Retirement Benefits

6 Months Ended

Jun. 30, 2011

Retirement Benefits

NOTE 12 - RETIREMENT BENEFITS

Ameren's pension and postretirement plans are funded in compliance with income tax regulations and to achieve federal funding or regulatory requirements. As a result, Ameren expects to fund its pension plans at a level equal to the greater of the pension net periodic cost for regulatory purposes or the legally required minimum contribution. Considering Ameren's assumptions at December 31, 2010, its estimated investment performance through June 30, 2011, and its pension funding policy, Ameren expects to make annual contributions of $75 million to $110 million in each of the next five years, with aggregate estimated contributions of $470 million. These amounts are estimates which may change with actual investment performance, changes in interest rates, any pertinent changes in government regulations, and any voluntary contributions. Our policy for postretirement benefits is primarily to fund the Voluntary Employee Beneficiary Association (VEBA) trusts to match the annual postretirement net periodic cost for regulatory purposes.

The following table presents the components of the net periodic benefit cost for Ameren's pension and postretirement benefit plans for the three and six months ended June 30, 2011, and 2010:

	Pension Benefits(a)												Postretirement Benefits(a)
	Three Months						Six Months						Three Months						Six Months
	2011			2010			2011			2010			2011			2010			2011			2010
Service cost	$	18		$	16		$	38		$	33		$	5		$	5		$	11		$	10
Interest cost		45			46			90			93			14			14			29			30
Expected return on plan assets		(54	)		(53	)		(108	)		(106	)		(13	)		(14	)		(27	)		(28	)
Amortization of:
Transition obligation		-			-			-			-			1			1			1			1
Prior service cost (benefit)		(1	)		2			(1	)		4			(2	)		(2	)		(4	)		(4	)
Actuarial loss (gain)		10			4			21			9			1			(1	)		2			1
Net periodic cost	$	18		$	15		$	40		$	33		$	6		$	3		$	12		$	10

(a) Includes amounts for Ameren registrant and nonregistrant subsidiaries.

Ameren Missouri, Ameren Illinois and Genco are responsible for their share of the pension and postretirement costs. The following table presents the pension costs and the postretirement benefit costs incurred for the three and six months ended June 30, 2011, and 2010:

	Pension Costs								Postretirement Costs
	Three Months				Six Months				Three Months				Six Months
	2011		2010		2011		2010		2011		2010		2011		2010
Ameren Missouri	$	12	$	9	$	26	$	21	$	2	$	2	$	5	$	5
Ameren Illinois		3		4		8		6		4		1		6		4
Genco		3		2		5		5		-		-		1		1
Other		-		-		1		1		-		-		-		-
Ameren(a)	$	18	$	15	$	40	$	33	$	6	$	3	$	12	$	10

(a) Includes amounts for Ameren registrant and nonregistrant subsidiaries.

Ameren Illinois [Member]

Retirement Benefits

NOTE 12 - RETIREMENT BENEFITS

Ameren's pension and postretirement plans are funded in compliance with income tax regulations and to achieve federal funding or regulatory requirements. As a result, Ameren expects to fund its pension plans at a level equal to the greater of the pension net periodic cost for regulatory purposes or the legally required minimum contribution. Considering Ameren's assumptions at December 31, 2010, its estimated investment performance through June 30, 2011, and its pension funding policy, Ameren expects to make annual contributions of $75 million to $110 million in each of the next five years, with aggregate estimated contributions of $470 million. These amounts are estimates which may change with actual investment performance, changes in interest rates, any pertinent changes in government regulations, and any voluntary contributions. Our policy for postretirement benefits is primarily to fund the Voluntary Employee Beneficiary Association (VEBA) trusts to match the annual postretirement net periodic cost for regulatory purposes.

The following table presents the components of the net periodic benefit cost for Ameren's pension and postretirement benefit plans for the three and six months ended June 30, 2011, and 2010:

	Pension Benefits(a)												Postretirement Benefits(a)
	Three Months						Six Months						Three Months						Six Months
	2011			2010			2011			2010			2011			2010			2011			2010
Service cost	$	18		$	16		$	38		$	33		$	5		$	5		$	11		$	10
Interest cost		45			46			90			93			14			14			29			30
Expected return on plan assets		(54	)		(53	)		(108	)		(106	)		(13	)		(14	)		(27	)		(28	)
Amortization of:
Transition obligation		-			-			-			-			1			1			1			1
Prior service cost (benefit)		(1	)		2			(1	)		4			(2	)		(2	)		(4	)		(4	)
Actuarial loss (gain)		10			4			21			9			1			(1	)		2			1
Net periodic cost	$	18		$	15		$	40		$	33		$	6		$	3		$	12		$	10

(a) Includes amounts for Ameren registrant and nonregistrant subsidiaries.

Ameren Missouri, Ameren Illinois and Genco are responsible for their share of the pension and postretirement costs. The following table presents the pension costs and the postretirement benefit costs incurred for the three and six months ended June 30, 2011, and 2010:

	Pension Costs								Postretirement Costs
	Three Months				Six Months				Three Months				Six Months
	2011		2010		2011		2010		2011		2010		2011		2010
Ameren Missouri	$	12	$	9	$	26	$	21	$	2	$	2	$	5	$	5
Ameren Illinois		3		4		8		6		4		1		6		4
Genco		3		2		5		5		-		-		1		1
Other		-		-		1		1		-		-		-		-
Ameren(a)	$	18	$	15	$	40	$	33	$	6	$	3	$	12	$	10

(a) Includes amounts for Ameren registrant and nonregistrant subsidiaries.

Ameren Energy Generating Company [Member]

Retirement Benefits

NOTE 12 - RETIREMENT BENEFITS

Ameren's pension and postretirement plans are funded in compliance with income tax regulations and to achieve federal funding or regulatory requirements. As a result, Ameren expects to fund its pension plans at a level equal to the greater of the pension net periodic cost for regulatory purposes or the legally required minimum contribution. Considering Ameren's assumptions at December 31, 2010, its estimated investment performance through June 30, 2011, and its pension funding policy, Ameren expects to make annual contributions of $75 million to $110 million in each of the next five years, with aggregate estimated contributions of $470 million. These amounts are estimates which may change with actual investment performance, changes in interest rates, any pertinent changes in government regulations, and any voluntary contributions. Our policy for postretirement benefits is primarily to fund the Voluntary Employee Beneficiary Association (VEBA) trusts to match the annual postretirement net periodic cost for regulatory purposes.

The following table presents the components of the net periodic benefit cost for Ameren's pension and postretirement benefit plans for the three and six months ended June 30, 2011, and 2010:

	Pension Benefits(a)												Postretirement Benefits(a)
	Three Months						Six Months						Three Months						Six Months
	2011			2010			2011			2010			2011			2010			2011			2010
Service cost	$	18		$	16		$	38		$	33		$	5		$	5		$	11		$	10
Interest cost		45			46			90			93			14			14			29			30
Expected return on plan assets		(54	)		(53	)		(108	)		(106	)		(13	)		(14	)		(27	)		(28	)
Amortization of:
Transition obligation		-			-			-			-			1			1			1			1
Prior service cost (benefit)		(1	)		2			(1	)		4			(2	)		(2	)		(4	)		(4	)
Actuarial loss (gain)		10			4			21			9			1			(1	)		2			1
Net periodic cost	$	18		$	15		$	40		$	33		$	6		$	3		$	12		$	10

(a) Includes amounts for Ameren registrant and nonregistrant subsidiaries.

Ameren Missouri, Ameren Illinois and Genco are responsible for their share of the pension and postretirement costs. The following table presents the pension costs and the postretirement benefit costs incurred for the three and six months ended June 30, 2011, and 2010:

	Pension Costs								Postretirement Costs
	Three Months				Six Months				Three Months				Six Months
	2011		2010		2011		2010		2011		2010		2011		2010
Ameren Missouri	$	12	$	9	$	26	$	21	$	2	$	2	$	5	$	5
Ameren Illinois		3		4		8		6		4		1		6		4
Genco		3		2		5		5		-		-		1		1
Other		-		-		1		1		-		-		-		-
Ameren(a)	$	18	$	15	$	40	$	33	$	6	$	3	$	12	$	10

(a) Includes amounts for Ameren registrant and nonregistrant subsidiaries.

Union Electric Company [Member]

Retirement Benefits

NOTE 12 - RETIREMENT BENEFITS

Ameren's pension and postretirement plans are funded in compliance with income tax regulations and to achieve federal funding or regulatory requirements. As a result, Ameren expects to fund its pension plans at a level equal to the greater of the pension net periodic cost for regulatory purposes or the legally required minimum contribution. Considering Ameren's assumptions at December 31, 2010, its estimated investment performance through June 30, 2011, and its pension funding policy, Ameren expects to make annual contributions of $75 million to $110 million in each of the next five years, with aggregate estimated contributions of $470 million. These amounts are estimates which may change with actual investment performance, changes in interest rates, any pertinent changes in government regulations, and any voluntary contributions. Our policy for postretirement benefits is primarily to fund the Voluntary Employee Beneficiary Association (VEBA) trusts to match the annual postretirement net periodic cost for regulatory purposes.

The following table presents the components of the net periodic benefit cost for Ameren's pension and postretirement benefit plans for the three and six months ended June 30, 2011, and 2010:

	Pension Benefits(a)												Postretirement Benefits(a)
	Three Months						Six Months						Three Months						Six Months
	2011			2010			2011			2010			2011			2010			2011			2010
Service cost	$	18		$	16		$	38		$	33		$	5		$	5		$	11		$	10
Interest cost		45			46			90			93			14			14			29			30
Expected return on plan assets		(54	)		(53	)		(108	)		(106	)		(13	)		(14	)		(27	)		(28	)
Amortization of:
Transition obligation		-			-			-			-			1			1			1			1
Prior service cost (benefit)		(1	)		2			(1	)		4			(2	)		(2	)		(4	)		(4	)
Actuarial loss (gain)		10			4			21			9			1			(1	)		2			1
Net periodic cost	$	18		$	15		$	40		$	33		$	6		$	3		$	12		$	10

(a) Includes amounts for Ameren registrant and nonregistrant subsidiaries.

Ameren Missouri, Ameren Illinois and Genco are responsible for their share of the pension and postretirement costs. The following table presents the pension costs and the postretirement benefit costs incurred for the three and six months ended June 30, 2011, and 2010:

	Pension Costs								Postretirement Costs
	Three Months				Six Months				Three Months				Six Months
	2011		2010		2011		2010		2011		2010		2011		2010
Ameren Missouri	$	12	$	9	$	26	$	21	$	2	$	2	$	5	$	5
Ameren Illinois		3		4		8		6		4		1		6		4
Genco		3		2		5		5		-		-		1		1
Other		-		-		1		1		-		-		-		-
Ameren(a)	$	18	$	15	$	40	$	33	$	6	$	3	$	12	$	10

(a) Includes amounts for Ameren registrant and nonregistrant subsidiaries.