Retirement Benefits

9 Months Ended

Sep. 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 September 30, 2011, and its pension funding policy, Ameren expects to make annual contributions of $125 million to $150 million in each of the next five years, with aggregate estimated contributions of $690 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. In August 2011, Ameren Illinois contributed to Ameren's postretirement benefit VEBA trust an incremental $100 million in excess of Ameren Illinois' annual postretirement net periodic cost for regulatory purposes. This cash contribution will reduce future postretirement net periodic cost to the extent expected returns are achieved on the contribution.

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

	Pension Benefits(a)												Postretirement Benefits(a)
	Three Months						Nine Months						Three Months						Nine Months
	2011			2010			2011			2010			2011			2010			2011			2010
Service cost	$	19		$	18		$	57		$	51		$	6		$	5		$	17		$	15
Interest cost		45			45			135			138			15			16			44			46
Expected return on plan assets		(54	)		(53	)		(162	)		(159	)		(14	)		(14	)		(41	)		(42	)
Amortization of:
Transition obligation		-			-			-			-			1			1			2			2
Prior service cost (benefit)		-			1			(1	)		5			(2	)		(2	)		(6	)		(6	)
Actuarial loss		10			5			31			14			1			-			3			1
Net periodic cost	$	20		$	16		$	60		$	49		$	7		$	6		$	19		$	16

(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 nine months ended September 30, 2011, and 2010:

	Pension Costs								Postretirement Costs
	Three Months				Nine Months				Three Months				Nine Months
	2011		2010		2011		2010		2011		2010		2011		2010
Ameren Missouri	$	13	$	10	$	39	$	31	$	3	$	3	$	8	$	8
Ameren Illinois		4		3		12		9		3		2		9		6
Genco		1		1		6		6		1		-		2		1
Other		2		2		3		3		-		1		-		1
Ameren(a)	$	20	$	16	$	60	$	49	$	7	$	6	$	19	$	16

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

Ameren Illinois 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 September 30, 2011, and its pension funding policy, Ameren expects to make annual contributions of $125 million to $150 million in each of the next five years, with aggregate estimated contributions of $690 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. In August 2011, Ameren Illinois contributed to Ameren's postretirement benefit VEBA trust an incremental $100 million in excess of Ameren Illinois' annual postretirement net periodic cost for regulatory purposes. This cash contribution will reduce future postretirement net periodic cost to the extent expected returns are achieved on the contribution.

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

	Pension Benefits(a)												Postretirement Benefits(a)
	Three Months						Nine Months						Three Months						Nine Months
	2011			2010			2011			2010			2011			2010			2011			2010
Service cost	$	19		$	18		$	57		$	51		$	6		$	5		$	17		$	15
Interest cost		45			45			135			138			15			16			44			46
Expected return on plan assets		(54	)		(53	)		(162	)		(159	)		(14	)		(14	)		(41	)		(42	)
Amortization of:
Transition obligation		-			-			-			-			1			1			2			2
Prior service cost (benefit)		-			1			(1	)		5			(2	)		(2	)		(6	)		(6	)
Actuarial loss		10			5			31			14			1			-			3			1
Net periodic cost	$	20		$	16		$	60		$	49		$	7		$	6		$	19		$	16

(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 nine months ended September 30, 2011, and 2010:

	Pension Costs								Postretirement Costs
	Three Months				Nine Months				Three Months				Nine Months
	2011		2010		2011		2010		2011		2010		2011		2010
Ameren Missouri	$	13	$	10	$	39	$	31	$	3	$	3	$	8	$	8
Ameren Illinois		4		3		12		9		3		2		9		6
Genco		1		1		6		6		1		-		2		1
Other		2		2		3		3		-		1		-		1
Ameren(a)	$	20	$	16	$	60	$	49	$	7	$	6	$	19	$	16

(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 September 30, 2011, and its pension funding policy, Ameren expects to make annual contributions of $125 million to $150 million in each of the next five years, with aggregate estimated contributions of $690 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. In August 2011, Ameren Illinois contributed to Ameren's postretirement benefit VEBA trust an incremental $100 million in excess of Ameren Illinois' annual postretirement net periodic cost for regulatory purposes. This cash contribution will reduce future postretirement net periodic cost to the extent expected returns are achieved on the contribution.

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

	Pension Benefits(a)												Postretirement Benefits(a)
	Three Months						Nine Months						Three Months						Nine Months
	2011			2010			2011			2010			2011			2010			2011			2010
Service cost	$	19		$	18		$	57		$	51		$	6		$	5		$	17		$	15
Interest cost		45			45			135			138			15			16			44			46
Expected return on plan assets		(54	)		(53	)		(162	)		(159	)		(14	)		(14	)		(41	)		(42	)
Amortization of:
Transition obligation		-			-			-			-			1			1			2			2
Prior service cost (benefit)		-			1			(1	)		5			(2	)		(2	)		(6	)		(6	)
Actuarial loss		10			5			31			14			1			-			3			1
Net periodic cost	$	20		$	16		$	60		$	49		$	7		$	6		$	19		$	16

(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 nine months ended September 30, 2011, and 2010:

	Pension Costs								Postretirement Costs
	Three Months				Nine Months				Three Months				Nine Months
	2011		2010		2011		2010		2011		2010		2011		2010
Ameren Missouri	$	13	$	10	$	39	$	31	$	3	$	3	$	8	$	8
Ameren Illinois		4		3		12		9		3		2		9		6
Genco		1		1		6		6		1		-		2		1
Other		2		2		3		3		-		1		-		1
Ameren(a)	$	20	$	16	$	60	$	49	$	7	$	6	$	19	$	16

(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 September 30, 2011, and its pension funding policy, Ameren expects to make annual contributions of $125 million to $150 million in each of the next five years, with aggregate estimated contributions of $690 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. In August 2011, Ameren Illinois contributed to Ameren's postretirement benefit VEBA trust an incremental $100 million in excess of Ameren Illinois' annual postretirement net periodic cost for regulatory purposes. This cash contribution will reduce future postretirement net periodic cost to the extent expected returns are achieved on the contribution.

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

	Pension Benefits(a)												Postretirement Benefits(a)
	Three Months						Nine Months						Three Months						Nine Months
	2011			2010			2011			2010			2011			2010			2011			2010
Service cost	$	19		$	18		$	57		$	51		$	6		$	5		$	17		$	15
Interest cost		45			45			135			138			15			16			44			46
Expected return on plan assets		(54	)		(53	)		(162	)		(159	)		(14	)		(14	)		(41	)		(42	)
Amortization of:
Transition obligation		-			-			-			-			1			1			2			2
Prior service cost (benefit)		-			1			(1	)		5			(2	)		(2	)		(6	)		(6	)
Actuarial loss		10			5			31			14			1			-			3			1
Net periodic cost	$	20		$	16		$	60		$	49		$	7		$	6		$	19		$	16

(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 nine months ended September 30, 2011, and 2010:

	Pension Costs								Postretirement Costs
	Three Months				Nine Months				Three Months				Nine Months
	2011		2010		2011		2010		2011		2010		2011		2010
Ameren Missouri	$	13	$	10	$	39	$	31	$	3	$	3	$	8	$	8
Ameren Illinois		4		3		12		9		3		2		9		6
Genco		1		1		6		6		1		-		2		1
Other		2		2		3		3		-		1		-		1
Ameren(a)	$	20	$	16	$	60	$	49	$	7	$	6	$	19	$	16

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