BENEFIT PLANS

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

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.

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
	Three Months Ended June 30,						Three Months Ended June 30,
	2018			2017			2018			2017
	(in millions)
Service Cost	$	24.4		$	24.1		$	2.9		$	2.8
Interest Cost	47.0			50.8			11.9			14.9
Expected Return on Plan Assets	(72.6		)	(71.2		)	(25.6		)	(25.4		)
Amortization of Prior Service Cost (Credit)	—			0.2			(17.2		)	(17.2		)
Amortization of Net Actuarial Loss	21.3			20.7			2.6			9.1
Net Periodic Benefit Cost (Credit)	$	20.1		$	24.6		$	(25.4	)	$	(15.8	)



	Pension Plans						OPEB
	Six Months Ended June 30,						Six Months Ended June 30,
	2018			2017			2018			2017
	(in millions)
Service Cost	$	48.8		$	48.2		$	5.8		$	5.6
Interest Cost	93.9			101.6			23.7			29.7
Expected Return on Plan Assets	(145.1		)	(142.4		)	(51.1		)	(50.7		)
Amortization of Prior Service Cost (Credit)	—			0.5			(34.5		)	(34.5		)
Amortization of Net Actuarial Loss	42.6			41.4			5.2			18.3
Net Periodic Benefit Cost (Credit)	$	40.2		$	49.3		$	(50.9	)	$	(31.6	)

AEP Texas



	Pension Plans						OPEB
	Three Months Ended June 30,						Three Months Ended June 30,
	2018			2017			2018			2017
	(in millions)
Service Cost	$	2.3		$	2.2		$	0.1		$	0.2
Interest Cost	4.0			4.3			1.0			1.3
Expected Return on Plan Assets	(6.4		)	(6.3		)	(2.2		)	(2.2		)
Amortization of Prior Service Credit	—			—			(1.4		)	(1.5		)
Amortization of Net Actuarial Loss	1.8			1.7			0.2			0.8
Net Periodic Benefit Cost (Credit)	$	1.7		$	1.9		$	(2.3	)	$	(1.4	)



	Pension Plans						OPEB
	Six Months Ended June 30,						Six Months Ended June 30,
	2018			2017			2018			2017
	(in millions)
Service Cost	$	4.6		$	4.3		$	0.4		$	0.4
Interest Cost	8.0			8.6			1.9			2.5
Expected Return on Plan Assets	(12.8		)	(12.6		)	(4.3		)	(4.4		)
Amortization of Prior Service Credit	—			—			(2.9		)	(2.9		)
Amortization of Net Actuarial Loss	3.6			3.5			0.4			1.6
Net Periodic Benefit Cost (Credit)	$	3.4		$	3.8		$	(4.5	)	$	(2.8	)

APCo



	Pension Plans						OPEB
	Three Months Ended June 30,						Three Months Ended June 30,
	2018			2017			2018			2017
	(in millions)
Service Cost	$	2.3		$	2.4		$	0.2		$	0.2
Interest Cost	5.9			6.4			2.1			2.7
Expected Return on Plan Assets	(9.2		)	(9.0		)	(4.0		)	(4.1		)
Amortization of Prior Service Credit	—			—			(2.5		)	(2.5		)
Amortization of Net Actuarial Loss	2.7			2.6			0.5			1.5
Net Periodic Benefit Cost (Credit)	$	1.7		$	2.4		$	(3.7	)	$	(2.2	)



	Pension Plans						OPEB
	Six Months Ended June 30,						Six Months Ended June 30,
	2018			2017			2018			2017
	(in millions)
Service Cost	$	4.6		$	4.7		$	0.5		$	0.5
Interest Cost	11.8			12.8			4.1			5.3
Expected Return on Plan Assets	(18.3		)	(17.9		)	(8.0		)	(8.2		)
Amortization of Prior Service Cost (Credit)	—			0.1			(5.0		)	(5.0		)
Amortization of Net Actuarial Loss	5.3			5.2			1.0			3.1
Net Periodic Benefit Cost (Credit)	$	3.4		$	4.9		$	(7.4	)	$	(4.3	)

I&M



	Pension Plans						OPEB
	Three Months Ended June 30,						Three Months Ended June 30,
	2018			2017			2018			2017
	(in millions)
Service Cost	$	3.4		$	3.5		$	0.4		$	0.4
Interest Cost	5.5			6.0			1.3			1.8
Expected Return on Plan Assets	(8.9		)	(8.7		)	(3.1		)	(3.0		)
Amortization of Prior Service Cost (Credit)	—			0.1			(2.3		)	(2.4		)
Amortization of Net Actuarial Loss	2.4			2.5			0.3			1.1
Net Periodic Benefit Cost (Credit)	$	2.4		$	3.4		$	(3.4	)	$	(2.1	)



	Pension Plans						OPEB
	Six Months Ended June 30,						Six Months Ended June 30,
	2018			2017			2018			2017
	(in millions)
Service Cost	$	6.8		$	7.0		$	0.8		$	0.8
Interest Cost	11.0			12.1			2.7			3.5
Expected Return on Plan Assets	(17.8		)	(17.3		)	(6.2		)	(6.1		)
Amortization of Prior Service Cost (Credit)	—			0.1			(4.7		)	(4.7		)
Amortization of Net Actuarial Loss	4.9			4.9			0.6			2.2
Net Periodic Benefit Cost (Credit)	$	4.9		$	6.8		$	(6.8	)	$	(4.3	)

OPCo



	Pension Plans						OPEB
	Three Months Ended June 30,						Three Months Ended June 30,
	2018			2017			2018			2017
	(in millions)
Service Cost	$	1.8		$	1.9		$	0.3		$	0.2
Interest Cost	4.5			4.9			1.3			1.7
Expected Return on Plan Assets	(7.2		)	(7.0		)	(2.9		)	(3.0		)
Amortization of Prior Service Cost (Credit)	—			0.1			(1.8		)	(1.8		)
Amortization of Net Actuarial Loss	2.0			1.9			0.2			1.1
Net Periodic Benefit Cost (Credit)	$	1.1		$	1.8		$	(2.9	)	$	(1.8	)



	Pension Plans						OPEB
	Six Months Ended June 30,						Six Months Ended June 30,
	2018			2017			2018			2017
	(in millions)
Service Cost	$	3.8		$	3.8		$	0.5		$	0.4
Interest Cost	8.9			9.7			2.6			3.4
Expected Return on Plan Assets	(14.4		)	(14.0		)	(5.9		)	(6.0		)
Amortization of Prior Service Cost (Credit)	—			0.1			(3.5		)	(3.5		)
Amortization of Net Actuarial Loss	4.0			3.9			0.5			2.2
Net Periodic Benefit Cost (Credit)	$	2.3		$	3.5		$	(5.8	)	$	(3.5	)

PSO



	Pension Plans						OPEB
	Three Months Ended June 30,						Three Months Ended June 30,
	2018			2017			2018			2017
	(in millions)
Service Cost	$	1.8		$	1.6		$	0.2		$	0.1
Interest Cost	2.5			2.7			0.6			0.8
Expected Return on Plan Assets	(4.1		)	(4.0		)	(1.4		)	(1.4		)
Amortization of Prior Service Credit	—			—			(1.1		)	(1.0		)
Amortization of Net Actuarial Loss	1.1			1.1			0.2			0.5
Net Periodic Benefit Cost (Credit)	$	1.3		$	1.4		$	(1.5	)	$	(1.0	)



	Pension Plans						OPEB
	Six Months Ended June 30,						Six Months Ended June 30,
	2018			2017			2018			2017
	(in millions)
Service Cost	$	3.6		$	3.2		$	0.4		$	0.3
Interest Cost	4.9			5.4			1.2			1.6
Expected Return on Plan Assets	(8.1		)	(7.9		)	(2.8		)	(2.8		)
Amortization of Prior Service Credit	—			—			(2.1		)	(2.1		)
Amortization of Net Actuarial Loss	2.2			2.2			0.3			1.0
Net Periodic Benefit Cost (Credit)	$	2.6		$	2.9		$	(3.0	)	$	(2.0	)

SWEPCo



	Pension Plans						OPEB
	Three Months Ended June 30,						Three Months Ended June 30,
	2018			2017			2018			2017
	(in millions)
Service Cost	$	2.3		$	2.2		$	0.2		$	0.2
Interest Cost	2.8			3.0			0.7			0.9
Expected Return on Plan Assets	(4.3		)	(4.2		)	(1.6		)	(1.6		)
Amortization of Prior Service Credit	—			—			(1.3		)	(1.3		)
Amortization of Net Actuarial Loss	1.2			1.2			0.2			0.6
Net Periodic Benefit Cost (Credit)	$	2.0		$	2.2		$	(1.8	)	$	(1.2	)



	Pension Plans						OPEB
	Six Months Ended June 30,						Six Months Ended June 30,
	2018			2017			2018			2017
	(in millions)
Service Cost	$	4.6		$	4.4		$	0.5		$	0.4
Interest Cost	5.7			6.1			1.4			1.8
Expected Return on Plan Assets	(8.7		)	(8.4		)	(3.2		)	(3.2		)
Amortization of Prior Service Credit	—			—			(2.6		)	(2.6		)
Amortization of Net Actuarial Loss	2.5			2.4			0.3			1.2
Net Periodic Benefit Cost (Credit)	$	4.1		$	4.5		$	(3.6	)	$	(2.4	)