Financing Activities (Tables)

12 Months Ended

Dec. 31, 2017

AEP Common Stock

Shares of AEP Common Stock	Issued	Held in Treasury
Balance, December 31, 2014	509,739,159	20,336,592
Issued	1,650,014	—
Balance, December 31, 2015	511,389,173	20,336,592
Issued	659,347	—
Balance, December 31, 2016	512,048,520	20,336,592
Issued	162,124	—
Treasury Stock Reissued	—	(131,546	)	(a)
Balance, December 31, 2017	512,210,644	20,205,046

(a) Reissued Treasury Stock used to fulfill share commitments related to AEP’s Share-based Compensation. See “Shared-based Compensation Plans” section of Note 15 for additional information.

Long-term Debt

		Weighted Average	Interest Rate Ranges as of		Outstanding as of
		Interest Rate as of	December 31,		December 31,
Company	Maturity	December 31, 2017	2017	2016	2017		2016
AEP					(in millions)
Senior Unsecured Notes	2017-2047	4.62%	2.15%-8.13%	1.65%-8.13%	$	16,478.3	$	14,761.0	(f)
Pollution Control Bonds (a)	2017-2042 (b)	3.06%	1.54%-6.30%	0.69%-6.30%	1,621.7		1,725.1
Notes Payable – Nonaffiliated (c)	2017-2032	3.00%	2.03%-6.37%	1.456%-6.37%	260.8		326.9
Securitization Bonds	2017-2028 (d)	3.70%	1.98%-5.31%	0.88%-5.31%	1,416.5		1,705.0
Spent Nuclear Fuel Obligation (e)					268.6		266.3
Other Long-term Debt	2017-2059	2.75%	1.15%-13.718%	1.15%-13.718%	1,127.4		1,606.9
Total Long-term Debt Outstanding					$	21,173.3	$	20,391.2	(f)
AEP Texas
Senior Unsecured Notes	2018-2047	4.12%	2.40%-6.76%	2.61%-6.76%	$	1,932.2	$	1,241.3
Pollution Control Bonds (a)	2017-2030	4.39%	1.75%-6.30%	4.00%-6.30%	490.5		530.3
Securitization Bonds	2017-2024 (d)	4.05%	1.98%-5.31%	0.88%-5.31%	1,026.1		1,245.8
Other Long-term Debt	2019-2059	2.76%	2.75%-4.50%	2.438%-4.50%	200.5		200.3
Total Long-term Debt Outstanding					$	3,649.3	$	3,217.7
AEPTCo
Senior Unsecured Notes	2018-2047	3.85%	2.68%-5.52%	2.68%-5.52%	$	2,550.4	$	1,932.0
Total Long-term Debt Outstanding					$	2,550.4	$	1,932.0
APCo
Senior Unsecured Notes	2017-2045	5.20%	3.30%-7.00%	3.40%-7.00%	$	3,045.1	$	2,972.4
Pollution Control Bonds (a)	2018-2042 (b)	2.44%	1.625%-5.38%	0.69%-5.38%	512.2		615.8
Securitization Bonds	2023-2028 (d)	2.98%	2.008%-3.772%	2.008%-3.772%	295.9		318.9
Other Long-term Debt	2019-2026	2.92%	2.73%-13.718%	2.06%-13.718%	126.9		126.8
Total Long-term Debt Outstanding					$	3,980.1	$	4,033.9
I&M
Senior Unsecured Notes	2019-2047	5.20%	3.20%-7.00%	3.20%-7.00%	$	1,809.0	$	1,512.8
Pollution Control Bonds (a)	2018-2025 (b)	2.02%	1.75%-2.75%	0.74%-4.625%	264.6		225.4
Notes Payable – Nonaffiliated (c)	2017-2022	2.15%	2.03%-2.19%	1.456%-1.81%	188.6		251.4
Spent Nuclear Fuel Obligation (e)					268.6		266.3
Other Long-term Debt	2018-2025	3.03%	2.82%-6.00%	2.15%-6.00%	214.3		215.5
Total Long-term Debt Outstanding					$	2,745.1	$	2,471.4
OPCo
Senior Unsecured Notes	2018-2035	5.98%	5.375%-6.60%	5.375%-6.60%	$	1,591.4	$	1,590.2
Pollution Control Bonds	2038	5.80%	5.80%	5.80%	32.3		32.3
Securitization Bonds	2018-2019 (d)	2.049%	2.049%	0.958%-2.049%	94.5		140.2
Other Long-term Debt	2028	1.15%	1.15%	1.15%	1.1		1.2
Total Long-term Debt Outstanding					$	1,719.3	$	1,763.9
PSO
Senior Unsecured Notes	2019-2046	4.80%	3.05%-6.625%	3.05%-6.625%	$	1,144.1	$	1,143.2
Pollution Control Bonds (a)	2020	4.45%	4.45%	4.45%	12.6		12.6
Other Long-term Debt	2019-2027	2.60%	2.584%-3.00%	1.92%-3.00%	129.8		130.2
Total Long-term Debt Outstanding					$	1,286.5	$	1,286.0
SWEPCo
Senior Unsecured Notes	2017-2045	4.78%	2.75%-6.45%	2.75%-6.45%	$	2,110.7	$	2,359.2
Pollution Control Bonds (a)	2018-2019	3.62%	1.60%-4.95%	1.60%-4.95%	135.1		134.9
Notes Payable – Nonaffiliated (c)	2024-2032	5.20%	4.58%-6.37%	4.58%-6.37%	72.1		75.3
Other Long-term Debt	2017-2023	3.00%	2.925%-4.28%	2.346%-4.28%	124.0		109.7
Total Long-term Debt Outstanding					$	2,441.9	$	2,679.1

(a) For certain series of pollution control bonds, interest rates are subject to periodic adjustment.  Certain series may be purchased on demand at periodic interest adjustment dates.  Letters of credit from banks and insurance policies support certain series.

(b) Certain pollution control bonds are subject to redemption earlier than the maturity date.  Consequently, these bonds have been classified for maturity purposes as Long-term Debt Due Within One Year - Nonaffiliated on the balance sheets.

(c) Notes payable represent outstanding promissory notes issued under term loan agreements and credit agreements with a number of banks and other financial institutions. At expiration, all notes then issued and outstanding are due and payable. Interest rates are both fixed and variable. Variable rates generally relate to specified short-term interest rates.

(d) Dates represent the scheduled final payment dates for the securitization bonds. The legal maturity date is one to two years later. These bonds have been classified for maturity and repayment purposes based on the scheduled final payment date.

(e) Spent nuclear fuel obligation consists of a liability along with accrued interest for disposal of spent nuclear fuel (see “SNF Disposal” section of Note 6).

(f) Amounts include debt related to the Lawrenceburg Plant that has been classified as Liabilities Held for Sale on the balance sheet. See “Gavin, Waterford, Darby and Lawrenceburg Plants (Generation & Marketing Segment)” section of Note 7 for additional information.

Long-term Debt 5-Year Maturity

	AEP			AEP Texas			AEPTCo			APCo			I&M			OPCo			PSO			SWEPCo
	(in millions)
2018	$	1,753.7		$	266.1		$	50.0		$	249.2		$	474.7		$	397.0		$	0.5		$	3.7
2019	2,307.9			501.1			85.0			305.4			535.2			48.0			375.5			457.2
2020	1,322.0			377.7			—			90.3			26.4			0.1			13.2			118.7
2021	1,352.9			66.2			50.0			393.0			49.9			500.1			250.5			3.7
2022	1,318.4			493.1			104.0			26.0			3.5			0.1			0.5			278.7
After 2022	13,265.7			1,970.5			2,286.0			2,951.0			1,673.9			782.9			652.5			1,594.9
Principal Amount	21,320.6			3,674.7			2,575.0			4,014.9			2,763.6			1,728.2			1,292.7			2,456.9
Unamortized Discount, Net and Debt Issuance Costs	(147.3		)	(25.4		)	(24.6		)	(34.8		)	(18.5		)	(8.9		)	(6.2		)	(15.0		)
Total Long-term Debt Outstanding	$	21,173.3		$	3,649.3		$	2,550.4		$	3,980.1		$	2,745.1		$	1,719.3		$	1,286.5		$	2,441.9

Dividend Payment Restrictions

	AEP			AEP Texas		AEPTCo		APCo		I&M		OPCo		PSO		SWEPCo
	(in millions)
Restricted Retained Earnings	$	1,375.6	(a)	$	219.6	$	—	$	—	$	416.2	$	—	$	173.5	$	470.6

(a) Includes the restrictions of consolidated and unconsolidated subsidiaries.

Lines of Credit and Short-term Debt

		December 31,
		2017				2016
Company	Type of Debt	Outstanding Amount		Interest Rate (a)		Outstanding Amount		Interest Rate (a)
		(in millions)				(in millions)
AEP	Securitized Debt for Receivables (b)	$	718.0	1.22	%	$	673.0	0.70	%
AEP	Commercial Paper	898.6		1.85	%	1,040.0		1.02	%
SWEPCo	Notes Payable	22.0		2.92	%	—		—	%
	Total Short-term Debt	$	1,638.6			$	1,713.0

(a) Weighted average rate.

(b) Amount of securitized debt for receivables as accounted for under the “Transfers and Servicing” accounting guidance.

Utility Money Pool Participants' Money Pool Activity and Authorized Borrowing Limits

Year Ended December 31, 2017:

	Maximum				Average				Net Loans to
	Borrowings		Maximum		Borrowings		Average		(Borrowings from)			Authorized
	from the		Loans to the		from the		Loans to the		the Utility Money			Short-term
	Utility		Utility		Utility		Utility		Pool as of			Borrowing
Company	Money Pool		Money Pool		Money Pool		Money Pool		December 31, 2017			Limit
	(in millions)
AEP Texas	$	296.0	$	451.7	$	194.8	$	264.6	$	103.5		$	400.0
AEPTCo	467.2		268.0		180.5		119.8		109.2			795.0		(a)
APCo	231.5		160.7		144.3		30.0		(162.5		)	600.0
I&M	367.4		12.6		204.9		12.6		(199.2		)	500.0
OPCo	280.6		56.2		137.0		27.9		(87.8		)	400.0
PSO	185.2		—		119.3		—		(149.6		)	300.0
SWEPCo	187.5		178.6		95.5		169.5		(118.7		)	350.0

Year Ended December 31, 2016:

	Maximum				Average					Net Loans to
	Borrowings		Maximum		Borrowings			Average		(Borrowings from)			Authorized
	from the		Loans to the		from the			Loans to the		the Utility Money			Short-term
	Utility		Utility		Utility			Utility		Pool as of			Borrowing
Company	Money Pool		Money Pool		Money Pool			Money Pool		December 31, 2016			Limit
	(in millions)
AEP Texas	$	176.9	$	138.9	$	87.5		$	79.8	$	(174.5	)	$	400.0
AEPTCo	363.4		82.0		153.7		—	14.6		49.8			795.0		(a)
APCo	286.9		25.7		148.0			24.8		(55.5		)	600.0
I&M	369.1		97.6		129.9			19.5		(202.7		)	500.0
OPCo	227.9		379.2		116.6			182.4		24.2			400.0
PSO	52.0		205.4		12.9			48.1		(52.0		)	300.0
SWEPCo	249.4		313.3		171.8			267.7		167.8			350.0

(a) Amount represents the combined authorized short-term borrowing limit the State Transcos have from FERC or state regulatory commissions.

Nonutility Money Pool Activity

Year Ended December 31, 2017:

	Maximum		Maximum		Average		Average		Net Loans to
	Borrowings from		Loans to the		Borrowings from		Loans to the		the Nonutility
	the Nonutility		Nonutility		the Nonutility		Nonutility		Money Pool as of
Company	Money Pool		Money Pool		Money Pool		Money Pool		December 31, 2017
	(in millions)
AEP Texas	$	—	$	8.6	$	—	$	8.3	$	8.4
SWEPCo	—		2.0		—		2.0		2.0

Year Ended December 31, 2016:

	Maximum		Maximum		Average		Average		Net Loans to
	Borrowings from		Loans to the		Borrowings from		Loans to the		the Nonutility
	the Nonutility		Nonutility		the Nonutility		Nonutility		Money Pool as of
Company	Money Pool		Money Pool		Money Pool		Money Pool		December 31, 2016
	(in millions)
AEP Texas (a)	$	12.5	$	27.0	$	12.0	$	12.3	$	8.6
SWEPCo	—		2.0		—		2.0		2.0

(a) Amounts include short-term loans and (borrowings) related to Wind Farms that have been classified as Assets and Liabilities From Discontinued Operations, which were transferred to a competitive AEP Affiliate in December 2016. See Note 7 for additional information.

Direct Borrowing Activity

Year Ended December 31, 2017:

									Borrowings
									from		Loans to		Authorized
	Maximum		Maximum		Average		Average		AEP as of		AEP as of		Short-term
	Borrowings		Loans		Borrowings		Loans		December 31,		December 31,		Borrowing
Company	from AEP		to AEP		from AEP		to AEP		2017		2017		Limit
	(in millions)
AEP Texas	$	—	$	—	$	—	$	—	$	—	$	—	$	—
AEPTCo	4.1		151.9		1.1		39.3		1.1		22.5		75.0		(b)

Year Ended December 31, 2016:

									Borrowings
									from		Loans to		Authorized
	Maximum		Maximum		Average		Average		AEP as of		AEP as of		Short-term
	Borrowings		Loans		Borrowings		Loans		December 31,		December 31,		Borrowing
Company	from AEP		to AEP		from AEP		to AEP		2016		2016		Limit
	(in millions)
AEP Texas (a)	$	55.0	$	5.0	$	42.5	$	5.0	$	—	$	5.0	$	—
AEPTCo	5.6		170.4		1.0		35.7		1.0		14.2		75.0		(b)

(a) Amounts include short-term loans and (borrowings) related to Wind Farms that have been classified as Assets and Liabilities From Discontinued Operations, which were transferred to a competitive AEP Affiliate in December 2016. See Note 7 for additional information.

(b) Amount represents the combined authorized short-term borrowing limit the State Transcos have from FERC or state regulatory commissions.

Maximum and Minimum Interest Rates for Funds Either Borrowed from or Loaned to Utility Money Pool

	Years Ended December 31,
	2017		2016		2015
Maximum Interest Rate	1.85	%	1.02	%	0.87	%
Minimum Interest Rate	0.92	%	0.69	%	0.37	%

Average Interest Rates for Funds Borrowed from and Loaned to Utility Money Pool

	Average Interest Rate  for Funds Borrowed from the Utility Money Pool for Years Ended December 31,						Average Interest Rate  for Funds Loaned to the Utility Money Pool for Years Ended December 31,
Company	2017		2016		2015		2017		2016		2015
AEP Texas	1.29	%	0.88	%	0.46	%	1.26	%	0.72	%	0.52	%
AEPTCo	1.36	%	0.85	%	0.46	%	1.27	%	0.83	%	0.49	%
APCo	1.28	%	0.80	%	0.53	%	1.29	%	0.82	%	0.47	%
I&M	1.27	%	0.80	%	0.49	%	1.29	%	0.80	%	0.48	%
OPCo	1.37	%	0.85	%	—	%	0.98	%	0.74	%	0.48	%
PSO	1.32	%	0.96	%	0.49	%	—	%	0.83	%	0.48	%
SWEPCo	1.28	%	0.79	%	0.53	%	0.98	%	0.90	%	0.48	%

Maximum, Minimum and Average Interest Rates for Funds Borrowed from and Loaned to the Nonutility Money Pool

Year Ended December 31, 2017:

Maximum

Minimum

Maximum

Minimum

Average

Average

Interest Rate

Interest Rate

Interest Rate

Interest Rate

Interest Rate

Interest Rate

for Funds

for Funds

for Funds

for Funds

for Funds

for Funds

Borrowed from

Borrowed from

Loaned to

Loaned to

Borrowed from

Loaned to

the Nonutility

the Nonutility

the Nonutility

the Nonutility

the Nonutility

the Nonutility

Company

Money Pool

Money Pool

Money Pool

Money Pool

Money Pool

Money Pool

AEP Texas

—

%

—

%

1.85

%

—

%

—

%

1.32

%

SWEPCo

—

%

—

%

1.85

%

—

%

—

%

1.32

%

Year Ended December 31, 2016:

Maximum

Minimum

Maximum

Minimum

Average

Average

Interest Rate

Interest Rate

Interest Rate

Interest Rate

Interest Rate

Interest Rate

for Funds

for Funds

for Funds

for Funds

for Funds

for Funds

Borrowed from

Borrowed from

Loaned to

Loaned to

Borrowed from

Loaned to

the Nonutility

the Nonutility

the Nonutility

the Nonutility

the Nonutility

the Nonutility

Company

Money Pool

Money Pool

Money Pool

Money Pool

Money Pool

Money Pool

AEP Texas

1.11

%

0.97

%

1.02

%

0.75

%

1.00

%

0.86

%

SWEPCo

—

%

—

%

1.02

%

0.69

%

—

%

0.82

%

Year Ended December 31, 2015:

Maximum

Minimum

Maximum

Minimum

Average

Average

Interest Rate

Interest Rate

Interest Rate

Interest Rate

Interest Rate

Interest Rate

for Funds

for Funds

for Funds

for Funds

for Funds

for Funds

Borrowed from

Borrowed from

Loaned to

Loaned to

Borrowed from

Loaned to

the Nonutility

the Nonutility

the Nonutility

the Nonutility

the Nonutility

the Nonutility

Company

Money Pool

Money Pool

Money Pool

Money Pool

Money Pool

Money Pool

AEP Texas

1.14

%

0.64

%

—

%

—

%

0.76

%

—

%

SWEPCo

—

%

—

%

0.87

%

0.37

%

—

%

0.48

%

Maximum Minimum and Average Interest Rates for Funds Borrowed from and Loaned to AEP

Year Ended December 31, 2017:

	Maximum		Minimum		Maximum		Minimum		Average		Average
	Interest Rate		Interest Rate		Interest Rate		Interest Rate		Interest Rate		Interest Rate
	for Funds		for Funds		for Funds		for Funds		for Funds		for Funds
	Borrowed from		Borrowed from		Loaned to		Loaned to		Borrowed from		Loaned to
Company	AEP		AEP		AEP		AEP		AEP		AEP
AEP Texas	—	%	—	%	—	%	—	%	—	%	—	%
AEPTCo	1.85	%	0.92	%	1.85	%	0.92	%	1.33	%	1.36	%

Year Ended December 31, 2016:

	Maximum		Minimum		Maximum		Minimum		Average		Average
	Interest Rate		Interest Rate		Interest Rate		Interest Rate		Interest Rate		Interest Rate
	for Funds		for Funds		for Funds		for Funds		for Funds		for Funds
	Borrowed from		Borrowed from		Loaned to		Loaned to		Borrowed from		Loaned to
Company	AEP		AEP		AEP		AEP		AEP		AEP
AEP Texas	0.98	%	0.69	%	1.02	%	0.99	%	0.83	%	1.00	%
AEPTCo	1.02	%	0.69	%	1.02	%	0.69	%	0.83	%	0.87	%

Year Ended December 31, 2015:

	Maximum		Minimum		Maximum		Minimum		Average		Average
	Interest Rate		Interest Rate		Interest Rate		Interest Rate		Interest Rate		Interest Rate
	for Funds		for Funds		for Funds		for Funds		for Funds		for Funds
	Borrowed from		Borrowed from		Loaned to		Loaned to		Borrowed from		Loaned to
Company	AEP		AEP		AEP		AEP		AEP		AEP
AEP Texas	0.87	%	0.37	%	—	%	—	%	0.48	%	—	%
AEPTCo	0.87	%	0.37	%	0.87	%	0.37	%	0.48	%	0.47	%

Comparative Accounts Receivable Information

	Years Ended December 31,
	2017			2016			2015
	(dollars in millions)
Effective Interest Rates on Securitization of Accounts Receivable	1.22		%	0.70		%	0.30		%
Net Uncollectible Accounts Receivable Written Off	$	23.4		$	23.7		$	34.1

Customer Accounts Receivable Managed Portfolio

	December 31,
	2017		2016
	(in millions)
Accounts Receivable Retained Interest and Pledged as Collateral Less Uncollectible Accounts	$	925.5	$	945.0
Short-term – Securitized Debt of Receivables	718.0		673.0
Delinquent Securitized Accounts Receivable	41.1		42.7
Bad Debt Reserves Related to Securitization	28.7		27.7
Unbilled Receivables Related to Securitization	303.2		322.1

Accounts Receivable and Accrued Unbilled Revenues

	December 31,
Company	2017		2016
	(in millions)
APCo	$	136.2	$	142.0
I&M	136.5		136.7
OPCo	367.4		388.3
PSO	115.1		110.4
SWEPCo	138.2		130.9

Fees Paid to AEP Credit for Customer Accounts Receivable Sold

	Years Ended December 31,
Company	2017		2016		2015
	(in millions)
APCo	$	5.6	$	6.7	$	7.6
I&M	6.7		7.1		8.4
OPCo	21.7		28.9		30.7
PSO	7.0		6.2		5.8
SWEPCo	7.2		6.9		7.0

Proceeds on Sale of Receivables to AEP Credit

	Years Ended December 31,
Company	2017		2016		2015
	(in millions)
APCo	$	1,372.8	$	1,412.5	$	1,453.8
I&M	1,612.9		1,596.2		1,553.0
OPCo	2,339.0		2,633.0		2,569.4
PSO	1,337.0		1,269.3		1,326.1
SWEPCo	1,563.4		1,531.7		1,597.8