value on a Recurring Basis

December 31, 2015

	Level 1		Level 2		Level 3		Other		Total
Assets:	(in millions)
Restricted Cash for Securitized Funding (a)	$	—	$	—	$	—	$	27.7	$	27.7
Risk Management Assets
Risk Management Commodity Contracts (c) (g)	—		—		16.0		3.2		19.2
Total Assets	$	—	$	—	$	16.0	$	30.9	$	46.9
Liabilities:
Risk Management Liabilities
Risk Management Commodity Contracts (c) (g)	$	—	$	0.8	$	0.1	$	2.7	$	3.6

PSO

Assets and Liabilities Measured at Fair Value on a Recurring Basis

March 31, 2016

	Level 1		Level 2		Level 3		Other			Total
Assets:	(in millions)
Risk Management Assets
Risk Management Commodity Contracts (c) (g)	$	—	$	0.1	$	0.7	$	(0.1	)	$	0.7
Liabilities:
Risk Management Liabilities
Risk Management Commodity Contracts (c) (g)	$	—	$	0.3	$	0.1	$	(0.2	)	$	0.2

PSO

Assets and Liabilities Measured at Fair Value on a Recurring Basis

December 31, 2015

	Level 1		Level 2		Level 3		Other			Total
Assets:	(in millions)
Risk Management Assets
Risk Management Commodity Contracts (c) (g)	$	—	$	—	$	0.7	$	(0.1	)	$	0.6
Liabilities:
Risk Management Liabilities
Risk Management Commodity Contracts (c) (g)	$	—	$	0.5	$	0.1	$	(0.4	)	$	0.2

SWEPCo

Assets and Liabilities Measured at Fair Value on a Recurring Basis

March 31, 2016

	Level 1		Level 2		Level 3		Other			Total
Assets:	(in millions)
Cash and Cash Equivalents (a)	$	9.4	$	—	$	—	$	2.9		$	12.3
Risk Management Assets
Risk Management Commodity Contracts (c) (g)	—		0.1		0.8		(0.1		)	0.8
Total Assets	$	9.4	$	0.1	$	0.8	$	2.8		$	13.1
Liabilities:
Risk Management Liabilities
Risk Management Commodity Contracts (c) (g)	$	—	$	5.5	$	0.1	$	(0.3	)	$	5.3

SWEPCo

Assets and Liabilities Measured at Fair Value on a Recurring Basis

December 31, 2015

	Level 1		Level 2		Level 3		Other			Total
Assets:	(in millions)
Cash and Cash Equivalents (a)	$	3.6	$	—	$	—	$	1.6		$	5.2
Risk Management Assets
Risk Management Commodity Contracts (c) (g)	—		—		0.9		(0.1		)	0.8
Total Assets	$	3.6	$	—	$	0.9	$	1.5		$	6.0
Liabilities:
Risk Management Liabilities
Risk Management Commodity Contracts (c) (g)	$	—	$	5.5	$	0.1	$	(0.4	)	$	5.2

(a) Amounts in “Other’’ column primarily represent cash deposits in bank accounts with financial institutions or with third parties.  Level 1 and Level 2 amounts primarily represent investments in money market funds.

(b) Amounts represent publicly traded equity securities and equity-based mutual funds.

(c) Amounts in “Other’’ column primarily represent counterparty netting of risk management and hedging contracts and associated cash collateral under the accounting guidance for “Derivatives and Hedging.’’

(d) The March 31, 2016 maturity of the net fair value of risk management contracts prior to cash collateral, assets/(liabilities), is as follows:  Level 1 matures $(5) million in 2016 and $(5) million in periods 2017-2019;  Level 2 matures $3 million in 2016, $9 million in periods 2017-2019, $3 million in periods 2020-2021 and $1 million in periods 2022-2032;  Level 3 matures $17 million in 2016, $37 million in periods 2017-2019, $21 million in periods 2020-2021 and $69 million in periods 2022-2032.  Risk management commodity contracts are substantially comprised of power contracts.

(e) Amounts in “Other’’ column primarily represent accrued interest receivables from financial institutions.  Level 1 amounts primarily represent investments in money market funds.

(f) The December 31, 2015 maturity of the net fair value of risk management contracts prior to cash collateral, assets/(liabilities), is as follows:  Level 1 matures $(9) million in 2016 and $(4) million in periods 2017-2019;  Level 2 matures $2 million in 2016, $18 million in periods 2017-2019 and $4 million in periods 2020-2021; Level 3 matures $28 million in 2016, $29 million in periods 2017-2019, $19 million in periods 2020-2021 and $76 million in periods 2022-2032.  Risk management commodity contracts are substantially comprised of power contracts.

(g) Substantially comprised of power contracts for APCo, I&M and OPCo and coal contracts for PSO and SWEPCo.

There were no transfers between Level 1 and Level 2 during the three months ended March 31, 2016 and 2015.

The following tables set forth a reconciliation of changes in the fair value of net trading derivatives classified as Level 3 in the fair value hierarchy:

Three Months Ended March 31, 2016	AEP			APCo (a)			I&M (a)			OPCo			PSO			SWEPCo
	(in millions)
Balance as of December 31, 2015	$	146.9		$	11.7		$	4.3		$	15.9		$	0.6		$	0.8
Realized Gain (Loss) Included in Net Income (or Changes in Net Assets) (b) (c)	23.5			15.3			2.5			(0.6		)	(0.8		)	4.6
Unrealized Gain (Loss) Included in Net Income (or Changes in Net Assets) Relating to Assets Still Held at the Reporting Date (b)	21.9			—			—			—			—			—
Realized and Unrealized Gains (Losses) Included in Other Comprehensive Income	1.3			—			—			—			—			—
Purchases, Issuances and Settlements (d)	(42.7		)	(27.7		)	(4.6		)	1.4			0.5			(4.9		)
Transfers out of Level 3 (f) (g)	10.9			0.1			0.1			—			—			—
Changes in Fair Value Allocated to Regulated Jurisdictions (h)	(20.5		)	3.2			1.4			(27.6		)	0.3			0.2
Balance as of March 31, 2016	$	141.3		$	2.6		$	3.7		$	(10.9	)	$	0.6		$	0.7

Three Months Ended March 31, 2015	AEP			APCo			I&M			OPCo			PSO			SWEPCo
	(in millions)
Balance as of December 31, 2014	$	150.8		$	15.8		$	14.7		$	48.4		$	(0.3	)	$	(0.5	)
Realized Gain (Loss) Included in Net Income (or Changes in Net Assets) (b) (c)	8.6			2.2			0.1			0.2			(0.3		)	5.8
Unrealized Gain (Loss) Included in Net Income (or Changes in Net Assets) Relating to Assets Still Held at the Reporting Date (b)	5.2			—			—			—			—			—
Realized and Unrealized Gains (Losses) Included in Other Comprehensive Income	(1.9		)	—			—			—			—			—
Purchases, Issuances and Settlements (d)	(38.5		)	(13.4		)	(9.0		)	(6.8		)	0.6			(5.3		)
Transfers into Level 3 (e) (f)	15.3			—			—			—			—			—
Transfers out of Level 3 (f) (g)	(12.4		)	—			—			—			—			—
Changes in Fair Value Allocated to Regulated Jurisdictions (h)	3.5			1.4			(0.2		)	4.1			(0.7		)	(1.2		)
Balance as of March 31, 2015	$	130.6		$	6.0		$	5.6		$	45.9		$	(0.7	)	$	(1.2	)

(a) Includes both affiliated and nonaffiliated transactions.

(b) Included in revenues on the condensed statements of income.

(c) Represents the change in fair value between the beginning of the reporting period and the settlement of the risk management commodity contract.

(d) Represents the settlement of risk management commodity contracts for the reporting period.

(e) Represents existing assets or liabilities that were previously categorized as Level 2.

(f) Transfers are recognized based on their value at the beginning of the reporting period that the transfer occurred.

(g) Represents existing assets or liabilities that were previously categorized as Level 3.

(h) Relates to the net gains (losses) of those contracts that are not reflected on the condensed statements of income.  These net gains (losses) are recorded as regulatory liabilities/assets.

The following tables quantify the significant unobservable inputs used in developing the fair value of Level 3 positions as of March 31, 2016 and December 31, 2015:

Significant Unobservable Inputs

March 31, 2016

AEP

						Significant	Input/Range
	Fair Value				Valuation	Unobservable						Weighted
	Assets		Liabilities		Technique	Input	Low			High		Average
	(in millions)
Energy Contracts	$	207.6	$	59.5	Discounted Cash Flow	Forward Market Price (a)	$	8.77		$	162.36	$	45.45
						Counterparty Credit Risk (b)	251			669		NA
FTRs	2.3		9.1		Discounted Cash Flow	Forward Market Price (a)	$	(17.72	)	$	10.50	$	0.60
Total	$	209.9	$	68.6

Significant Unobservable Inputs

December 31, 2015

AEP

						Significant	Input/Range
	Fair Value				Valuation	Unobservable						Weighted
	Assets		Liabilities		Technique	Input	Low			High		Average
	(in millions)
Energy Contracts	$	212.3	$	70.3	Discounted Cash Flow	Forward Market Price (a)	$	9.69		$	165.36	$	36.35
						Counterparty Credit Risk (b)	670
FTRs	8.4		3.5		Discounted Cash Flow	Forward Market Price (a)	$	(6.99	)	$	10.34	$	1.10
Total	$	220.7	$	73.8

Significant Unobservable Inputs

March 31, 2016

APCo

						Significant	Forward Price Range
	Fair Value				Valuation	Unobservable					Weighted
	Assets		Liabilities		Technique	Input (a)	Low		High		Average
	(in millions)
Energy Contracts	$	8.2	$	0.1	Discounted Cash Flow	Forward Market Price	$	8.77	$	47.05	$	29.14
FTRs	—		5.5		Discounted Cash Flow	Forward Market Price	0.42		5.58		1.90
Total	$	8.2	$	5.6

Significant Unobservable Inputs

December 31, 2015

APCo

						Significant	Forward Price Range
	Fair Value				Valuation	Unobservable						Weighted
	Assets		Liabilities		Technique	Input (a)	Low			High		Average
	(in millions)
Energy Contracts	$	7.9	$	0.2	Discounted Cash Flow	Forward Market Price	$	12.61		$	47.24	$	32.38
FTRs	4.3		0.3		Discounted Cash Flow	Forward Market Price	(6.96		)	8.43		1.34
Total	$	12.2	$	0.5

Significant Unobservable Inputs

March 31, 2016

I&M

						Significant	Forward Price Range
	Fair Value				Valuation	Unobservable						Weighted
	Assets		Liabilities		Technique	Input (a)	Low			High		Average
	(in millions)
Energy Contracts	$	5.5	$	0.1	Discounted Cash Flow	Forward Market Price	$	8.77		$	47.05	$	29.14
FTRs	—		1.7		Discounted Cash Flow	Forward Market Price	(0.07		)	5.58		0.42
Total	$	5.5	$	1.8

Significant Unobservable Inputs

December 31, 2015

I&M

						Significant	Forward Price Range
	Fair Value				Valuation	Unobservable						Weighted
	Assets		Liabilities		Technique	Input (a)	Low			High		Average
	(in millions)
Energy Contracts	$	6.0	$	0.2	Discounted Cash Flow	Forward Market Price	$	12.61		$	47.24	$	32.38
FTRs	0.3		1.8		Discounted Cash Flow	Forward Market Price	(6.96		)	8.43		1.34
Total	$	6.3	$	2.0

Significant Unobservable Inputs

March 31, 2016

OPCo

						Significant	Forward Price Range
	Fair Value				Valuation	Unobservable					Weighted
	Assets		Liabilities		Technique	Input	Low		High		Average
	(in millions)
Energy Contracts	$	—	$	10.9	Discounted Cash Flow	Forward Market Price (a)	$	36.41	$	162.36	$	84.24
						Counterparty Credit Risk (b)	251
Total	$	—	$	10.9

Significant Unobservable Inputs

December 31, 2015

OPCo

Significant

Forward Price Range

Fair Value

Valuation

Unobservable

Weighted

Assets

Liabilities

Technique

Input (a)

Low

High

Average

(in millions)

Energy Contracts

$

16.0

$

0.1

Discounted Cash Flow

Forward Market Price

$

41.61

$

165.36

$

86.84

Significant Unobservable Inputs

March 31, 2016

PSO

						Significant	Forward Price Range
	Fair Value				Valuation	Unobservable						Weighted
	Assets		Liabilities		Technique	Input (a)	Low			High		Average
	(in millions)
FTRs	$	0.7	$	0.1	Discounted Cash Flow	Forward Market Price	$	(17.72	)	$	1.80	$	(0.59	)

Significant Unobservable Inputs

December 31, 2015

PSO

Significant

Forward Price Range

Fair Value

Valuation

Unobservable

Weighted

Assets

Liabilities

Technique

Input (a)

Low

High

Average

(in millions)

FTRs

$

0.7

$

0.1

Discounted Cash Flow

Forward Market Price

$

(6.96

)

$

8.43

$

1.34

Significant Unobservable Inputs

March 31, 2016

SWEPCo

						Significant	Forward Price Range
	Fair Value				Valuation	Unobservable						Weighted
	Assets		Liabilities		Technique	Input (a)	Low			High		Average
	(in millions)
FTRs	$	0.8	$	0.1	Discounted Cash Flow	Forward Market Price	$	(17.72	)	$	1.80	$	(0.59	)

Significant Unobservable Inputs

December 31, 2015

SWEPCo

Significant

Forward Price Range

Fair Value

Valuation

Unobservable

Weighted

Assets

Liabilities

Technique

Input (a)

Low

High

Average

(in millions)

FTRs

$

0.9

$

0.1

Discounted Cash Flow

Forward Market Price

$

(6.96

)

$

8.43

$

1.34

(a) Represents market prices in dollars per MWh.

(b) Represents average price of credit default swaps used to calculate counterparty credit risk, reported in basis points.

NA    Not applicable.

The following table provides sensitivity of fair value measurements to increases (decreases) in significant unobservable inputs related to Energy Contracts and FTRs for the Registrants as of March 31, 2016 and December 31, 2015:

Sensitivity of Fair Value Measurements

Significant Unobservable Input	Position	Change in Input	Impact on Fair Value Measurement
Forward Market Price	Buy	Increase (Decrease)	Higher (Lower)
Forward Market Price	Sell	Increase (Decrease)	Lower (Higher)
Counterparty Credit Risk	Loss	Increase (Decrease)	Higher (Lower)
Counterparty Credit Risk	Gain	Increase (Decrease)	Lower (Higher)

Ohio Power Co [Member]

Fair Value Measurements

FAIR VALUE MEASUREMENTS

The disclosures in this note apply to all Registrants unless indicated otherwise.

Fair Value Hierarchy and Valuation Techniques

The accounting guidance for “Fair Value Measurements and Disclosures” establishes a fair value hierarchy that prioritizes the inputs used to measure fair value.  The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurement) and the lowest priority to unobservable inputs (Level 3 measurement).  Where observable inputs are available for substantially the full term of the asset or liability, the instrument is categorized in Level 2.  When quoted market prices are not available, pricing may be completed using comparable securities, dealer values, operating data and general market conditions to determine fair value.  Valuation models utilize various inputs such as commodity, interest rate and, to a lesser degree, volatility and credit that include quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in inactive markets, market corroborated inputs (i.e. inputs derived principally from, or correlated to, observable market data) and other observable inputs for the asset or liability.  The amount of risk taken is determined by the Commercial Operations, Energy Supply and Finance groups in accordance with established risk management policies as approved by the Finance Committee of AEP’s Board of Directors. AEPSC’s market risk oversight staff independently monitors risk policies, procedures and risk levels and provides members of the Commercial Operations Risk Committee (Regulated Risk Committee) and the Energy Supply Risk Committee (Competitive Risk Committee) various reports regarding compliance with policies, limits and procedures. The Regulated Risk Committee consists of AEPSC’s Chief Operating Officer, Chief Financial Officer, Executive Vice President of Generation, Senior Vice President of Commercial Operations and Chief Risk Officer. The Competitive Risk Committee consists of AEPSC’s Chief Operating Officer, Chief Financial Officer and Chief Risk Officer in addition to Energy Supply’s President and Vice President.

For commercial activities, exchange traded derivatives, namely futures contracts, are generally fair valued based on unadjusted quoted prices in active markets and are classified as Level 1.  Level 2 inputs primarily consist of OTC broker quotes in moderately active or less active markets, as well as exchange traded contracts where there is insufficient market liquidity to warrant inclusion in Level 1.  Management verifies price curves using these broker quotes and classifies these fair values within Level 2 when substantially all of the fair value can be corroborated.  Management typically obtains multiple broker quotes, which are nonbinding in nature but are based on recent trades in the marketplace.  When multiple broker quotes are obtained, the quoted bid and ask prices are averaged.  In certain circumstances, a broker quote may be discarded if it is a clear outlier.  Management uses a historical correlation analysis between the broker quoted location and the illiquid locations.  If the points are highly correlated, these locations are included within Level 2 as well.  Certain OTC and bilaterally executed derivative instruments are executed in less active markets with a lower availability of pricing information.  Illiquid transactions, complex structured transactions, FTRs and counterparty credit risk may require nonmarket based inputs.  Some of these inputs may be internally developed or extrapolated and utilized to estimate fair value.  When such inputs have a significant impact on the measurement of fair value, the instrument is categorized as Level 3.  The main driver of contracts being classified as Level 3 is the inability to substantiate energy price curves in the market.  A portion of the Level 3 instruments have been economically hedged which limits potential earnings volatility.

AEP utilizes its trustee’s external pricing service to estimate the fair value of the underlying investments held in the nuclear trusts.  AEP’s investment managers review and validate the prices utilized by the trustee to determine fair value.  AEP’s management performs its own valuation testing to verify the fair values of the securities.  AEP receives audit reports of the trustee’s operating controls and valuation processes.  The trustee uses multiple pricing vendors for the assets held in the trusts.

Assets in the nuclear trusts, Cash and Cash Equivalents, Other Temporary Investments and Restricted Cash for Securitized Funding are classified using the following methods.  Equities are classified as Level 1 holdings if they are actively traded on exchanges.  Items classified as Level 1 are investments in money market funds, fixed income and equity mutual funds and domestic equity securities.  They are valued based on observable inputs, primarily unadjusted quoted prices in active markets for identical assets.  Items classified as Level 2 are primarily investments in individual fixed income securities and cash equivalent funds.  Fixed income securities generally do not trade on exchanges and do not have an official closing price but their valuation inputs are based on observable market data.  Pricing vendors calculate bond valuations using financial models and matrices.  The models use observable inputs including yields on benchmark securities, quotes by securities brokers, rating agency actions, discounts or premiums on securities compared to par prices, changes in yields for U.S. Treasury securities, corporate actions by bond issuers, prepayment schedules and histories, economic events and, for certain securities, adjustments to yields to reflect changes in the rate of inflation.  Other securities with model-derived valuation inputs that are observable are also classified as Level 2 investments.  Investments with unobservable valuation inputs are classified as Level 3 investments.

Fair Value Measurements of Long-term Debt

The fair values of Long-term Debt are based on quoted market prices, without credit enhancements, for the same or similar issues and the current interest rates offered for instruments with similar maturities classified as Level 2 measurement inputs.  These instruments are not marked-to-market.  The estimates presented are not necessarily indicative of the amounts that could be realized in a current market exchange.

The book values and fair values of Long-term Debt for the Registrants as of March 31, 2016 and December 31, 2015 are summarized in the following table:

	March 31, 2016				December 31, 2015
Company	Book Value		Fair Value		Book Value		Fair Value
	(in millions)
AEP	$	19,782.6	$	22,052.8	$	19,572.7	$	21,201.3
APCo	3,919.3		4,597.8		3,930.7		4,416.7
I&M	2,366.6		2,595.4		2,000.0		2,193.6
OPCo	2,135.5		2,515.4		2,157.7		2,472.7
PSO	1,286.3		1,463.6		1,286.1		1,402.9
SWEPCo	2,272.4		2,483.4		2,273.5		2,417.2

Fair Value Measurements of Other Temporary Investments (Applies to AEP)

Other Temporary Investments include funds held by trustees primarily for the payment of securitization bonds and securities available for sale, including marketable securities that management intends to hold for less than one year and investments by its protected cell of EIS.

The following is a summary of Other Temporary Investments:

	March 31, 2016
Other Temporary Investments	Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
	(in millions)
Restricted Cash (a)	$	147.4	$	—	$	—	$	147.4
Fixed Income Securities – Mutual Funds	91.4		0.1		—		91.5
Equity Securities – Mutual Funds	13.9		11.7		—		25.6
Total Other Temporary Investments	$	252.7	$	11.8	$	—	$	264.5

	December 31, 2015
Other Temporary Investments	Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	(in millions)
Restricted Cash (a)	$	271.0	$	—	$	—		$	271.0
Fixed Income Securities – Mutual Funds	91.1		—		(0.7		)	90.4
Equity Securities – Mutual Funds	13.7		11.7		—			25.4
Total Other Temporary Investments	$	375.8	$	11.7	$	(0.7	)	$	386.8

(a) Primarily represents amounts held for the repayment of debt.

The following table provides the activity for fixed income and equity securities within Other Temporary Investments for the three months ended March 31, 2016 and 2015:

	Three Months Ended March 31,
	2016		2015
	(in millions)
Proceeds from Investment Sales	$	—	$	—
Purchases of Investments	0.4		0.4
Gross Realized Gains on Investment Sales	—		—
Gross Realized Losses on Investment Sales	—		—

As of March 31, 2016 and December 31, 2015, AEP had no Other Temporary Investments with an unrealized loss position.  As of March 31, 2016, fixed income securities were primarily debt based mutual funds with short and intermediate maturities.  Mutual funds may be sold and do not contain maturity dates.

For details of the reasons for changes in Securities Available for Sale included in Accumulated Other Comprehensive Income (Loss) for the three months ended March 31, 2016 and 2015, see Note 3.

Fair Value Measurements of Trust Assets for Decommissioning and SNF Disposal (Applies to AEP and I&M)

Nuclear decommissioning and spent nuclear fuel trust funds represent funds that regulatory commissions allow I&M to collect through rates to fund future decommissioning and spent nuclear fuel disposal liabilities.  By rules or orders, the IURC, the MPSC and the FERC established investment limitations and general risk management guidelines.  In general, limitations include:

• Acceptable investments (rated investment grade or above when purchased).

• Maximum percentage invested in a specific type of investment.

• Prohibition of investment in obligations of AEP, I&M or their affiliates.

• Withdrawals permitted only for payment of decommissioning costs and trust expenses.

I&M maintains trust records for each regulatory jurisdiction.  Regulatory approval is required to withdraw decommissioning funds. These funds are managed by external investment managers who must comply with the guidelines and rules of the applicable regulatory authorities.  The trust assets are invested to optimize the net of tax earnings of the trust giving consideration to liquidity, risk, diversification and other prudent investment objectives.

I&M records securities held in these trust funds in Spent Nuclear Fuel and Decommissioning Trusts on its balance sheets. I&M records these securities at fair value.  I&M classifies securities in the trust funds as available-for-sale due to their long-term purpose.  Other-than-temporary impairments for investments in both debt and equity securities are considered realized losses as a result of securities being managed by an external investment management firm.  The external investment management firm makes specific investment decisions regarding the debt and equity investments held in these trusts and generally intends to sell debt securities in an unrealized loss position as part of a tax optimization strategy.  Impairments reduce the cost basis of the securities which will affect any future unrealized gain or realized gain or loss due to the adjusted cost of investment.  I&M records unrealized gains and other-than-temporary impairments from securities in these trust funds as adjustments to the regulatory liability account for the nuclear decommissioning trust funds and to regulatory assets or liabilities for the SNF disposal trust funds in accordance with their treatment in rates.  Consequently, changes in fair value of trust assets do not affect earnings or AOCI.

The following is a summary of nuclear trust fund investments as of March 31, 2016 and December 31, 2015:

	March 31, 2016							December 31, 2015
	Fair Value		Gross Unrealized Gains		Other-Than-Temporary Impairments			Fair Value		Gross Unrealized Gains		Other-Than-Temporary Impairments
	(in millions)
Cash and Cash Equivalents	$	142.0	$	—	$	—		$	168.3	$	—	$	—
Fixed Income Securities:
United States Government	761.1		52.3		(2.1		)	731.1		35.9		(2.6		)
Corporate Debt	68.9		4.9		(1.0		)	57.9		3.2		(1.1		)
State and Local Government	29.0		1.2		(0.3		)	22.2		1.1		(0.3		)
Subtotal Fixed Income Securities	859.0		58.4		(3.4		)	811.2		40.2		(4.0		)
Equity Securities - Domestic	1,151.4		583.5		(78.9		)	1,126.9		571.6		(79.3		)
Spent Nuclear Fuel and Decommissioning Trusts	$	2,152.4	$	641.9	$	(82.3	)	$	2,106.4	$	611.8	$	(83.3	)

The following table provides the securities activity within the decommissioning and SNF trusts for the three months ended March 31, 2016 and 2015:

	Three Months Ended March 31,
	2016		2015
	(in millions)
Proceeds from Investment Sales	$	1,137.7	$	228.2
Purchases of Investments	1,151.6		245.8
Gross Realized Gains on Investment Sales	15.8		11.2
Gross Realized Losses on Investment Sales	7.8		3.8

The adjusted cost of fixed income securities was $801 million and $771 million as of March 31, 2016 and December 31, 2015, respectively.  The adjusted cost of equity securities was $568 million and $555 million as of March 31, 2016 and December 31, 2015, respectively.

The fair value of fixed income securities held in the nuclear trust funds, summarized by contractual maturities, as of March 31, 2016 was as follows:

	Fair Value of Fixed Income Securities
	(in millions)
Within 1 year	$	175.4
1 year – 5 years	369.6
5 years – 10 years	133.0
After 10 years	181.0
Total	$	859.0

Fair Value Measurements of Financial Assets and Liabilities

The following tables set forth, by level within the fair value hierarchy, the Registrants’ financial assets and liabilities that were accounted for at fair value on a recurring basis as of March 31, 2016 and December 31, 2015.  As required by the accounting guidance for “Fair Value Measurements and Disclosures,” financial assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement.  Management’s assessment of the significance of a particular input to the fair value measurement requires judgment and may affect the valuation of fair value assets and liabilities and their placement within the fair value hierarchy levels.  There have not been any significant changes in management’s valuation techniques.

AEP

Assets and Liabilities Measured at Fair Value on a Recurring Basis

March 31, 2016

	Level 1		Level 2		Level 3		Other			Total
Assets:	(in millions)
Cash and Cash Equivalents (a)	$	9.6	$	4.4	$	—	$	176.4		$	190.4
Other Temporary Investments
Restricted Cash (a)	129.2		7.6		—		10.6			147.4
Fixed Income Securities – Mutual Funds	91.5		—		—		—			91.5
Equity Securities – Mutual Funds (b)	25.6		—		—		—			25.6
TotalOther Temporary Investments	246.3		7.6		—		10.6			264.5
Risk Management Assets
Risk Management Commodity Contracts (c) (d)	10.7		585.5		201.8		(346.0		)	452.0
Cash Flow Hedges:
Commodity Hedges (c)	—		11.4		8.1		0.3			19.8
Fair Value Hedges	—		0.5		—		0.4			0.9
Total Risk Management Assets	10.7		597.4		209.9		(345.3		)	472.7
Spent Nuclear Fuel and Decommissioning Trusts
Cash and Cash Equivalents (e)	135.3		—		—		6.7			142.0
Fixed Income Securities:
United States Government	—		761.1		—		—			761.1
Corporate Debt	—		68.9		—		—			68.9
State and Local Government	—		29.0		—		—			29.0
Subtotal Fixed Income Securities	—		859.0		—		—			859.0
Equity Securities – Domestic (b)	1,151.4		—		—		—			1,151.4
TotalSpent Nuclear Fuel and Decommissioning Trusts	1,286.7		859.0		—		6.7			2,152.4
Total Assets	$	1,553.3	$	1,468.4	$	209.9	$	(151.6	)	$	3,080.0
Liabilities:
Risk Management Liabilities
Risk Management Commodity Contracts (c) (d)	$	20.5	$	569.2	$	58.5	$	(377.2	)	$	271.0
Cash Flow Hedges:
Commodity Hedges (c)	—		29.7		10.1		0.3			40.1
Interest Rate/Foreign Currency Hedges	—		0.4		—		—			0.4
Fair Value Hedges	—		—		—		0.4			0.4
Total Risk Management Liabilities	$	20.5	$	599.3	$	68.6	$	(376.5	)	$	311.9

AEP

Assets and Liabilities Measured at Fair Value on a Recurring Basis

December 31, 2015

	Level 1		Level 2		Level 3		Other			Total
Assets:	(in millions)
Cash and Cash Equivalents (a)	$	3.9	$	4.3	$	—	$	168.2		$	176.4
Other Temporary Investments
Restricted Cash (a)	230.0		7.7		—		33.3			271.0
Fixed Income Securities – Mutual Funds	90.4		—		—		—			90.4
Equity Securities – Mutual Funds (b)	25.4		—		—		—			25.4
TotalOther Temporary Investments	345.8		7.7		—		33.3			386.8
Risk Management Assets
Risk Management Commodity Contracts (c) (f)	11.5		495.0		219.7		(287.7		)	438.5
Cash Flow Hedges:
Commodity Hedges (c)	—		15.9		1.0		0.7			17.6
Fair Value Hedges	—		—		—		0.1			0.1
Total Risk Management Assets	11.5		510.9		220.7		(286.9		)	456.2
Spent Nuclear Fuel and Decommissioning Trusts
Cash and Cash Equivalents (e)	160.5		—		—		7.8			168.3
Fixed Income Securities:
United States Government	—		731.1		—		—			731.1
Corporate Debt	—		57.9		—		—			57.9
State and Local Government	—		22.2		—		—			22.2
Subtotal Fixed Income Securities	—		811.2		—		—			811.2
Equity Securities – Domestic (b)	1,126.9		—		—		—			1,126.9
TotalSpent Nuclear Fuel and Decommissioning Trusts	1,287.4		811.2		—		7.8			2,106.4
Total Assets	$	1,648.6	$	1,334.1	$	220.7	$	(77.6	)	$	3,125.8
Liabilities:
Risk Management Liabilities
Risk Management Commodity Contracts (c) (f)	$	24.1	$	471.5	$	67.3	$	(326.3	)	$	236.6
Cash Flow Hedges:
Commodity Hedges (c)	—		18.9		6.5		0.7			26.1
Interest Rate/Foreign Currency Hedges	—		0.4		—		—			0.4
Fair Value Hedges	—		3.0		—		0.1			3.1
Total Risk Management Liabilities	$	24.1	$	493.8	$	73.8	$	(325.5	)	$	266.2

APCo

Assets and Liabilities Measured at Fair Value on a Recurring Basis

March 31, 2016

	Level 1		Level 2		Level 3		Other			Total
Assets:	(in millions)
Restricted Cash for Securitized Funding (a)	$	7.5	$	—	$	—	$	0.1		$	7.6
Risk Management Assets - Nonaffiliated and Affiliated
Risk Management Commodity Contracts (c) (g)	0.2		16.2		8.2		(12.4		)	12.2
Total Assets:	$	7.7	$	16.2	$	8.2	$	(12.3	)	$	19.8
Liabilities:
Risk Management Liabilities - Nonaffiliated
Risk Management Commodity Contracts (c) (g)	$	0.2	$	17.7	$	5.6	$	(13.0	)	$	10.5

APCo

Assets and Liabilities Measured at Fair Value on a Recurring Basis

December 31, 2015

	Level 1		Level 2		Level 3		Other			Total
Assets:	(in millions)
Restricted Cash for Securitized Funding (a)	$	14.8	$	—	$	—	$	0.1		$	14.9
Risk Management Assets - Nonaffiliated and Affiliated
Risk Management Commodity Contracts (c) (g)	0.2		13.9		12.2		(10.6		)	15.7
Total Assets:	$	15.0	$	13.9	$	12.2	$	(10.5	)	$	30.6
Liabilities:
Risk Management Liabilities - Nonaffiliated
Risk Management Commodity Contracts (c) (g)	$	0.2	$	17.8	$	0.5	$	(13.6	)	$	4.9

I&M

Assets and Liabilities Measured at Fair Value on a Recurring Basis

March 31, 2016

	Level 1		Level 2		Level 3		Other			Total
Assets:	(in millions)
Risk Management Assets - Nonaffiliated and Affiliated
Risk Management Commodity Contracts (c) (g)	$	0.1	$	12.5	$	5.5	$	(8.6	)	$	9.5
Spent Nuclear Fuel and Decommissioning Trusts
Cash and Cash Equivalents (e)	135.3		—		—		6.7			142.0
Fixed Income Securities:
United States Government	—		761.1		—		—			761.1
Corporate Debt	—		68.9		—		—			68.9
State and Local Government	—		29.0		—		—			29.0
Subtotal Fixed Income Securities	—		859.0		—		—			859.0
Equity Securities - Domestic (b)	1,151.4		—		—		—			1,151.4
TotalSpent Nuclear Fuel and Decommissioning Trusts	1,286.7		859.0		—		6.7			2,152.4
Total Assets	$	1,286.8	$	871.5	$	5.5	$	(1.9	)	$	2,161.9
Liabilities:
Risk Management Liabilities - Nonaffiliated
Risk Management Commodity Contracts (c) (g)	$	0.1	$	14.2	$	1.8	$	(8.7	)	$	7.4

I&M

Assets and Liabilities Measured at Fair Value on a Recurring Basis

December 31, 2015

	Level 1		Level 2		Level 3		Other			Total
Assets:	(in millions)
Risk Management Assets - Nonaffiliated and Affiliated
Risk Management Commodity Contracts (c) (g)	$	0.1	$	17.0	$	6.3	$	(11.1	)	$	12.3
Spent Nuclear Fuel and Decommissioning Trusts
Cash and Cash Equivalents (e)	160.5		—		—		7.8			168.3
Fixed Income Securities:
United States Government	—		731.1		—		—			731.1
Corporate Debt	—		57.9		—		—			57.9
State and Local Government	—		22.2		—		—			22.2
Subtotal Fixed Income Securities	—		811.2		—		—			811.2
Equity Securities - Domestic (b)	1,126.9		—		—		—			1,126.9
TotalSpent Nuclear Fuel and Decommissioning Trusts	1,287.4		811.2		—		7.8			2,106.4
Total Assets	$	1,287.5	$	828.2	$	6.3	$	(3.3	)	$	2,118.7
Liabilities:
Risk Management Liabilities - Nonaffiliated
Risk Management Commodity Contracts (c) (g)	$	0.1	$	17.5	$	2.0	$	(11.7	)	$	7.9

OPCo

Assets and Liabilities Measured at Fair Value on a Recurring Basis

March 31, 2016

	Level 1		Level 2		Level 3		Other			Total
Assets:	(in millions)
Restricted Cash for Securitized Funding (a)	$	16.2	$	—	$	—	$	—		$	16.2
Liabilities:
Risk Management Liabilities
Risk Management Commodity Contracts (c) (g)	$	—	$	0.6	$	10.9	$	(0.2	)	$	11.3

OPCo

Assets and Liabilities Measured at Fair Value on a Recurring Basis

December 31, 2015

	Level 1		Level 2		Level 3		Other		Total
Assets:	(in millions)
Restricted Cash for Securitized Funding (a)	$	—	$	—	$	—	$	27.7	$	27.7
Risk Management Assets
Risk Management Commodity Contracts (c) (g)	—		—		16.0		3.2		19.2
Total Assets	$	—	$	—	$	16.0	$	30.9	$	46.9
Liabilities:
Risk Management Liabilities
Risk Management Commodity Contracts (c) (g)	$	—	$	0.8	$	0.1	$	2.7	$	3.6

PSO

Assets and Liabilities Measured at Fair Value on a Recurring Basis

March 31, 2016

	Level 1		Level 2		Level 3		Other			Total
Assets:	(in millions)
Risk Management Assets
Risk Management Commodity Contracts (c) (g)	$	—	$	0.1	$	0.7	$	(0.1	)	$	0.7
Liabilities:
Risk Management Liabilities
Risk Management Commodity Contracts (c) (g)	$	—	$	0.3	$	0.1	$	(0.2	)	$	0.2

PSO

Assets and Liabilities Measured at Fair Value on a Recurring Basis

December 31, 2015

	Level 1		Level 2		Level 3		Other			Total
Assets:	(in millions)
Risk Management Assets
Risk Management Commodity Contracts (c) (g)	$	—	$	—	$	0.7	$	(0.1	)	$	0.6
Liabilities:
Risk Management Liabilities
Risk Management Commodity Contracts (c) (g)	$	—	$	0.5	$	0.1	$	(0.4	)	$	0.2

SWEPCo

Assets and Liabilities Measured at Fair Value on a Recurring Basis

March 31, 2016

	Level 1		Level 2		Level 3		Other			Total
Assets:	(in millions)
Cash and Cash Equivalents (a)	$	9.4	$	—	$	—	$	2.9		$	12.3
Risk Management Assets
Risk Management Commodity Contracts (c) (g)	—		0.1		0.8		(0.1		)	0.8
Total Assets	$	9.4	$	0.1	$	0.8	$	2.8		$	13.1
Liabilities:
Risk Management Liabilities
Risk Management Commodity Contracts (c) (g)	$	—	$	5.5	$	0.1	$	(0.3	)	$	5.3

SWEPCo

Assets and Liabilities Measured at Fair Value on a Recurring Basis

December 31, 2015

	Level 1		Level 2		Level 3		Other			Total
Assets:	(in millions)
Cash and Cash Equivalents (a)	$	3.6	$	—	$	—	$	1.6		$	5.2
Risk Management Assets
Risk Management Commodity Contracts (c) (g)	—		—		0.9		(0.1		)	0.8
Total Assets	$	3.6	$	—	$	0.9	$	1.5		$	6.0
Liabilities:
Risk Management Liabilities
Risk Management Commodity Contracts (c) (g)	$	—	$	5.5	$	0.1	$	(0.4	)	$	5.2

(a) Amounts in “Other’’ column primarily represent cash deposits in bank accounts with financial institutions or with third parties.  Level 1 and Level 2 amounts primarily represent investments in money market funds.

(b) Amounts represent publicly traded equity securities and equity-based mutual funds.

(c) Amounts in “Other’’ column primarily represent counterparty netting of risk management and hedging contracts and associated cash collateral under the accounting guidance for “Derivatives and Hedging.’’

(d) The March 31, 2016 maturity of the net fair value of risk management contracts prior to cash collateral, assets/(liabilities), is as follows:  Level 1 matures $(5) million in 2016 and $(5) million in periods 2017-2019;  Level 2 matures $3 million in 2016, $9 million in periods 2017-2019, $3 million in periods 2020-2021 and $1 million in periods 2022-2032;  Level 3 matures $17 million in 2016, $37 million in periods 2017-2019, $21 million in periods 2020-2021 and $69 million in periods 2022-2032.  Risk management commodity contracts are substantially comprised of power contracts.

(e) Amounts in “Other’’ column primarily represent accrued interest receivables from financial institutions.  Level 1 amounts primarily represent investments in money market funds.

(f) The December 31, 2015 maturity of the net fair value of risk management contracts prior to cash collateral, assets/(liabilities), is as follows:  Level 1 matures $(9) million in 2016 and $(4) million in periods 2017-2019;  Level 2 matures $2 million in 2016, $18 million in periods 2017-2019 and $4 million in periods 2020-2021; Level 3 matures $28 million in 2016, $29 million in periods 2017-2019, $19 million in periods 2020-2021 and $76 million in periods 2022-2032.  Risk management commodity contracts are substantially comprised of power contracts.

(g) Substantially comprised of power contracts for APCo, I&M and OPCo and coal contracts for PSO and SWEPCo.

There were no transfers between Level 1 and Level 2 during the three months ended March 31, 2016 and 2015.

The following tables set forth a reconciliation of changes in the fair value of net trading derivatives classified as Level 3 in the fair value hierarchy:

Three Months Ended March 31, 2016	AEP			APCo (a)			I&M (a)			OPCo			PSO			SWEPCo
	(in millions)
Balance as of December 31, 2015	$	146.9		$	11.7		$	4.3		$	15.9		$	0.6		$	0.8
Realized Gain (Loss) Included in Net Income (or Changes in Net Assets) (b) (c)	23.5			15.3			2.5			(0.6		)	(0.8		)	4.6
Unrealized Gain (Loss) Included in Net Income (or Changes in Net Assets) Relating to Assets Still Held at the Reporting Date (b)	21.9			—			—			—			—			—
Realized and Unrealized Gains (Losses) Included in Other Comprehensive Income	1.3			—			—			—			—			—
Purchases, Issuances and Settlements (d)	(42.7		)	(27.7		)	(4.6		)	1.4			0.5			(4.9		)
Transfers out of Level 3 (f) (g)	10.9			0.1			0.1			—			—			—
Changes in Fair Value Allocated to Regulated Jurisdictions (h)	(20.5		)	3.2			1.4			(27.6		)	0.3			0.2
Balance as of March 31, 2016	$	141.3		$	2.6		$	3.7		$	(10.9	)	$	0.6		$	0.7

Three Months Ended March 31, 2015	AEP			APCo			I&M			OPCo			PSO			SWEPCo
	(in millions)
Balance as of December 31, 2014	$	150.8		$	15.8		$	14.7		$	48.4		$	(0.3	)	$	(0.5	)
Realized Gain (Loss) Included in Net Income (or Changes in Net Assets) (b) (c)	8.6			2.2			0.1			0.2			(0.3		)	5.8
Unrealized Gain (Loss) Included in Net Income (or Changes in Net Assets) Relating to Assets Still Held at the Reporting Date (b)	5.2			—			—			—			—			—
Realized and Unrealized Gains (Losses) Included in Other Comprehensive Income	(1.9		)	—			—			—			—			—
Purchases, Issuances and Settlements (d)	(38.5		)	(13.4		)	(9.0		)	(6.8		)	0.6			(5.3		)
Transfers into Level 3 (e) (f)	15.3			—			—			—			—			—
Transfers out of Level 3 (f) (g)	(12.4		)	—			—			—			—			—
Changes in Fair Value Allocated to Regulated Jurisdictions (h)	3.5			1.4			(0.2		)	4.1			(0.7		)	(1.2		)
Balance as of March 31, 2015	$	130.6		$	6.0		$	5.6		$	45.9		$	(0.7	)	$	(1.2	)

(a) Includes both affiliated and nonaffiliated transactions.

(b) Included in revenues on the condensed statements of income.

(c) Represents the change in fair value between the beginning of the reporting period and the settlement of the risk management commodity contract.

(d) Represents the settlement of risk management commodity contracts for the reporting period.

(e) Represents existing assets or liabilities that were previously categorized as Level 2.

(f) Transfers are recognized based on their value at the beginning of the reporting period that the transfer occurred.

(g) Represents existing assets or liabilities that were previously categorized as Level 3.

(h) Relates to the net gains (losses) of those contracts that are not reflected on the condensed statements of income.  These net gains (losses) are recorded as regulatory liabilities/assets.

The following tables quantify the significant unobservable inputs used in developing the fair value of Level 3 positions as of March 31, 2016 and December 31, 2015:

Significant Unobservable Inputs

March 31, 2016

AEP

						Significant	Input/Range
	Fair Value				Valuation	Unobservable						Weighted
	Assets		Liabilities		Technique	Input	Low			High		Average
	(in millions)
Energy Contracts	$	207.6	$	59.5	Discounted Cash Flow	Forward Market Price (a)	$	8.77		$	162.36	$	45.45
						Counterparty Credit Risk (b)	251			669		NA
FTRs	2.3		9.1		Discounted Cash Flow	Forward Market Price (a)	$	(17.72	)	$	10.50	$	0.60
Total	$	209.9	$	68.6

Significant Unobservable Inputs

December 31, 2015

AEP

						Significant	Input/Range
	Fair Value				Valuation	Unobservable						Weighted
	Assets		Liabilities		Technique	Input	Low			High		Average
	(in millions)
Energy Contracts	$	212.3	$	70.3	Discounted Cash Flow	Forward Market Price (a)	$	9.69		$	165.36	$	36.35
						Counterparty Credit Risk (b)	670
FTRs	8.4		3.5		Discounted Cash Flow	Forward Market Price (a)	$	(6.99	)	$	10.34	$	1.10
Total	$	220.7	$	73.8

Significant Unobservable Inputs

March 31, 2016

APCo

						Significant	Forward Price Range
	Fair Value				Valuation	Unobservable					Weighted
	Assets		Liabilities		Technique	Input (a)	Low		High		Average
	(in millions)
Energy Contracts	$	8.2	$	0.1	Discounted Cash Flow	Forward Market Price	$	8.77	$	47.05	$	29.14
FTRs	—		5.5		Discounted Cash Flow	Forward Market Price	0.42		5.58		1.90
Total	$	8.2	$	5.6

Significant Unobservable Inputs

December 31, 2015

APCo

						Significant	Forward Price Range
	Fair Value				Valuation	Unobservable						Weighted
	Assets		Liabilities		Technique	Input (a)	Low			High		Average
	(in millions)
Energy Contracts	$	7.9	$	0.2	Discounted Cash Flow	Forward Market Price	$	12.61		$	47.24	$	32.38
FTRs	4.3		0.3		Discounted Cash Flow	Forward Market Price	(6.96		)	8.43		1.34
Total	$	12.2	$	0.5

Significant Unobservable Inputs

March 31, 2016

I&M

						Significant	Forward Price Range
	Fair Value				Valuation	Unobservable						Weighted
	Assets		Liabilities		Technique	Input (a)	Low			High		Average
	(in millions)
Energy Contracts	$	5.5	$	0.1	Discounted Cash Flow	Forward Market Price	$	8.77		$	47.05	$	29.14
FTRs	—		1.7		Discounted Cash Flow	Forward Market Price	(0.07		)	5.58		0.42
Total	$	5.5	$	1.8

Significant Unobservable Inputs

December 31, 2015

I&M

						Significant	Forward Price Range
	Fair Value				Valuation	Unobservable						Weighted
	Assets		Liabilities		Technique	Input (a)	Low			High		Average
	(in millions)
Energy Contracts	$	6.0	$	0.2	Discounted Cash Flow	Forward Market Price	$	12.61		$	47.24	$	32.38
FTRs	0.3		1.8		Discounted Cash Flow	Forward Market Price	(6.96		)	8.43		1.34
Total	$	6.3	$	2.0

Significant Unobservable Inputs

March 31, 2016

OPCo

						Significant	Forward Price Range
	Fair Value				Valuation	Unobservable					Weighted
	Assets		Liabilities		Technique	Input	Low		High		Average
	(in millions)
Energy Contracts	$	—	$	10.9	Discounted Cash Flow	Forward Market Price (a)	$	36.41	$	162.36	$	84.24
						Counterparty Credit Risk (b)	251
Total	$	—	$	10.9

Significant Unobservable Inputs

December 31, 2015

OPCo

Significant

Forward Price Range

Fair Value

Valuation

Unobservable

Weighted

Assets

Liabilities

Technique

Input (a)

Low

High

Average

(in millions)

Energy Contracts

$

16.0

$

0.1

Discounted Cash Flow

Forward Market Price

$

41.61

$

165.36

$

86.84

Significant Unobservable Inputs

March 31, 2016

PSO

						Significant	Forward Price Range
	Fair Value				Valuation	Unobservable						Weighted
	Assets		Liabilities		Technique	Input (a)	Low			High		Average
	(in millions)
FTRs	$	0.7	$	0.1	Discounted Cash Flow	Forward Market Price	$	(17.72	)	$	1.80	$	(0.59	)

Significant Unobservable Inputs

December 31, 2015

PSO

Significant

Forward Price Range

Fair Value

Valuation

Unobservable

Weighted

Assets

Liabilities

Technique

Input (a)

Low

High

Average

(in millions)

FTRs

$

0.7

$

0.1

Discounted Cash Flow

Forward Market Price

$

(6.96

)

$

8.43

$

1.34

Significant Unobservable Inputs

March 31, 2016

SWEPCo

						Significant	Forward Price Range
	Fair Value				Valuation	Unobservable						Weighted
	Assets		Liabilities		Technique	Input (a)	Low			High		Average
	(in millions)
FTRs	$	0.8	$	0.1	Discounted Cash Flow	Forward Market Price	$	(17.72	)	$	1.80	$	(0.59	)

Significant Unobservable Inputs

December 31, 2015

SWEPCo

Significant

Forward Price Range

Fair Value

Valuation

Unobservable

Weighted

Assets

Liabilities

Technique

Input (a)

Low

High

Average

(in millions)

FTRs

$

0.9

$

0.1

Discounted Cash Flow

Forward Market Price

$

(6.96

)

$

8.43

$

1.34

(a) Represents market prices in dollars per MWh.

(b) Represents average price of credit default swaps used to calculate counterparty credit risk, reported in basis points.

NA    Not applicable.

The following table provides sensitivity of fair value measurements to increases (decreases) in significant unobservable inputs related to Energy Contracts and FTRs for the Registrants as of March 31, 2016 and December 31, 2015:

Sensitivity of Fair Value Measurements

Significant Unobservable Input	Position	Change in Input	Impact on Fair Value Measurement
Forward Market Price	Buy	Increase (Decrease)	Higher (Lower)
Forward Market Price	Sell	Increase (Decrease)	Lower (Higher)
Counterparty Credit Risk	Loss	Increase (Decrease)	Higher (Lower)
Counterparty Credit Risk	Gain	Increase (Decrease)	Lower (Higher)

Public Service Co Of Oklahoma [Member]

Fair Value Measurements

FAIR VALUE MEASUREMENTS

The disclosures in this note apply to all Registrants unless indicated otherwise.

Fair Value Hierarchy and Valuation Techniques

The accounting guidance for “Fair Value Measurements and Disclosures” establishes a fair value hierarchy that prioritizes the inputs used to measure fair value.  The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurement) and the lowest priority to unobservable inputs (Level 3 measurement).  Where observable inputs are available for substantially the full term of the asset or liability, the instrument is categorized in Level 2.  When quoted market prices are not available, pricing may be completed using comparable securities, dealer values, operating data and general market conditions to determine fair value.  Valuation models utilize various inputs such as commodity, interest rate and, to a lesser degree, volatility and credit that include quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in inactive markets, market corroborated inputs (i.e. inputs derived principally from, or correlated to, observable market data) and other observable inputs for the asset or liability.  The amount of risk taken is determined by the Commercial Operations, Energy Supply and Finance groups in accordance with established risk management policies as approved by the Finance Committee of AEP’s Board of Directors. AEPSC’s market risk oversight staff independently monitors risk policies, procedures and risk levels and provides members of the Commercial Operations Risk Committee (Regulated Risk Committee) and the Energy Supply Risk Committee (Competitive Risk Committee) various reports regarding compliance with policies, limits and procedures. The Regulated Risk Committee consists of AEPSC’s Chief Operating Officer, Chief Financial Officer, Executive Vice President of Generation, Senior Vice President of Commercial Operations and Chief Risk Officer. The Competitive Risk Committee consists of AEPSC’s Chief Operating Officer, Chief Financial Officer and Chief Risk Officer in addition to Energy Supply’s President and Vice President.

For commercial activities, exchange traded derivatives, namely futures contracts, are generally fair valued based on unadjusted quoted prices in active markets and are classified as Level 1.  Level 2 inputs primarily consist of OTC broker quotes in moderately active or less active markets, as well as exchange traded contracts where there is insufficient market liquidity to warrant inclusion in Level 1.  Management verifies price curves using these broker quotes and classifies these fair values within Level 2 when substantially all of the fair value can be corroborated.  Management typically obtains multiple broker quotes, which are nonbinding in nature but are based on recent trades in the marketplace.  When multiple broker quotes are obtained, the quoted bid and ask prices are averaged.  In certain circumstances, a broker quote may be discarded if it is a clear outlier.  Management uses a historical correlation analysis between the broker quoted location and the illiquid locations.  If the points are highly correlated, these locations are included within Level 2 as well.  Certain OTC and bilaterally executed derivative instruments are executed in less active markets with a lower availability of pricing information.  Illiquid transactions, complex structured transactions, FTRs and counterparty credit risk may require nonmarket based inputs.  Some of these inputs may be internally developed or extrapolated and utilized to estimate fair value.  When such inputs have a significant impact on the measurement of fair value, the instrument is categorized as Level 3.  The main driver of contracts being classified as Level 3 is the inability to substantiate energy price curves in the market.  A portion of the Level 3 instruments have been economically hedged which limits potential earnings volatility.

AEP utilizes its trustee’s external pricing service to estimate the fair value of the underlying investments held in the nuclear trusts.  AEP’s investment managers review and validate the prices utilized by the trustee to determine fair value.  AEP’s management performs its own valuation testing to verify the fair values of the securities.  AEP receives audit reports of the trustee’s operating controls and valuation processes.  The trustee uses multiple pricing vendors for the assets held in the trusts.

Assets in the nuclear trusts, Cash and Cash Equivalents, Other Temporary Investments and Restricted Cash for Securitized Funding are classified using the following methods.  Equities are classified as Level 1 holdings if they are actively traded on exchanges.  Items classified as Level 1 are investments in money market funds, fixed income and equity mutual funds and domestic equity securities.  They are valued based on observable inputs, primarily unadjusted quoted prices in active markets for identical assets.  Items classified as Level 2 are primarily investments in individual fixed income securities and cash equivalent funds.  Fixed income securities generally do not trade on exchanges and do not have an official closing price but their valuation inputs are based on observable market data.  Pricing vendors calculate bond valuations using financial models and matrices.  The models use observable inputs including yields on benchmark securities, quotes by securities brokers, rating agency actions, discounts or premiums on securities compared to par prices, changes in yields for U.S. Treasury securities, corporate actions by bond issuers, prepayment schedules and histories, economic events and, for certain securities, adjustments to yields to reflect changes in the rate of inflation.  Other securities with model-derived valuation inputs that are observable are also classified as Level 2 investments.  Investments with unobservable valuation inputs are classified as Level 3 investments.

Fair Value Measurements of Long-term Debt

The fair values of Long-term Debt are based on quoted market prices, without credit enhancements, for the same or similar issues and the current interest rates offered for instruments with similar maturities classified as Level 2 measurement inputs.  These instruments are not marked-to-market.  The estimates presented are not necessarily indicative of the amounts that could be realized in a current market exchange.

The book values and fair values of Long-term Debt for the Registrants as of March 31, 2016 and December 31, 2015 are summarized in the following table:

	March 31, 2016				December 31, 2015
Company	Book Value		Fair Value		Book Value		Fair Value
	(in millions)
AEP	$	19,782.6	$	22,052.8	$	19,572.7	$	21,201.3
APCo	3,919.3		4,597.8		3,930.7		4,416.7
I&M	2,366.6		2,595.4		2,000.0		2,193.6
OPCo	2,135.5		2,515.4		2,157.7		2,472.7
PSO	1,286.3		1,463.6		1,286.1		1,402.9
SWEPCo	2,272.4		2,483.4		2,273.5		2,417.2

Fair Value Measurements of Other Temporary Investments (Applies to AEP)

Other Temporary Investments include funds held by trustees primarily for the payment of securitization bonds and securities available for sale, including marketable securities that management intends to hold for less than one year and investments by its protected cell of EIS.

The following is a summary of Other Temporary Investments:

	March 31, 2016
Other Temporary Investments	Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
	(in millions)
Restricted Cash (a)	$	147.4	$	—	$	—	$	147.4
Fixed Income Securities – Mutual Funds	91.4		0.1		—		91.5
Equity Securities – Mutual Funds	13.9		11.7		—		25.6
Total Other Temporary Investments	$	252.7	$	11.8	$	—	$	264.5

	December 31, 2015
Other Temporary Investments	Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	(in millions)
Restricted Cash (a)	$	271.0	$	—	$	—		$	271.0
Fixed Income Securities – Mutual Funds	91.1		—		(0.7		)	90.4
Equity Securities – Mutual Funds	13.7		11.7		—			25.4
Total Other Temporary Investments	$	375.8	$	11.7	$	(0.7	)	$	386.8

(a) Primarily represents amounts held for the repayment of debt.

The following table provides the activity for fixed income and equity securities within Other Temporary Investments for the three months ended March 31, 2016 and 2015:

	Three Months Ended March 31,
	2016		2015
	(in millions)
Proceeds from Investment Sales	$	—	$	—
Purchases of Investments	0.4		0.4
Gross Realized Gains on Investment Sales	—		—
Gross Realized Losses on Investment Sales	—		—

As of March 31, 2016 and December 31, 2015, AEP had no Other Temporary Investments with an unrealized loss position.  As of March 31, 2016, fixed income securities were primarily debt based mutual funds with short and intermediate maturities.  Mutual funds may be sold and do not contain maturity dates.

For details of the reasons for changes in Securities Available for Sale included in Accumulated Other Comprehensive Income (Loss) for the three months ended March 31, 2016 and 2015, see Note 3.

Fair Value Measurements of Trust Assets for Decommissioning and SNF Disposal (Applies to AEP and I&M)

Nuclear decommissioning and spent nuclear fuel trust funds represent funds that regulatory commissions allow I&M to collect through rates to fund future decommissioning and spent nuclear fuel disposal liabilities.  By rules or orders, the IURC, the MPSC and the FERC established investment limitations and general risk management guidelines.  In general, limitations include:

• Acceptable investments (rated investment grade or above when purchased).

• Maximum percentage invested in a specific type of investment.

• Prohibition of investment in obligations of AEP, I&M or their affiliates.

• Withdrawals permitted only for payment of decommissioning costs and trust expenses.

I&M maintains trust records for each regulatory jurisdiction.  Regulatory approval is required to withdraw decommissioning funds. These funds are managed by external investment managers who must comply with the guidelines and rules of the applicable regulatory authorities.  The trust assets are invested to optimize the net of tax earnings of the trust giving consideration to liquidity, risk, diversification and other prudent investment objectives.

I&M records securities held in these trust funds in Spent Nuclear Fuel and Decommissioning Trusts on its balance sheets. I&M records these securities at fair value.  I&M classifies securities in the trust funds as available-for-sale due to their long-term purpose.  Other-than-temporary impairments for investments in both debt and equity securities are considered realized losses as a result of securities being managed by an external investment management firm.  The external investment management firm makes specific investment decisions regarding the debt and equity investments held in these trusts and generally intends to sell debt securities in an unrealized loss position as part of a tax optimization strategy.  Impairments reduce the cost basis of the securities which will affect any future unrealized gain or realized gain or loss due to the adjusted cost of investment.  I&M records unrealized gains and other-than-temporary impairments from securities in these trust funds as adjustments to the regulatory liability account for the nuclear decommissioning trust funds and to regulatory assets or liabilities for the SNF disposal trust funds in accordance with their treatment in rates.  Consequently, changes in fair value of trust assets do not affect earnings or AOCI.

The following is a summary of nuclear trust fund investments as of March 31, 2016 and December 31, 2015:

	March 31, 2016							December 31, 2015
	Fair Value		Gross Unrealized Gains		Other-Than-Temporary Impairments			Fair Value		Gross Unrealized Gains		Other-Than-Temporary Impairments
	(in millions)
Cash and Cash Equivalents	$	142.0	$	—	$	—		$	168.3	$	—	$	—
Fixed Income Securities:
United States Government	761.1		52.3		(2.1		)	731.1		35.9		(2.6		)
Corporate Debt	68.9		4.9		(1.0		)	57.9		3.2		(1.1		)
State and Local Government	29.0		1.2		(0.3		)	22.2		1.1		(0.3		)
Subtotal Fixed Income Securities	859.0		58.4		(3.4		)	811.2		40.2		(4.0		)
Equity Securities - Domestic	1,151.4		583.5		(78.9		)	1,126.9		571.6		(79.3		)
Spent Nuclear Fuel and Decommissioning Trusts	$	2,152.4	$	641.9	$	(82.3	)	$	2,106.4	$	611.8	$	(83.3	)

The following table provides the securities activity within the decommissioning and SNF trusts for the three months ended March 31, 2016 and 2015:

	Three Months Ended March 31,
	2016		2015
	(in millions)
Proceeds from Investment Sales	$	1,137.7	$	228.2
Purchases of Investments	1,151.6		245.8
Gross Realized Gains on Investment Sales	15.8		11.2
Gross Realized Losses on Investment Sales	7.8		3.8

The adjusted cost of fixed income securities was $801 million and $771 million as of March 31, 2016 and December 31, 2015, respectively.  The adjusted cost of equity securities was $568 million and $555 million as of March 31, 2016 and December 31, 2015, respectively.

The fair value of fixed income securities held in the nuclear trust funds, summarized by contractual maturities, as of March 31, 2016 was as follows:

	Fair Value of Fixed Income Securities
	(in millions)
Within 1 year	$	175.4
1 year – 5 years	369.6
5 years – 10 years	133.0
After 10 years	181.0
Total	$	859.0

Fair Value Measurements of Financial Assets and Liabilities

The following tables set forth, by level within the fair value hierarchy, the Registrants’ financial assets and liabilities that were accounted for at fair value on a recurring basis as of March 31, 2016 and December 31, 2015.  As required by the accounting guidance for “Fair Value Measurements and Disclosures,” financial assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement.  Management’s assessment of the significance of a particular input to the fair value measurement requires judgment and may affect the valuation of fair value assets and liabilities and their placement within the fair value hierarchy levels.  There have not been any significant changes in management’s valuation techniques.

AEP

Assets and Liabilities Measured at Fair Value on a Recurring Basis

March 31, 2016

	Level 1		Level 2		Level 3		Other			Total
Assets:	(in millions)
Cash and Cash Equivalents (a)	$	9.6	$	4.4	$	—	$	176.4		$	190.4
Other Temporary Investments
Restricted Cash (a)	129.2		7.6		—		10.6			147.4
Fixed Income Securities – Mutual Funds	91.5		—		—		—			91.5
Equity Securities – Mutual Funds (b)	25.6		—		—		—			25.6
TotalOther Temporary Investments	246.3		7.6		—		10.6			264.5
Risk Management Assets
Risk Management Commodity Contracts (c) (d)	10.7		585.5		201.8		(346.0		)	452.0
Cash Flow Hedges:
Commodity Hedges (c)	—		11.4		8.1		0.3			19.8
Fair Value Hedges	—		0.5		—		0.4			0.9
Total Risk Management Assets	10.7		597.4		209.9		(345.3		)	472.7
Spent Nuclear Fuel and Decommissioning Trusts
Cash and Cash Equivalents (e)	135.3		—		—		6.7			142.0
Fixed Income Securities:
United States Government	—		761.1		—		—			761.1
Corporate Debt	—		68.9		—		—			68.9
State and Local Government	—		29.0		—		—			29.0
Subtotal Fixed Income Securities	—		859.0		—		—			859.0
Equity Securities – Domestic (b)	1,151.4		—		—		—			1,151.4
TotalSpent Nuclear Fuel and Decommissioning Trusts	1,286.7		859.0		—		6.7			2,152.4
Total Assets	$	1,553.3	$	1,468.4	$	209.9	$	(151.6	)	$	3,080.0
Liabilities:
Risk Management Liabilities
Risk Management Commodity Contracts (c) (d)	$	20.5	$	569.2	$	58.5	$	(377.2	)	$	271.0
Cash Flow Hedges:
Commodity Hedges (c)	—		29.7		10.1		0.3			40.1
Interest Rate/Foreign Currency Hedges	—		0.4		—		—			0.4
Fair Value Hedges	—		—		—		0.4			0.4
Total Risk Management Liabilities	$	20.5	$	599.3	$	68.6	$	(376.5	)	$	311.9

AEP

Assets and Liabilities Measured at Fair Value on a Recurring Basis

December 31, 2015

	Level 1		Level 2		Level 3		Other			Total
Assets:	(in millions)
Cash and Cash Equivalents (a)	$	3.9	$	4.3	$	—	$	168.2		$	176.4
Other Temporary Investments
Restricted Cash (a)	230.0		7.7		—		33.3			271.0
Fixed Income Securities – Mutual Funds	90.4		—		—		—			90.4
Equity Securities – Mutual Funds (b)	25.4		—		—		—			25.4
TotalOther Temporary Investments	345.8		7.7		—		33.3			386.8
Risk Management Assets
Risk Management Commodity Contracts (c) (f)	11.5		495.0		219.7		(287.7		)	438.5
Cash Flow Hedges:
Commodity Hedges (c)	—		15.9		1.0		0.7			17.6
Fair Value Hedges	—		—		—		0.1			0.1
Total Risk Management Assets	11.5		510.9		220.7		(286.9		)	456.2
Spent Nuclear Fuel and Decommissioning Trusts
Cash and Cash Equivalents (e)	160.5		—		—		7.8			168.3
Fixed Income Securities:
United States Government	—		731.1		—		—			731.1
Corporate Debt	—		57.9		—		—			57.9
State and Local Government	—		22.2		—		—			22.2
Subtotal Fixed Income Securities	—		811.2		—		—			811.2
Equity Securities – Domestic (b)	1,126.9		—		—		—			1,126.9
TotalSpent Nuclear Fuel and Decommissioning Trusts	1,287.4		811.2		—		7.8			2,106.4
Total Assets	$	1,648.6	$	1,334.1	$	220.7	$	(77.6	)	$	3,125.8
Liabilities:
Risk Management Liabilities
Risk Management Commodity Contracts (c) (f)	$	24.1	$	471.5	$	67.3	$	(326.3	)	$	236.6
Cash Flow Hedges:
Commodity Hedges (c)	—		18.9		6.5		0.7			26.1
Interest Rate/Foreign Currency Hedges	—		0.4		—		—			0.4
Fair Value Hedges	—		3.0		—		0.1			3.1
Total Risk Management Liabilities	$	24.1	$	493.8	$	73.8	$	(325.5	)	$	266.2

APCo

Assets and Liabilities Measured at Fair Value on a Recurring Basis

March 31, 2016

	Level 1		Level 2		Level 3		Other			Total
Assets:	(in millions)
Restricted Cash for Securitized Funding (a)	$	7.5	$	—	$	—	$	0.1		$	7.6
Risk Management Assets - Nonaffiliated and Affiliated
Risk Management Commodity Contracts (c) (g)	0.2		16.2		8.2		(12.4		)	12.2
Total Assets:	$	7.7	$	16.2	$	8.2	$	(12.3	)	$	19.8
Liabilities:
Risk Management Liabilities - Nonaffiliated
Risk Management Commodity Contracts (c) (g)	$	0.2	$	17.7	$	5.6	$	(13.0	)	$	10.5

APCo

Assets and Liabilities Measured at Fair Value on a Recurring Basis

December 31, 2015

	Level 1		Level 2		Level 3		Other			Total
Assets:	(in millions)
Restricted Cash for Securitized Funding (a)	$	14.8	$	—	$	—	$	0.1		$	14.9
Risk Management Assets - Nonaffiliated and Affiliated
Risk Management Commodity Contracts (c) (g)	0.2		13.9		12.2		(10.6		)	15.7
Total Assets:	$	15.0	$	13.9	$	12.2	$	(10.5	)	$	30.6
Liabilities:
Risk Management Liabilities - Nonaffiliated
Risk Management Commodity Contracts (c) (g)	$	0.2	$	17.8	$	0.5	$	(13.6	)	$	4.9

I&M

Assets and Liabilities Measured at Fair Value on a Recurring Basis

March 31, 2016

	Level 1		Level 2		Level 3		Other			Total
Assets:	(in millions)
Risk Management Assets - Nonaffiliated and Affiliated
Risk Management Commodity Contracts (c) (g)	$	0.1	$	12.5	$	5.5	$	(8.6	)	$	9.5
Spent Nuclear Fuel and Decommissioning Trusts
Cash and Cash Equivalents (e)	135.3		—		—		6.7			142.0
Fixed Income Securities:
United States Government	—		761.1		—		—			761.1
Corporate Debt	—		68.9		—		—			68.9
State and Local Government	—		29.0		—		—			29.0
Subtotal Fixed Income Securities	—		859.0		—		—			859.0
Equity Securities - Domestic (b)	1,151.4		—		—		—			1,151.4
TotalSpent Nuclear Fuel and Decommissioning Trusts	1,286.7		859.0		—		6.7			2,152.4
Total Assets	$	1,286.8	$	871.5	$	5.5	$	(1.9	)	$	2,161.9
Liabilities:
Risk Management Liabilities - Nonaffiliated
Risk Management Commodity Contracts (c) (g)	$	0.1	$	14.2	$	1.8	$	(8.7	)	$	7.4

I&M

Assets and Liabilities Measured at Fair Value on a Recurring Basis

December 31, 2015

	Level 1		Level 2		Level 3		Other			Total
Assets:	(in millions)
Risk Management Assets - Nonaffiliated and Affiliated
Risk Management Commodity Contracts (c) (g)	$	0.1	$	17.0	$	6.3	$	(11.1	)	$	12.3
Spent Nuclear Fuel and Decommissioning Trusts
Cash and Cash Equivalents (e)	160.5		—		—		7.8			168.3
Fixed Income Securities:
United States Government	—		731.1		—		—			731.1
Corporate Debt	—		57.9		—		—			57.9
State and Local Government	—		22.2		—		—			22.2
Subtotal Fixed Income Securities	—		811.2		—		—			811.2
Equity Securities - Domestic (b)	1,126.9		—		—		—			1,126.9
TotalSpent Nuclear Fuel and Decommissioning Trusts	1,287.4		811.2		—		7.8			2,106.4
Total Assets	$	1,287.5	$	828.2	$	6.3	$	(3.3	)	$	2,118.7
Liabilities:
Risk Management Liabilities - Nonaffiliated
Risk Management Commodity Contracts (c) (g)	$	0.1	$	17.5	$	2.0	$	(11.7	)	$	7.9

OPCo

Assets and Liabilities Measured at Fair Value on a Recurring Basis

March 31, 2016

	Level 1		Level 2		Level 3		Other			Total
Assets:	(in millions)
Restricted Cash for Securitized Funding (a)	$	16.2	$	—	$	—	$	—		$	16.2
Liabilities:
Risk Management Liabilities
Risk Management Commodity Contracts (c) (g)	$	—	$	0.6	$	10.9	$	(0.2	)	$	11.3

OPCo

Assets and Liabilities Measured at Fair Value on a Recurring Basis

December 31, 2015

	Level 1		Level 2		Level 3		Other		Total
Assets:	(in millions)
Restricted Cash for Securitized Funding (a)	$	—	$	—	$	—	$	27.7	$	27.7
Risk Management Assets
Risk Management Commodity Contracts (c) (g)	—		—		16.0		3.2		19.2
Total Assets	$	—	$	—	$	16.0	$	30.9	$	46.9
Liabilities:
Risk Management Liabilities
Risk Management Commodity Contracts (c) (g)	$	—	$	0.8	$	0.1	$	2.7	$	3.6

PSO

Assets and Liabilities Measured at Fair Value on a Recurring Basis

March 31, 2016

	Level 1		Level 2		Level 3		Other			Total
Assets:	(in millions)
Risk Management Assets
Risk Management Commodity Contracts (c) (g)	$	—	$	0.1	$	0.7	$	(0.1	)	$	0.7
Liabilities:
Risk Management Liabilities
Risk Management Commodity Contracts (c) (g)	$	—	$	0.3	$	0.1	$	(0.2	)	$	0.2

PSO

Assets and Liabilities Measured at Fair Value on a Recurring Basis

December 31, 2015

	Level 1		Level 2		Level 3		Other			Total
Assets:	(in millions)
Risk Management Assets
Risk Management Commodity Contracts (c) (g)	$	—	$	—	$	0.7	$	(0.1	)	$	0.6
Liabilities:
Risk Management Liabilities
Risk Management Commodity Contracts (c) (g)	$	—	$	0.5	$	0.1	$	(0.4	)	$	0.2

SWEPCo

Assets and Liabilities Measured at Fair Value on a Recurring Basis

March 31, 2016

	Level 1		Level 2		Level 3		Other			Total
Assets:	(in millions)
Cash and Cash Equivalents (a)	$	9.4	$	—	$	—	$	2.9		$	12.3
Risk Management Assets
Risk Management Commodity Contracts (c) (g)	—		0.1		0.8		(0.1		)	0.8
Total Assets	$	9.4	$	0.1	$	0.8	$	2.8		$	13.1
Liabilities:
Risk Management Liabilities
Risk Management Commodity Contracts (c) (g)	$	—	$	5.5	$	0.1	$	(0.3	)	$	5.3

SWEPCo

Assets and Liabilities Measured at Fair Value on a Recurring Basis

December 31, 2015

	Level 1		Level 2		Level 3		Other			Total
Assets:	(in millions)
Cash and Cash Equivalents (a)	$	3.6	$	—	$	—	$	1.6		$	5.2
Risk Management Assets
Risk Management Commodity Contracts (c) (g)	—		—		0.9		(0.1		)	0.8
Total Assets	$	3.6	$	—	$	0.9	$	1.5		$	6.0
Liabilities:
Risk Management Liabilities
Risk Management Commodity Contracts (c) (g)	$	—	$	5.5	$	0.1	$	(0.4	)	$	5.2

(a) Amounts in “Other’’ column primarily represent cash deposits in bank accounts with financial institutions or with third parties.  Level 1 and Level 2 amounts primarily represent investments in money market funds.

(b) Amounts represent publicly traded equity securities and equity-based mutual funds.

(c) Amounts in “Other’’ column primarily represent counterparty netting of risk management and hedging contracts and associated cash collateral under the accounting guidance for “Derivatives and Hedging.’’

(d) The March 31, 2016 maturity of the net fair value of risk management contracts prior to cash collateral, assets/(liabilities), is as follows:  Level 1 matures $(5) million in 2016 and $(5) million in periods 2017-2019;  Level 2 matures $3 million in 2016, $9 million in periods 2017-2019, $3 million in periods 2020-2021 and $1 million in periods 2022-2032;  Level 3 matures $17 million in 2016, $37 million in periods 2017-2019, $21 million in periods 2020-2021 and $69 million in periods 2022-2032.  Risk management commodity contracts are substantially comprised of power contracts.

(e) Amounts in “Other’’ column primarily represent accrued interest receivables from financial institutions.  Level 1 amounts primarily represent investments in money market funds.

(f) The December 31, 2015 maturity of the net fair value of risk management contracts prior to cash collateral, assets/(liabilities), is as follows:  Level 1 matures $(9) million in 2016 and $(4) million in periods 2017-2019;  Level 2 matures $2 million in 2016, $18 million in periods 2017-2019 and $4 million in periods 2020-2021; Level 3 matures $28 million in 2016, $29 million in periods 2017-2019, $19 million in periods 2020-2021 and $76 million in periods 2022-2032.  Risk management commodity contracts are substantially comprised of power contracts.

(g) Substantially comprised of power contracts for APCo, I&M and OPCo and coal contracts for PSO and SWEPCo.

There were no transfers between Level 1 and Level 2 during the three months ended March 31, 2016 and 2015.

The following tables set forth a reconciliation of changes in the fair value of net trading derivatives classified as Level 3 in the fair value hierarchy:

Three Months Ended March 31, 2016	AEP			APCo (a)			I&M (a)			OPCo			PSO			SWEPCo
	(in millions)
Balance as of December 31, 2015	$	146.9		$	11.7		$	4.3		$	15.9		$	0.6		$	0.8
Realized Gain (Loss) Included in Net Income (or Changes in Net Assets) (b) (c)	23.5			15.3			2.5			(0.6		)	(0.8		)	4.6
Unrealized Gain (Loss) Included in Net Income (or Changes in Net Assets) Relating to Assets Still Held at the Reporting Date (b)	21.9			—			—			—			—			—
Realized and Unrealized Gains (Losses) Included in Other Comprehensive Income	1.3			—			—			—			—			—
Purchases, Issuances and Settlements (d)	(42.7		)	(27.7		)	(4.6		)	1.4			0.5			(4.9		)
Transfers out of Level 3 (f) (g)	10.9			0.1			0.1			—			—			—
Changes in Fair Value Allocated to Regulated Jurisdictions (h)	(20.5		)	3.2			1.4			(27.6		)	0.3			0.2
Balance as of March 31, 2016	$	141.3		$	2.6		$	3.7		$	(10.9	)	$	0.6		$	0.7

Three Months Ended March 31, 2015	AEP			APCo			I&M			OPCo			PSO			SWEPCo
	(in millions)
Balance as of December 31, 2014	$	150.8		$	15.8		$	14.7		$	48.4		$	(0.3	)	$	(0.5	)
Realized Gain (Loss) Included in Net Income (or Changes in Net Assets) (b) (c)	8.6			2.2			0.1			0.2			(0.3		)	5.8
Unrealized Gain (Loss) Included in Net Income (or Changes in Net Assets) Relating to Assets Still Held at the Reporting Date (b)	5.2			—			—			—			—			—
Realized and Unrealized Gains (Losses) Included in Other Comprehensive Income	(1.9		)	—			—			—			—			—
Purchases, Issuances and Settlements (d)	(38.5		)	(13.4		)	(9.0		)	(6.8		)	0.6			(5.3		)
Transfers into Level 3 (e) (f)	15.3			—			—			—			—			—
Transfers out of Level 3 (f) (g)	(12.4		)	—			—			—			—			—
Changes in Fair Value Allocated to Regulated Jurisdictions (h)	3.5			1.4			(0.2		)	4.1			(0.7		)	(1.2		)
Balance as of March 31, 2015	$	130.6		$	6.0		$	5.6		$	45.9		$	(0.7	)	$	(1.2	)

(a) Includes both affiliated and nonaffiliated transactions.

(b) Included in revenues on the condensed statements of income.

(c) Represents the change in fair value between the beginning of the reporting period and the settlement of the risk management commodity contract.

(d) Represents the settlement of risk management commodity contracts for the reporting period.

(e) Represents existing assets or liabilities that were previously categorized as Level 2.

(f) Transfers are recognized based on their value at the beginning of the reporting period that the transfer occurred.

(g) Represents existing assets or liabilities that were previously categorized as Level 3.

(h) Relates to the net gains (losses) of those contracts that are not reflected on the condensed statements of income.  These net gains (losses) are recorded as regulatory liabilities/assets.

The following tables quantify the significant unobservable inputs used in developing the fair value of Level 3 positions as of March 31, 2016 and December 31, 2015:

Significant Unobservable Inputs

March 31, 2016

AEP

						Significant	Input/Range
	Fair Value				Valuation	Unobservable						Weighted
	Assets		Liabilities		Technique	Input	Low			High		Average
	(in millions)
Energy Contracts	$	207.6	$	59.5	Discounted Cash Flow	Forward Market Price (a)	$	8.77		$	162.36	$	45.45
						Counterparty Credit Risk (b)	251			669		NA
FTRs	2.3		9.1		Discounted Cash Flow	Forward Market Price (a)	$	(17.72	)	$	10.50	$	0.60
Total	$	209.9	$	68.6

Significant Unobservable Inputs

December 31, 2015

AEP

						Significant	Input/Range
	Fair Value				Valuation	Unobservable						Weighted
	Assets		Liabilities		Technique	Input	Low			High		Average
	(in millions)
Energy Contracts	$	212.3	$	70.3	Discounted Cash Flow	Forward Market Price (a)	$	9.69		$	165.36	$	36.35
						Counterparty Credit Risk (b)	670
FTRs	8.4		3.5		Discounted Cash Flow	Forward Market Price (a)	$	(6.99	)	$	10.34	$	1.10
Total	$	220.7	$	73.8

Significant Unobservable Inputs

March 31, 2016

APCo

						Significant	Forward Price Range
	Fair Value				Valuation	Unobservable					Weighted
	Assets		Liabilities		Technique	Input (a)	Low		High		Average
	(in millions)
Energy Contracts	$	8.2	$	0.1	Discounted Cash Flow	Forward Market Price	$	8.77	$	47.05	$	29.14
FTRs	—		5.5		Discounted Cash Flow	Forward Market Price	0.42		5.58		1.90
Total	$	8.2	$	5.6

Significant Unobservable Inputs

December 31, 2015

APCo

						Significant	Forward Price Range
	Fair Value				Valuation	Unobservable						Weighted
	Assets		Liabilities		Technique	Input (a)	Low			High		Average
	(in millions)
Energy Contracts	$	7.9	$	0.2	Discounted Cash Flow	Forward Market Price	$	12.61		$	47.24	$	32.38
FTRs	4.3		0.3		Discounted Cash Flow	Forward Market Price	(6.96		)	8.43		1.34
Total	$	12.2	$	0.5

Significant Unobservable Inputs

March 31, 2016

I&M

						Significant	Forward Price Range
	Fair Value				Valuation	Unobservable						Weighted
	Assets		Liabilities		Technique	Input (a)	Low			High		Average
	(in millions)
Energy Contracts	$	5.5	$	0.1	Discounted Cash Flow	Forward Market Price	$	8.77		$	47.05	$	29.14
FTRs	—		1.7		Discounted Cash Flow	Forward Market Price	(0.07		)	5.58		0.42
Total	$	5.5	$	1.8

Significant Unobservable Inputs

December 31, 2015

I&M

						Significant	Forward Price Range
	Fair Value				Valuation	Unobservable						Weighted
	Assets		Liabilities		Technique	Input (a)	Low			High		Average
	(in millions)
Energy Contracts	$	6.0	$	0.2	Discounted Cash Flow	Forward Market Price	$	12.61		$	47.24	$	32.38
FTRs	0.3		1.8		Discounted Cash Flow	Forward Market Price	(6.96		)	8.43		1.34
Total	$	6.3	$	2.0

Significant Unobservable Inputs

March 31, 2016

OPCo

						Significant	Forward Price Range
	Fair Value				Valuation	Unobservable					Weighted
	Assets		Liabilities		Technique	Input	Low		High		Average
	(in millions)
Energy Contracts	$	—	$	10.9	Discounted Cash Flow	Forward Market Price (a)	$	36.41	$	162.36	$	84.24
						Counterparty Credit Risk (b)	251
Total	$	—	$	10.9

Significant Unobservable Inputs

December 31, 2015

OPCo

Significant

Forward Price Range

Fair Value

Valuation

Unobservable

Weighted

Assets

Liabilities

Technique

Input (a)

Low

High

Average

(in millions)

Energy Contracts

$

16.0

$

0.1

Discounted Cash Flow

Forward Market Price

$

41.61

$

165.36

$

86.84

Significant Unobservable Inputs

March 31, 2016

PSO

						Significant	Forward Price Range
	Fair Value				Valuation	Unobservable						Weighted
	Assets		Liabilities		Technique	Input (a)	Low			High		Average
	(in millions)
FTRs	$	0.7	$	0.1	Discounted Cash Flow	Forward Market Price	$	(17.72	)	$	1.80	$	(0.59	)

Significant Unobservable Inputs

December 31, 2015

PSO

Significant

Forward Price Range

Fair Value

Valuation

Unobservable

Weighted

Assets

Liabilities

Technique

Input (a)

Low

High

Average

(in millions)

FTRs

$

0.7

$

0.1

Discounted Cash Flow

Forward Market Price

$

(6.96

)

$

8.43

$

1.34

Significant Unobservable Inputs

March 31, 2016

SWEPCo

						Significant	Forward Price Range
	Fair Value				Valuation	Unobservable						Weighted
	Assets		Liabilities		Technique	Input (a)	Low			High		Average
	(in millions)
FTRs	$	0.8	$	0.1	Discounted Cash Flow	Forward Market Price	$	(17.72	)	$	1.80	$	(0.59	)

Significant Unobservable Inputs

December 31, 2015

SWEPCo

Significant

Forward Price Range

Fair Value

Valuation

Unobservable

Weighted

Assets

Liabilities

Technique

Input (a)

Low

High

Average

(in millions)

FTRs

$

0.9

$

0.1

Discounted Cash Flow

Forward Market Price

$

(6.96

)

$

8.43

$

1.34

(a) Represents market prices in dollars per MWh.

(b) Represents average price of credit default swaps used to calculate counterparty credit risk, reported in basis points.

NA    Not applicable.

The following table provides sensitivity of fair value measurements to increases (decreases) in significant unobservable inputs related to Energy Contracts and FTRs for the Registrants as of March 31, 2016 and December 31, 2015:

Sensitivity of Fair Value Measurements

Significant Unobservable Input	Position	Change in Input	Impact on Fair Value Measurement
Forward Market Price	Buy	Increase (Decrease)	Higher (Lower)
Forward Market Price	Sell	Increase (Decrease)	Lower (Higher)
Counterparty Credit Risk	Loss	Increase (Decrease)	Higher (Lower)
Counterparty Credit Risk	Gain	Increase (Decrease)	Lower (Higher)

Southwestern Electric Power Co [Member]

Fair Value Measurements

FAIR VALUE MEASUREMENTS

The disclosures in this note apply to all Registrants unless indicated otherwise.

Fair Value Hierarchy and Valuation Techniques

The accounting guidance for “Fair Value Measurements and Disclosures” establishes a fair value hierarchy that prioritizes the inputs used to measure fair value.  The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurement) and the lowest priority to unobservable inputs (Level 3 measurement).  Where observable inputs are available for substantially the full term of the asset or liability, the instrument is categorized in Level 2.  When quoted market prices are not available, pricing may be completed using comparable securities, dealer values, operating data and general market conditions to determine fair value.  Valuation models utilize various inputs such as commodity, interest rate and, to a lesser degree, volatility and credit that include quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in inactive markets, market corroborated inputs (i.e. inputs derived principally from, or correlated to, observable market data) and other observable inputs for the asset or liability.  The amount of risk taken is determined by the Commercial Operations, Energy Supply and Finance groups in accordance with established risk management policies as approved by the Finance Committee of AEP’s Board of Directors. AEPSC’s market risk oversight staff independently monitors risk policies, procedures and risk levels and provides members of the Commercial Operations Risk Committee (Regulated Risk Committee) and the Energy Supply Risk Committee (Competitive Risk Committee) various reports regarding compliance with policies, limits and procedures. The Regulated Risk Committee consists of AEPSC’s Chief Operating Officer, Chief Financial Officer, Executive Vice President of Generation, Senior Vice President of Commercial Operations and Chief Risk Officer. The Competitive Risk Committee consists of AEPSC’s Chief Operating Officer, Chief Financial Officer and Chief Risk Officer in addition to Energy Supply’s President and Vice President.

For commercial activities, exchange traded derivatives, namely futures contracts, are generally fair valued based on unadjusted quoted prices in active markets and are classified as Level 1.  Level 2 inputs primarily consist of OTC broker quotes in moderately active or less active markets, as well as exchange traded contracts where there is insufficient market liquidity to warrant inclusion in Level 1.  Management verifies price curves using these broker quotes and classifies these fair values within Level 2 when substantially all of the fair value can be corroborated.  Management typically obtains multiple broker quotes, which are nonbinding in nature but are based on recent trades in the marketplace.  When multiple broker quotes are obtained, the quoted bid and ask prices are averaged.  In certain circumstances, a broker quote may be discarded if it is a clear outlier.  Management uses a historical correlation analysis between the broker quoted location and the illiquid locations.  If the points are highly correlated, these locations are included within Level 2 as well.  Certain OTC and bilaterally executed derivative instruments are executed in less active markets with a lower availability of pricing information.  Illiquid transactions, complex structured transactions, FTRs and counterparty credit risk may require nonmarket based inputs.  Some of these inputs may be internally developed or extrapolated and utilized to estimate fair value.  When such inputs have a significant impact on the measurement of fair value, the instrument is categorized as Level 3.  The main driver of contracts being classified as Level 3 is the inability to substantiate energy price curves in the market.  A portion of the Level 3 instruments have been economically hedged which limits potential earnings volatility.

AEP utilizes its trustee’s external pricing service to estimate the fair value of the underlying investments held in the nuclear trusts.  AEP’s investment managers review and validate the prices utilized by the trustee to determine fair value.  AEP’s management performs its own valuation testing to verify the fair values of the securities.  AEP receives audit reports of the trustee’s operating controls and valuation processes.  The trustee uses multiple pricing vendors for the assets held in the trusts.

Assets in the nuclear trusts, Cash and Cash Equivalents, Other Temporary Investments and Restricted Cash for Securitized Funding are classified using the following methods.  Equities are classified as Level 1 holdings if they are actively traded on exchanges.  Items classified as Level 1 are investments in money market funds, fixed income and equity mutual funds and domestic equity securities.  They are valued based on observable inputs, primarily unadjusted quoted prices in active markets for identical assets.  Items classified as Level 2 are primarily investments in individual fixed income securities and cash equivalent funds.  Fixed income securities generally do not trade on exchanges and do not have an official closing price but their valuation inputs are based on observable market data.  Pricing vendors calculate bond valuations using financial models and matrices.  The models use observable inputs including yields on benchmark securities, quotes by securities brokers, rating agency actions, discounts or premiums on securities compared to par prices, changes in yields for U.S. Treasury securities, corporate actions by bond issuers, prepayment schedules and histories, economic events and, for certain securities, adjustments to yields to reflect changes in the rate of inflation.  Other securities with model-derived valuation inputs that are observable are also classified as Level 2 investments.  Investments with unobservable valuation inputs are classified as Level 3 investments.

Fair Value Measurements of Long-term Debt

The fair values of Long-term Debt are based on quoted market prices, without credit enhancements, for the same or similar issues and the current interest rates offered for instruments with similar maturities classified as Level 2 measurement inputs.  These instruments are not marked-to-market.  The estimates presented are not necessarily indicative of the amounts that could be realized in a current market exchange.

The book values and fair values of Long-term Debt for the Registrants as of March 31, 2016 and December 31, 2015 are summarized in the following table:

	March 31, 2016				December 31, 2015
Company	Book Value		Fair Value		Book Value		Fair Value
	(in millions)
AEP	$	19,782.6	$	22,052.8	$	19,572.7	$	21,201.3
APCo	3,919.3		4,597.8		3,930.7		4,416.7
I&M	2,366.6		2,595.4		2,000.0		2,193.6
OPCo	2,135.5		2,515.4		2,157.7		2,472.7
PSO	1,286.3		1,463.6		1,286.1		1,402.9
SWEPCo	2,272.4		2,483.4		2,273.5		2,417.2

Fair Value Measurements of Other Temporary Investments (Applies to AEP)

Other Temporary Investments include funds held by trustees primarily for the payment of securitization bonds and securities available for sale, including marketable securities that management intends to hold for less than one year and investments by its protected cell of EIS.

The following is a summary of Other Temporary Investments:

	March 31, 2016
Other Temporary Investments	Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
	(in millions)
Restricted Cash (a)	$	147.4	$	—	$	—	$	147.4
Fixed Income Securities – Mutual Funds	91.4		0.1		—		91.5
Equity Securities – Mutual Funds	13.9		11.7		—		25.6
Total Other Temporary Investments	$	252.7	$	11.8	$	—	$	264.5

	December 31, 2015
Other Temporary Investments	Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	(in millions)
Restricted Cash (a)	$	271.0	$	—	$	—		$	271.0
Fixed Income Securities – Mutual Funds	91.1		—		(0.7		)	90.4
Equity Securities – Mutual Funds	13.7		11.7		—			25.4
Total Other Temporary Investments	$	375.8	$	11.7	$	(0.7	)	$	386.8

(a) Primarily represents amounts held for the repayment of debt.

The following table provides the activity for fixed income and equity securities within Other Temporary Investments for the three months ended March 31, 2016 and 2015:

	Three Months Ended March 31,
	2016		2015
	(in millions)
Proceeds from Investment Sales	$	—	$	—
Purchases of Investments	0.4		0.4
Gross Realized Gains on Investment Sales	—		—
Gross Realized Losses on Investment Sales	—		—

As of March 31, 2016 and December 31, 2015, AEP had no Other Temporary Investments with an unrealized loss position.  As of March 31, 2016, fixed income securities were primarily debt based mutual funds with short and intermediate maturities.  Mutual funds may be sold and do not contain maturity dates.

For details of the reasons for changes in Securities Available for Sale included in Accumulated Other Comprehensive Income (Loss) for the three months ended March 31, 2016 and 2015, see Note 3.

Fair Value Measurements of Trust Assets for Decommissioning and SNF Disposal (Applies to AEP and I&M)

Nuclear decommissioning and spent nuclear fuel trust funds represent funds that regulatory commissions allow I&M to collect through rates to fund future decommissioning and spent nuclear fuel disposal liabilities.  By rules or orders, the IURC, the MPSC and the FERC established investment limitations and general risk management guidelines.  In general, limitations include:

• Acceptable investments (rated investment grade or above when purchased).

• Maximum percentage invested in a specific type of investment.

• Prohibition of investment in obligations of AEP, I&M or their affiliates.

• Withdrawals permitted only for payment of decommissioning costs and trust expenses.

I&M maintains trust records for each regulatory jurisdiction.  Regulatory approval is required to withdraw decommissioning funds. These funds are managed by external investment managers who must comply with the guidelines and rules of the applicable regulatory authorities.  The trust assets are invested to optimize the net of tax earnings of the trust giving consideration to liquidity, risk, diversification and other prudent investment objectives.

I&M records securities held in these trust funds in Spent Nuclear Fuel and Decommissioning Trusts on its balance sheets. I&M records these securities at fair value.  I&M classifies securities in the trust funds as available-for-sale due to their long-term purpose.  Other-than-temporary impairments for investments in both debt and equity securities are considered realized losses as a result of securities being managed by an external investment management firm.  The external investment management firm makes specific investment decisions regarding the debt and equity investments held in these trusts and generally intends to sell debt securities in an unrealized loss position as part of a tax optimization strategy.  Impairments reduce the cost basis of the securities which will affect any future unrealized gain or realized gain or loss due to the adjusted cost of investment.  I&M records unrealized gains and other-than-temporary impairments from securities in these trust funds as adjustments to the regulatory liability account for the nuclear decommissioning trust funds and to regulatory assets or liabilities for the SNF disposal trust funds in accordance with their treatment in rates.  Consequently, changes in fair value of trust assets do not affect earnings or AOCI.

The following is a summary of nuclear trust fund investments as of March 31, 2016 and December 31, 2015:

	March 31, 2016							December 31, 2015
	Fair Value		Gross Unrealized Gains		Other-Than-Temporary Impairments			Fair Value		Gross Unrealized Gains		Other-Than-Temporary Impairments
	(in millions)
Cash and Cash Equivalents	$	142.0	$	—	$	—		$	168.3	$	—	$	—
Fixed Income Securities:
United States Government	761.1		52.3		(2.1		)	731.1		35.9		(2.6		)
Corporate Debt	68.9		4.9		(1.0		)	57.9		3.2		(1.1		)
State and Local Government	29.0		1.2		(0.3		)	22.2		1.1		(0.3		)
Subtotal Fixed Income Securities	859.0		58.4		(3.4		)	811.2		40.2		(4.0		)
Equity Securities - Domestic	1,151.4		583.5		(78.9		)	1,126.9		571.6		(79.3		)
Spent Nuclear Fuel and Decommissioning Trusts	$	2,152.4	$	641.9	$	(82.3	)	$	2,106.4	$	611.8	$	(83.3	)

The following table provides the securities activity within the decommissioning and SNF trusts for the three months ended March 31, 2016 and 2015:

	Three Months Ended March 31,
	2016		2015
	(in millions)
Proceeds from Investment Sales	$	1,137.7	$	228.2
Purchases of Investments	1,151.6		245.8
Gross Realized Gains on Investment Sales	15.8		11.2
Gross Realized Losses on Investment Sales	7.8		3.8

The adjusted cost of fixed income securities was $801 million and $771 million as of March 31, 2016 and December 31, 2015, respectively.  The adjusted cost of equity securities was $568 million and $555 million as of March 31, 2016 and December 31, 2015, respectively.

The fair value of fixed income securities held in the nuclear trust funds, summarized by contractual maturities, as of March 31, 2016 was as follows:

	Fair Value of Fixed Income Securities
	(in millions)
Within 1 year	$	175.4
1 year – 5 years	369.6
5 years – 10 years	133.0
After 10 years	181.0
Total	$	859.0

Fair Value Measurements of Financial Assets and Liabilities

The following tables set forth, by level within the fair value hierarchy, the Registrants’ financial assets and liabilities that were accounted for at fair value on a recurring basis as of March 31, 2016 and December 31, 2015.  As required by the accounting guidance for “Fair Value Measurements and Disclosures,” financial assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement.  Management’s assessment of the significance of a particular input to the fair value measurement requires judgment and may affect the valuation of fair value assets and liabilities and their placement within the fair value hierarchy levels.  There have not been any significant changes in management’s valuation techniques.

AEP

Assets and Liabilities Measured at Fair Value on a Recurring Basis

March 31, 2016

	Level 1		Level 2		Level 3		Other			Total
Assets:	(in millions)
Cash and Cash Equivalents (a)	$	9.6	$	4.4	$	—	$	176.4		$	190.4
Other Temporary Investments
Restricted Cash (a)	129.2		7.6		—		10.6			147.4
Fixed Income Securities – Mutual Funds	91.5		—		—		—			91.5
Equity Securities – Mutual Funds (b)	25.6		—		—		—			25.6
TotalOther Temporary Investments	246.3		7.6		—		10.6			264.5
Risk Management Assets
Risk Management Commodity Contracts (c) (d)	10.7		585.5		201.8		(346.0		)	452.0
Cash Flow Hedges:
Commodity Hedges (c)	—		11.4		8.1		0.3			19.8
Fair Value Hedges	—		0.5		—		0.4			0.9
Total Risk Management Assets	10.7		597.4		209.9		(345.3		)	472.7
Spent Nuclear Fuel and Decommissioning Trusts
Cash and Cash Equivalents (e)	135.3		—		—		6.7			142.0
Fixed Income Securities:
United States Government	—		761.1		—		—			761.1
Corporate Debt	—		68.9		—		—			68.9
State and Local Government	—		29.0		—		—			29.0
Subtotal Fixed Income Securities	—		859.0		—		—			859.0
Equity Securities – Domestic (b)	1,151.4		—		—		—			1,151.4
TotalSpent Nuclear Fuel and Decommissioning Trusts	1,286.7		859.0		—		6.7			2,152.4
Total Assets	$	1,553.3	$	1,468.4	$	209.9	$	(151.6	)	$	3,080.0
Liabilities:
Risk Management Liabilities
Risk Management Commodity Contracts (c) (d)	$	20.5	$	569.2	$	58.5	$	(377.2	)	$	271.0
Cash Flow Hedges:
Commodity Hedges (c)	—		29.7		10.1		0.3			40.1
Interest Rate/Foreign Currency Hedges	—		0.4		—		—			0.4
Fair Value Hedges	—		—		—		0.4			0.4
Total Risk Management Liabilities	$	20.5	$	599.3	$	68.6	$	(376.5	)	$	311.9

AEP

Assets and Liabilities Measured at Fair Value on a Recurring Basis

December 31, 2015

	Level 1		Level 2		Level 3		Other			Total
Assets:	(in millions)
Cash and Cash Equivalents (a)	$	3.9	$	4.3	$	—	$	168.2		$	176.4
Other Temporary Investments
Restricted Cash (a)	230.0		7.7		—		33.3			271.0
Fixed Income Securities – Mutual Funds	90.4		—		—		—			90.4
Equity Securities – Mutual Funds (b)	25.4		—		—		—			25.4
TotalOther Temporary Investments	345.8		7.7		—		33.3			386.8
Risk Management Assets
Risk Management Commodity Contracts (c) (f)	11.5		495.0		219.7		(287.7		)	438.5
Cash Flow Hedges:
Commodity Hedges (c)	—		15.9		1.0		0.7			17.6
Fair Value Hedges	—		—		—		0.1			0.1
Total Risk Management Assets	11.5		510.9		220.7		(286.9		)	456.2
Spent Nuclear Fuel and Decommissioning Trusts
Cash and Cash Equivalents (e)	160.5		—		—		7.8			168.3
Fixed Income Securities:
United States Government	—		731.1		—		—			731.1
Corporate Debt	—		57.9		—		—			57.9
State and Local Government	—		22.2		—		—			22.2
Subtotal Fixed Income Securities	—		811.2		—		—			811.2
Equity Securities – Domestic (b)	1,126.9		—		—		—			1,126.9
TotalSpent Nuclear Fuel and Decommissioning Trusts	1,287.4		811.2		—		7.8			2,106.4
Total Assets	$	1,648.6	$	1,334.1	$	220.7	$	(77.6	)	$	3,125.8
Liabilities:
Risk Management Liabilities
Risk Management Commodity Contracts (c) (f)	$	24.1	$	471.5	$	67.3	$	(326.3	)	$	236.6
Cash Flow Hedges:
Commodity Hedges (c)	—		18.9		6.5		0.7			26.1
Interest Rate/Foreign Currency Hedges	—		0.4		—		—			0.4
Fair Value Hedges	—		3.0		—		0.1			3.1
Total Risk Management Liabilities	$	24.1	$	493.8	$	73.8	$	(325.5	)	$	266.2

APCo

Assets and Liabilities Measured at Fair Value on a Recurring Basis

March 31, 2016

	Level 1		Level 2		Level 3		Other			Total
Assets:	(in millions)
Restricted Cash for Securitized Funding (a)	$	7.5	$	—	$	—	$	0.1		$	7.6
Risk Management Assets - Nonaffiliated and Affiliated
Risk Management Commodity Contracts (c) (g)	0.2		16.2		8.2		(12.4		)	12.2
Total Assets:	$	7.7	$	16.2	$	8.2	$	(12.3	)	$	19.8
Liabilities:
Risk Management Liabilities - Nonaffiliated
Risk Management Commodity Contracts (c) (g)	$	0.2	$	17.7	$	5.6	$	(13.0	)	$	10.5

APCo

Assets and Liabilities Measured at Fair Value on a Recurring Basis

December 31, 2015

	Level 1		Level 2		Level 3		Other			Total
Assets:	(in millions)
Restricted Cash for Securitized Funding (a)	$	14.8	$	—	$	—	$	0.1		$	14.9
Risk Management Assets - Nonaffiliated and Affiliated
Risk Management Commodity Contracts (c) (g)	0.2		13.9		12.2		(10.6		)	15.7
Total Assets:	$	15.0	$	13.9	$	12.2	$	(10.5	)	$	30.6
Liabilities:
Risk Management Liabilities - Nonaffiliated
Risk Management Commodity Contracts (c) (g)	$	0.2	$	17.8	$	0.5	$	(13.6	)	$	4.9

I&M

Assets and Liabilities Measured at Fair Value on a Recurring Basis

March 31, 2016

	Level 1		Level 2		Level 3		Other			Total
Assets:	(in millions)
Risk Management Assets - Nonaffiliated and Affiliated
Risk Management Commodity Contracts (c) (g)	$	0.1	$	12.5	$	5.5	$	(8.6	)	$	9.5
Spent Nuclear Fuel and Decommissioning Trusts
Cash and Cash Equivalents (e)	135.3		—		—		6.7			142.0
Fixed Income Securities:
United States Government	—		761.1		—		—			761.1
Corporate Debt	—		68.9		—		—			68.9
State and Local Government	—		29.0		—		—			29.0
Subtotal Fixed Income Securities	—		859.0		—		—			859.0
Equity Securities - Domestic (b)	1,151.4		—		—		—			1,151.4
TotalSpent Nuclear Fuel and Decommissioning Trusts	1,286.7		859.0		—		6.7			2,152.4
Total Assets	$	1,286.8	$	871.5	$	5.5	$	(1.9	)	$	2,161.9
Liabilities:
Risk Management Liabilities - Nonaffiliated
Risk Management Commodity Contracts (c) (g)	$	0.1	$	14.2	$	1.8	$	(8.7	)	$	7.4

I&M

Assets and Liabilities Measured at Fair Value on a Recurring Basis

December 31, 2015

	Level 1		Level 2		Level 3		Other			Total
Assets:	(in millions)
Risk Management Assets - Nonaffiliated and Affiliated
Risk Management Commodity Contracts (c) (g)	$	0.1	$	17.0	$	6.3	$	(11.1	)	$	12.3
Spent Nuclear Fuel and Decommissioning Trusts
Cash and Cash Equivalents (e)	160.5		—		—		7.8			168.3
Fixed Income Securities:
United States Government	—		731.1		—		—			731.1
Corporate Debt	—		57.9		—		—			57.9
State and Local Government	—		22.2		—		—			22.2
Subtotal Fixed Income Securities	—		811.2		—		—			811.2
Equity Securities - Domestic (b)	1,126.9		—		—		—			1,126.9
TotalSpent Nuclear Fuel and Decommissioning Trusts	1,287.4		811.2		—		7.8			2,106.4
Total Assets	$	1,287.5	$	828.2	$	6.3	$	(3.3	)	$	2,118.7
Liabilities:
Risk Management Liabilities - Nonaffiliated
Risk Management Commodity Contracts (c) (g)	$	0.1	$	17.5	$	2.0	$	(11.7	)	$	7.9

OPCo

Assets and Liabilities Measured at Fair Value on a Recurring Basis

March 31, 2016

	Level 1		Level 2		Level 3		Other			Total
Assets:	(in millions)
Restricted Cash for Securitized Funding (a)	$	16.2	$	—	$	—	$	—		$	16.2
Liabilities:
Risk Management Liabilities
Risk Management Commodity Contracts (c) (g)	$	—	$	0.6	$	10.9	$	(0.2	)	$	11.3

OPCo

Assets and Liabilities Measured at Fair Value on a Recurring Basis

December 31, 2015

	Level 1		Level 2		Level 3		Other		Total
Assets:	(in millions)
Restricted Cash for Securitized Funding (a)	$	—	$	—	$	—	$	27.7	$	27.7
Risk Management Assets
Risk Management Commodity Contracts (c) (g)	—		—		16.0		3.2		19.2
Total Assets	$	—	$	—	$	16.0	$	30.9	$	46.9
Liabilities:
Risk Management Liabilities
Risk Management Commodity Contracts (c) (g)	$	—	$	0.8	$	0.1	$	2.7	$	3.6

PSO

Assets and Liabilities Measured at Fair Value on a Recurring Basis

March 31, 2016

	Level 1		Level 2		Level 3		Other			Total
Assets:	(in millions)
Risk Management Assets
Risk Management Commodity Contracts (c) (g)	$	—	$	0.1	$	0.7	$	(0.1	)	$	0.7
Liabilities:
Risk Management Liabilities
Risk Management Commodity Contracts (c) (g)	$	—	$	0.3	$	0.1	$	(0.2	)	$	0.2

PSO

Assets and Liabilities Measured at Fair Value on a Recurring Basis

December 31, 2015

	Level 1		Level 2		Level 3		Other			Total
Assets:	(in millions)
Risk Management Assets
Risk Management Commodity Contracts (c) (g)	$	—	$	—	$	0.7	$	(0.1	)	$	0.6
Liabilities:
Risk Management Liabilities
Risk Management Commodity Contracts (c) (g)	$	—	$	0.5	$	0.1	$	(0.4	)	$	0.2

SWEPCo

Assets and Liabilities Measured at Fair Value on a Recurring Basis

March 31, 2016

	Level 1		Level 2		Level 3		Other			Total
Assets:	(in millions)
Cash and Cash Equivalents (a)	$	9.4	$	—	$	—	$	2.9		$	12.3
Risk Management Assets
Risk Management Commodity Contracts (c) (g)	—		0.1		0.8		(0.1		)	0.8
Total Assets	$	9.4	$	0.1	$	0.8	$	2.8		$	13.1
Liabilities:
Risk Management Liabilities
Risk Management Commodity Contracts (c) (g)	$	—	$	5.5	$	0.1	$	(0.3	)	$	5.3

SWEPCo

Assets and Liabilities Measured at Fair Value on a Recurring Basis

December 31, 2015

	Level 1		Level 2		Level 3		Other			Total
Assets:	(in millions)
Cash and Cash Equivalents (a)	$	3.6	$	—	$	—	$	1.6		$	5.2
Risk Management Assets
Risk Management Commodity Contracts (c) (g)	—		—		0.9		(0.1		)	0.8
Total Assets	$	3.6	$	—	$	0.9	$	1.5		$	6.0
Liabilities:
Risk Management Liabilities
Risk Management Commodity Contracts (c) (g)	$	—	$	5.5	$	0.1	$	(0.4	)	$	5.2

(a) Amounts in “Other’’ column primarily represent cash deposits in bank accounts with financial institutions or with third parties.  Level 1 and Level 2 amounts primarily represent investments in money market funds.

(b) Amounts represent publicly traded equity securities and equity-based mutual funds.

(c) Amounts in “Other’’ column primarily represent counterparty netting of risk management and hedging contracts and associated cash collateral under the accounting guidance for “Derivatives and Hedging.’’

(d) The March 31, 2016 maturity of the net fair value of risk management contracts prior to cash collateral, assets/(liabilities), is as follows:  Level 1 matures $(5) million in 2016 and $(5) million in periods 2017-2019;  Level 2 matures $3 million in 2016, $9 million in periods 2017-2019, $3 million in periods 2020-2021 and $1 million in periods 2022-2032;  Level 3 matures $17 million in 2016, $37 million in periods 2017-2019, $21 million in periods 2020-2021 and $69 million in periods 2022-2032.  Risk management commodity contracts are substantially comprised of power contracts.

(e) Amounts in “Other’’ column primarily represent accrued interest receivables from financial institutions.  Level 1 amounts primarily represent investments in money market funds.

(f) The December 31, 2015 maturity of the net fair value of risk management contracts prior to cash collateral, assets/(liabilities), is as follows:  Level 1 matures $(9) million in 2016 and $(4) million in periods 2017-2019;  Level 2 matures $2 million in 2016, $18 million in periods 2017-2019 and $4 million in periods 2020-2021; Level 3 matures $28 million in 2016, $29 million in periods 2017-2019, $19 million in periods 2020-2021 and $76 million in periods 2022-2032.  Risk management commodity contracts are substantially comprised of power contracts.

(g) Substantially comprised of power contracts for APCo, I&M and OPCo and coal contracts for PSO and SWEPCo.

There were no transfers between Level 1 and Level 2 during the three months ended March 31, 2016 and 2015.

The following tables set forth a reconciliation of changes in the fair value of net trading derivatives classified as Level 3 in the fair value hierarchy:

Three Months Ended March 31, 2016	AEP			APCo (a)			I&M (a)			OPCo			PSO			SWEPCo
	(in millions)
Balance as of December 31, 2015	$	146.9		$	11.7		$	4.3		$	15.9		$	0.6		$	0.8
Realized Gain (Loss) Included in Net Income (or Changes in Net Assets) (b) (c)	23.5			15.3			2.5			(0.6		)	(0.8		)	4.6
Unrealized Gain (Loss) Included in Net Income (or Changes in Net Assets) Relating to Assets Still Held at the Reporting Date (b)	21.9			—			—			—			—			—
Realized and Unrealized Gains (Losses) Included in Other Comprehensive Income	1.3			—			—			—			—			—
Purchases, Issuances and Settlements (d)	(42.7		)	(27.7		)	(4.6		)	1.4			0.5			(4.9		)
Transfers out of Level 3 (f) (g)	10.9			0.1			0.1			—			—			—
Changes in Fair Value Allocated to Regulated Jurisdictions (h)	(20.5		)	3.2			1.4			(27.6		)	0.3			0.2
Balance as of March 31, 2016	$	141.3		$	2.6		$	3.7		$	(10.9	)	$	0.6		$	0.7

Three Months Ended March 31, 2015	AEP			APCo			I&M			OPCo			PSO			SWEPCo
	(in millions)
Balance as of December 31, 2014	$	150.8		$	15.8		$	14.7		$	48.4		$	(0.3	)	$	(0.5	)
Realized Gain (Loss) Included in Net Income (or Changes in Net Assets) (b) (c)	8.6			2.2			0.1			0.2			(0.3		)	5.8
Unrealized Gain (Loss) Included in Net Income (or Changes in Net Assets) Relating to Assets Still Held at the Reporting Date (b)	5.2			—			—			—			—			—
Realized and Unrealized Gains (Losses) Included in Other Comprehensive Income	(1.9		)	—			—			—			—			—
Purchases, Issuances and Settlements (d)	(38.5		)	(13.4		)	(9.0		)	(6.8		)	0.6			(5.3		)
Transfers into Level 3 (e) (f)	15.3			—			—			—			—			—
Transfers out of Level 3 (f) (g)	(12.4		)	—			—			—			—			—
Changes in Fair Value Allocated to Regulated Jurisdictions (h)	3.5			1.4			(0.2		)	4.1			(0.7		)	(1.2		)
Balance as of March 31, 2015	$	130.6		$	6.0		$	5.6		$	45.9		$	(0.7	)	$	(1.2	)

(a) Includes both affiliated and nonaffiliated transactions.

(b) Included in revenues on the condensed statements of income.

(c) Represents the change in fair value between the beginning of the reporting period and the settlement of the risk management commodity contract.

(d) Represents the settlement of risk management commodity contracts for the reporting period.

(e) Represents existing assets or liabilities that were previously categorized as Level 2.

(f) Transfers are recognized based on their value at the beginning of the reporting period that the transfer occurred.

(g) Represents existing assets or liabilities that were previously categorized as Level 3.

(h) Relates to the net gains (losses) of those contracts that are not reflected on the condensed statements of income.  These net gains (losses) are recorded as regulatory liabilities/assets.

The following tables quantify the significant unobservable inputs used in developing the fair value of Level 3 positions as of March 31, 2016 and December 31, 2015:

Significant Unobservable Inputs

March 31, 2016

AEP

						Significant	Input/Range
	Fair Value				Valuation	Unobservable						Weighted
	Assets		Liabilities		Technique	Input	Low			High		Average
	(in millions)
Energy Contracts	$	207.6	$	59.5	Discounted Cash Flow	Forward Market Price (a)	$	8.77		$	162.36	$	45.45
						Counterparty Credit Risk (b)	251			669		NA
FTRs	2.3		9.1		Discounted Cash Flow	Forward Market Price (a)	$	(17.72	)	$	10.50	$	0.60
Total	$	209.9	$	68.6

Significant Unobservable Inputs

December 31, 2015

AEP

						Significant	Input/Range
	Fair Value				Valuation	Unobservable						Weighted
	Assets		Liabilities		Technique	Input	Low			High		Average
	(in millions)
Energy Contracts	$	212.3	$	70.3	Discounted Cash Flow	Forward Market Price (a)	$	9.69		$	165.36	$	36.35
						Counterparty Credit Risk (b)	670
FTRs	8.4		3.5		Discounted Cash Flow	Forward Market Price (a)	$	(6.99	)	$	10.34	$	1.10
Total	$	220.7	$	73.8

Significant Unobservable Inputs

March 31, 2016

APCo

						Significant	Forward Price Range
	Fair Value				Valuation	Unobservable					Weighted
	Assets		Liabilities		Technique	Input (a)	Low		High		Average
	(in millions)
Energy Contracts	$	8.2	$	0.1	Discounted Cash Flow	Forward Market Price	$	8.77	$	47.05	$	29.14
FTRs	—		5.5		Discounted Cash Flow	Forward Market Price	0.42		5.58		1.90
Total	$	8.2	$	5.6

Significant Unobservable Inputs

December 31, 2015

APCo

						Significant	Forward Price Range
	Fair Value				Valuation	Unobservable						Weighted
	Assets		Liabilities		Technique	Input (a)	Low			High		Average
	(in millions)
Energy Contracts	$	7.9	$	0.2	Discounted Cash Flow	Forward Market Price	$	12.61		$	47.24	$	32.38
FTRs	4.3		0.3		Discounted Cash Flow	Forward Market Price	(6.96		)	8.43		1.34
Total	$	12.2	$	0.5

Significant Unobservable Inputs

March 31, 2016

I&M

						Significant	Forward Price Range
	Fair Value				Valuation	Unobservable						Weighted
	Assets		Liabilities		Technique	Input (a)	Low			High		Average
	(in millions)
Energy Contracts	$	5.5	$	0.1	Discounted Cash Flow	Forward Market Price	$	8.77		$	47.05	$	29.14
FTRs	—		1.7		Discounted Cash Flow	Forward Market Price	(0.07		)	5.58		0.42
Total	$	5.5	$	1.8

Significant Unobservable Inputs

December 31, 2015

I&M

						Significant	Forward Price Range
	Fair Value				Valuation	Unobservable						Weighted
	Assets		Liabilities		Technique	Input (a)	Low			High		Average
	(in millions)
Energy Contracts	$	6.0	$	0.2	Discounted Cash Flow	Forward Market Price	$	12.61		$	47.24	$	32.38
FTRs	0.3		1.8		Discounted Cash Flow	Forward Market Price	(6.96		)	8.43		1.34
Total	$	6.3	$	2.0

Significant Unobservable Inputs

March 31, 2016

OPCo

						Significant	Forward Price Range
	Fair Value				Valuation	Unobservable					Weighted
	Assets		Liabilities		Technique	Input	Low		High		Average
	(in millions)
Energy Contracts	$	—	$	10.9	Discounted Cash Flow	Forward Market Price (a)	$	36.41	$	162.36	$	84.24
						Counterparty Credit Risk (b)	251
Total	$	—	$	10.9

Significant Unobservable Inputs

December 31, 2015

OPCo

Significant

Forward Price Range

Fair Value

Valuation

Unobservable

Weighted

Assets

Liabilities

Technique

Input (a)

Low

High

Average

(in millions)

Energy Contracts

$

16.0

$

0.1

Discounted Cash Flow

Forward Market Price

$

41.61

$

165.36

$

86.84

Significant Unobservable Inputs

March 31, 2016

PSO

						Significant	Forward Price Range
	Fair Value				Valuation	Unobservable						Weighted
	Assets		Liabilities		Technique	Input (a)	Low			High		Average
	(in millions)
FTRs	$	0.7	$	0.1	Discounted Cash Flow	Forward Market Price	$	(17.72	)	$	1.80	$	(0.59	)

Significant Unobservable Inputs

December 31, 2015

PSO

Significant

Forward Price Range

Fair Value

Valuation

Unobservable

Weighted

Assets

Liabilities

Technique

Input (a)

Low

High

Average

(in millions)

FTRs

$

0.7

$

0.1

Discounted Cash Flow

Forward Market Price

$

(6.96

)

$

8.43

$

1.34

Significant Unobservable Inputs

March 31, 2016

SWEPCo

						Significant	Forward Price Range
	Fair Value				Valuation	Unobservable						Weighted
	Assets		Liabilities		Technique	Input (a)	Low			High		Average
	(in millions)
FTRs	$	0.8	$	0.1	Discounted Cash Flow	Forward Market Price	$	(17.72	)	$	1.80	$	(0.59	)

Significant Unobservable Inputs

December 31, 2015

SWEPCo

Significant

Forward Price Range

Fair Value

Valuation

Unobservable

Weighted

Assets

Liabilities

Technique

Input (a)

Low

High

Average

(in millions)

FTRs

$

0.9

$

0.1

Discounted Cash Flow

Forward Market Price

$

(6.96

)

$

8.43

$

1.34

(a) Represents market prices in dollars per MWh.

(b) Represents average price of credit default swaps used to calculate counterparty credit risk, reported in basis points.

NA    Not applicable.

The following table provides sensitivity of fair value measurements to increases (decreases) in significant unobservable inputs related to Energy Contracts and FTRs for the Registrants as of March 31, 2016 and December 31, 2015:

Sensitivity of Fair Value Measurements

Significant Unobservable Input	Position	Change in Input	Impact on Fair Value Measurement
Forward Market Price	Buy	Increase (Decrease)	Higher (Lower)
Forward Market Price	Sell	Increase (Decrease)	Lower (Higher)
Counterparty Credit Risk	Loss	Increase (Decrease)	Higher (Lower)
Counterparty Credit Risk	Gain	Increase (Decrease)	Lower (Higher)