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Fair Value Measurements (Tables)
 6 Months Ended
Jun. 30, 2016
Book Values and Fair Values of Long-term Debt
 
 
June 30, 2016
 
December 31, 2015
Company
 
Book Value
 
Fair Value
 
Book Value
 
Fair Value
 
 
(in millions)
AEP
 
$
19,543.7

 
$
22,443.2

 
$
19,572.7

 
$
21,201.3

APCo
 
4,044.5

 
4,910.6

 
3,930.7

 
4,416.7

I&M
 
2,430.3

 
2,745.8

 
2,000.0

 
2,193.6

OPCo
 
1,786.0

 
2,220.0

 
2,157.7

 
2,472.7

PSO
 
1,286.4

 
1,481.8

 
1,286.1

 
1,402.9

SWEPCo
 
2,272.8

 
2,555.0

 
2,273.5

 
2,417.2
Other Temporary Investments
 
 
June 30, 2016
Other Temporary Investments
 
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
 
 
(in millions)
Restricted Cash (a)
 
$
188.5

 
$
—

 
$
—

 
$
188.5

Fixed Income Securities – Mutual Funds
 
91.8

 
0.5

 
—

 
92.3

Equity Securities – Mutual Funds
 
14.0

 
12.1

 
—

 
26.1

Total Other Temporary Investments
 
$
294.3

 
$
12.6

 
$
—

 
$
306.9

 
 
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.
Debt and Equity Securities Within Other Temporary Investments
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2016
 
2015
 
2016
 
2015
 
(in millions)
Proceeds from Investment Sales
$
—

 
$
—

 
$
—

 
$
—

Purchases of Investments
0.6

 
0.4

 
1.0

 
0.8

Gross Realized Gains on Investment Sales
—

 
—

 
—

 
—

Gross Realized Losses on Investment Sales
—

 
—

 
—

 
—
Nuclear Trust Fund Investments
 
June 30, 2016
 
December 31, 2015
 
 
 
Gross
 
Other-Than-
 
 
 
Gross
 
Other-Than-
 
Fair
 
Unrealized
 
Temporary
 
Fair
 
Unrealized
 
Temporary
 
Value
 
Gains
 
Impairments
 
Value
 
Gains
 
Impairments
 
(in millions)
Cash and Cash Equivalents
$
18.6

 
$
—

 
$
—

 
$
168.3

 
$
—

 
$
—

Fixed Income Securities:
 

 
 

 
 

 
 

 
 

 
 

United States Government
748.9

 
62.2

 
(2.1
)
 
731.1

 
35.9

 
(2.6
)
Corporate Debt
66.0

 
6.3

 
(1.0
)
 
57.9

 
3.2

 
(1.1
)
State and Local Government
181.0

 
0.9

 
(0.7
)
 
22.2

 
1.1

 
(0.3
)
Subtotal Fixed Income Securities
995.9

 
69.4

 
(3.8
)
 
811.2

 
40.2

 
(4.0
)
Equity Securities - Domestic
1,181.5

 
605.5

 
(78.1
)
 
1,126.9

 
571.6

 
(79.3
)
Spent Nuclear Fuel and Decommissioning Trusts
$
2,196.0

 
$
674.9

 
$
(81.9
)
 
$
2,106.4

 
$
611.8

 
$
(83.3
)
Securities Activity Within the Decommissioning and SNF Trusts
 
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
 
2016
 
2015
 
2016
 
2015
 
 
(in millions)
Proceeds from Investment Sales
 
$
639.3

 
$
287.6

 
$
1,777.0

 
$
515.8

Purchases of Investments
 
644.8

 
294.9

 
1,796.4

 
540.7

Gross Realized Gains on Investment Sales
 
12.2

 
7.6

 
28.0

 
18.8

Gross Realized Losses on Investment Sales
 
7.9

 
5.9

 
15.7

 
9.7
Contractual Maturities, Fair Value of Debt Securities in Nuclear Trusts
 
Fair Value of Fixed Income Securities
 
(in millions)
Within 1 year
$
169.7

1 year – 5 years
378.2

5 years – 10 years
193.3

After 10 years
254.7

Total
$
995.9
Fair Value, Assets and Liabilities Measured on Recurring Basis
(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 June 30, 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 periods 2017-2019;  Level 2 matures $5 million in 2016, $9 million in periods 2017-2019 and $2 million in periods 2020-2021;  Level 3 matures $5 million in 2016, $30 million in periods 2017-2019, $20 million in periods 2020-2021 and $76 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 the Registrant Subsidiaries.
AEP

Assets and Liabilities Measured at Fair Value on a Recurring Basis
June 30, 2016
 
 
Level 1
 
Level 2
 
Level 3
 
Other
 
Total
Assets:
 
(in millions)
 
 
 
 
 
 
 
 
 
 
 
Cash and Cash Equivalents (a)
 
$
11.0

 
$
4.4

 
$
—

 
$
231.4

 
$
246.8

 
 
 
 
 
 
 
 
 
 
 
Other Temporary Investments
 
 
 
 
 
 
 
 
 
 
Restricted Cash (a)
 
144.1

 
10.4

 
—

 
34.0

 
188.5

Fixed Income Securities – Mutual Funds
 
92.3

 
—

 
—

 
—

 
92.3

Equity Securities – Mutual Funds (b)
 
26.1

 
—

 
—

 
—

 
26.1

Total Other Temporary Investments
 
262.5

 
10.4

 
—

 
34.0

 
306.9

 
 
 
 
 
 
 
 
 
 
 
Risk Management Assets
 
 

 
 

 
 

 
 

 
 

Risk Management Commodity Contracts (c) (d)
 
9.3

 
430.8

 
188.3

 
(248.2
)
 
380.2

Cash Flow Hedges:
 
 

 
 

 
 

 
 

 
 

Commodity Hedges (c)
 
—

 
8.9

 
25.0

 
(5.6
)
 
28.3

Fair Value Hedges
 
—

 
1.1

 
—

 
—

 
1.1

Total Risk Management Assets
 
9.3

 
440.8

 
213.3

 
(253.8
)
 
409.6

 
 
 
 
 
 
 
 
 
 
 
Spent Nuclear Fuel and Decommissioning Trusts
 
 

 
 

 
 

 
 

 
 

Cash and Cash Equivalents (e)
 
8.1

 
—

 
—

 
10.5

 
18.6

Fixed Income Securities:
 
 

 
 

 
 

 
 

 
 

United States Government
 
—

 
748.9

 
—

 
—

 
748.9

Corporate Debt
 
—

 
66.0

 
—

 
—

 
66.0

State and Local Government
 
—

 
181.0

 
—

 
—

 
181.0

Subtotal Fixed Income Securities
 
—

 
995.9

 
—

 
—

 
995.9

Equity Securities – Domestic (b)
 
1,181.5

 
—

 
—

 
—

 
1,181.5

Total Spent Nuclear Fuel and Decommissioning Trusts
 
1,189.6

 
995.9

 
—

 
10.5

 
2,196.0

 
 
 
 
 
 
 
 
 
 
 
Total Assets
 
$
1,472.4

 
$
1,451.5

 
$
213.3

 
$
22.1

 
$
3,159.3

 
 
 
 
 
 
 
 
 
 
 
Liabilities:
 
 

 
 

 
 

 
 

 
 

 
 
 
 
 
 
 
 
 
 
 
Risk Management Liabilities
 
 

 
 

 
 

 
 

 
 

Risk Management Commodity Contracts (c) (d)
 
$
13.7

 
$
415.1

 
$
57.1

 
$
(258.9
)
 
$
227.0

Cash Flow Hedges:
 
 

 
 

 
 

 
 

 
 

Commodity Hedges (c)
 
—

 
24.0

 
6.9

 
(5.6
)
 
25.3

Interest Rate/Foreign Currency Hedges
 
—

 
0.2

 
—

 
—

 
0.2

Total Risk Management Liabilities
 
$
13.7

 
$
439.3

 
$
64.0

 
$
(264.5
)
 
$
252.5


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

Total Other 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

Total Spent 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
Changes in Fair Value of Net Trading Derivatives and Other Investments
Three Months Ended June 30, 2016
 
AEP
 
APCo (a)
 
I&M (a)
 
OPCo
 
PSO
 
SWEPCo
 
 
(in millions)
Balance as of March 31, 2016
 
$
141.3

 
$
2.6

 
$
3.7

 
$
(10.9
)
 
$
0.6

 
$
0.7

Realized Gain (Loss) Included in Net Income (or Changes in Net Assets) (b) (c)
 
16.0

 
8.6

 
3.5

 
(0.2
)
 
(0.4
)
 
2.7

Unrealized Gain (Loss) Included in Net Income (or Changes in Net Assets) Relating to Assets Still Held at the Reporting Date (b)
 
2.9

 
—

 
—

 
—

 
—

 
—

Realized and Unrealized Gains (Losses) Included in Other Comprehensive Income
 
17.3

 
—

 
—

 
—

 
—

 
—

Purchases, Issuances and Settlements (d)
 
(17.5
)
 
(6.8
)
 
(4.6
)
 
1.7

 
(0.2
)
 
(3.5
)
Transfers into Level 3 (e) (f)
 
8.2

 
—

 
—

 
—

 
—

 
—

Changes in Fair Value Allocated to Regulated Jurisdictions (h)
 
(18.9
)
 
(17.3
)
 
0.9

 
(5.2
)
 
1.1

 
1.5

Balance as of June 30, 2016
 
$
149.3

 
$
(12.9
)
 
$
3.5

 
$
(14.6
)
 
$
1.1

 
$
1.4

Three Months Ended June 30, 2015
 
AEP
 
APCo
 
I&M
 
OPCo
 
PSO
 
SWEPCo
 
 
(in millions)
Balance as of March 31, 2015
 
$
130.6

 
$
6.0

 
$
5.6

 
$
45.9

 
$
(0.7
)
 
$
(1.2
)
Realized Gain (Loss) Included in Net Income (or Changes in Net Assets) (b) (c)
 
2.2

 
(1.4
)
 
(0.8
)
 
0.7

 
0.8

 
4.2

Unrealized Gain (Loss) Included in Net Income (or Changes in Net Assets) Relating to Assets Still Held at the Reporting Date (b)
 
12.4

 
—

 
—

 
—

 
—

 
—

Purchases, Issuances and Settlements (d)
 
(15.9
)
 
(1.6
)
 
(2.3
)
 
(1.7
)
 
(0.1
)
 
(3.0
)
Transfers into Level 3 (e) (f)
 
41.6

 
—

 
—

 
—

 
—

 
—

Transfers out of Level 3 (f) (g)
 
(1.8
)
 
1.2

 
0.8

 
—

 
—

 
—

Changes in Fair Value Allocated to Regulated Jurisdictions (h)
 
34.0

 
29.6

 
8.5

 
(7.2
)
 
1.7

 
2.0

Balance as of June 30, 2015
 
$
203.1

 
$
33.8

 
$
11.8

 
$
37.7

 
$
1.7

 
$
2.0

Six Months Ended June 30, 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)
 
41.3

 
25.1

 
6.7

 
(1.4
)
 
(1.0
)
 
7.7

Unrealized Gain (Loss) Included in Net Income (or Changes in Net Assets) Relating to Assets Still Held at the Reporting Date (b)
 
24.8

 
—

 
—

 
—

 
—

 
—

Realized and Unrealized Gains (Losses) Included in Other Comprehensive Income
 
18.8

 
—

 
—

 
—

 
—

 
—

Purchases, Issuances and Settlements (d)
 
(60.0
)
 
(34.5
)
 
(9.2
)
 
3.1

 
0.4

 
(8.4
)
Transfers into Level 3 (e) (f)
 
8.1

 
—

 
—

 
—

 
—

 
—

Transfers out of Level 3 (f) (g)
 
10.9

 
0.1

 
0.1

 
—

 
—

 
—

Changes in Fair Value Allocated to Regulated Jurisdictions (h)
 
(41.5
)
 
(15.3
)
 
1.6

 
(32.2
)
 
1.1

 
1.3

Balance as of June 30, 2016
 
$
149.3

 
$
(12.9
)
 
$
3.5

 
$
(14.6
)
 
$
1.1

 
$
1.4

Six Months Ended June 30, 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)
 
11.8

 
1.2

 
(0.9
)
 
1.6

 
(0.2
)
 
9.2

Unrealized Gain (Loss) Included in Net Income (or Changes in Net Assets) Relating to Assets Still Held at the Reporting Date (b)
 
51.4

 
—

 
—

 
—

 
—

 
—

Realized and Unrealized Gains (Losses) Included in Other Comprehensive Income
 
(1.9
)
 
—

 
—

 
—

 
—

 
—

Purchases, Issuances and Settlements (d)
 
(54.1
)
 
(15.0
)
 
(11.3
)
 
(8.4
)
 
0.5

 
(8.7
)
Transfers into Level 3 (e) (f)
 
20.8

 
—

 
—

 
—

 
—

 
—

Transfers out of Level 3 (f) (g)
 
(14.1
)
 
1.2

 
0.8

 
—

 
—

 
—

Changes in Fair Value Allocated to Regulated Jurisdictions (h)
 
38.4

 
30.6

 
8.5

 
(3.9
)
 
1.7

 
2.0

Balance as of June 30, 2015
 
$
203.1

 
$
33.8

 
$
11.8

 
$
37.7

 
$
1.7

 
$
2.0


(a)
Includes both affiliated and nonaffiliated transactions.
(b)
Included in revenues on the 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 statements of income.  These net gains (losses) are recorded as regulatory liabilities/assets.
Significant Unobservable Inputs for Level 3
Significant Unobservable Inputs
June 30, 2016
AEP
 
 
 
 
 
Significant
 
Input/Range
 
Fair Value
Valuation
 
Unobservable
 
 
 
 
 
Weighted
 
Assets
 
Liabilities
 
Technique
 
Input
 
Low
 
High
 
Average
 
(in millions)
 
 
 
 
 
 
 
 
 
 
Energy Contracts
$
206.6

 
$
44.2

 
Discounted Cash Flow 
 
Forward Market Price (a) 
 
$
9.32

 
$
162.36

 
$
46.01

 
 
 
 
 
 
 
Counterparty Credit Risk (b) 
 
172

 
437

 
NA

FTRs
6.7

 
19.8

 
Discounted Cash Flow 
 
Forward Market Price (a) 
 
$
(7.12
)
 
$
7.75

 
$
0.71

Total
$
213.3

 
$
64.0

 
 
 
 
 
 

 
 

 
 

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

 
 
 
 
 
 

 
 

 
 
(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.
Sensitivity of Fair Value Measurements
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]  
Book Values and Fair Values of Long-term Debt
 
 
June 30, 2016
 
December 31, 2015
Company
 
Book Value
 
Fair Value
 
Book Value
 
Fair Value
 
 
(in millions)
AEP
 
$
19,543.7

 
$
22,443.2

 
$
19,572.7

 
$
21,201.3

APCo
 
4,044.5

 
4,910.6

 
3,930.7

 
4,416.7

I&M
 
2,430.3

 
2,745.8

 
2,000.0

 
2,193.6

OPCo
 
1,786.0

 
2,220.0

 
2,157.7

 
2,472.7

PSO
 
1,286.4

 
1,481.8

 
1,286.1

 
1,402.9

SWEPCo
 
2,272.8

 
2,555.0

 
2,273.5

 
2,417.2
Fair Value, Assets and Liabilities Measured on Recurring Basis
APCo

Assets and Liabilities Measured at Fair Value on a Recurring Basis
June 30, 2016
 
 
Level 1
 
Level 2
 
Level 3
 
Other
 
Total
Assets:
 
(in millions)
 
 
 
 
 
 
 
 
 
 
 
Restricted Cash for Securitized Funding (a)
 
$
15.0

 
$
—

 
$
—

 
$
0.1

 
$
15.1

 
 
 
 
 
 
 
 
 
 
 
Risk Management Assets - Nonaffiliated and Affiliated
 
 

 
 

 
 

 
 

 
 

Risk Management Commodity Contracts (c) (g)
 
—

 
13.9

 
3.1

 
(11.6
)
 
5.4

 
 
 
 
 
 
 
 
 
 
 
Total Assets:
 
$
15.0

 
$
13.9

 
$
3.1

 
$
(11.5
)
 
$
20.5

 
 
 
 
 
 
 
 
 
 
 
Liabilities:
 
 

 
 

 
 

 
 

 
 

 
 
 
 
 
 
 
 
 
 
 
Risk Management Liabilities - Nonaffiliated
 
 

 
 

 
 

 
 

 
 

Risk Management Commodity Contracts (c) (g)
 
$
—

 
$
14.0

 
$
16.0

 
$
(11.2
)
 
$
18.8


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

(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 June 30, 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 periods 2017-2019;  Level 2 matures $5 million in 2016, $9 million in periods 2017-2019 and $2 million in periods 2020-2021;  Level 3 matures $5 million in 2016, $30 million in periods 2017-2019, $20 million in periods 2020-2021 and $76 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 the Registrant Subsidiaries.
Changes in Fair Value of Net Trading Derivatives and Other Investments
Three Months Ended June 30, 2016
 
AEP
 
APCo (a)
 
I&M (a)
 
OPCo
 
PSO
 
SWEPCo
 
 
(in millions)
Balance as of March 31, 2016
 
$
141.3

 
$
2.6

 
$
3.7

 
$
(10.9
)
 
$
0.6

 
$
0.7

Realized Gain (Loss) Included in Net Income (or Changes in Net Assets) (b) (c)
 
16.0

 
8.6

 
3.5

 
(0.2
)
 
(0.4
)
 
2.7

Unrealized Gain (Loss) Included in Net Income (or Changes in Net Assets) Relating to Assets Still Held at the Reporting Date (b)
 
2.9

 
—

 
—

 
—

 
—

 
—

Realized and Unrealized Gains (Losses) Included in Other Comprehensive Income
 
17.3

 
—

 
—

 
—

 
—

 
—

Purchases, Issuances and Settlements (d)
 
(17.5
)
 
(6.8
)
 
(4.6
)
 
1.7

 
(0.2
)
 
(3.5
)
Transfers into Level 3 (e) (f)
 
8.2

 
—

 
—

 
—

 
—

 
—

Changes in Fair Value Allocated to Regulated Jurisdictions (h)
 
(18.9
)
 
(17.3
)
 
0.9

 
(5.2
)
 
1.1

 
1.5

Balance as of June 30, 2016
 
$
149.3

 
$
(12.9
)
 
$
3.5

 
$
(14.6
)
 
$
1.1

 
$
1.4

Three Months Ended June 30, 2015
 
AEP
 
APCo
 
I&M
 
OPCo
 
PSO
 
SWEPCo
 
 
(in millions)
Balance as of March 31, 2015
 
$
130.6

 
$
6.0

 
$
5.6

 
$
45.9

 
$
(0.7
)
 
$
(1.2
)
Realized Gain (Loss) Included in Net Income (or Changes in Net Assets) (b) (c)
 
2.2

 
(1.4
)
 
(0.8
)
 
0.7

 
0.8

 
4.2

Unrealized Gain (Loss) Included in Net Income (or Changes in Net Assets) Relating to Assets Still Held at the Reporting Date (b)
 
12.4

 
—

 
—

 
—

 
—

 
—

Purchases, Issuances and Settlements (d)
 
(15.9
)
 
(1.6
)
 
(2.3
)
 
(1.7
)
 
(0.1
)
 
(3.0
)
Transfers into Level 3 (e) (f)
 
41.6

 
—

 
—

 
—

 
—

 
—

Transfers out of Level 3 (f) (g)
 
(1.8
)
 
1.2

 
0.8

 
—

 
—

 
—

Changes in Fair Value Allocated to Regulated Jurisdictions (h)
 
34.0

 
29.6

 
8.5

 
(7.2
)
 
1.7

 
2.0

Balance as of June 30, 2015
 
$
203.1

 
$
33.8

 
$
11.8

 
$
37.7

 
$
1.7

 
$
2.0

Six Months Ended June 30, 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)
 
41.3

 
25.1

 
6.7

 
(1.4
)
 
(1.0
)
 
7.7

Unrealized Gain (Loss) Included in Net Income (or Changes in Net Assets) Relating to Assets Still Held at the Reporting Date (b)
 
24.8

 
—

 
—

 
—

 
—

 
—

Realized and Unrealized Gains (Losses) Included in Other Comprehensive Income
 
18.8

 
—

 
—

 
—

 
—

 
—

Purchases, Issuances and Settlements (d)
 
(60.0
)
 
(34.5
)
 
(9.2
)
 
3.1

 
0.4

 
(8.4
)
Transfers into Level 3 (e) (f)
 
8.1

 
—

 
—

 
—

 
—

 
—

Transfers out of Level 3 (f) (g)
 
10.9

 
0.1

 
0.1

 
—

 
—

 
—

Changes in Fair Value Allocated to Regulated Jurisdictions (h)
 
(41.5
)
 
(15.3
)
 
1.6

 
(32.2
)
 
1.1

 
1.3

Balance as of June 30, 2016
 
$
149.3

 
$
(12.9
)
 
$
3.5

 
$
(14.6
)
 
$
1.1

 
$
1.4

Six Months Ended June 30, 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)
 
11.8

 
1.2

 
(0.9
)
 
1.6

 
(0.2
)
 
9.2

Unrealized Gain (Loss) Included in Net Income (or Changes in Net Assets) Relating to Assets Still Held at the Reporting Date (b)
 
51.4

 
—

 
—

 
—

 
—

 
—

Realized and Unrealized Gains (Losses) Included in Other Comprehensive Income
 
(1.9
)
 
—

 
—

 
—

 
—

 
—

Purchases, Issuances and Settlements (d)
 
(54.1
)
 
(15.0
)
 
(11.3
)
 
(8.4
)
 
0.5

 
(8.7
)
Transfers into Level 3 (e) (f)
 
20.8

 
—

 
—

 
—

 
—

 
—

Transfers out of Level 3 (f) (g)
 
(14.1
)
 
1.2

 
0.8

 
—

 
—

 
—

Changes in Fair Value Allocated to Regulated Jurisdictions (h)
 
38.4

 
30.6

 
8.5

 
(3.9
)
 
1.7

 
2.0

Balance as of June 30, 2015
 
$
203.1

 
$
33.8

 
$
11.8

 
$
37.7

 
$
1.7

 
$
2.0


(a)
Includes both affiliated and nonaffiliated transactions.
(b)
Included in revenues on the 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 statements of income.  These net gains (losses) are recorded as regulatory liabilities/assets.
Significant Unobservable Inputs for Level 3
Significant Unobservable Inputs
June 30, 2016
APCo
 
 
 
 
 
Significant
 
Forward Price Range
 
Fair Value
 
Valuation
 
Unobservable
 
 
 
 
 
Weighted
 
Assets
 
Liabilities
 
Technique
 
Input (a)
 
Low
 
High
 
Average
 
(in millions)
 
 
 
 
 
 
 
 
 
 
Energy Contracts
$
3.0

 
$
0.4

 
Discounted Cash Flow 
 
Forward Market Price 
 
$
10.20

 
$
50.27

 
$
35.25

FTRs
0.1

 
15.6

 
Discounted Cash Flow 
 
Forward Market Price 
 
(0.18
)
 
7.63

 
1.85

Total
$
3.1

 
$
16.0

 
 
 
 
 
 

 
 

 
 

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

 
 
 
 
 
 

 
 

 
 
(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.
Sensitivity of Fair Value Measurements
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]  
Book Values and Fair Values of Long-term Debt
 
 
June 30, 2016
 
December 31, 2015
Company
 
Book Value
 
Fair Value
 
Book Value
 
Fair Value
 
 
(in millions)
AEP
 
$
19,543.7

 
$
22,443.2

 
$
19,572.7

 
$
21,201.3

APCo
 
4,044.5

 
4,910.6

 
3,930.7

 
4,416.7

I&M
 
2,430.3

 
2,745.8

 
2,000.0

 
2,193.6

OPCo
 
1,786.0

 
2,220.0

 
2,157.7

 
2,472.7

PSO
 
1,286.4

 
1,481.8

 
1,286.1

 
1,402.9

SWEPCo
 
2,272.8

 
2,555.0

 
2,273.5

 
2,417.2
Nuclear Trust Fund Investments
 
June 30, 2016
 
December 31, 2015
 
 
 
Gross
 
Other-Than-
 
 
 
Gross
 
Other-Than-
 
Fair
 
Unrealized
 
Temporary
 
Fair
 
Unrealized
 
Temporary
 
Value
 
Gains
 
Impairments
 
Value
 
Gains
 
Impairments
 
(in millions)
Cash and Cash Equivalents
$
18.6

 
$
—

 
$
—

 
$
168.3

 
$
—

 
$
—

Fixed Income Securities:
 

 
 

 
 

 
 

 
 

 
 

United States Government
748.9

 
62.2

 
(2.1
)
 
731.1

 
35.9

 
(2.6
)
Corporate Debt
66.0

 
6.3

 
(1.0
)
 
57.9

 
3.2

 
(1.1
)
State and Local Government
181.0

 
0.9

 
(0.7
)
 
22.2

 
1.1

 
(0.3
)
Subtotal Fixed Income Securities
995.9

 
69.4

 
(3.8
)
 
811.2

 
40.2

 
(4.0
)
Equity Securities - Domestic
1,181.5

 
605.5

 
(78.1
)
 
1,126.9

 
571.6

 
(79.3
)
Spent Nuclear Fuel and Decommissioning Trusts
$
2,196.0

 
$
674.9

 
$
(81.9
)
 
$
2,106.4

 
$
611.8

 
$
(83.3
)
Securities Activity Within the Decommissioning and SNF Trusts
 
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
 
2016
 
2015
 
2016
 
2015
 
 
(in millions)
Proceeds from Investment Sales
 
$
639.3

 
$
287.6

 
$
1,777.0

 
$
515.8

Purchases of Investments
 
644.8

 
294.9

 
1,796.4

 
540.7

Gross Realized Gains on Investment Sales
 
12.2

 
7.6

 
28.0

 
18.8

Gross Realized Losses on Investment Sales
 
7.9

 
5.9

 
15.7

 
9.7
Contractual Maturities, Fair Value of Debt Securities in Nuclear Trusts
 
Fair Value of Fixed Income Securities
 
(in millions)
Within 1 year
$
169.7

1 year – 5 years
378.2

5 years – 10 years
193.3

After 10 years
254.7

Total
$
995.9
Fair Value, Assets and Liabilities Measured on Recurring Basis
I&M

Assets and Liabilities Measured at Fair Value on a Recurring Basis
June 30, 2016
 
 
Level 1
 
Level 2
 
Level 3
 
Other
 
Total
Assets:
 
(in millions)
 
 
 
 
 
 
 
 
 
 
 
Risk Management Assets - Nonaffiliated and Affiliated
 
 

 
 

 
 

 
 

 
 

Risk Management Commodity Contracts (c) (g)
 
$
—

 
$
10.9

 
$
3.8

 
$
(9.4
)
 
$
5.3

 
 
 
 
 
 
 
 
 
 
 
Spent Nuclear Fuel and Decommissioning Trusts
 
 

 
 

 
 

 
 

 
 

Cash and Cash Equivalents (e)
 
8.1

 
—

 
—

 
10.5

 
18.6

Fixed Income Securities:
 
 

 
 

 
 

 
 

 
 

United States Government
 
—

 
748.9

 
—

 
—

 
748.9

Corporate Debt
 
—

 
66.0

 
—

 
—

 
66.0

State and Local Government
 
—

 
181.0

 
—

 
—

 
181.0

Subtotal Fixed Income Securities
 
—

 
995.9

 
—

 
—

 
995.9

Equity Securities - Domestic (b)
 
1,181.5

 
—

 
—

 
—

 
1,181.5

Total Spent Nuclear Fuel and Decommissioning Trusts
 
1,189.6

 
995.9

 
—

 
10.5

 
2,196.0

 
 
 
 
 
 
 
 
 
 
 
Total Assets
 
$
1,189.6

 
$
1,006.8

 
$
3.8

 
$
1.1

 
$
2,201.3

 
 
 
 
 
 
 
 
 
 
 
Liabilities:
 
 

 
 

 
 

 
 

 
 

 
 
 
 
 
 
 
 
 
 
 
Risk Management Liabilities - Nonaffiliated
 
 

 
 

 
 

 
 

 
 

Risk Management Commodity Contracts (c) (g)
 
$
—

 
$
13.7

 
$
0.3

 
$
(10.0
)
 
$
4.0


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

Total Spent 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

(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 June 30, 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 periods 2017-2019;  Level 2 matures $5 million in 2016, $9 million in periods 2017-2019 and $2 million in periods 2020-2021;  Level 3 matures $5 million in 2016, $30 million in periods 2017-2019, $20 million in periods 2020-2021 and $76 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 the Registrant Subsidiaries.
Changes in Fair Value of Net Trading Derivatives and Other Investments
Three Months Ended June 30, 2016
 
AEP
 
APCo (a)
 
I&M (a)
 
OPCo
 
PSO
 
SWEPCo
 
 
(in millions)
Balance as of March 31, 2016
 
$
141.3

 
$
2.6

 
$
3.7

 
$
(10.9
)
 
$
0.6

 
$
0.7

Realized Gain (Loss) Included in Net Income (or Changes in Net Assets) (b) (c)
 
16.0

 
8.6

 
3.5

 
(0.2
)
 
(0.4
)
 
2.7

Unrealized Gain (Loss) Included in Net Income (or Changes in Net Assets) Relating to Assets Still Held at the Reporting Date (b)
 
2.9

 
—

 
—

 
—

 
—

 
—

Realized and Unrealized Gains (Losses) Included in Other Comprehensive Income
 
17.3

 
—

 
—

 
—

 
—

 
—

Purchases, Issuances and Settlements (d)
 
(17.5
)
 
(6.8
)
 
(4.6
)
 
1.7

 
(0.2
)
 
(3.5
)
Transfers into Level 3 (e) (f)
 
8.2

 
—

 
—

 
—

 
—

 
—

Changes in Fair Value Allocated to Regulated Jurisdictions (h)
 
(18.9
)
 
(17.3
)
 
0.9

 
(5.2
)
 
1.1

 
1.5

Balance as of June 30, 2016
 
$
149.3

 
$
(12.9
)
 
$
3.5

 
$
(14.6
)
 
$
1.1

 
$
1.4

Three Months Ended June 30, 2015
 
AEP
 
APCo
 
I&M
 
OPCo
 
PSO
 
SWEPCo
 
 
(in millions)
Balance as of March 31, 2015
 
$
130.6

 
$
6.0

 
$
5.6

 
$
45.9

 
$
(0.7
)
 
$
(1.2
)
Realized Gain (Loss) Included in Net Income (or Changes in Net Assets) (b) (c)
 
2.2

 
(1.4
)
 
(0.8
)
 
0.7

 
0.8

 
4.2

Unrealized Gain (Loss) Included in Net Income (or Changes in Net Assets) Relating to Assets Still Held at the Reporting Date (b)
 
12.4

 
—

 
—

 
—

 
—

 
—

Purchases, Issuances and Settlements (d)
 
(15.9
)
 
(1.6
)
 
(2.3
)
 
(1.7
)
 
(0.1
)
 
(3.0
)
Transfers into Level 3 (e) (f)
 
41.6

 
—

 
—

 
—

 
—

 
—

Transfers out of Level 3 (f) (g)
 
(1.8
)
 
1.2

 
0.8

 
—

 
—

 
—

Changes in Fair Value Allocated to Regulated Jurisdictions (h)
 
34.0

 
29.6

 
8.5

 
(7.2
)
 
1.7

 
2.0

Balance as of June 30, 2015
 
$
203.1

 
$
33.8

 
$
11.8

 
$
37.7

 
$
1.7

 
$
2.0

Six Months Ended June 30, 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)
 
41.3

 
25.1

 
6.7

 
(1.4
)
 
(1.0
)
 
7.7

Unrealized Gain (Loss) Included in Net Income (or Changes in Net Assets) Relating to Assets Still Held at the Reporting Date (b)
 
24.8

 
—

 
—

 
—

 
—

 
—

Realized and Unrealized Gains (Losses) Included in Other Comprehensive Income
 
18.8

 
—

 
—

 
—

 
—

 
—

Purchases, Issuances and Settlements (d)
 
(60.0
)
 
(34.5
)
 
(9.2
)
 
3.1

 
0.4

 
(8.4
)
Transfers into Level 3 (e) (f)
 
8.1

 
—

 
—

 
—

 
—

 
—

Transfers out of Level 3 (f) (g)
 
10.9

 
0.1

 
0.1

 
—

 
—

 
—

Changes in Fair Value Allocated to Regulated Jurisdictions (h)
 
(41.5
)
 
(15.3
)
 
1.6

 
(32.2
)
 
1.1

 
1.3

Balance as of June 30, 2016
 
$
149.3

 
$
(12.9
)
 
$
3.5

 
$
(14.6
)
 
$
1.1

 
$
1.4

Six Months Ended June 30, 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)
 
11.8

 
1.2

 
(0.9
)
 
1.6

 
(0.2
)
 
9.2

Unrealized Gain (Loss) Included in Net Income (or Changes in Net Assets) Relating to Assets Still Held at the Reporting Date (b)
 
51.4

 
—

 
—

 
—

 
—

 
—

Realized and Unrealized Gains (Losses) Included in Other Comprehensive Income
 
(1.9
)
 
—

 
—

 
—

 
—

 
—

Purchases, Issuances and Settlements (d)
 
(54.1
)
 
(15.0
)
 
(11.3
)
 
(8.4
)
 
0.5

 
(8.7
)
Transfers into Level 3 (e) (f)
 
20.8

 
—

 
—

 
—

 
—

 
—

Transfers out of Level 3 (f) (g)
 
(14.1
)
 
1.2

 
0.8

 
—

 
—

 
—

Changes in Fair Value Allocated to Regulated Jurisdictions (h)
 
38.4

 
30.6

 
8.5

 
(3.9
)
 
1.7

 
2.0

Balance as of June 30, 2015
 
$
203.1

 
$
33.8

 
$
11.8

 
$
37.7

 
$
1.7

 
$
2.0


(a)
Includes both affiliated and nonaffiliated transactions.
(b)
Included in revenues on the 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 statements of income.  These net gains (losses) are recorded as regulatory liabilities/assets.
Significant Unobservable Inputs for Level 3
Significant Unobservable Inputs
June 30, 2016
I&M
 
 
 
 
 
 
 
Significant
 
Forward Price Range
 
Fair Value
 
Valuation
 
Unobservable
 
 
 
 
 
Weighted
 
Assets
 
Liabilities
 
Technique
 
Input (a)
 
Low
 
High
 
Average
 
(in millions)
 
 
 
 
 
 
 
 
 
 
Energy Contracts
$
2.0

 
$
0.2

 
Discounted Cash Flow 
 
Forward Market Price 
 
$
10.20

 
$
50.27

 
$
35.25

FTRs
1.8

 
0.1

 
Discounted Cash Flow 
 
Forward Market Price 
 
(7.12
)
 
7.63

 
0.82

Total
$
3.8

 
$
0.3

 
 
 
 
 
 

 
 

 
 

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

 
 
 
 
 
 

 
 

 
 
(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.
Sensitivity of Fair Value Measurements
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]  
Book Values and Fair Values of Long-term Debt
 
 
June 30, 2016
 
December 31, 2015
Company
 
Book Value
 
Fair Value
 
Book Value
 
Fair Value
 
 
(in millions)
AEP
 
$
19,543.7

 
$
22,443.2

 
$
19,572.7

 
$
21,201.3

APCo
 
4,044.5

 
4,910.6

 
3,930.7

 
4,416.7

I&M
 
2,430.3

 
2,745.8

 
2,000.0

 
2,193.6

OPCo
 
1,786.0

 
2,220.0

 
2,157.7

 
2,472.7

PSO
 
1,286.4

 
1,481.8

 
1,286.1

 
1,402.9

SWEPCo
 
2,272.8

 
2,555.0

 
2,273.5

 
2,417.2
Fair Value, Assets and Liabilities Measured on Recurring Basis
(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 June 30, 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 periods 2017-2019;  Level 2 matures $5 million in 2016, $9 million in periods 2017-2019 and $2 million in periods 2020-2021;  Level 3 matures $5 million in 2016, $30 million in periods 2017-2019, $20 million in periods 2020-2021 and $76 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 the Registrant Subsidiaries.
OPCo

Assets and Liabilities Measured at Fair Value on a Recurring Basis
June 30, 2016
 
 
Level 1
 
Level 2
 
Level 3
 
Other
 
Total
Assets:
 
(in millions)
 
 
 
 
 
 
 
 
 
 
 
Restricted Cash for Securitized Funding (a)
 
$
—

 
$
—

 
$
—

 
$
27.2

 
$
27.2

 
 
 
 
 
 
 
 
 
 
 
Risk Management Assets
 
 

 
 

 
 

 
 

 
 

Risk Management Commodity Contracts (c) (g)
 
—

 
0.1

 
—

 
—

 
0.1

 
 
 
 
 
 
 
 
 
 
 
Total Assets
 
$
—

 
$
0.1

 
$
—

 
$
27.2

 
$
27.3

 
 
 
 
 
 
 
 
 
 
 
Liabilities:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Risk Management Liabilities
 
 
 
 
 
 
 
 
 
 
Risk Management Commodity Contracts (c) (g)
 
$
—

 
$
0.2

 
$
14.6

 
$
(0.1
)
 
$
14.7


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
Changes in Fair Value of Net Trading Derivatives and Other Investments
Three Months Ended June 30, 2016
 
AEP
 
APCo (a)
 
I&M (a)
 
OPCo
 
PSO
 
SWEPCo
 
 
(in millions)
Balance as of March 31, 2016
 
$
141.3

 
$
2.6

 
$
3.7

 
$
(10.9
)
 
$
0.6

 
$
0.7

Realized Gain (Loss) Included in Net Income (or Changes in Net Assets) (b) (c)
 
16.0

 
8.6

 
3.5

 
(0.2
)
 
(0.4
)
 
2.7

Unrealized Gain (Loss) Included in Net Income (or Changes in Net Assets) Relating to Assets Still Held at the Reporting Date (b)
 
2.9

 
—

 
—

 
—

 
—

 
—

Realized and Unrealized Gains (Losses) Included in Other Comprehensive Income
 
17.3

 
—

 
—

 
—

 
—

 
—

Purchases, Issuances and Settlements (d)
 
(17.5
)
 
(6.8
)
 
(4.6
)
 
1.7

 
(0.2
)
 
(3.5
)
Transfers into Level 3 (e) (f)
 
8.2

 
—

 
—

 
—

 
—

 
—

Changes in Fair Value Allocated to Regulated Jurisdictions (h)
 
(18.9
)
 
(17.3
)
 
0.9

 
(5.2
)
 
1.1

 
1.5

Balance as of June 30, 2016
 
$
149.3

 
$
(12.9
)
 
$
3.5

 
$
(14.6
)
 
$
1.1

 
$
1.4

Three Months Ended June 30, 2015
 
AEP
 
APCo
 
I&M
 
OPCo
 
PSO
 
SWEPCo
 
 
(in millions)
Balance as of March 31, 2015
 
$
130.6

 
$
6.0

 
$
5.6

 
$
45.9

 
$
(0.7
)
 
$
(1.2
)
Realized Gain (Loss) Included in Net Income (or Changes in Net Assets) (b) (c)
 
2.2

 
(1.4
)
 
(0.8
)
 
0.7

 
0.8

 
4.2

Unrealized Gain (Loss) Included in Net Income (or Changes in Net Assets) Relating to Assets Still Held at the Reporting Date (b)
 
12.4

 
—

 
—

 
—

 
—

 
—

Purchases, Issuances and Settlements (d)
 
(15.9
)
 
(1.6
)
 
(2.3
)
 
(1.7
)
 
(0.1
)
 
(3.0
)
Transfers into Level 3 (e) (f)
 
41.6

 
—

 
—

 
—

 
—

 
—

Transfers out of Level 3 (f) (g)
 
(1.8
)
 
1.2

 
0.8

 
—

 
—

 
—

Changes in Fair Value Allocated to Regulated Jurisdictions (h)
 
34.0

 
29.6

 
8.5

 
(7.2
)
 
1.7

 
2.0

Balance as of June 30, 2015
 
$
203.1

 
$
33.8

 
$
11.8

 
$
37.7

 
$
1.7

 
$
2.0

Six Months Ended June 30, 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)
 
41.3

 
25.1

 
6.7

 
(1.4
)
 
(1.0
)
 
7.7

Unrealized Gain (Loss) Included in Net Income (or Changes in Net Assets) Relating to Assets Still Held at the Reporting Date (b)
 
24.8

 
—

 
—

 
—

 
—

 
—

Realized and Unrealized Gains (Losses) Included in Other Comprehensive Income
 
18.8

 
—

 
—

 
—

 
—

 
—

Purchases, Issuances and Settlements (d)
 
(60.0
)
 
(34.5
)
 
(9.2
)
 
3.1

 
0.4

 
(8.4
)
Transfers into Level 3 (e) (f)
 
8.1

 
—

 
—

 
—

 
—

 
—

Transfers out of Level 3 (f) (g)
 
10.9

 
0.1

 
0.1

 
—

 
—

 
—

Changes in Fair Value Allocated to Regulated Jurisdictions (h)
 
(41.5
)
 
(15.3
)
 
1.6

 
(32.2
)
 
1.1

 
1.3

Balance as of June 30, 2016
 
$
149.3

 
$
(12.9
)
 
$
3.5

 
$
(14.6
)
 
$
1.1

 
$
1.4

Six Months Ended June 30, 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)
 
11.8

 
1.2

 
(0.9
)
 
1.6

 
(0.2
)
 
9.2

Unrealized Gain (Loss) Included in Net Income (or Changes in Net Assets) Relating to Assets Still Held at the Reporting Date (b)
 
51.4

 
—

 
—

 
—

 
—

 
—

Realized and Unrealized Gains (Losses) Included in Other Comprehensive Income
 
(1.9
)
 
—

 
—

 
—

 
—

 
—

Purchases, Issuances and Settlements (d)
 
(54.1
)
 
(15.0
)
 
(11.3
)
 
(8.4
)
 
0.5

 
(8.7
)
Transfers into Level 3 (e) (f)
 
20.8

 
—

 
—

 
—

 
—

 
—

Transfers out of Level 3 (f) (g)
 
(14.1
)
 
1.2

 
0.8

 
—

 
—

 
—

Changes in Fair Value Allocated to Regulated Jurisdictions (h)
 
38.4

 
30.6

 
8.5

 
(3.9
)
 
1.7

 
2.0

Balance as of June 30, 2015
 
$
203.1

 
$
33.8

 
$
11.8

 
$
37.7

 
$
1.7

 
$
2.0


(a)
Includes both affiliated and nonaffiliated transactions.
(b)
Included in revenues on the 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 statements of income.  These net gains (losses) are recorded as regulatory liabilities/assets.
Significant Unobservable Inputs for Level 3
Significant Unobservable Inputs
June 30, 2016
OPCo
 
 
 
 
 
 
 
Significant
 
Forward Price Range
 
Fair Value
 
Valuation
 
Unobservable
 
 
 
 
 
Weighted
 
Assets
 
Liabilities
 
Technique
 
Input
 
Low
 
High
 
Average
 
(in millions)
 
 
 
 
 
 
 
 
 
 
Energy Contracts
$
—

 
$
14.6

 
Discounted Cash Flow 
 
Forward Market Price (a)
 
$
28.26

 
$
162.36

 
$
83.20

 
 
 
 
 
 
 
Counterparty Credit Risk (b)
 
172
Total
$
—

 
$
14.6

 
 
 
 
 
 
 
 
 
 

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

(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.
Sensitivity of Fair Value Measurements
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]  
Book Values and Fair Values of Long-term Debt
 
 
June 30, 2016
 
December 31, 2015
Company
 
Book Value
 
Fair Value
 
Book Value
 
Fair Value
 
 
(in millions)
AEP
 
$
19,543.7

 
$
22,443.2

 
$
19,572.7

 
$
21,201.3

APCo
 
4,044.5

 
4,910.6

 
3,930.7

 
4,416.7

I&M
 
2,430.3

 
2,745.8

 
2,000.0

 
2,193.6

OPCo
 
1,786.0

 
2,220.0

 
2,157.7

 
2,472.7

PSO
 
1,286.4

 
1,481.8

 
1,286.1

 
1,402.9

SWEPCo
 
2,272.8

 
2,555.0

 
2,273.5

 
2,417.2
Fair Value, Assets and Liabilities Measured on Recurring Basis
(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 June 30, 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 periods 2017-2019;  Level 2 matures $5 million in 2016, $9 million in periods 2017-2019 and $2 million in periods 2020-2021;  Level 3 matures $5 million in 2016, $30 million in periods 2017-2019, $20 million in periods 2020-2021 and $76 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 the Registrant Subsidiaries.
PSO

Assets and Liabilities Measured at Fair Value on a Recurring Basis
June 30, 2016
 
 
Level 1
 
Level 2
 
Level 3
 
Other
 
Total
Assets:
 
(in millions)
 
 
 
 
 
 
 
 
 
 
 
Risk Management Assets
 
 

 
 

 
 

 
 

 
 

Risk Management Commodity Contracts (c) (g)
 
$
—

 
$
0.1

 
$
1.2

 
$
(0.1
)
 
$
1.2

 
 
 
 
 
 
 
 
 
 
 
Liabilities:
 
 

 
 

 
 

 
 

 
 

 
 
 
 
 
 
 
 
 
 
 
Risk Management Liabilities
 
 

 
 

 
 

 
 

 
 

Risk Management Commodity Contracts (c) (g)
 
$
—

 
$
0.1

 
$
0.1

 
$
(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
Changes in Fair Value of Net Trading Derivatives and Other Investments
Three Months Ended June 30, 2016
 
AEP
 
APCo (a)
 
I&M (a)
 
OPCo
 
PSO
 
SWEPCo
 
 
(in millions)
Balance as of March 31, 2016
 
$
141.3

 
$
2.6

 
$
3.7

 
$
(10.9
)
 
$
0.6

 
$
0.7

Realized Gain (Loss) Included in Net Income (or Changes in Net Assets) (b) (c)
 
16.0

 
8.6

 
3.5

 
(0.2
)
 
(0.4
)
 
2.7

Unrealized Gain (Loss) Included in Net Income (or Changes in Net Assets) Relating to Assets Still Held at the Reporting Date (b)
 
2.9

 
—

 
—

 
—

 
—

 
—

Realized and Unrealized Gains (Losses) Included in Other Comprehensive Income
 
17.3

 
—

 
—

 
—

 
—

 
—

Purchases, Issuances and Settlements (d)
 
(17.5
)
 
(6.8
)
 
(4.6
)
 
1.7

 
(0.2
)
 
(3.5
)
Transfers into Level 3 (e) (f)
 
8.2

 
—

 
—

 
—

 
—

 
—

Changes in Fair Value Allocated to Regulated Jurisdictions (h)
 
(18.9
)
 
(17.3
)
 
0.9

 
(5.2
)
 
1.1

 
1.5

Balance as of June 30, 2016
 
$
149.3

 
$
(12.9
)
 
$
3.5

 
$
(14.6
)
 
$
1.1

 
$
1.4

Three Months Ended June 30, 2015
 
AEP
 
APCo
 
I&M
 
OPCo
 
PSO
 
SWEPCo
 
 
(in millions)
Balance as of March 31, 2015
 
$
130.6

 
$
6.0

 
$
5.6

 
$
45.9

 
$
(0.7
)
 
$
(1.2
)
Realized Gain (Loss) Included in Net Income (or Changes in Net Assets) (b) (c)
 
2.2

 
(1.4
)
 
(0.8
)
 
0.7

 
0.8

 
4.2

Unrealized Gain (Loss) Included in Net Income (or Changes in Net Assets) Relating to Assets Still Held at the Reporting Date (b)
 
12.4

 
—

 
—

 
—

 
—

 
—

Purchases, Issuances and Settlements (d)
 
(15.9
)
 
(1.6
)
 
(2.3
)
 
(1.7
)
 
(0.1
)
 
(3.0
)
Transfers into Level 3 (e) (f)
 
41.6

 
—

 
—

 
—

 
—

 
—

Transfers out of Level 3 (f) (g)
 
(1.8
)
 
1.2

 
0.8

 
—

 
—

 
—

Changes in Fair Value Allocated to Regulated Jurisdictions (h)
 
34.0

 
29.6

 
8.5

 
(7.2
)
 
1.7

 
2.0

Balance as of June 30, 2015
 
$
203.1

 
$
33.8

 
$
11.8

 
$
37.7

 
$
1.7

 
$
2.0

Six Months Ended June 30, 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)
 
41.3

 
25.1

 
6.7

 
(1.4
)
 
(1.0
)
 
7.7

Unrealized Gain (Loss) Included in Net Income (or Changes in Net Assets) Relating to Assets Still Held at the Reporting Date (b)
 
24.8

 
—

 
—

 
—

 
—

 
—

Realized and Unrealized Gains (Losses) Included in Other Comprehensive Income
 
18.8

 
—

 
—

 
—

 
—

 
—

Purchases, Issuances and Settlements (d)
 
(60.0
)
 
(34.5
)
 
(9.2
)
 
3.1

 
0.4

 
(8.4
)
Transfers into Level 3 (e) (f)
 
8.1

 
—

 
—

 
—

 
—

 
—

Transfers out of Level 3 (f) (g)
 
10.9

 
0.1

 
0.1

 
—

 
—

 
—

Changes in Fair Value Allocated to Regulated Jurisdictions (h)
 
(41.5
)
 
(15.3
)
 
1.6

 
(32.2
)
 
1.1

 
1.3

Balance as of June 30, 2016
 
$
149.3

 
$
(12.9
)
 
$
3.5

 
$
(14.6
)
 
$
1.1

 
$
1.4

Six Months Ended June 30, 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)
 
11.8

 
1.2

 
(0.9
)
 
1.6

 
(0.2
)
 
9.2

Unrealized Gain (Loss) Included in Net Income (or Changes in Net Assets) Relating to Assets Still Held at the Reporting Date (b)
 
51.4

 
—

 
—

 
—

 
—

 
—

Realized and Unrealized Gains (Losses) Included in Other Comprehensive Income
 
(1.9
)
 
—

 
—

 
—

 
—

 
—

Purchases, Issuances and Settlements (d)
 
(54.1
)
 
(15.0
)
 
(11.3
)
 
(8.4
)
 
0.5

 
(8.7
)
Transfers into Level 3 (e) (f)
 
20.8

 
—

 
—

 
—

 
—

 
—

Transfers out of Level 3 (f) (g)
 
(14.1
)
 
1.2

 
0.8

 
—

 
—

 
—

Changes in Fair Value Allocated to Regulated Jurisdictions (h)
 
38.4

 
30.6

 
8.5

 
(3.9
)
 
1.7

 
2.0

Balance as of June 30, 2015
 
$
203.1

 
$
33.8

 
$
11.8

 
$
37.7

 
$
1.7

 
$
2.0


(a)
Includes both affiliated and nonaffiliated transactions.
(b)
Included in revenues on the 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 statements of income.  These net gains (losses) are recorded as regulatory liabilities/assets.
Significant Unobservable Inputs for Level 3
(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.
Significant Unobservable Inputs
June 30, 2016
PSO
 
 
 
 
 
 
 
Significant
 
Forward Price Range
 
Fair Value
 
Valuation
 
Unobservable
 
 
 
 
 
Weighted
 
Assets
 
Liabilities
 
Technique
 
Input (a)
 
Low
 
High
 
Average
 
(in millions)
 
 
 
 
 
 
 
 
 
 
FTRs
$
1.2

 
$
0.1

 
Discounted Cash Flow 
 
Forward Market Price 
 
$
(7.10
)
 
$
0.22

 
$
(0.34
)

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
Sensitivity of Fair Value Measurements
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]  
Book Values and Fair Values of Long-term Debt
 
 
June 30, 2016
 
December 31, 2015
Company
 
Book Value
 
Fair Value
 
Book Value
 
Fair Value
 
 
(in millions)
AEP
 
$
19,543.7

 
$
22,443.2

 
$
19,572.7

 
$
21,201.3

APCo
 
4,044.5

 
4,910.6

 
3,930.7

 
4,416.7

I&M
 
2,430.3

 
2,745.8

 
2,000.0

 
2,193.6

OPCo
 
1,786.0

 
2,220.0

 
2,157.7

 
2,472.7

PSO
 
1,286.4

 
1,481.8

 
1,286.1

 
1,402.9

SWEPCo
 
2,272.8

 
2,555.0

 
2,273.5

 
2,417.2
Fair Value, Assets and Liabilities Measured on Recurring Basis
SWEPCo

Assets and Liabilities Measured at Fair Value on a Recurring Basis
June 30, 2016
 
 
Level 1
 
Level 2
 
Level 3
 
Other
 
Total
Assets:
 
(in millions)
 
 
 
 
 
 
 
 
 
 
 
Cash and Cash Equivalents (a)
 
$
10.8

 
$
—

 
$
—

 
$
3.2

 
$
14.0

 
 
 
 
 
 
 
 
 
 
 
Risk Management Assets
 
 

 
 

 
 

 
 

 
 

Risk Management Commodity Contracts (c) (g)
 
—

 
0.1

 
1.5

 
(0.2
)
 
1.4

 
 
 
 
 
 
 
 
 
 
 
Total Assets
 
$
10.8

 
$
0.1

 
$
1.5

 
$
3.0

 
$
15.4

 
 
 
 
 
 
 
 
 
 
 
Liabilities:
 
 

 
 

 
 

 
 

 
 

 
 
 
 
 
 
 
 
 
 
 
Risk Management Liabilities
 
 

 
 

 
 

 
 

 
 

Risk Management Commodity Contracts (c) (g)
 
$
—

 
$
2.9

 
$
0.1

 
$
(0.3
)
 
$
2.7


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 June 30, 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 periods 2017-2019;  Level 2 matures $5 million in 2016, $9 million in periods 2017-2019 and $2 million in periods 2020-2021;  Level 3 matures $5 million in 2016, $30 million in periods 2017-2019, $20 million in periods 2020-2021 and $76 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 the Registrant Subsidiaries.
Changes in Fair Value of Net Trading Derivatives and Other Investments
Three Months Ended June 30, 2016
 
AEP
 
APCo (a)
 
I&M (a)
 
OPCo
 
PSO
 
SWEPCo
 
 
(in millions)
Balance as of March 31, 2016
 
$
141.3

 
$
2.6

 
$
3.7

 
$
(10.9
)
 
$
0.6

 
$
0.7

Realized Gain (Loss) Included in Net Income (or Changes in Net Assets) (b) (c)
 
16.0

 
8.6

 
3.5

 
(0.2
)
 
(0.4
)
 
2.7

Unrealized Gain (Loss) Included in Net Income (or Changes in Net Assets) Relating to Assets Still Held at the Reporting Date (b)
 
2.9

 
—

 
—

 
—

 
—

 
—

Realized and Unrealized Gains (Losses) Included in Other Comprehensive Income
 
17.3

 
—

 
—

 
—

 
—

 
—

Purchases, Issuances and Settlements (d)
 
(17.5
)
 
(6.8
)
 
(4.6
)
 
1.7

 
(0.2
)
 
(3.5
)
Transfers into Level 3 (e) (f)
 
8.2

 
—

 
—

 
—

 
—

 
—

Changes in Fair Value Allocated to Regulated Jurisdictions (h)
 
(18.9
)
 
(17.3
)
 
0.9

 
(5.2
)
 
1.1

 
1.5

Balance as of June 30, 2016
 
$
149.3

 
$
(12.9
)
 
$
3.5

 
$
(14.6
)
 
$
1.1

 
$
1.4

Three Months Ended June 30, 2015
 
AEP
 
APCo
 
I&M
 
OPCo
 
PSO
 
SWEPCo
 
 
(in millions)
Balance as of March 31, 2015
 
$
130.6

 
$
6.0

 
$
5.6

 
$
45.9

 
$
(0.7
)
 
$
(1.2
)
Realized Gain (Loss) Included in Net Income (or Changes in Net Assets) (b) (c)
 
2.2

 
(1.4
)
 
(0.8
)
 
0.7

 
0.8

 
4.2

Unrealized Gain (Loss) Included in Net Income (or Changes in Net Assets) Relating to Assets Still Held at the Reporting Date (b)
 
12.4

 
—

 
—

 
—

 
—

 
—

Purchases, Issuances and Settlements (d)
 
(15.9
)
 
(1.6
)
 
(2.3
)
 
(1.7
)
 
(0.1
)
 
(3.0
)
Transfers into Level 3 (e) (f)
 
41.6

 
—

 
—

 
—

 
—

 
—

Transfers out of Level 3 (f) (g)
 
(1.8
)
 
1.2

 
0.8

 
—

 
—

 
—

Changes in Fair Value Allocated to Regulated Jurisdictions (h)
 
34.0

 
29.6

 
8.5

 
(7.2
)
 
1.7

 
2.0

Balance as of June 30, 2015
 
$
203.1

 
$
33.8

 
$
11.8

 
$
37.7

 
$
1.7

 
$
2.0

Six Months Ended June 30, 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)
 
41.3

 
25.1

 
6.7

 
(1.4
)
 
(1.0
)
 
7.7

Unrealized Gain (Loss) Included in Net Income (or Changes in Net Assets) Relating to Assets Still Held at the Reporting Date (b)
 
24.8

 
—

 
—

 
—

 
—

 
—

Realized and Unrealized Gains (Losses) Included in Other Comprehensive Income
 
18.8

 
—

 
—

 
—

 
—

 
—

Purchases, Issuances and Settlements (d)
 
(60.0
)
 
(34.5
)
 
(9.2
)
 
3.1

 
0.4

 
(8.4
)
Transfers into Level 3 (e) (f)
 
8.1

 
—

 
—

 
—

 
—

 
—

Transfers out of Level 3 (f) (g)
 
10.9

 
0.1

 
0.1

 
—

 
—

 
—

Changes in Fair Value Allocated to Regulated Jurisdictions (h)
 
(41.5
)
 
(15.3
)
 
1.6

 
(32.2
)
 
1.1

 
1.3

Balance as of June 30, 2016
 
$
149.3

 
$
(12.9
)
 
$
3.5

 
$
(14.6
)
 
$
1.1

 
$
1.4

Six Months Ended June 30, 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)
 
11.8

 
1.2

 
(0.9
)
 
1.6

 
(0.2
)
 
9.2

Unrealized Gain (Loss) Included in Net Income (or Changes in Net Assets) Relating to Assets Still Held at the Reporting Date (b)
 
51.4

 
—

 
—

 
—

 
—

 
—

Realized and Unrealized Gains (Losses) Included in Other Comprehensive Income
 
(1.9
)
 
—

 
—

 
—

 
—

 
—

Purchases, Issuances and Settlements (d)
 
(54.1
)
 
(15.0
)
 
(11.3
)
 
(8.4
)
 
0.5

 
(8.7
)
Transfers into Level 3 (e) (f)
 
20.8

 
—

 
—

 
—

 
—

 
—

Transfers out of Level 3 (f) (g)
 
(14.1
)
 
1.2

 
0.8

 
—

 
—

 
—

Changes in Fair Value Allocated to Regulated Jurisdictions (h)
 
38.4

 
30.6

 
8.5

 
(3.9
)
 
1.7

 
2.0

Balance as of June 30, 2015
 
$
203.1

 
$
33.8

 
$
11.8

 
$
37.7

 
$
1.7

 
$
2.0


(a)
Includes both affiliated and nonaffiliated transactions.
(b)
Included in revenues on the 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 statements of income.  These net gains (losses) are recorded as regulatory liabilities/assets.
Significant Unobservable Inputs for Level 3
Significant Unobservable Inputs
June 30, 2016
SWEPCo
 
 
 
 
 
 
 
Significant
 
Forward Price Range
 
Fair Value
 
Valuation
 
Unobservable
 
 
 
 
 
Weighted
 
Assets
 
Liabilities
 
Technique
 
Input (a)
 
Low
 
High
 
Average
 
(in millions)
 
 
 
 
 
 
 
 
 
 
FTRs
$
1.5

 
$
0.1

 
Discounted Cash Flow 
 
Forward Market Price 
 
$
(7.10
)
 
$
0.22

 
$
(0.34
)

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.
Sensitivity of Fair Value Measurements
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)