BENEFIT PLANS

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

For a discussion of investment strategy, investment limitations, target asset allocations and the classification of investments within the fair value hierarchy, see “Fair Value Measurements of Assets and Liabilities” and “Investments Held in Trust for Future Liabilities” sections of Note 1.

AEP sponsors a qualified pension plan and two unfunded nonqualified pension plans. Substantially all AEP employees are covered by the qualified plan or both the qualified and a nonqualified pension plan. AEP also sponsors OPEB plans to provide health and life insurance benefits for retired employees.

Due to the Registrant Subsidiaries’ participation in AEP’s benefits plans, the assumptions used by the actuary and the accounting for the plans by each subsidiary are the same. This section details the assumptions that apply to all Registrants and the rate of compensation increase for each Registrant.

The Registrants recognize the funded status associated with defined benefit pension and OPEB plans on the balance sheets. Disclosures about the plans are required by the “Compensation – Retirement Benefits” accounting guidance. The Registrants recognize an asset for a plan’s overfunded status or a liability for a plan’s underfunded status, and recognize, as a component of other comprehensive income, the changes in the funded status of the plan that arise during the year that are not recognized as a component of net periodic benefit cost. The Registrants record a regulatory asset instead of other comprehensive income for qualifying benefit costs of regulated operations that for ratemaking purposes are deferred for future recovery. The cumulative funded status adjustment is equal to the remaining unrecognized deferrals for unamortized actuarial losses or gains, prior service costs and transition obligations, such that remaining deferred costs result in an AOCI equity reduction or regulatory asset and deferred gains result in an AOCI equity addition or regulatory liability.

Actuarial Assumptions for Benefit Obligations

The weighted-average assumptions used in the measurement of the Registrants’ benefit obligations are shown in the following tables:



	Pension Plans				OPEB
	December 31,
Assumption	2017		2016		2017		2016
Discount Rate	3.65	%	4.05	%	3.60	%	4.10	%



	Pension Plans
	December 31,
Assumption – Rate of Compensation Increase (a)	2017		2016
AEP	4.80	%	4.75	%
AEP Texas	4.90	%	4.85	%
APCo	4.60	%	4.55	%
I&M	4.85	%	4.80	%
OPCo	4.95	%	4.85	%
PSO	4.90	%	4.90	%
SWEPCo	4.80	%	4.75	%


(a)	Rates are for base pay only. In addition, an amount is added to reflect target incentive compensation for exempt employees and overtime and incentive pay for nonexempt employees.

A duration-based method is used to determine the discount rate for the plans. A hypothetical portfolio of high quality corporate bonds is constructed with cash flows matching the benefit plan liability. The composite yield on the hypothetical bond portfolio is used as the discount rate for the plan. The discount rate is the same for each Registrant.

For 2017, the rate of compensation increase assumed varies with the age of the employee, ranging from 3.5% per year to 12% per year, with the average increase shown in the table above. The compensation increase rates reflect variations in each Registrants’ population participating in the pension plan.

Actuarial Assumptions for Net Periodic Benefit Costs

The weighted-average assumptions used in the measurement of each Registrants’ benefit costs are shown in the following tables:



	Pension Plans						OPEB
	Year Ended December 31,
Assumptions	2017		2016		2015		2017		2016		2015
Discount Rate	4.05	%	4.30	%	4.00	%	4.10	%	4.30	%	4.00	%
Expected Return on Plan Assets	6.00	%	6.00	%	6.00	%	6.75	%	7.00	%	6.75	%



	Pension Plans
	Year Ended December 31,
Assumption – Rate of Compensation Increase (a)	2017		2016		2015
AEP	4.80	%	4.75	%	4.80	%
AEP Texas	4.90	%	4.85	%	4.50	%
APCo	4.60	%	4.55	%	4.45	%
I&M	4.85	%	4.80	%	4.80	%
OPCo	4.95	%	4.85	%	4.80	%
PSO	4.90	%	4.90	%	4.80	%
SWEPCo	4.80	%	4.75	%	4.80	%


(a)	Rates are for base pay only. In addition, an amount is added to reflect target incentive compensation for exempt employees and overtime and incentive pay for nonexempt employees.

The expected return on plan assets was determined by evaluating historical returns, the current investment climate (yield on fixed income securities and other recent investment market indicators), rate of inflation, third party forecasts and current prospects for economic growth. The expected return on plan assets is the same for each Registrant.

The health care trend rate assumptions used for OPEB plans measurement purposes are shown below:



	December 31,
Health Care Trend Rates	2017		2016
Initial	6.50	%	7.00	%
Ultimate	5.00	%	5.00	%
Year Ultimate Reached	2024		2024

Assumed health care cost trend rates have a significant effect on the amounts reported for the OPEB health care plans. A 1% change in assumed health care cost trend rates would have the following effects:



	AEP			AEP Texas			APCo			I&M			OPCo			PSO			SWEPCo
	(in millions)
Effect on Total Service and Interest Cost Components of Net Periodic Postretirement Health Care Benefit Cost:
1% Increase	$	2.5		$	0.1		$	0.5		$	0.2		$	0.2		$	0.1		$	0.1
1% Decrease	(2.0		)	(0.1		)	(0.4		)	(0.2		)	(0.2		)	(0.1		)	(0.1		)

Effect on the Health Care Component of the Accumulated Postretirement Benefit Obligation:
1% Increase	$	45.4		$	2.6		$	10.8		$	3.7		$	3.5		$	1.7		$	1.9
1% Decrease	(39.6		)	(2.4		)	(9.1		)	(3.4		)	(3.2		)	(1.5		)	(1.8		)

Significant Concentrations of Risk within Plan Assets

In addition to establishing the target asset allocation of plan assets, the investment policy also places restrictions on securities to limit significant concentrations within plan assets. The investment policy establishes guidelines that govern maximum market exposure, security restrictions, prohibited asset classes, prohibited types of transactions, minimum credit quality, average portfolio credit quality, portfolio duration and concentration limits. The guidelines were established to mitigate the risk of loss due to significant concentrations in any investment. Management monitors the plans to control security diversification and ensure compliance with the investment policy. As of December 31, 2017, the assets were invested in compliance with all investment limits. See “Investments Held in Trust for Future Liabilities” section of Note 1 for limit details.

Benefit Plan Obligations, Plan Assets and Funded Status

The following tables provide a reconciliation of the changes in the plans’ benefit obligations, fair value of plan assets and funded status. The benefit obligation for the defined benefit pension and OPEB plans are the projected benefit obligation and the accumulated benefit obligation, respectively.



AEP	Pension Plans						OPEB
	2017			2016			2017			2016
Change in Benefit Obligation	(in millions)
Benefit Obligation as of January 1,	$	5,085.8		$	4,992.9		$	1,447.4		$	1,450.6
Service Cost	96.5			85.8			11.2			10.2
Interest Cost	203.1			211.6			59.3			60.9
Actuarial (Gain) Loss	182.4			142.7			(97.5		)	17.3
Benefit Payments	(352.0		)	(347.2		)	(128.6		)	(130.2		)
Participant Contributions	—			—			39.5			37.8
Medicare Subsidy	—			—			0.7			0.8
Benefit Obligation as of December 31,	$	5,215.8		$	5,085.8		$	1,332.0		$	1,447.4

Change in Fair Value of Plan Assets
Fair Value of Plan Assets as of January 1,	$	4,827.3		$	4,767.6		$	1,545.9		$	1,577.4
Actual Gain on Plan Assets	600.0			315.5			271.6			56.0
Company Contributions	98.8			91.4			4.1			4.9
Participant Contributions	—			—			39.5			37.8
Benefit Payments	(352.0		)	(347.2		)	(128.6		)	(130.2		)
Fair Value of Plan Assets as of December 31,	$	5,174.1		$	4,827.3		$	1,732.5		$	1,545.9

Funded (Underfunded) Status as of December 31,	$	(41.7	)	$	(258.5	)	$	400.5		$	98.5



AEP Texas	Pension Plans						OPEB
	2017			2016			2017			2016
Change in Benefit Obligation	(in millions)
Benefit Obligation as of January 1,	$	421.7		$	420.3		$	120.4		$	122.0
Transfer of CSW Energy, Inc. Benefit Obligation	—			(2.8		)	—			(0.4		)
Service Cost	8.6			7.5			0.9			0.7
Interest Cost	17.1			17.8			4.9			5.1
Actuarial (Gain) Loss	25.6			11.1			(11.9		)	0.8
Benefit Payments	(31.7		)	(32.2		)	(10.8		)	(11.4		)
Participant Contributions	—			—			3.6			3.5
Medicare Subsidy	—			—			—			0.1
Benefit Obligation as of December 31,	$	441.3		$	421.7		$	107.1		$	120.4

Change in Fair Value of Plan Assets
Fair Value of Plan Assets as of January 1,	$	416.6		$	415.4		$	134.1		$	138.6
Transfer of CSW Energy, Inc. Plan Assets	—			(2.5		)	—			(0.4		)
Actual Gain on Plan Assets	61.8			27.4			20.4			3.8
Company Contributions	9.2			8.5			—			—
Participant Contributions	—			—			3.6			3.5
Benefit Payments	(31.7		)	(32.2		)	(10.8		)	(11.4		)
Fair Value of Plan Assets as of December 31,	$	455.9		$	416.6		$	147.3		$	134.1

Funded (Underfunded) Status as of December 31,	$	14.6		$	(5.1	)	$	40.2		$	13.7



APCo	Pension Plans						OPEB
	2017			2016			2017			2016
Change in Benefit Obligation	(in millions)
Benefit Obligation as of January 1,	$	654.0		$	653.4		$	255.6		$	262.2
Service Cost	9.4			8.1			1.1			1.0
Interest Cost	25.7			27.2			10.6			10.8
Actuarial (Gain) Loss	15.7			9.2			(13.4		)	(0.2		)
Benefit Payments	(39.8		)	(43.9		)	(24.3		)	(24.8		)
Participant Contributions	—			—			6.7			6.4
Medicare Subsidy	—			—			0.2			0.2
Benefit Obligation as of December 31,	$	665.0		$	654.0		$	236.5		$	255.6

Change in Fair Value of Plan Assets
Fair Value of Plan Assets as of January 1,	$	606.4		$	603.2		$	246.9		$	256.7
Actual Gain on Plan Assets	74.9			38.3			41.6			5.9
Company Contributions	10.2			8.8			2.5			2.7
Participant Contributions	—			—			6.7			6.4
Benefit Payments	(39.8		)	(43.9		)	(24.3		)	(24.8		)
Fair Value of Plan Assets as of December 31,	$	651.7		$	606.4		$	273.4		$	246.9

Funded (Underfunded) Status as of December 31,	$	(13.3	)	$	(47.6	)	$	36.9		$	(8.7	)



I&M	Pension Plans						OPEB
	2017			2016			2017			2016
Change in Benefit Obligation	(in millions)
Benefit Obligation as of January 1,	$	611.6		$	591.5		$	167.6		$	166.3
Service Cost	14.0			12.2			1.6			1.5
Interest Cost	24.3			25.3			6.9			7.0
Actuarial (Gain) Loss	10.8			20.1			(12.0		)	3.8
Benefit Payments	(36.4		)	(37.5		)	(15.6		)	(15.7		)
Participant Contributions	—			—			4.9			4.6
Medicare Subsidy	—			—			0.1			0.1
Benefit Obligation as of December 31,	$	624.3		$	611.6		$	153.5		$	167.6

Change in Fair Value of Plan Assets
Fair Value of Plan Assets as of January 1,	$	586.1		$	570.0		$	186.6		$	189.0
Actual Gain on Plan Assets	74.0			40.6			35.2			8.7
Company Contributions	13.0			13.0			—			—
Participant Contributions	—			—			4.9			4.6
Benefit Payments	(36.4		)	(37.5		)	(15.6		)	(15.7		)
Fair Value of Plan Assets as of December 31,	$	636.7		$	586.1		$	211.1		$	186.6

Funded (Underfunded) Status as of December 31,	$	12.4		$	(25.5	)	$	57.6		$	19.0



OPCo	Pension Plans						OPEB
	2017			2016			2017			2016
Change in Benefit Obligation	(in millions)
Benefit Obligation as of January 1,	$	492.9		$	497.5		$	164.0		$	168.6
Service Cost	7.5			6.5			0.9			0.8
Interest Cost	19.4			20.6			6.7			7.0
Actuarial (Gain) Loss	13.1			4.7			(16.6		)	(1.0		)
Benefit Payments	(31.8		)	(36.4		)	(15.5		)	(16.2		)
Participant Contributions	—			—			4.7			4.7
Medicare Subsidy	—			—			0.1			0.1
Benefit Obligation as of December 31,	$	501.1		$	492.9		$	144.3		$	164.0

Change in Fair Value of Plan Assets
Fair Value of Plan Assets as of January 1,	$	473.8		$	472.1		$	182.6		$	191.6
Actual Gain on Plan Assets	58.9			30.9			26.7			2.5
Company Contributions	8.2			7.2			—			—
Participant Contributions	—			—			4.7			4.7
Benefit Payments	(31.8		)	(36.4		)	(15.5		)	(16.2		)
Fair Value of Plan Assets as of December 31,	$	509.1		$	473.8		$	198.5		$	182.6

Funded (Underfunded) Status as of December 31,	$	8.0		$	(19.1	)	$	54.2		$	18.6



PSO	Pension Plans						OPEB
	2017			2016			2017			2016
Change in Benefit Obligation	(in millions)
Benefit Obligation as of January 1,	$	266.7		$	265.4		$	77.6		$	77.7
Service Cost	6.4			6.2			0.7			0.6
Interest Cost	10.7			11.2			3.2			3.3
Actuarial (Gain) Loss	10.1			3.1			(7.5		)	1.0
Benefit Payments	(17.3		)	(19.2		)	(6.9		)	(7.2		)
Participant Contributions	—			—			2.3			2.2
Benefit Obligation as of December 31,	$	276.6		$	266.7		$	69.4		$	77.6

Change in Fair Value of Plan Assets
Fair Value of Plan Assets as of January 1,	$	266.0		$	262.1		$	86.4		$	88.3
Actual Gain on Plan Assets	33.6			17.3			13.7			3.1
Company Contributions	5.5			5.8			—			—
Participant Contributions	—			—			2.3			2.2
Benefit Payments	(17.3		)	(19.2		)	(6.9		)	(7.2		)
Fair Value of Plan Assets as of December 31,	$	287.8		$	266.0		$	95.5		$	86.4

Funded (Underfunded) Status as of December 31,	$	11.2		$	(0.7	)	$	26.1		$	8.8



SWEPCo	Pension Plans						OPEB
	2017			2016			2017			2016
Change in Benefit Obligation	(in millions)
Benefit Obligation as of January 1,	$	296.6		$	282.8		$	86.9		$	86.1
Service Cost	8.7			8.1			0.9			0.8
Interest Cost	12.3			12.4			3.6			3.6
Actuarial (Gain) Loss	16.3			13.8			(6.2		)	1.5
Benefit Payments	(19.3		)	(20.5		)	(7.4		)	(7.5		)
Participant Contributions	—			—			2.5			2.4
Benefit Obligation as of December 31,	$	314.6		$	296.6		$	80.3		$	86.9

Change in Fair Value of Plan Assets
Fair Value of Plan Assets as of January 1,	$	287.3		$	280.6		$	96.8		$	97.8
Actual Gain on Plan Assets	34.6			18.8			18.5			4.1
Company Contributions	9.1			8.4			—			—
Participant Contributions	—			—			2.5			2.4
Benefit Payments	(19.3		)	(20.5		)	(7.4		)	(7.5		)
Fair Value of Plan Assets as of December 31,	$	311.7		$	287.3		$	110.4		$	96.8

Funded (Underfunded) Status as of December 31,	$	(2.9	)	$	(9.3	)	$	30.1		$	9.9

Amounts Recognized on the Balance Sheets



	Pension Plans						OPEB
	December 31,
AEP	2017			2016			2017			2016
	(in millions)
Deferred Charges and Other Noncurrent Assets – Prepaid Benefit Costs	$	36.3		$	—		$	463.0		$	154.5
Other Current Liabilities – Accrued Short-term Benefit Liability	(6.2		)	(5.9		)	(3.2		)	(3.0		)
Employee Benefits and Pension Obligations – Accrued Long-term Benefit Liability	(71.8		)	(252.6		)	(59.3		)	(53.0		)
Funded (Underfunded) Status	$	(41.7	)	$	(258.5	)	$	400.5		$	98.5



	Pension Plans						OPEB
	December 31,
AEP Texas	2017			2016			2017		2016
	(in millions)
Deferred Charges and Other Noncurrent Assets – Prepaid Benefit Costs	$	18.6		$	—		$	40.2	$	13.7
Other Current Liabilities – Accrued Short-term Benefit Liability	(0.4		)	(0.4		)	—		—
Deferred Credits and Other Noncurrent Liabilities – Accrued Long-term Benefit Liability	(3.6		)	(4.7		)	—		—
Funded (Underfunded) Status	$	14.6		$	(5.1	)	$	40.2	$	13.7



	Pension Plans						OPEB
	December 31,
APCo	2017			2016			2017			2016
	(in millions)
Deferred Charges and Other Noncurrent Assets – Prepaid Benefit Costs	$	—		$	—		$	74.6		$	25.2
Other Current Liabilities – Accrued Short-term Benefit Liability	—			—			(2.5		)	(2.4		)
Employee Benefits and Pension Obligations – Accrued Long-term Benefit Liability	(13.3		)	(47.6		)	(35.2		)	(31.5		)
Funded (Underfunded) Status	$	(13.3	)	$	(47.6	)	$	36.9		$	(8.7	)



	Pension Plans						OPEB
	December 31,
I&M	2017			2016			2017		2016
	(in millions)
Deferred Charges and Other Noncurrent Assets – Prepaid Benefit Costs	$	13.4		$	—		$	57.6	$	19.0
Deferred Credits and Other Noncurrent Liabilities – Accrued Long-term Benefit Liability	(1.0		)	(25.5		)	—		—
Funded (Underfunded) Status	$	12.4		$	(25.5	)	$	57.6	$	19.0



	Pension Plans						OPEB
	December 31,
OPCo	2017			2016			2017		2016
	(in millions)
Deferred Charges and Other Noncurrent Assets – Prepaid Benefit Costs	$	8.4		$	—		$	54.2	$	18.6
Deferred Credits and Other Noncurrent Liabilities – Accrued Long-term Benefit Liability	(0.4		)	(19.1		)	—		—
Funded (Underfunded) Status	$	8.0		$	(19.1	)	$	54.2	$	18.6



	Pension Plans						OPEB
	December 31,
PSO	2017			2016			2017		2016
	(in millions)
Employee Benefits and Pension Assets – Prepaid Benefit Costs	$	13.9		$	1.6		$	26.1	$	8.8
Other Current Liabilities – Accrued Short-term Benefit Liability	(0.2		)	(0.2		)	—		—
Deferred Credits and Other Noncurrent Liabilities – Accrued Long-term Benefit Liability	(2.5		)	(2.1		)	—		—
Funded (Underfunded) Status	$	11.2		$	(0.7	)	$	26.1	$	8.8



	Pension Plans						OPEB
	December 31,
SWEPCo	2017			2016			2017		2016
	(in millions)
Deferred Charges and Other Noncurrent Assets – Prepaid Benefit Costs	$	—		$	—		$	30.1	$	9.9
Other Current Liabilities – Accrued Short-term Benefit Liability	(0.2		)	(0.1		)	—		—
Employee Benefits and Pension Obligations – Accrued Long-term Benefit Liability	(2.7		)	(9.2		)	—		—
Funded (Underfunded) Status	$	(2.9	)	$	(9.3	)	$	30.1	$	9.9

Amounts Included in AOCI, Income Tax Expense and Regulatory Assets



AEP	Pension Plans				OPEB
	December 31,
	2017		2016		2017			2016
Components	(in millions)
Net Actuarial Loss	$	1,354.2	$	1,569.8	$	309.9		$	614.4
Prior Service Cost (Credit)	—		1.0		(416.3		)	(485.4		)

Recorded as
Regulatory Assets	$	1,271.3	$	1,415.6	$	(82.4	)	$	90.4
Deferred Income Taxes	17.4		54.4		(5.0		)	13.5
Net of Tax AOCI	53.9		100.8		(15.6		)	25.1
Income Tax Expense (a)	11.6		—		(3.4		)	—



AEP Texas	Pension Plans				OPEB
	December 31,
	2017		2016		2017			2016
Components	(in millions)
Net Actuarial Loss	$	175.2	$	193.3	$	23.9		$	50.7
Prior Service Credit	—		—		(35.4		)	(41.2		)

Recorded as
Regulatory Assets	$	161.4	$	178.5	$	(10.2	)	$	9.7
Deferred Income Taxes	2.9		5.2		(0.3		)	(0.1		)
Net of Tax AOCI	8.9		9.6		(0.8		)	(0.1		)
Income Tax Expense (a)	2.0		—		(0.2		)	—



APCo	Pension Plans				OPEB
	December 31,
	2017		2016		2017			2016
Components	(in millions)
Net Actuarial Loss	$	182.5	$	216.2	$	48.0		$	92.9
Prior Service Cost (Credit)	—		0.2		(60.4		)	(70.5		)

Recorded as
Regulatory Assets	$	179.9	$	213.7	$	(11.1	)	$	7.7
Deferred Income Taxes	0.5		1.0		(0.3		)	5.1
Net of Tax AOCI	1.7		1.7		(0.8		)	9.6
Income Tax Expense (a)	0.4		—		(0.2		)	—



I&M	Pension Plans				OPEB
	December 31,
	2017		2016		2017			2016
Components	(in millions)
Net Actuarial Loss	$	94.9	$	133.2	$	42.0		$	81.3
Prior Service Cost (Credit)	—		0.2		(56.9		)	(66.3		)

Recorded as
Regulatory Assets	$	91.8	$	128.2	$	(14.0	)	$	13.7
Deferred Income Taxes	0.7		1.8		(0.2		)	0.5
Net of Tax AOCI	2.0		3.4		(0.6		)	0.8
Income Tax Expense (a)	0.4		—		(0.1		)	—



OPCo	Pension Plans				OPEB
	December 31,
	2017		2016		2017			2016
Components	(in millions)
Net Actuarial Loss	$	189.6	$	215.4	$	22.6		$	58.2
Prior Service Cost (Credit)	—		0.1		(41.6		)	(48.5		)

Recorded as
Regulatory Assets	$	189.6	$	215.5	$	(19.0	)	$	9.7



PSO	Pension Plans				OPEB
	December 31,
	2017		2016		2017			2016
Components	(in millions)
Net Actuarial Loss	$	78.8	$	91.0	$	19.8		$	37.3
Prior Service Credit	—		—		(25.9		)	(30.2		)

Recorded as
Regulatory Assets	$	78.8	$	91.0	$	(6.1	)	$	7.1



SWEPCo	Pension Plans				OPEB
	December 31,
	2017		2016		2017			2016
Components	(in millions)
Net Actuarial Loss	$	97.4	$	103.8	$	24.7		$	45.4
Prior Service Cost (Credit)	—		0.1		(31.4		)	(36.6		)

Recorded as
Regulatory Assets	$	97.4	$	103.9	$	(3.7	)	$	5.7
Deferred Income Taxes	—		—		(0.6		)	1.1
Net of Tax AOCI	—		—		(2.0		)	2.0
Income Tax Expense (a)	—		—		(0.4		)	—


(a)	Amounts relate to the re-measurement of Deferred Income Taxes as a result of Tax Reform. In accordance with the accounting guidance for “Income Taxes”, re-measurement of Deferred Income Taxes related to AOCI must flow through the statement of income.

Components of the change in amounts included in AOCI, Income Tax Expense and Regulatory Assets by Registrant are as follows:



AEP	Pension Plans						OPEB
	2017			2016			2017			2016
Components	(in millions)
Actuarial (Gain) Loss During the Year	$	(132.8	)	$	107.5		$	(267.8	)	$	68.4
Amortization of Actuarial Loss	(82.8		)	(83.8		)	(36.7		)	(31.4		)
Amortization of Prior Service Credit (Cost)	(1.0		)	(2.3		)	69.1			69.0
Change for the Year Ended December 31,	$	(216.6	)	$	21.4		$	(235.4	)	$	106.0



AEP Texas	Pension Plans						OPEB
	2017			2016			2017			2016
Components	(in millions)
Actuarial (Gain) Loss During the Year	$	(11.1	)	$	7.1		$	(23.6	)	$	6.4
Amortization of Actuarial Loss	(7.0		)	(7.1		)	(3.2		)	(2.8		)
Amortization of Prior Service Credit (Cost)	—			(0.4		)	5.8			6.0
Change for the Year Ended December 31,	$	(18.1	)	$	(0.4	)	$	(21.0	)	$	9.6



APCo	Pension Plans						OPEB
	2017			2016			2017			2016
Components	(in millions)
Actuarial (Gain) Loss During the Year	$	(23.3	)	$	6.2		$	(38.6	)	$	11.4
Amortization of Actuarial Loss	(10.4		)	(10.8		)	(6.3		)	(5.4		)
Amortization of Prior Service Credit (Cost)	(0.2		)	(0.1		)	10.1			10.1
Change for the Year Ended December 31,	$	(33.9	)	$	(4.7	)	$	(34.8	)	$	16.1



I&M	Pension Plans						OPEB
	2017			2016			2017			2016
Components	(in millions)
Actuarial (Gain) Loss During the Year	$	(28.6	)	$	13.2		$	(34.9	)	$	7.9
Amortization of Actuarial Loss	(9.7		)	(10.0		)	(4.4		)	(3.7		)
Amortization of Prior Service Credit (Cost)	(0.2		)	(0.1		)	9.4			9.4
Change for the Year Ended December 31,	$	(38.5	)	$	3.1		$	(29.9	)	$	13.6



OPCo	Pension Plans						OPEB
	2017			2016			2017			2016
Components	(in millions)
Actuarial (Gain) Loss During the Year	$	(18.0	)	$	1.5		$	(31.3	)	$	9.4
Amortization of Actuarial Loss	(7.8		)	(8.1		)	(4.3		)	(3.8		)
Amortization of Prior Service Credit (Cost)	(0.1		)	(0.1		)	6.9			6.9
Change for the Year Ended December 31,	$	(25.9	)	$	(6.7	)	$	(28.7	)	$	12.5



PSO	Pension Plans						OPEB
	2017			2016			2017			2016
Components	(in millions)
Actuarial (Gain) Loss During the Year	$	(7.9	)	$	1.3		$	(15.5	)	$	3.9
Amortization of Actuarial Loss	(4.3		)	(4.4		)	(2.0		)	(1.8		)
Amortization of Prior Service Credit (Cost)	—			(0.3		)	4.3			4.3
Change for the Year Ended December 31,	$	(12.2	)	$	(3.4	)	$	(13.2	)	$	6.4



SWEPCo	Pension Plans						OPEB
	2017			2016			2017			2016
Components	(in millions)
Actuarial (Gain) Loss During the Year	$	(1.5	)	$	11.5		$	(18.4	)	$	4.0
Amortization of Actuarial Loss	(4.9		)	(4.8		)	(2.3		)	(1.9		)
Amortization of Prior Service Credit (Cost)	(0.1		)	(0.3		)	5.2			5.0
Change for the Year Ended December 31,	$	(6.5	)	$	6.4		$	(15.5	)	$	7.1

Determination of Pension Expense

The determination of pension expense or income is based on a market-related valuation of assets which reduces year-to-year volatility. This market-related valuation recognizes investment gains or losses over a five-year period from the year in which they occur. Investment gains or losses for this purpose are the difference between the expected return calculated using the market-related value of assets and the actual return.

Pension and OPEB Assets

The fair value tables within Pension and OPEB Assets present the classification of assets for AEP within the fair value hierarchy. All Level 1, 2, 3 and Other amounts can be allocated to the Registrant Subsidiaries using the percentages in the table below:



	Pension Plan				OPEB
	December 31,
Company	2017		2016		2017		2016
AEP Texas	8.8	%	8.6	%	8.5	%	8.7	%
APCo	12.6	%	12.6	%	15.8	%	16.0	%
I&M	12.3	%	12.1	%	12.2	%	12.1	%
OPCo	9.8	%	9.8	%	11.5	%	11.8	%
PSO	5.6	%	5.5	%	5.5	%	5.6	%
SWEPCo	6.0	%	6.0	%	6.4	%	6.3	%

The following table presents the classification of pension plan assets for AEP within the fair value hierarchy as of December 31, 2017:



Asset Class	Level 1		Level 2		Level 3		Other			Total			Year End Allocation
	(in millions)
Equities:
Domestic	$	318.6	$	—	$	—	$	—		$	318.6		6.2	%
International	507.7		—		—		—			507.7			9.8	%
Options	—		26.9		—		—			26.9			0.5	%
Common Collective Trusts (c)	—		—		—		452.9			452.9			8.7	%
Subtotal – Equities	826.3		26.9		—		452.9			1,306.1			25.2	%

Fixed Income:
United States Government and Agency Securities	—		1,376.5		—		—			1,376.5			26.6	%
Corporate Debt	—		1,277.0		—		—			1,277.0			24.7	%
Foreign Debt	—		296.9		—		—			296.9			5.7	%
State and Local Government	—		31.7		—		—			31.7			0.6	%
Other – Asset Backed	—		10.2		—		—			10.2			0.2	%
Subtotal – Fixed Income	—		2,992.3		—		—			2,992.3			57.8	%

Infrastructure (c)	—		—		—		59.5			59.5			1.2	%
Real Estate (c)	—		—		—		290.3			290.3			5.6	%
Alternative Investments (c)	—		—		—		446.0			446.0			8.6	%
Securities Lending	—		501.8		—		—			501.8			9.7	%
Securities Lending Collateral (a)	—		—		—		(503.5		)	(503.5		)	(9.7	)%
Cash and Cash Equivalents (c)	0.4		35.6		—		21.2			57.2			1.1	%
Other – Pending Transactions and Accrued Income (b)	—		—		—		24.4			24.4			0.5	%

Total	$	826.7	$	3,556.6	$	—	$	790.8		$	5,174.1		100.0	%


(a)	Amounts in “Other” column primarily represent an obligation to repay collateral received as part of the Securities Lending Program.


(b)	Amounts in “Other” column primarily represent accrued interest, dividend receivables and transactions pending settlement.


(c)	Amounts in “Other” column represent investments for which fair value is measured using net asset value per share.

The following table sets forth a reconciliation of changes in the fair value of AEP’s assets classified as Level 3 in the fair value hierarchy for the pension assets:



	Infrastructure			Real Estate			Alternative Investments			Total Level 3
	(in millions)
Balance as of January 1, 2017	$	57.6		$	254.9		$	411.1		$	723.6
Actual Return on Plan Assets
Relating to Assets Still Held as of the Reporting Date	—			—			—			—
Relating to Assets Sold During the Period	—			—			—			—
Purchases and Sales	—			—			—			—
Transfers into Level 3	—			—			—			—
Transfers out of Level 3 (a)	(57.6		)	(254.9		)	(411.1		)	(723.6		)
Balance as of December 31, 2017	$	—		$	—		$	—		$	—

(a)

The classification of Level 3 assets from the prior year was corrected in the current year presentation and included within the fair value hierarchy table as of December 31, 2017 as “Other” investments for which fair value is measured using net asset value per share in accordance with ASU 2015-07, Disclosure for Investments in Certain Entities That Calculate Net Asset Value per Share (or Its Equivalent). Management concluded that these disclosure errors were immaterial individually and in the aggregate to all prior periods presented.

The following table presents the classification of OPEB plan assets for AEP within the fair value hierarchy as of December 31, 2017:



Asset Class	Level 1		Level 2		Level 3		Other			Total			Year End Allocation
	(in millions)
Equities:
Domestic	$	307.1	$	—	$	—	$	—		$	307.1		17.7	%
International	306.9		—		—		—			306.9			17.7	%
Options	—		9.4		—		—			9.4			0.5	%
Common Collective Trusts (b)	—		—		—		153.6			153.6			8.9	%
Subtotal – Equities	614.0		9.4		—		153.6			777.0			44.8	%

Fixed Income:
Common Collective Trust – Debt (b)	—		—		—		185.0			185.0			10.7	%
United States Government and Agency Securities	—		187.4		—		—			187.4			10.8	%
Corporate Debt	—		214.1		—		—			214.1			12.4	%
Foreign Debt	—		40.7		—		—			40.7			2.4	%
State and Local Government	49.7		16.8		—		—			66.5			3.8	%
Other – Asset Backed	—		0.2		—		—			0.2			—	%
Subtotal – Fixed Income	49.7		459.2		—		185.0			693.9			40.1	%

Trust Owned Life Insurance:
International Equities	—		105.4		—		—			105.4			6.1	%
United States Bonds	—		118.2		—		—			118.2			6.8	%
Subtotal – Trust Owned Life Insurance	—		223.6		—		—			223.6			12.9	%

Cash and Cash Equivalents (b)	36.7		—		—		4.2			40.9			2.4	%
Other – Pending Transactions and Accrued Income (a)	—		—		—		(2.9		)	(2.9		)	(0.2	)%

Total	$	700.4	$	692.2	$	—	$	339.9		$	1,732.5		100.0	%


(a)	Amounts in “Other” column primarily represent accrued interest, dividend receivables and transactions pending settlement.


(b)	Amounts in “Other” column represent investments for which fair value is measured using net asset value per share.

The following table presents the classification of pension plan assets for AEP within the fair value hierarchy as of December 31, 2016:



Asset Class	Level 1		Level 2		Level 3		Other			Total			Year End Allocation
	(in millions)
Equities:
Domestic	$	357.8	$	—	$	—	$	—		$	357.8		7.4	%
International	439.2		—		—		—			439.2			9.1	%
Options	—		20.0		—		—			20.0			0.4	%
Common Collective Trusts (c)	—		14.0		—		400.5			414.5			8.6	%
Subtotal – Equities	797.0		34.0		—		400.5			1,231.5			25.5	%

Fixed Income:
Common Collective Trust – Debt (c)	—		—		—		32.3			32.3			0.7	%
United States Government and Agency Securities (c)	—		423.3		—		17.7			441.0			9.1	%
Corporate Debt (c)	—		1,932.2		—		10.0			1,942.2			40.2	%
Foreign Debt (c)	—		373.7		—		12.1			385.8			8.0	%
State and Local Government	—		11.5		—		—			11.5			0.2	%
Other – Asset Backed (c)	—		5.4		—		7.4			12.8			0.3	%
Subtotal – Fixed Income	—		2,746.1		—		79.5			2,825.6			58.5	%

Infrastructure	—		—		57.6		—			57.6			1.2	%
Real Estate	—		—		254.9		—			254.9			5.3	%
Alternative Investments	—		—		411.1		—			411.1			8.5	%
Securities Lending	—		161.6		—		—			161.6			3.4	%
Securities Lending Collateral (a)	—		—		—		(163.3		)	(163.3		)	(3.4	)%
Cash and Cash Equivalents (c)	—		—		—		29.7			29.7			0.6	%
Other – Pending Transactions and Accrued Income (b)	—		—		—		18.6			18.6			0.4	%

Total	$	797.0	$	2,941.7	$	723.6	$	365.0		$	4,827.3		100.0	%


(a)	Amounts in “Other” column primarily represent an obligation to repay collateral received as part of the Securities Lending Program.


(b)	Amounts in “Other” column primarily represent accrued interest, dividend receivables and transactions pending settlement.


(c)	Amounts in “Other” column represent investments for which fair value is measured using net asset value per share.

The following table sets forth a reconciliation of changes in the fair value of AEP’s assets classified as Level 3 in the fair value hierarchy for the pension assets:



	Foreign Debt			Infrastructure		Real Estate			Alternative Investments			Total Level 3
	(in millions)
Balance as of January 1, 2016	$	0.1		$	42.0	$	253.7		$	378.7		$	674.5
Actual Return on Plan Assets
Relating to Assets Still Held as of the Reporting Date	—			5.9		5.3			13.7			24.9
Relating to Assets Sold During the Period	—			0.9		23.2			21.1			45.2
Purchases and Sales	(0.1		)	8.8		(27.3		)	(2.4		)	(21.0		)
Transfers into Level 3	—			—		—			—			—
Transfers out of Level 3	—			—		—			—			—
Balance as of December 31, 2016	$	—		$	57.6	$	254.9		$	411.1		$	723.6

The following table presents the classification of OPEB plan assets for AEP within the fair value hierarchy as of December 31, 2016:



Asset Class	Level 1		Level 2		Level 3		Other			Total			Year End Allocation
	(in millions)
Equities:
Domestic	$	517.1	$	—	$	—	$	—		$	517.1		33.5	%
International	435.5		—		—		—			435.5			28.2	%
Options	—		15.2		—		—			15.2			1.0	%
Common Collective Trusts (b)	—		10.9		—		20.5			31.4			2.0	%
Subtotal – Equities	952.6		26.1		—		20.5			999.2			64.7	%

Fixed Income:
Common Collective Trust – Debt (b)	—		—		—		93.7			93.7			6.0	%
United States Government and Agency Securities	—		64.7		—		—			64.7			4.2	%
Corporate Debt	—		121.6		—		—			121.6			7.9	%
Foreign Debt	—		18.6		—		—			18.6			1.2	%
State and Local Government	—		3.0		—		—			3.0			0.2	%
Other – Asset Backed	—		5.9		—		—			5.9			0.4	%
Subtotal – Fixed Income	—		213.8		—		93.7			307.5			19.9	%

Trust Owned Life Insurance:
International Equities (b)	—		—		—		110.1			110.1			7.1	%
United States Bonds (b)	—		—		—		97.4			97.4			6.3	%
Subtotal – Trust Owned Life Insurance	—		—		—		207.5			207.5			13.4	%

Cash and Cash Equivalents	24.0		10.5		—		—			34.5			2.2	%
Other – Pending Transactions and Accrued Income (a)	—		—		—		(2.8		)	(2.8		)	(0.2	)%

Total	$	976.6	$	250.4	$	—	$	318.9		$	1,545.9		100.0	%


(a)	Amounts in “Other” column primarily represent accrued interest, dividend receivables and transactions pending settlement.


(b)	Amounts in “Other” column represent investments for which fair value is measured using net asset value per share.

Accumulated Benefit Obligation

The accumulated benefit obligation for the pension plans is as follows:



Accumulated Benefit Obligation	AEP		AEP Texas		APCo		I&M		OPCo		PSO		SWEPCo
	(in millions)
Qualified Pension Plan	$	4,951.3	$	421.4	$	648.0	$	592.4	$	483.4	$	256.9	$	289.4
Nonqualified Pension Plans	73.9		3.8		0.2		0.4		0.1		2.7		2.2
Total as of December 31, 2017	$	5,025.2	$	425.2	$	648.2	$	592.8	$	483.5	$	259.6	$	291.6

Accumulated Benefit Obligation	AEP		AEP Texas		APCo		I&M		OPCo		PSO		SWEPCo
	(in millions)
Qualified Pension Plan	$	4,846.0	$	404.7	$	641.0	$	588.5	$	478.0	$	252.0	$	279.8
Nonqualified Pension Plans	69.8		3.8		0.3		0.3		—		2.2		1.7
Total as of December 31, 2016	$	4,915.8	$	408.5	$	641.3	$	588.8	$	478.0	$	254.2	$	281.5

For the underfunded pension plans that had an accumulated benefit obligation in excess of plan assets, the projected benefit obligation, accumulated benefit obligation and fair value of plan assets of these plans were as follows:



	AEP			AEP Texas			APCo			I&M			OPCo			PSO			SWEPCo
	(in millions)
Projected Benefit Obligation	$	78.0		$	4.0		$	0.4		$	1.0		$	0.4		$	2.7		$	2.2

Accumulated Benefit Obligation	$	73.9		$	3.8		$	0.2		$	0.4		$	0.1		$	2.7		$	2.2
Fair Value of Plan Assets	—			—			—			—			—			—			—
Underfunded Accumulated Benefit Obligation as of December 31, 2017	$	(73.9	)	$	(3.8	)	$	(0.2	)	$	(0.4	)	$	(0.1	)	$	(2.7	)	$	(2.2	)

	AEP			AEP Texas			APCo			I&M			OPCo			PSO			SWEPCo
	(in millions)
Projected Benefit Obligation	$	5,085.8		$	3.8		$	654.0		$	611.6		$	492.9		$	2.3		$	1.7

Accumulated Benefit Obligation	$	4,915.8		$	3.8		$	641.3		$	588.8		$	478.0		$	2.2		$	1.7
Fair Value of Plan Assets	4,827.3			—			606.4			586.1			473.8			—			—
Underfunded Accumulated Benefit Obligation as of December 31, 2016	$	(88.5	)	$	(3.8	)	$	(34.9	)	$	(2.7	)	$	(4.2	)	$	(2.2	)	$	(1.7	)

Estimated Future Benefit Payments and Contributions

The estimated pension benefit payments and contributions to the trust are at least the minimum amount required by the Employee Retirement Income Security Act plus payment of unfunded nonqualified benefits. For the qualified pension plan, additional discretionary contributions may also be made to maintain the funded status of the plan. For OPEB plans, expected payments include the payment of unfunded benefits. The following table provides the estimated contributions and payments by Registrant for 2018:



Company	Pension Plans		OPEB
	(in millions)
AEP	$	100.7	$	4.2
AEP Texas	3.6		—
APCo	9.6		2.5
I&M	1.6		—
OPCo	1.2		—
PSO	0.2		—
SWEPCo	2.8		—

The tables below reflect the total benefits expected to be paid from the plan or from the Registrants’ assets. The payments include the participants’ contributions to the plan for their share of the cost. Future benefit payments are dependent on the number of employees retiring, whether the retiring employees elect to receive pension benefits as annuities or as lump sum distributions, future integration of the benefit plans with changes to Medicare and other legislation, future levels of interest rates and variances in actuarial results. The estimated payments for the pension benefits and OPEB are as follows:



Pension Plans	AEP		AEP Texas		APCo		I&M		OPCo		PSO		SWEPCo
	(in millions)
2018	$	333.2	$	31.0	$	42.9	$	35.1	$	35.1	$	18.6	$	20.8
2019	340.1		31.0		43.9		37.2		35.0		19.5		21.6
2020	345.0		33.7		43.5		37.6		35.1		19.8		21.8
2021	356.2		34.7		44.4		38.7		34.3		21.7		23.2
2022	356.8		33.5		44.6		40.4		35.0		21.1		23.3
Years 2023 to 2027, in Total	1,795.4		165.6		221.3		210.8		165.6		104.3		121.5



OPEB Benefit Payments	AEP		AEP Texas		APCo		I&M		OPCo		PSO		SWEPCo
	(in millions)
2018	$	122.8	$	10.2	$	23.3	$	14.9	$	14.6	$	6.5	$	7.1
2019	123.1		10.4		22.8		14.9		14.7		6.6		7.1
2020	124.0		10.5		22.8		15.0		14.6		6.8		7.4
2021	124.6		10.7		22.6		15.2		14.5		6.8		7.6
2022	124.6		10.8		22.3		15.2		14.5		6.8		7.7
Years 2023 to 2027, in Total	616.4		53.7		106.2		74.8		69.6		34.7		40.4



OPEB Medicare Subsidy Receipts	AEP		AEP Texas		APCo		I&M		OPCo		PSO		SWEPCo
	(in millions)
2018	$	0.3	$	—	$	0.2	$	—	$	—	$	—	$	—
2019	0.3		—		0.2		—		—		—		—
2020	0.3		—		0.2		—		—		—		—
2021	0.3		—		0.2		—		—		—		—
2022	0.3		—		0.2		—		—		—		—
Years 2023 to 2027, in Total	1.7		—		0.9		—		—		—		—

Components of Net Periodic Benefit Cost

The following tables provide the components of net periodic benefit cost (credit) by Registrant for the plans:



AEP	Pension Plans									OPEB
	Years Ended December 31,
	2017			2016			2015			2017			2016			2015
	(in millions)
Service Cost	$	96.5		$	85.8		$	93.5		$	11.2		$	10.2		$	12.2
Interest Cost	203.1			211.6			205.3			59.3			60.9			56.8
Expected Return on Plan Assets	(284.8		)	(280.3		)	(274.8		)	(101.3		)	(107.0		)	(111.0		)
Amortization of Prior Service Cost (Credit)	1.0			2.3			2.2			(69.1		)	(69.0		)	(69.1		)
Amortization of Net Actuarial Loss	82.8			83.8			107.1			36.7			31.4			18.8
Net Periodic Benefit Cost (Credit)	98.6			103.2			133.3			(63.2		)	(73.5		)	(92.3		)
Capitalized Portion	(39.9		)	(37.8		)	(48.4		)	25.6			26.9			33.5
Net Periodic Benefit Cost (Credit) Recognized in Expense	$	58.7		$	65.4		$	84.9		$	(37.6	)	$	(46.6	)	$	(58.8	)



AEP Texas	Pension Plans									OPEB
	Years Ended December 31,
	2017			2016			2015			2017			2016			2015
	(in millions)
Service Cost	$	8.6		$	7.5		$	7.6		$	0.9		$	0.7		$	0.8
Interest Cost	17.1			17.8			17.2			4.9			5.1			4.8
Expected Return on Plan Assets	(25.0		)	(24.5		)	(24.1		)	(8.8		)	(9.3		)	(9.9		)
Amortization of Prior Service Cost (Credit)	—			0.4			0.3			(5.8		)	(6.0		)	(5.9		)
Amortization of Net Actuarial Loss	7.0			7.1			9.0			3.2			2.8			1.5
Net Periodic Benefit Cost (Credit)	7.7			8.3			10.0			(5.6		)	(6.7		)	(8.7		)
Capitalized Portion	(4.0		)	(3.6		)	(4.7		)	2.9			3.4			4.1
Net Periodic Benefit Cost (Credit) Recognized in Expense	$	3.7		$	4.7		$	5.3		$	(2.7	)	$	(3.3	)	$	(4.6	)



APCo	Pension Plans									OPEB
	Years Ended December 31,
	2017			2016			2015			2017			2016			2015
	(in millions)
Service Cost	$	9.4		$	8.1		$	8.7		$	1.1		$	1.0		$	1.1
Interest Cost	25.7			27.2			26.7			10.6			10.8			10.3
Expected Return on Plan Assets	(35.8		)	(35.3		)	(35.0		)	(16.5		)	(17.3		)	(18.1		)
Amortization of Prior Service Cost (Credit)	0.2			0.1			0.2			(10.1		)	(10.1		)	(10.0		)
Amortization of Net Actuarial Loss	10.4			10.8			13.9			6.3			5.4			3.6
Net Periodic Benefit Cost (Credit)	9.9			10.9			14.5			(8.6		)	(10.2		)	(13.1		)
Capitalized Portion	(4.0		)	(4.1		)	(5.5		)	3.5			3.9			5.0
Net Periodic Benefit Cost (Credit) Recognized in Expense	$	5.9		$	6.8		$	9.0		$	(5.1	)	$	(6.3	)	$	(8.1	)



I&M	Pension Plans									OPEB
	Years Ended December 31,
	2017			2016			2015			2017			2016			2015
	(in millions)
Service Cost	$	14.0		$	12.2		$	12.9		$	1.6		$	1.5		$	1.6
Interest Cost	24.3			25.3			24.5			6.9			7.0			6.4
Expected Return on Plan Assets	(34.6		)	(33.6		)	(32.6		)	(12.2		)	(12.9		)	(13.2		)
Amortization of Prior Service Cost (Credit)	0.2			0.1			0.2			(9.4		)	(9.4		)	(9.4		)
Amortization of Net Actuarial Loss	9.7			10.0			12.6			4.4			3.7			2.0
Net Periodic Benefit Cost (Credit)	13.6			14.0			17.6			(8.7		)	(10.1		)	(12.6		)
Capitalized Portion	(5.5		)	(3.3		)	(4.0		)	3.5			2.4			2.9
Net Periodic Benefit Cost (Credit) Recognized in Expense	$	8.1		$	10.7		$	13.6		$	(5.2	)	$	(7.7	)	$	(9.7	)



OPCo	Pension Plans									OPEB
	Years Ended December 31,
	2017			2016			2015			2017			2016			2015
	(in millions)
Service Cost	$	7.5		$	6.5		$	6.7		$	0.9		$	0.8		$	0.9
Interest Cost	19.4			20.6			20.3			6.7			7.0			6.4
Expected Return on Plan Assets	(27.9		)	(27.6		)	(27.5		)	(11.9		)	(13.0		)	(13.4		)
Amortization of Prior Service Cost (Credit)	0.1			0.1			0.2			(6.9		)	(6.9		)	(7.0		)
Amortization of Net Actuarial Loss	7.8			8.1			10.5			4.3			3.8			2.1
Net Periodic Benefit Cost (Credit)	6.9			7.7			10.2			(6.9		)	(8.3		)	(11.0		)
Capitalized Portion	(3.3		)	(3.4		)	(4.8		)	3.3			3.7			5.2
Net Periodic Benefit Cost (Credit) Recognized in Expense	$	3.6		$	4.3		$	5.4		$	(3.6	)	$	(4.6	)	$	(5.8	)



PSO	Pension Plans									OPEB
	Years Ended December 31,
	2017			2016			2015			2017			2016			2015
	(in millions)
Service Cost	$	6.4		$	6.2		$	6.4		$	0.7		$	0.6		$	0.7
Interest Cost	10.7			11.2			10.9			3.2			3.3			3.0
Expected Return on Plan Assets	(15.6		)	(15.5		)	(15.1		)	(5.6		)	(6.1		)	(6.3		)
Amortization of Prior Service Cost (Credit)	—			0.3			0.2			(4.3		)	(4.3		)	(4.3		)
Amortization of Net Actuarial Loss	4.3			4.4			5.7			2.0			1.8			1.0
Net Periodic Benefit Cost (Credit)	5.8			6.6			8.1			(4.0		)	(4.7		)	(5.9		)
Capitalized Portion	(2.1		)	(2.4		)	(2.8		)	1.4			1.7			2.0
Net Periodic Benefit Cost (Credit) Recognized in Expense	$	3.7		$	4.2		$	5.3		$	(2.6	)	$	(3.0	)	$	(3.9	)



SWEPCo	Pension Plans									OPEB
	Years Ended December 31,
	2017			2016			2015			2017			2016			2015
	(in millions)
Service Cost	$	8.7		$	8.1		$	8.3		$	0.9		$	0.8		$	0.8
Interest Cost	12.3			12.4			11.8			3.6			3.6			3.4
Expected Return on Plan Assets	(17.0		)	(16.4		)	(16.0		)	(6.3		)	(6.8		)	(6.9		)
Amortization of Prior Service Cost (Credit)	0.1			0.3			0.3			(5.2		)	(5.0		)	(5.2		)
Amortization of Net Actuarial Loss	4.9			4.8			6.0			2.3			1.9			1.1
Net Periodic Benefit Cost (Credit)	9.0			9.2			10.4			(4.7		)	(5.5		)	(6.8		)
Capitalized Portion	(2.7		)	(2.7		)	(3.2		)	1.4			1.6			2.1
Net Periodic Benefit Cost (Credit) Recognized in Expense	$	6.3		$	6.5		$	7.2		$	(3.3	)	$	(3.9	)	$	(4.7	)

Estimated amounts expected to be amortized to net periodic benefit costs (credits) and the impact on each Registrants’ balance sheet during 2018 are shown in the following tables:



	AEP			AEP Texas			APCo			I&M			OPCo			PSO			SWEPCo
Pension Plans – Components	(in millions)
Net Actuarial Loss	$	85.5		$	7.2		$	10.8		$	10.1		$	8.1		$	4.5		$	5.1
Total Estimated 2018 Amortization	$	85.5		$	7.2		$	10.8		$	10.1		$	8.1		$	4.5		$	5.1

Pension Plans – Expected to be Recorded as
Regulatory Asset	$	75.9		$	6.8		$	10.8		$	9.5		$	8.1		$	4.5		$	5.1
Deferred Income Taxes	2.0			0.1			—			0.1			—			—			—
Net of Tax AOCI	7.6			0.3			—			0.5			—			—			—
Total	$	85.5		$	7.2		$	10.8		$	10.1		$	8.1		$	4.5		$	5.1

	AEP			AEP Texas			APCo			I&M			OPCo			PSO			SWEPCo
OPEB – Components	(in millions)
Net Actuarial Loss	$	9.8		$	0.7		$	1.9		$	1.0		$	1.0		$	0.5		$	0.6
Prior Service Credit	(69.1		)	(5.8		)	(10.1		)	(9.4		)	(6.9		)	(4.3		)	(5.2		)
Total Estimated 2018 Amortization	$	(59.3	)	$	(5.1	)	$	(8.2	)	$	(8.4	)	$	(5.9	)	$	(3.8	)	$	(4.6	)

OPEB – Expected to be Recorded as
Regulatory Asset	$	(42.9	)	$	(5.1	)	$	(4.2	)	$	(7.6	)	$	(5.9	)	$	(3.8	)	$	(2.8	)
Deferred Income Taxes	(3.5		)	—			(0.8		)	(0.2		)	—			—			(0.4		)
Net of Tax AOCI	(12.9		)	—			(3.2		)	(0.6		)	—			—			(1.4		)
Total	$	(59.3	)	$	(5.1	)	$	(8.2	)	$	(8.4	)	$	(5.9	)	$	(3.8	)	$	(4.6	)

American Electric Power System Retirement Savings Plan

AEP sponsors the American Electric Power System Retirement Savings Plan, a defined contribution retirement savings plan for substantially all employees who are not covered by a retirement savings plan of the United Mine Workers of America (UMWA). This qualified plan offers participants an opportunity to contribute a portion of their pay, includes features under Section 401(k) of the Internal Revenue Code and provides for company matching contributions. The matching contributions to the plan are 100% of the first 1% of eligible employee contributions and 70% of the next 5% of contributions.

The following table provides the cost for matching contributions to the retirement savings plans by Registrant:



	Year Ended December 31,
Company	2017		2016		2015
	(in millions)
AEP	$	74.6	$	72.9	$	73.6
AEP Texas	6.0		5.2		5.0
APCo	7.4		7.3		7.2
I&M	10.7		10.9		10.6
OPCo	6.1		5.6		5.4
PSO	5.0		4.3		4.2
SWEPCo	6.0		5.7		5.7

UMWA Benefits

Health and Welfare Benefits (Applies to AEP and APCo)

AEP provides health and welfare benefits for certain unionized employees, retirees and their survivors who meet eligibility requirements. APCo also provides the same UMWA health and welfare benefits for certain unionized mining retirees and their survivors who meet eligibility requirements. AEP and APCo administer the health and welfare benefits and pay them from their general assets.

Multiemployer Pension Benefits (Applies to AEP)

UMWA pension benefits are provided through the United Mine Workers of America 1974 Pension Plan (Employer Identification Number: 52-1050282, Plan Number 002), a multiemployer plan. The UMWA pension benefits are administered by a board of trustees appointed in equal numbers by the UMWA and the Bituminous Coal Operators’ Association (BCOA), an industry bargaining association. AEP makes contributions to the United Mine Workers of America 1974 Pension Plan based on provisions in its labor agreement and the plan documents. The UMWA pension plan is different from single-employer plans as an employer’s contributions may be used to provide benefits to employees of other participating employers. A withdrawing employer may be subject to a withdrawal liability, which is calculated based upon that employer’s share of the plan’s unfunded benefit obligations. If an employer fails to make required contributions or if its payments in connection with its withdrawal liability fall short of satisfying its share of the plan’s unfunded benefit obligations, the remaining employers may be allocated a greater share of the remaining unfunded plan obligations. Under the Pension Protection Act of 2006 (PPA), the UMWA pension plan was in Critical and Declining Status for the plan years ending June 30, 2017 and 2016, without utilization of extended amortization provisions. As required under the PPA, the Plan adopted a Rehabilitation Plan in February 2015 which was updated in May 2016, August 2016 and May 2017.

The amounts contributed in 2017, 2016 and 2015 were immaterial and represent less than 5% of the total contributions in the plan’s latest annual report based on the plan year ended June 30, 2016. UMWA pension contributions included a surcharge of 5% from December 2014 through June 2015. UMWA pension contributions included a surcharge of 10% from July 2015 through June 2016 at which time new base contribution rates went into effect with no associated surcharges.

Under the terms of the UMWA pension plan, contributions will be required to continue beyond the February 28, 2018 expiration of the current collective bargaining agreement, whether or not the term of that agreement is extended or a subsequent agreement is entered, so long as both the UMWA pension plan remains in effect and an AEP affiliate continues to operate the facility covered by the current collective bargaining agreement. The contribution rate applicable would be determined in accordance with the terms of the UMWA pension plan by reference to the National Bituminous Coal Wage Agreement, subject to periodic revisions, between the UMWA and the BCOA. If the UMWA pension plan would terminate or an AEP affiliate would cease operation of the facility without arranging for a successor operator to assume its liability, the withdrawal liability obligation would be triggered.

Based upon the planned closure of Cook Coal Terminal in 2022, AEP records a UMWA pension withdrawal liability on the balance sheet. The UMWA pension withdrawal liability is re-measured annually and is related to the company’s proportionate share of the plan’s unfunded vested liabilities. As of December 31, 2017 and 2016, the liability balance was $19 million and $39 million, respectively. AEP recovers the estimated UMWA pension withdrawal liability through fuel clauses in certain regulated jurisdictions. A regulatory asset is recorded on the balance sheet when the UMWA pension withdrawal liability exceeds the cumulative billings collected. As of December 31, 2017 and 2016, the regulatory asset balance was $1 million and $20 million, respectively. If any portion of the UMWA pension withdrawal liability is not recoverable, it could reduce future net income and cash flows and impact financial condition.