Benefit Plans (Tables)

3 Months Ended

Mar. 31, 2015

Components of Net Periodic Benefit Cost

	Pension Plans						Other Postretirement Benefit Plans
	Three Months Ended March 31,						Three Months Ended March 31,
	2015			2014			2015			2014
	(in millions)
Service Cost	$	23		$	18		$	3		$	4
Interest Cost	51			55			14			17
Expected Return on Plan Assets	(69		)	(66		)	(28		)	(28		)
Amortization of Prior Service Cost (Credit)	1			1			(17		)	(17		)
Amortization of Net Actuarial Loss	27			31			5			5
Net Periodic Benefit Cost (Credit)	$	33		$	39		$	(23	)	$	(19	)

Appalachian Power Co [Member]

Components of Net Periodic Benefit Cost

APCo

	Pension Plans						Other Postretirement Benefit Plans
	Three Months Ended March 31,						Three Months Ended March 31,
	2015			2014			2015			2014
	(in thousands)
Service Cost	$	2,175		$	1,759		$	286		$	362
Interest Cost	6,679			7,406			2,584			3,197
Expected Return on Plan Assets	(8,745		)	(8,482		)	(4,529		)	(4,633		)
Amortization of Prior Service Cost (Credit)	45			50			(2,513		)	(2,513		)
Amortization of Net Actuarial Loss	3,473			4,148			900			1,146
Net Periodic Benefit Cost (Credit)	$	3,627		$	4,881		$	(3,272	)	$	(2,441	)

Indiana Michigan Power Co [Member]

Components of Net Periodic Benefit Cost

I&M

	Pension Plans						Other Postretirement Benefit Plans
	Three Months Ended March 31,						Three Months Ended March 31,
	2015			2014			2015			2014
	(in thousands)
Service Cost	$	3,217		$	2,517		$	406		$	487
Interest Cost	6,115			6,573			1,592			1,909
Expected Return on Plan Assets	(8,116		)	(7,748		)	(3,304		)	(3,364		)
Amortization of Prior Service Cost (Credit)	45			49			(2,355		)	(2,355		)
Amortization of Net Actuarial Loss	3,145			3,646			506			592
Net Periodic Benefit Cost (Credit)	$	4,406		$	5,037		$	(3,155	)	$	(2,731	)

Ohio Power Co [Member]

Components of Net Periodic Benefit Cost

OPCo

	Pension Plans						Other Postretirement Benefit Plans
	Three Months Ended March 31,						Three Months Ended March 31,
	2015			2014			2015			2014
	(in thousands)
Service Cost	$	1,672		$	1,285		$	216		$	256
Interest Cost	5,070			5,526			1,615			1,901
Expected Return on Plan Assets	(6,878		)	(6,607		)	(3,376		)	(3,380		)
Amortization of Prior Service Cost (Credit)	35			39			(1,731		)	(1,731		)
Amortization of Net Actuarial Loss	2,644			3,106			517			595
Net Periodic Benefit Cost (Credit)	$	2,543		$	3,349		$	(2,759	)	$	(2,359	)

Public Service Co Of Oklahoma [Member]

Components of Net Periodic Benefit Cost

PSO

	Pension Plans						Other Postretirement Benefit Plans
	Three Months Ended March 31,						Three Months Ended March 31,
	2015			2014			2015			2014
	(in thousands)
Service Cost	$	1,599		$	1,302		$	170		$	210
Interest Cost	2,731			3,014			759			893
Expected Return on Plan Assets	(3,786		)	(3,651		)	(1,577		)	(1,575		)
Amortization of Prior Service Cost (Credit)	63			74			(1,073		)	(1,072		)
Amortization of Net Actuarial Loss	1,417			1,688			242			277
Net Periodic Benefit Cost (Credit)	$	2,024		$	2,427		$	(1,479	)	$	(1,267	)

Southwestern Electric Power Co [Member]

Components of Net Periodic Benefit Cost

SWEPCo

	Pension Plans						Other Postretirement Benefit Plans
	Three Months Ended March 31,						Three Months Ended March 31,
	2015			2014			2015			2014
	(in thousands)
Service Cost	$	2,081		$	1,655		$	211		$	253
Interest Cost	2,932			3,163			837			998
Expected Return on Plan Assets	(4,008		)	(3,857		)	(1,735		)	(1,754		)
Amortization of Prior Service Cost (Credit)	77			87			(1,289		)	(1,289		)
Amortization of Net Actuarial Loss	1,507			1,761			266			309
Net Periodic Benefit Cost (Credit)	$	2,589		$	2,809		$	(1,710	)	$	(1,483	)