NOTE 14 – RELATED PARTY TRANSACTIONS

The Ameren Companies have engaged in, and may in the future engage in, affiliate transactions in the normal course of business. These transactions primarily consist of natural gas and power purchases and sales, services received or rendered, and borrowings and lendings. Transactions between affiliates are reported as intercompany transactions on their financial statements, but are eliminated in consolidation for Ameren's financial statements. Below are the material related party agreements.

Electric Power Supply Agreements

Genco Power Supply Agreements

The following table presents the amount of physical gigawatthour sales under Genco's related party electric power supply agreements with Marketing Company, including EEI's power supply agreement with Marketing Company, for the years ended December 31, 2011, 2010, and 2009:

December 31,

2011

2010

2009

Genco sales to Marketing Company

21,040

21,656

19,598

Genco entered into a power supply agreement, as amended (PSA), with Marketing Company, whereby Genco agreed to sell and Marketing Company agreed to purchase all of the capacity and energy available from Genco's generation fleet. Marketing Company entered into a similar PSA with AERG. Under the PSAs, revenues allocated between Genco and AERG are based on reimbursable expenses and generation. Each PSA will continue through December 31, 2022, and from year to year thereafter unless either party to the respective PSA elects to terminate the PSA by providing the other party with no less than six months advance written notice.

In December 2005, EEI entered into a PSA with Marketing Company, whereby EEI agreed to sell and Marketing Company agreed to purchase all of the capacity and energy available from EEI's generation fleet. The price that Marketing Company pays for capacity is set annually based upon prevailing market prices. Marketing Company pays spot market prices for the associated energy. In addition, EEI will at times purchase energy from Marketing Company to fulfill obligations to a nonaffiliated party. This PSA will continue through May 31, 2016, unless either party elects to terminate the PSA by providing the other party with no less than four years advance written notice or five days' written notice in the event of a default, unless the default is cured within 30 business days.

Capacity Supply Agreements

Ameren Illinois, as an electric load-serving entity, must acquire capacity sufficient to meet its obligations to customers.

Ameren Illinois used RFP processes in early 2008, pursuant to the 2007 Illinois Electric Settlement Agreement, to contract for the necessary capacity requirements for the period from June 1, 2008, through May 31, 2009. Both Marketing Company and Ameren Missouri were among the winning suppliers in the capacity RFPs. Marketing Company contracted to supply a portion of Ameren Illinois' capacity requirements for $6 million. In addition, Ameren Missouri contracted to supply a portion of the Ameren Illinois' capacity for $1 million.

In 2009, Ameren Illinois used a RFP process, administered by the IPA, to contract capacity for the period from June 1, 2009, through May 31, 2012. Both Marketing Company and Ameren Missouri were among the winning suppliers in the capacity RFP process. In April 2009, Marketing Company contracted to supply a portion of Ameren Illinois' capacity requirements to Ameren Illinois for $4 million, $9 million, and $8 million for the 12 months ending May 31, 2010, 2011, and 2012, respectively. In April 2009, Ameren Missouri contracted to supply a portion of Ameren Illinois' capacity requirements to Ameren Illinois for $2 million, $2 million, and $1 million for the 12 months ending May 31, 2010, 2011, and 2012, respectively.

In 2010, Ameren Illinois used a RFP process, administered by the IPA, to contract capacity for the period from June 1, 2010, through May 31, 2013. Both Marketing Company and Ameren Missouri were among the winning suppliers in the capacity RFP process. In April 2010, Marketing Company contracted to supply a portion of Ameren Illinois' capacity requirements to Ameren Illinois for $1 million, $2 million, and $3 million for the 12 months ending May 31, 2011, 2012, and 2013, respectively. In April 2010, Ameren Missouri contracted to supply a portion of Ameren Illinois' capacity requirements to Ameren Illinois for less than $1 million for the period from June 1, 2010, through May 31, 2013.

Energy Swaps and Energy Products

Ameren Illinois, as an electric load-serving entity, must acquire energy sufficient to meet its obligations to customers.

As part of the 2007 Illinois Electric Settlement Agreement, Ameren Illinois entered into financial contracts with Marketing Company (for the benefit of Genco and AERG) to lock in energy prices for 400 to 1,000 megawatts annually of its round-the-clock power requirements during the period June 1, 2008, to December 31, 2012, at then-relevant market prices. These financial contracts do not include capacity, are not load-following products, and do not involve the physical delivery of energy. These financial contracts are derivative instruments. They are accounted for as cash flow hedges by Marketing Company and as derivatives subject to regulatory deferral by Ameren Illinois. Consequently, Ameren Illinois and Marketing Company record the fair value of the contracts on their respective balance sheets and the changes to the fair value in regulatory assets or liabilities for Ameren Illinois and OCI at Marketing Company. See Note 7 – Derivative Financial Instruments for additional information on these derivatives. Below are the remaining contracted volumes and prices per megawatthour as of December 31, 2011:


Period	Volume		Price per Megawatthour
January 1, 2012 – December 31, 2012		1,000 MW	$	53.08

Ameren Illinois used RFP processes in early 2008, pursuant to the 2007 Illinois Electric Settlement Agreement, to contract for the necessary financial energy swaps required for the period from June 1, 2008, through May 31, 2009. Marketing Company was a winning supplier in Ameren Illinois' energy swap RFP process. Marketing Company entered into financial instruments that fixed the price that Ameren Illinois paid for about 2 million megawatthours at approximately $60 per megawatthour.

In 2009, Ameren Illinois used a RFP process, administered by the IPA, to procure financial energy swaps from June 1, 2009, through May 31, 2011. Marketing Company was a winning supplier in the financial energy swap RFP process. In May 2009, Marketing Company entered into financial instruments that fixed the price that Ameren Illinois paid for approximately 80,000 megawatthours at approximately $48 per megawatthour during the 12 months ending May 31, 2010, and for approximately 89,000 megawatthours at approximately $48 per megawatthour during the 12 months ending May 31, 2011.

In 2010, Ameren Illinois used a RFP process, administered by the IPA, to procure financial energy swaps for the period from June 1, 2010, through May 31, 2013. Marketing Company was a winning supplier in the financial energy swap RFP process. In May 2010, Marketing Company entered into financial instruments that fixed the price that Ameren Illinois will pay for approximately 924,000 megawatthours at approximately $33 per megawatthour during the 12 months ending May 31, 2011, and for approximately 296,000 megawatthours at approximately $40 per megawatthour during the 12 months ending May 31, 2012.

Energy Products

In 2011, Ameren Illinois used a RFP process administered by the IPA to procure energy products that will settle physically from June 1, 2011, through May 31, 2014. Marketing Company and Ameren Missouri were winning suppliers in Ameren Illinois' energy product RFP process. In May 2011, Marketing Company and Ameren Illinois entered into energy product agreements by which Marketing Company will sell and Ameren Illinois will purchase approximately 1,747,200 megawatthours at approximately $37 per megawatthour during the 12 months ending May 31, 2012, approximately 1,840,800 megawatthours at approximately $42 per megawatthour during the 12 months ending May 31, 2013, and approximately 650,000 megawatthours at approximately $42 per megawatthour during the 12 months ending May 31, 2014. In May 2011, Ameren Missouri and Ameren Illinois entered into energy product agreements by which Ameren Missouri will sell and Ameren Illinois will purchase approximately 16,800 megawatthours at approximately $37 per megawatthour during the 12 months ending May 31, 2012, approximately 40,800 megawatthours at approximately $29 per megawatthour during the 12 months ending May 31, 2013, and approximately 40,800 megawatthours at approximately $28 per megawatthour during the 12 months ending May 31, 2014. The 2012 and 2013 energy product agreements between Ameren Missouri and Ameren Illinois are for off-peak hours only.

In February 2012, a rate stability procurement for energy products that will settle physically was administered by the IPA for the June 2013 through May 2017 period to meet certain requirements for purchased power related to the IEIMA. Marketing Company was a winning supplier in Ameren Illinois' energy product procurement process. In February 2012, Marketing Company and Ameren Illinois entered into energy product agreements pursuant to which Marketing Company will sell and Ameren Illinois will purchase approximately 3,942,000 megawatthours at approximately $30 per megawatthour during the 12 months ending May 31, 2014, approximately 3,504,000 megawatthours at approximately $32 per megawatthour during the 12 months ending May 31, 2015, and approximately 1,317,600 megawatthours at approximately $34 per megawatthour during the 12 months ending May 31, 2016. The energy product agreements were based on around-the-clock prices.

Interconnection and Transmission Agreements

Ameren Missouri and Ameren Illinois are parties to an interconnection agreement for the use of their respective transmission lines and other facilities for the distribution of power. These agreements have no contractual expiration date, but may be terminated by either party with three years' notice.

Joint Ownership Agreement

ATXI and Ameren Illinois have a joint ownership agreement to construct, own, operate, and maintain certain electric transmission assets in Illinois. Under the terms of this agreement, Ameren Illinois and ATXI are responsible for their applicable share of all costs related to the construction, operation, and maintenance of electric transmission systems. Ameren is the primary beneficiary of ATXI, and therefore consolidates ATXI. Currently, there are no construction projects or joint ownership of existing assets under this agreement.

In January 2011, ATXI repaid advances for the construction of transmission assets to Ameren Illinois in the amount of $52 million, including $3 million of accrued interest.

In March 2011, Ameren Illinois and ATXI signed an agreement to transfer, at cost, all of ATXI's construction work in progress assets related to the construction of a transmission line to Ameren Illinois for $20 million. In April 2011, Ameren Illinois paid ATXI for these assets.

Support Services Agreements

Ameren Services provides support services to its affiliates. The costs of support services, including wages, employee benefits, professional services, and other expenses, are based on, or are an allocation of, actual costs incurred. AFS provided support services to its affiliates through December 31, 2010. Effective January 1, 2011, the services previously performed by AFS are performed within the Ameren Missouri, Ameren Illinois and Merchant Generation business segments. In addition, Ameren Missouri, Ameren Illinois and Genco provide affiliates, primarily Ameren Services, with access to their facilities for administrative purposes. The cost of the rent and facility services are based on, or are an allocation of, actual costs incurred.

Gas Sales and Transportation Agreement

Under a gas transportation agreement, Genco acquires gas transportation service from Ameren Missouri. This agreement expires in February 2016.

Money Pools

See Note 5 – Long-term Debt and Equity Financings for discussion of affiliate borrowing arrangements.

Collateral Postings

Under the terms of the 2011, 2010, and 2009 Illinois power procurement agreements entered into through a RFP process administered by the IPA, suppliers must post collateral under certain market conditions to protect Ameren Illinois in the event of nonperformance. The collateral postings are unilateral, meaning that only the suppliers would be required to post collateral. Therefore, Ameren Missouri, as a winning supplier of capacity and energy products, and Marketing Company, as a winning supplier of capacity, financial energy swaps, and energy products, may be required to post collateral. As of December 31, 2011, and 2010, there were no collateral postings required of Ameren Missouri or Marketing Company related to the 2011, 2010, and 2009 Illinois power procurement agreements.

Intercompany Transfers

On October 1, 2010, Ameren Illinois distributed AERG's common stock to Ameren in connection with the Ameren Illinois Merger. Ameren subsequently contributed the AERG common stock to AER. The distribution of AERG

common stock was accounted for as a transaction between entities under common control; therefore, Ameren Illinois transferred AERG to Ameren based on AERG's carrying

value. See Note 16 – Corporate Reorganization and Discontinued Operations for additional information.

The following table presents the impact on Ameren Missouri, Ameren Illinois and Genco, of related party transactions for the years ended December 31, 2011, 2010, and 2009. It is based primarily on the agreements discussed above and the money pool arrangements discussed in Note 4 – Short-Term Debt and Liquidity.


Agreement	Income Statement Line Item		Ameren Missouri			Ameren Illinois			Genco
Genco and EEI power supply	Operating Revenues	2011	$	(a	)	$	(a	)	$	1,006
agreements with Marketing Company		2010		(a	)		(a	)		1,059
		2009		(a	)		(a	)		1,071
Ameren Missouri power supply agreements	Operating Revenues	2011		2			(a	)		(a	)
with Ameren Illinois		2010		2			(a	)		(a	)
		2009		3			(a	)		(a	)
Ameren Missouri and Genco gas	Operating Revenues	2011		1			(a	)		(a	)
transportation agreement		2010		1			(a	)		(a	)
		2009		1			(a	)		(a	)
Genco gas sales to Medina Valley	Operating Revenues	2011		(a	)		(a	)		3
		2010		(a	)		(a	)		2
		2009		(a	)		(a	)		1
Genco gas sales to distribution companies	Operating Revenues	2011		(a	)		(a	)		-
		2010		(a	)		(a	)		1
		2009		(a	)		(a	)		2
Ameren Missouri, Ameren Illinois	Operating Revenues	2011		16			1			-
and Genco rent and facility services		2010		16			1			1
		2009		18			1			1
Total Operating Revenues		2011	$	19		$	1		$	1,009
		2010		19			1			1,063
		2009		22			1			1,075
Ameren Missouri and Genco gas	Fuel	2011	$	(a	)	$	(a	)	$	1
transportation agreement		2010		(a	)		(a	)		1
		2009		(a	)		(a	)		1
Ameren Illinois power supply agreements	Purchased Power	2011	$	(a	)	$	232		$	(a	)
with Marketing Company		2010		(a	)		233			(a	)
		2009		(a	)		400			(a	)
Ameren Illinois power supply	Purchased Power	2011		(a	)		2			(a	)
agreements with Ameren Missouri		2010		(a	)		2			(a	)
		2009		(a	)		3			(a	)
Ameren Illinois ancillary services agreement	Purchased Power	2011		(a	)		-			(a	)
with Marketing Company		2010		(a	)		-			(a	)
		2009		(a	)		(b	)		(a	)
EEI power supply agreement with	Purchased Power	2011		(a	)		(a	)		36
Marketing Company		2010		(a	)		(a	)		11
		2009		(a	)		(a	)		42
Total Purchased Power		2011	$	(a	)	$	234		$	37
		2010		(a	)		235			12
		2009		(a	)		403			43
Gas purchases from Genco	Gas Purchased for Resale	2011	$	(a	)	$	-		$	(a	)
		2010		(a	)		1			(a	)
		2009		(a	)		2			(a	)
Ameren Services support services	Other Operations and	2011	$	114		$	90		$	19
agreement	Maintenance	2010		128			102			23
		2009		131			101			27
AFS support services agreement	Other Operations and	2011		(a	)		(a	)		(a	)
	Maintenance	2010		7			(b	)		3
		2009		7			6			3
Insurance premiums^(c)	Other Operations and	2011		(b	)		(a	)		-
	Maintenance	2010		1			(a	)		-
		2009		2			(a	)		1
Total Other Operations and		2011	$	114		$	90		$	19
Maintenance Expenses		2010		136			102			26
		2009		140			107			31
Money pool borrowings (advances)	Interest (Charges)	2011	$	-		$	-		$	(b	)
	Income	2010		-			(b	)		(b	)
		2009		-			(b	)		(1	)

(a)	Not applicable.

(b)	Amount less than $1 million.

(c)	Represents insurance premiums paid to Energy Risk Assurance Company, an affiliate for replacement power, property damage, and terrorism coverage.

Related Party Transactions

NOTE 14 – RELATED PARTY TRANSACTIONS

The Ameren Companies have engaged in, and may in the future engage in, affiliate transactions in the normal course of business. These transactions primarily consist of natural gas and power purchases and sales, services received or rendered, and borrowings and lendings. Transactions between affiliates are reported as intercompany transactions on their financial statements, but are eliminated in consolidation for Ameren's financial statements. Below are the material related party agreements.

Electric Power Supply Agreements

Genco Power Supply Agreements

The following table presents the amount of physical gigawatthour sales under Genco's related party electric power supply agreements with Marketing Company, including EEI's power supply agreement with Marketing Company, for the years ended December 31, 2011, 2010, and 2009:

December 31,

2011

2010

2009

Genco sales to Marketing Company

21,040

21,656

19,598

Genco entered into a power supply agreement, as amended (PSA), with Marketing Company, whereby Genco agreed to sell and Marketing Company agreed to purchase all of the capacity and energy available from Genco's generation fleet. Marketing Company entered into a similar PSA with AERG. Under the PSAs, revenues allocated between Genco and AERG are based on reimbursable expenses and generation. Each PSA will continue through December 31, 2022, and from year to year thereafter unless either party to the respective PSA elects to terminate the PSA by providing the other party with no less than six months advance written notice.

In December 2005, EEI entered into a PSA with Marketing Company, whereby EEI agreed to sell and Marketing Company agreed to purchase all of the capacity and energy available from EEI's generation fleet. The price that Marketing Company pays for capacity is set annually based upon prevailing market prices. Marketing Company pays spot market prices for the associated energy. In addition, EEI will at times purchase energy from Marketing Company to fulfill obligations to a nonaffiliated party. This PSA will continue through May 31, 2016, unless either party elects to terminate the PSA by providing the other party with no less than four years advance written notice or five days' written notice in the event of a default, unless the default is cured within 30 business days.

Capacity Supply Agreements

Ameren Illinois, as an electric load-serving entity, must acquire capacity sufficient to meet its obligations to customers.

Ameren Illinois used RFP processes in early 2008, pursuant to the 2007 Illinois Electric Settlement Agreement, to contract for the necessary capacity requirements for the period from June 1, 2008, through May 31, 2009. Both Marketing Company and Ameren Missouri were among the winning suppliers in the capacity RFPs. Marketing Company contracted to supply a portion of Ameren Illinois' capacity requirements for $6 million. In addition, Ameren Missouri contracted to supply a portion of the Ameren Illinois' capacity for $1 million.

In 2009, Ameren Illinois used a RFP process, administered by the IPA, to contract capacity for the period from June 1, 2009, through May 31, 2012. Both Marketing Company and Ameren Missouri were among the winning suppliers in the capacity RFP process. In April 2009, Marketing Company contracted to supply a portion of Ameren Illinois' capacity requirements to Ameren Illinois for $4 million, $9 million, and $8 million for the 12 months ending May 31, 2010, 2011, and 2012, respectively. In April 2009, Ameren Missouri contracted to supply a portion of Ameren Illinois' capacity requirements to Ameren Illinois for $2 million, $2 million, and $1 million for the 12 months ending May 31, 2010, 2011, and 2012, respectively.

In 2010, Ameren Illinois used a RFP process, administered by the IPA, to contract capacity for the period from June 1, 2010, through May 31, 2013. Both Marketing Company and Ameren Missouri were among the winning suppliers in the capacity RFP process. In April 2010, Marketing Company contracted to supply a portion of Ameren Illinois' capacity requirements to Ameren Illinois for $1 million, $2 million, and $3 million for the 12 months ending May 31, 2011, 2012, and 2013, respectively. In April 2010, Ameren Missouri contracted to supply a portion of Ameren Illinois' capacity requirements to Ameren Illinois for less than $1 million for the period from June 1, 2010, through May 31, 2013.

Energy Swaps and Energy Products

Ameren Illinois, as an electric load-serving entity, must acquire energy sufficient to meet its obligations to customers.

As part of the 2007 Illinois Electric Settlement Agreement, Ameren Illinois entered into financial contracts with Marketing Company (for the benefit of Genco and AERG) to lock in energy prices for 400 to 1,000 megawatts annually of its round-the-clock power requirements during the period June 1, 2008, to December 31, 2012, at then-relevant market prices. These financial contracts do not include capacity, are not load-following products, and do not involve the physical delivery of energy. These financial contracts are derivative instruments. They are accounted for as cash flow hedges by Marketing Company and as derivatives subject to regulatory deferral by Ameren Illinois. Consequently, Ameren Illinois and Marketing Company record the fair value of the contracts on their respective balance sheets and the changes to the fair value in regulatory assets or liabilities for Ameren Illinois and OCI at Marketing Company. See Note 7 – Derivative Financial Instruments for additional information on these derivatives. Below are the remaining contracted volumes and prices per megawatthour as of December 31, 2011:


Period	Volume		Price per Megawatthour
January 1, 2012 – December 31, 2012		1,000 MW	$	53.08

Ameren Illinois used RFP processes in early 2008, pursuant to the 2007 Illinois Electric Settlement Agreement, to contract for the necessary financial energy swaps required for the period from June 1, 2008, through May 31, 2009. Marketing Company was a winning supplier in Ameren Illinois' energy swap RFP process. Marketing Company entered into financial instruments that fixed the price that Ameren Illinois paid for about 2 million megawatthours at approximately $60 per megawatthour.

In 2009, Ameren Illinois used a RFP process, administered by the IPA, to procure financial energy swaps from June 1, 2009, through May 31, 2011. Marketing Company was a winning supplier in the financial energy swap RFP process. In May 2009, Marketing Company entered into financial instruments that fixed the price that Ameren Illinois paid for approximately 80,000 megawatthours at approximately $48 per megawatthour during the 12 months ending May 31, 2010, and for approximately 89,000 megawatthours at approximately $48 per megawatthour during the 12 months ending May 31, 2011.

In 2010, Ameren Illinois used a RFP process, administered by the IPA, to procure financial energy swaps for the period from June 1, 2010, through May 31, 2013. Marketing Company was a winning supplier in the financial energy swap RFP process. In May 2010, Marketing Company entered into financial instruments that fixed the price that Ameren Illinois will pay for approximately 924,000 megawatthours at approximately $33 per megawatthour during the 12 months ending May 31, 2011, and for approximately 296,000 megawatthours at approximately $40 per megawatthour during the 12 months ending May 31, 2012.

Energy Products

In 2011, Ameren Illinois used a RFP process administered by the IPA to procure energy products that will settle physically from June 1, 2011, through May 31, 2014. Marketing Company and Ameren Missouri were winning suppliers in Ameren Illinois' energy product RFP process. In May 2011, Marketing Company and Ameren Illinois entered into energy product agreements by which Marketing Company will sell and Ameren Illinois will purchase approximately 1,747,200 megawatthours at approximately $37 per megawatthour during the 12 months ending May 31, 2012, approximately 1,840,800 megawatthours at approximately $42 per megawatthour during the 12 months ending May 31, 2013, and approximately 650,000 megawatthours at approximately $42 per megawatthour during the 12 months ending May 31, 2014. In May 2011, Ameren Missouri and Ameren Illinois entered into energy product agreements by which Ameren Missouri will sell and Ameren Illinois will purchase approximately 16,800 megawatthours at approximately $37 per megawatthour during the 12 months ending May 31, 2012, approximately 40,800 megawatthours at approximately $29 per megawatthour during the 12 months ending May 31, 2013, and approximately 40,800 megawatthours at approximately $28 per megawatthour during the 12 months ending May 31, 2014. The 2012 and 2013 energy product agreements between Ameren Missouri and Ameren Illinois are for off-peak hours only.

In February 2012, a rate stability procurement for energy products that will settle physically was administered by the IPA for the June 2013 through May 2017 period to meet certain requirements for purchased power related to the IEIMA. Marketing Company was a winning supplier in Ameren Illinois' energy product procurement process. In February 2012, Marketing Company and Ameren Illinois entered into energy product agreements pursuant to which Marketing Company will sell and Ameren Illinois will purchase approximately 3,942,000 megawatthours at approximately $30 per megawatthour during the 12 months ending May 31, 2014, approximately 3,504,000 megawatthours at approximately $32 per megawatthour during the 12 months ending May 31, 2015, and approximately 1,317,600 megawatthours at approximately $34 per megawatthour during the 12 months ending May 31, 2016. The energy product agreements were based on around-the-clock prices.

Interconnection and Transmission Agreements

Ameren Missouri and Ameren Illinois are parties to an interconnection agreement for the use of their respective transmission lines and other facilities for the distribution of power. These agreements have no contractual expiration date, but may be terminated by either party with three years' notice.

Joint Ownership Agreement

ATXI and Ameren Illinois have a joint ownership agreement to construct, own, operate, and maintain certain electric transmission assets in Illinois. Under the terms of this agreement, Ameren Illinois and ATXI are responsible for their applicable share of all costs related to the construction, operation, and maintenance of electric transmission systems. Ameren is the primary beneficiary of ATXI, and therefore consolidates ATXI. Currently, there are no construction projects or joint ownership of existing assets under this agreement.

In January 2011, ATXI repaid advances for the construction of transmission assets to Ameren Illinois in the amount of $52 million, including $3 million of accrued interest.

In March 2011, Ameren Illinois and ATXI signed an agreement to transfer, at cost, all of ATXI's construction work in progress assets related to the construction of a transmission line to Ameren Illinois for $20 million. In April 2011, Ameren Illinois paid ATXI for these assets.

Support Services Agreements

Ameren Services provides support services to its affiliates. The costs of support services, including wages, employee benefits, professional services, and other expenses, are based on, or are an allocation of, actual costs incurred. AFS provided support services to its affiliates through December 31, 2010. Effective January 1, 2011, the services previously performed by AFS are performed within the Ameren Missouri, Ameren Illinois and Merchant Generation business segments. In addition, Ameren Missouri, Ameren Illinois and Genco provide affiliates, primarily Ameren Services, with access to their facilities for administrative purposes. The cost of the rent and facility services are based on, or are an allocation of, actual costs incurred.

Gas Sales and Transportation Agreement

Under a gas transportation agreement, Genco acquires gas transportation service from Ameren Missouri. This agreement expires in February 2016.

Money Pools

See Note 5 – Long-term Debt and Equity Financings for discussion of affiliate borrowing arrangements.

Collateral Postings

Under the terms of the 2011, 2010, and 2009 Illinois power procurement agreements entered into through a RFP process administered by the IPA, suppliers must post collateral under certain market conditions to protect Ameren Illinois in the event of nonperformance. The collateral postings are unilateral, meaning that only the suppliers would be required to post collateral. Therefore, Ameren Missouri, as a winning supplier of capacity and energy products, and Marketing Company, as a winning supplier of capacity, financial energy swaps, and energy products, may be required to post collateral. As of December 31, 2011, and 2010, there were no collateral postings required of Ameren Missouri or Marketing Company related to the 2011, 2010, and 2009 Illinois power procurement agreements.

Intercompany Transfers

On October 1, 2010, Ameren Illinois distributed AERG's common stock to Ameren in connection with the Ameren Illinois Merger. Ameren subsequently contributed the AERG common stock to AER. The distribution of AERG

common stock was accounted for as a transaction between entities under common control; therefore, Ameren Illinois transferred AERG to Ameren based on AERG's carrying

value. See Note 16 – Corporate Reorganization and Discontinued Operations for additional information.

The following table presents the impact on Ameren Missouri, Ameren Illinois and Genco, of related party transactions for the years ended December 31, 2011, 2010, and 2009. It is based primarily on the agreements discussed above and the money pool arrangements discussed in Note 4 – Short-Term Debt and Liquidity.


Agreement	Income Statement Line Item		Ameren Missouri			Ameren Illinois			Genco
Genco and EEI power supply	Operating Revenues	2011	$	(a	)	$	(a	)	$	1,006
agreements with Marketing Company		2010		(a	)		(a	)		1,059
		2009		(a	)		(a	)		1,071
Ameren Missouri power supply agreements	Operating Revenues	2011		2			(a	)		(a	)
with Ameren Illinois		2010		2			(a	)		(a	)
		2009		3			(a	)		(a	)
Ameren Missouri and Genco gas	Operating Revenues	2011		1			(a	)		(a	)
transportation agreement		2010		1			(a	)		(a	)
		2009		1			(a	)		(a	)
Genco gas sales to Medina Valley	Operating Revenues	2011		(a	)		(a	)		3
		2010		(a	)		(a	)		2
		2009		(a	)		(a	)		1
Genco gas sales to distribution companies	Operating Revenues	2011		(a	)		(a	)		-
		2010		(a	)		(a	)		1
		2009		(a	)		(a	)		2
Ameren Missouri, Ameren Illinois	Operating Revenues	2011		16			1			-
and Genco rent and facility services		2010		16			1			1
		2009		18			1			1
Total Operating Revenues		2011	$	19		$	1		$	1,009
		2010		19			1			1,063
		2009		22			1			1,075
Ameren Missouri and Genco gas	Fuel	2011	$	(a	)	$	(a	)	$	1
transportation agreement		2010		(a	)		(a	)		1
		2009		(a	)		(a	)		1
Ameren Illinois power supply agreements	Purchased Power	2011	$	(a	)	$	232		$	(a	)
with Marketing Company		2010		(a	)		233			(a	)
		2009		(a	)		400			(a	)
Ameren Illinois power supply	Purchased Power	2011		(a	)		2			(a	)
agreements with Ameren Missouri		2010		(a	)		2			(a	)
		2009		(a	)		3			(a	)
Ameren Illinois ancillary services agreement	Purchased Power	2011		(a	)		-			(a	)
with Marketing Company		2010		(a	)		-			(a	)
		2009		(a	)		(b	)		(a	)
EEI power supply agreement with	Purchased Power	2011		(a	)		(a	)		36
Marketing Company		2010		(a	)		(a	)		11
		2009		(a	)		(a	)		42
Total Purchased Power		2011	$	(a	)	$	234		$	37
		2010		(a	)		235			12
		2009		(a	)		403			43
Gas purchases from Genco	Gas Purchased for Resale	2011	$	(a	)	$	-		$	(a	)
		2010		(a	)		1			(a	)
		2009		(a	)		2			(a	)
Ameren Services support services	Other Operations and	2011	$	114		$	90		$	19
agreement	Maintenance	2010		128			102			23
		2009		131			101			27
AFS support services agreement	Other Operations and	2011		(a	)		(a	)		(a	)
	Maintenance	2010		7			(b	)		3
		2009		7			6			3
Insurance premiums^(c)	Other Operations and	2011		(b	)		(a	)		-
	Maintenance	2010		1			(a	)		-
		2009		2			(a	)		1
Total Other Operations and		2011	$	114		$	90		$	19
Maintenance Expenses		2010		136			102			26
		2009		140			107			31
Money pool borrowings (advances)	Interest (Charges)	2011	$	-		$	-		$	(b	)
	Income	2010		-			(b	)		(b	)
		2009		-			(b	)		(1	)

(a)	Not applicable.

(b)	Amount less than $1 million.

(c)	Represents insurance premiums paid to Energy Risk Assurance Company, an affiliate for replacement power, property damage, and terrorism coverage.

Related Party Transactions

NOTE 14 – RELATED PARTY TRANSACTIONS

The Ameren Companies have engaged in, and may in the future engage in, affiliate transactions in the normal course of business. These transactions primarily consist of natural gas and power purchases and sales, services received or rendered, and borrowings and lendings. Transactions between affiliates are reported as intercompany transactions on their financial statements, but are eliminated in consolidation for Ameren's financial statements. Below are the material related party agreements.

Electric Power Supply Agreements

Genco Power Supply Agreements

The following table presents the amount of physical gigawatthour sales under Genco's related party electric power supply agreements with Marketing Company, including EEI's power supply agreement with Marketing Company, for the years ended December 31, 2011, 2010, and 2009:

December 31,

2011

2010

2009

Genco sales to Marketing Company

21,040

21,656

19,598

Genco entered into a power supply agreement, as amended (PSA), with Marketing Company, whereby Genco agreed to sell and Marketing Company agreed to purchase all of the capacity and energy available from Genco's generation fleet. Marketing Company entered into a similar PSA with AERG. Under the PSAs, revenues allocated between Genco and AERG are based on reimbursable expenses and generation. Each PSA will continue through December 31, 2022, and from year to year thereafter unless either party to the respective PSA elects to terminate the PSA by providing the other party with no less than six months advance written notice.

In December 2005, EEI entered into a PSA with Marketing Company, whereby EEI agreed to sell and Marketing Company agreed to purchase all of the capacity and energy available from EEI's generation fleet. The price that Marketing Company pays for capacity is set annually based upon prevailing market prices. Marketing Company pays spot market prices for the associated energy. In addition, EEI will at times purchase energy from Marketing Company to fulfill obligations to a nonaffiliated party. This PSA will continue through May 31, 2016, unless either party elects to terminate the PSA by providing the other party with no less than four years advance written notice or five days' written notice in the event of a default, unless the default is cured within 30 business days.

Capacity Supply Agreements

Ameren Illinois, as an electric load-serving entity, must acquire capacity sufficient to meet its obligations to customers.

Ameren Illinois used RFP processes in early 2008, pursuant to the 2007 Illinois Electric Settlement Agreement, to contract for the necessary capacity requirements for the period from June 1, 2008, through May 31, 2009. Both Marketing Company and Ameren Missouri were among the winning suppliers in the capacity RFPs. Marketing Company contracted to supply a portion of Ameren Illinois' capacity requirements for $6 million. In addition, Ameren Missouri contracted to supply a portion of the Ameren Illinois' capacity for $1 million.

In 2009, Ameren Illinois used a RFP process, administered by the IPA, to contract capacity for the period from June 1, 2009, through May 31, 2012. Both Marketing Company and Ameren Missouri were among the winning suppliers in the capacity RFP process. In April 2009, Marketing Company contracted to supply a portion of Ameren Illinois' capacity requirements to Ameren Illinois for $4 million, $9 million, and $8 million for the 12 months ending May 31, 2010, 2011, and 2012, respectively. In April 2009, Ameren Missouri contracted to supply a portion of Ameren Illinois' capacity requirements to Ameren Illinois for $2 million, $2 million, and $1 million for the 12 months ending May 31, 2010, 2011, and 2012, respectively.

In 2010, Ameren Illinois used a RFP process, administered by the IPA, to contract capacity for the period from June 1, 2010, through May 31, 2013. Both Marketing Company and Ameren Missouri were among the winning suppliers in the capacity RFP process. In April 2010, Marketing Company contracted to supply a portion of Ameren Illinois' capacity requirements to Ameren Illinois for $1 million, $2 million, and $3 million for the 12 months ending May 31, 2011, 2012, and 2013, respectively. In April 2010, Ameren Missouri contracted to supply a portion of Ameren Illinois' capacity requirements to Ameren Illinois for less than $1 million for the period from June 1, 2010, through May 31, 2013.

Energy Swaps and Energy Products

Ameren Illinois, as an electric load-serving entity, must acquire energy sufficient to meet its obligations to customers.

As part of the 2007 Illinois Electric Settlement Agreement, Ameren Illinois entered into financial contracts with Marketing Company (for the benefit of Genco and AERG) to lock in energy prices for 400 to 1,000 megawatts annually of its round-the-clock power requirements during the period June 1, 2008, to December 31, 2012, at then-relevant market prices. These financial contracts do not include capacity, are not load-following products, and do not involve the physical delivery of energy. These financial contracts are derivative instruments. They are accounted for as cash flow hedges by Marketing Company and as derivatives subject to regulatory deferral by Ameren Illinois. Consequently, Ameren Illinois and Marketing Company record the fair value of the contracts on their respective balance sheets and the changes to the fair value in regulatory assets or liabilities for Ameren Illinois and OCI at Marketing Company. See Note 7 – Derivative Financial Instruments for additional information on these derivatives. Below are the remaining contracted volumes and prices per megawatthour as of December 31, 2011:


Period	Volume		Price per Megawatthour
January 1, 2012 – December 31, 2012		1,000 MW	$	53.08

Ameren Illinois used RFP processes in early 2008, pursuant to the 2007 Illinois Electric Settlement Agreement, to contract for the necessary financial energy swaps required for the period from June 1, 2008, through May 31, 2009. Marketing Company was a winning supplier in Ameren Illinois' energy swap RFP process. Marketing Company entered into financial instruments that fixed the price that Ameren Illinois paid for about 2 million megawatthours at approximately $60 per megawatthour.

In 2009, Ameren Illinois used a RFP process, administered by the IPA, to procure financial energy swaps from June 1, 2009, through May 31, 2011. Marketing Company was a winning supplier in the financial energy swap RFP process. In May 2009, Marketing Company entered into financial instruments that fixed the price that Ameren Illinois paid for approximately 80,000 megawatthours at approximately $48 per megawatthour during the 12 months ending May 31, 2010, and for approximately 89,000 megawatthours at approximately $48 per megawatthour during the 12 months ending May 31, 2011.

In 2010, Ameren Illinois used a RFP process, administered by the IPA, to procure financial energy swaps for the period from June 1, 2010, through May 31, 2013. Marketing Company was a winning supplier in the financial energy swap RFP process. In May 2010, Marketing Company entered into financial instruments that fixed the price that Ameren Illinois will pay for approximately 924,000 megawatthours at approximately $33 per megawatthour during the 12 months ending May 31, 2011, and for approximately 296,000 megawatthours at approximately $40 per megawatthour during the 12 months ending May 31, 2012.

Energy Products

In 2011, Ameren Illinois used a RFP process administered by the IPA to procure energy products that will settle physically from June 1, 2011, through May 31, 2014. Marketing Company and Ameren Missouri were winning suppliers in Ameren Illinois' energy product RFP process. In May 2011, Marketing Company and Ameren Illinois entered into energy product agreements by which Marketing Company will sell and Ameren Illinois will purchase approximately 1,747,200 megawatthours at approximately $37 per megawatthour during the 12 months ending May 31, 2012, approximately 1,840,800 megawatthours at approximately $42 per megawatthour during the 12 months ending May 31, 2013, and approximately 650,000 megawatthours at approximately $42 per megawatthour during the 12 months ending May 31, 2014. In May 2011, Ameren Missouri and Ameren Illinois entered into energy product agreements by which Ameren Missouri will sell and Ameren Illinois will purchase approximately 16,800 megawatthours at approximately $37 per megawatthour during the 12 months ending May 31, 2012, approximately 40,800 megawatthours at approximately $29 per megawatthour during the 12 months ending May 31, 2013, and approximately 40,800 megawatthours at approximately $28 per megawatthour during the 12 months ending May 31, 2014. The 2012 and 2013 energy product agreements between Ameren Missouri and Ameren Illinois are for off-peak hours only.

In February 2012, a rate stability procurement for energy products that will settle physically was administered by the IPA for the June 2013 through May 2017 period to meet certain requirements for purchased power related to the IEIMA. Marketing Company was a winning supplier in Ameren Illinois' energy product procurement process. In February 2012, Marketing Company and Ameren Illinois entered into energy product agreements pursuant to which Marketing Company will sell and Ameren Illinois will purchase approximately 3,942,000 megawatthours at approximately $30 per megawatthour during the 12 months ending May 31, 2014, approximately 3,504,000 megawatthours at approximately $32 per megawatthour during the 12 months ending May 31, 2015, and approximately 1,317,600 megawatthours at approximately $34 per megawatthour during the 12 months ending May 31, 2016. The energy product agreements were based on around-the-clock prices.

Interconnection and Transmission Agreements

Ameren Missouri and Ameren Illinois are parties to an interconnection agreement for the use of their respective transmission lines and other facilities for the distribution of power. These agreements have no contractual expiration date, but may be terminated by either party with three years' notice.

Joint Ownership Agreement

ATXI and Ameren Illinois have a joint ownership agreement to construct, own, operate, and maintain certain electric transmission assets in Illinois. Under the terms of this agreement, Ameren Illinois and ATXI are responsible for their applicable share of all costs related to the construction, operation, and maintenance of electric transmission systems. Ameren is the primary beneficiary of ATXI, and therefore consolidates ATXI. Currently, there are no construction projects or joint ownership of existing assets under this agreement.

In January 2011, ATXI repaid advances for the construction of transmission assets to Ameren Illinois in the amount of $52 million, including $3 million of accrued interest.

In March 2011, Ameren Illinois and ATXI signed an agreement to transfer, at cost, all of ATXI's construction work in progress assets related to the construction of a transmission line to Ameren Illinois for $20 million. In April 2011, Ameren Illinois paid ATXI for these assets.

Support Services Agreements

Ameren Services provides support services to its affiliates. The costs of support services, including wages, employee benefits, professional services, and other expenses, are based on, or are an allocation of, actual costs incurred. AFS provided support services to its affiliates through December 31, 2010. Effective January 1, 2011, the services previously performed by AFS are performed within the Ameren Missouri, Ameren Illinois and Merchant Generation business segments. In addition, Ameren Missouri, Ameren Illinois and Genco provide affiliates, primarily Ameren Services, with access to their facilities for administrative purposes. The cost of the rent and facility services are based on, or are an allocation of, actual costs incurred.

Gas Sales and Transportation Agreement

Under a gas transportation agreement, Genco acquires gas transportation service from Ameren Missouri. This agreement expires in February 2016.

Money Pools

See Note 5 – Long-term Debt and Equity Financings for discussion of affiliate borrowing arrangements.

Collateral Postings

Under the terms of the 2011, 2010, and 2009 Illinois power procurement agreements entered into through a RFP process administered by the IPA, suppliers must post collateral under certain market conditions to protect Ameren Illinois in the event of nonperformance. The collateral postings are unilateral, meaning that only the suppliers would be required to post collateral. Therefore, Ameren Missouri, as a winning supplier of capacity and energy products, and Marketing Company, as a winning supplier of capacity, financial energy swaps, and energy products, may be required to post collateral. As of December 31, 2011, and 2010, there were no collateral postings required of Ameren Missouri or Marketing Company related to the 2011, 2010, and 2009 Illinois power procurement agreements.

Intercompany Transfers

On October 1, 2010, Ameren Illinois distributed AERG's common stock to Ameren in connection with the Ameren Illinois Merger. Ameren subsequently contributed the AERG common stock to AER. The distribution of AERG

common stock was accounted for as a transaction between entities under common control; therefore, Ameren Illinois transferred AERG to Ameren based on AERG's carrying

value. See Note 16 – Corporate Reorganization and Discontinued Operations for additional information.

The following table presents the impact on Ameren Missouri, Ameren Illinois and Genco, of related party transactions for the years ended December 31, 2011, 2010, and 2009. It is based primarily on the agreements discussed above and the money pool arrangements discussed in Note 4 – Short-Term Debt and Liquidity.


Agreement	Income Statement Line Item		Ameren Missouri			Ameren Illinois			Genco
Genco and EEI power supply	Operating Revenues	2011	$	(a	)	$	(a	)	$	1,006
agreements with Marketing Company		2010		(a	)		(a	)		1,059
		2009		(a	)		(a	)		1,071
Ameren Missouri power supply agreements	Operating Revenues	2011		2			(a	)		(a	)
with Ameren Illinois		2010		2			(a	)		(a	)
		2009		3			(a	)		(a	)
Ameren Missouri and Genco gas	Operating Revenues	2011		1			(a	)		(a	)
transportation agreement		2010		1			(a	)		(a	)
		2009		1			(a	)		(a	)
Genco gas sales to Medina Valley	Operating Revenues	2011		(a	)		(a	)		3
		2010		(a	)		(a	)		2
		2009		(a	)		(a	)		1
Genco gas sales to distribution companies	Operating Revenues	2011		(a	)		(a	)		-
		2010		(a	)		(a	)		1
		2009		(a	)		(a	)		2
Ameren Missouri, Ameren Illinois	Operating Revenues	2011		16			1			-
and Genco rent and facility services		2010		16			1			1
		2009		18			1			1
Total Operating Revenues		2011	$	19		$	1		$	1,009
		2010		19			1			1,063
		2009		22			1			1,075
Ameren Missouri and Genco gas	Fuel	2011	$	(a	)	$	(a	)	$	1
transportation agreement		2010		(a	)		(a	)		1
		2009		(a	)		(a	)		1
Ameren Illinois power supply agreements	Purchased Power	2011	$	(a	)	$	232		$	(a	)
with Marketing Company		2010		(a	)		233			(a	)
		2009		(a	)		400			(a	)
Ameren Illinois power supply	Purchased Power	2011		(a	)		2			(a	)
agreements with Ameren Missouri		2010		(a	)		2			(a	)
		2009		(a	)		3			(a	)
Ameren Illinois ancillary services agreement	Purchased Power	2011		(a	)		-			(a	)
with Marketing Company		2010		(a	)		-			(a	)
		2009		(a	)		(b	)		(a	)
EEI power supply agreement with	Purchased Power	2011		(a	)		(a	)		36
Marketing Company		2010		(a	)		(a	)		11
		2009		(a	)		(a	)		42
Total Purchased Power		2011	$	(a	)	$	234		$	37
		2010		(a	)		235			12
		2009		(a	)		403			43
Gas purchases from Genco	Gas Purchased for Resale	2011	$	(a	)	$	-		$	(a	)
		2010		(a	)		1			(a	)
		2009		(a	)		2			(a	)
Ameren Services support services	Other Operations and	2011	$	114		$	90		$	19
agreement	Maintenance	2010		128			102			23
		2009		131			101			27
AFS support services agreement	Other Operations and	2011		(a	)		(a	)		(a	)
	Maintenance	2010		7			(b	)		3
		2009		7			6			3
Insurance premiums^(c)	Other Operations and	2011		(b	)		(a	)		-
	Maintenance	2010		1			(a	)		-
		2009		2			(a	)		1
Total Other Operations and		2011	$	114		$	90		$	19
Maintenance Expenses		2010		136			102			26
		2009		140			107			31
Money pool borrowings (advances)	Interest (Charges)	2011	$	-		$	-		$	(b	)
	Income	2010		-			(b	)		(b	)
		2009		-			(b	)		(1	)

(a)	Not applicable.

(b)	Amount less than $1 million.

(c)	Represents insurance premiums paid to Energy Risk Assurance Company, an affiliate for replacement power, property damage, and terrorism coverage.

Related Party Transactions

NOTE 14 – RELATED PARTY TRANSACTIONS

The Ameren Companies have engaged in, and may in the future engage in, affiliate transactions in the normal course of business. These transactions primarily consist of natural gas and power purchases and sales, services received or rendered, and borrowings and lendings. Transactions between affiliates are reported as intercompany transactions on their financial statements, but are eliminated in consolidation for Ameren's financial statements. Below are the material related party agreements.

Electric Power Supply Agreements

Genco Power Supply Agreements

The following table presents the amount of physical gigawatthour sales under Genco's related party electric power supply agreements with Marketing Company, including EEI's power supply agreement with Marketing Company, for the years ended December 31, 2011, 2010, and 2009:

December 31,

2011

2010

2009

Genco sales to Marketing Company

21,040

21,656

19,598

Genco entered into a power supply agreement, as amended (PSA), with Marketing Company, whereby Genco agreed to sell and Marketing Company agreed to purchase all of the capacity and energy available from Genco's generation fleet. Marketing Company entered into a similar PSA with AERG. Under the PSAs, revenues allocated between Genco and AERG are based on reimbursable expenses and generation. Each PSA will continue through December 31, 2022, and from year to year thereafter unless either party to the respective PSA elects to terminate the PSA by providing the other party with no less than six months advance written notice.

In December 2005, EEI entered into a PSA with Marketing Company, whereby EEI agreed to sell and Marketing Company agreed to purchase all of the capacity and energy available from EEI's generation fleet. The price that Marketing Company pays for capacity is set annually based upon prevailing market prices. Marketing Company pays spot market prices for the associated energy. In addition, EEI will at times purchase energy from Marketing Company to fulfill obligations to a nonaffiliated party. This PSA will continue through May 31, 2016, unless either party elects to terminate the PSA by providing the other party with no less than four years advance written notice or five days' written notice in the event of a default, unless the default is cured within 30 business days.

Capacity Supply Agreements

Ameren Illinois, as an electric load-serving entity, must acquire capacity sufficient to meet its obligations to customers.

Ameren Illinois used RFP processes in early 2008, pursuant to the 2007 Illinois Electric Settlement Agreement, to contract for the necessary capacity requirements for the period from June 1, 2008, through May 31, 2009. Both Marketing Company and Ameren Missouri were among the winning suppliers in the capacity RFPs. Marketing Company contracted to supply a portion of Ameren Illinois' capacity requirements for $6 million. In addition, Ameren Missouri contracted to supply a portion of the Ameren Illinois' capacity for $1 million.

In 2009, Ameren Illinois used a RFP process, administered by the IPA, to contract capacity for the period from June 1, 2009, through May 31, 2012. Both Marketing Company and Ameren Missouri were among the winning suppliers in the capacity RFP process. In April 2009, Marketing Company contracted to supply a portion of Ameren Illinois' capacity requirements to Ameren Illinois for $4 million, $9 million, and $8 million for the 12 months ending May 31, 2010, 2011, and 2012, respectively. In April 2009, Ameren Missouri contracted to supply a portion of Ameren Illinois' capacity requirements to Ameren Illinois for $2 million, $2 million, and $1 million for the 12 months ending May 31, 2010, 2011, and 2012, respectively.

In 2010, Ameren Illinois used a RFP process, administered by the IPA, to contract capacity for the period from June 1, 2010, through May 31, 2013. Both Marketing Company and Ameren Missouri were among the winning suppliers in the capacity RFP process. In April 2010, Marketing Company contracted to supply a portion of Ameren Illinois' capacity requirements to Ameren Illinois for $1 million, $2 million, and $3 million for the 12 months ending May 31, 2011, 2012, and 2013, respectively. In April 2010, Ameren Missouri contracted to supply a portion of Ameren Illinois' capacity requirements to Ameren Illinois for less than $1 million for the period from June 1, 2010, through May 31, 2013.

Energy Swaps and Energy Products

Ameren Illinois, as an electric load-serving entity, must acquire energy sufficient to meet its obligations to customers.

As part of the 2007 Illinois Electric Settlement Agreement, Ameren Illinois entered into financial contracts with Marketing Company (for the benefit of Genco and AERG) to lock in energy prices for 400 to 1,000 megawatts annually of its round-the-clock power requirements during the period June 1, 2008, to December 31, 2012, at then-relevant market prices. These financial contracts do not include capacity, are not load-following products, and do not involve the physical delivery of energy. These financial contracts are derivative instruments. They are accounted for as cash flow hedges by Marketing Company and as derivatives subject to regulatory deferral by Ameren Illinois. Consequently, Ameren Illinois and Marketing Company record the fair value of the contracts on their respective balance sheets and the changes to the fair value in regulatory assets or liabilities for Ameren Illinois and OCI at Marketing Company. See Note 7 – Derivative Financial Instruments for additional information on these derivatives. Below are the remaining contracted volumes and prices per megawatthour as of December 31, 2011:


Period	Volume		Price per Megawatthour
January 1, 2012 – December 31, 2012		1,000 MW	$	53.08

Ameren Illinois used RFP processes in early 2008, pursuant to the 2007 Illinois Electric Settlement Agreement, to contract for the necessary financial energy swaps required for the period from June 1, 2008, through May 31, 2009. Marketing Company was a winning supplier in Ameren Illinois' energy swap RFP process. Marketing Company entered into financial instruments that fixed the price that Ameren Illinois paid for about 2 million megawatthours at approximately $60 per megawatthour.

In 2009, Ameren Illinois used a RFP process, administered by the IPA, to procure financial energy swaps from June 1, 2009, through May 31, 2011. Marketing Company was a winning supplier in the financial energy swap RFP process. In May 2009, Marketing Company entered into financial instruments that fixed the price that Ameren Illinois paid for approximately 80,000 megawatthours at approximately $48 per megawatthour during the 12 months ending May 31, 2010, and for approximately 89,000 megawatthours at approximately $48 per megawatthour during the 12 months ending May 31, 2011.

In 2010, Ameren Illinois used a RFP process, administered by the IPA, to procure financial energy swaps for the period from June 1, 2010, through May 31, 2013. Marketing Company was a winning supplier in the financial energy swap RFP process. In May 2010, Marketing Company entered into financial instruments that fixed the price that Ameren Illinois will pay for approximately 924,000 megawatthours at approximately $33 per megawatthour during the 12 months ending May 31, 2011, and for approximately 296,000 megawatthours at approximately $40 per megawatthour during the 12 months ending May 31, 2012.

Energy Products

In 2011, Ameren Illinois used a RFP process administered by the IPA to procure energy products that will settle physically from June 1, 2011, through May 31, 2014. Marketing Company and Ameren Missouri were winning suppliers in Ameren Illinois' energy product RFP process. In May 2011, Marketing Company and Ameren Illinois entered into energy product agreements by which Marketing Company will sell and Ameren Illinois will purchase approximately 1,747,200 megawatthours at approximately $37 per megawatthour during the 12 months ending May 31, 2012, approximately 1,840,800 megawatthours at approximately $42 per megawatthour during the 12 months ending May 31, 2013, and approximately 650,000 megawatthours at approximately $42 per megawatthour during the 12 months ending May 31, 2014. In May 2011, Ameren Missouri and Ameren Illinois entered into energy product agreements by which Ameren Missouri will sell and Ameren Illinois will purchase approximately 16,800 megawatthours at approximately $37 per megawatthour during the 12 months ending May 31, 2012, approximately 40,800 megawatthours at approximately $29 per megawatthour during the 12 months ending May 31, 2013, and approximately 40,800 megawatthours at approximately $28 per megawatthour during the 12 months ending May 31, 2014. The 2012 and 2013 energy product agreements between Ameren Missouri and Ameren Illinois are for off-peak hours only.

In February 2012, a rate stability procurement for energy products that will settle physically was administered by the IPA for the June 2013 through May 2017 period to meet certain requirements for purchased power related to the IEIMA. Marketing Company was a winning supplier in Ameren Illinois' energy product procurement process. In February 2012, Marketing Company and Ameren Illinois entered into energy product agreements pursuant to which Marketing Company will sell and Ameren Illinois will purchase approximately 3,942,000 megawatthours at approximately $30 per megawatthour during the 12 months ending May 31, 2014, approximately 3,504,000 megawatthours at approximately $32 per megawatthour during the 12 months ending May 31, 2015, and approximately 1,317,600 megawatthours at approximately $34 per megawatthour during the 12 months ending May 31, 2016. The energy product agreements were based on around-the-clock prices.

Interconnection and Transmission Agreements

Ameren Missouri and Ameren Illinois are parties to an interconnection agreement for the use of their respective transmission lines and other facilities for the distribution of power. These agreements have no contractual expiration date, but may be terminated by either party with three years' notice.

Joint Ownership Agreement

ATXI and Ameren Illinois have a joint ownership agreement to construct, own, operate, and maintain certain electric transmission assets in Illinois. Under the terms of this agreement, Ameren Illinois and ATXI are responsible for their applicable share of all costs related to the construction, operation, and maintenance of electric transmission systems. Ameren is the primary beneficiary of ATXI, and therefore consolidates ATXI. Currently, there are no construction projects or joint ownership of existing assets under this agreement.

In January 2011, ATXI repaid advances for the construction of transmission assets to Ameren Illinois in the amount of $52 million, including $3 million of accrued interest.

In March 2011, Ameren Illinois and ATXI signed an agreement to transfer, at cost, all of ATXI's construction work in progress assets related to the construction of a transmission line to Ameren Illinois for $20 million. In April 2011, Ameren Illinois paid ATXI for these assets.

Support Services Agreements

Ameren Services provides support services to its affiliates. The costs of support services, including wages, employee benefits, professional services, and other expenses, are based on, or are an allocation of, actual costs incurred. AFS provided support services to its affiliates through December 31, 2010. Effective January 1, 2011, the services previously performed by AFS are performed within the Ameren Missouri, Ameren Illinois and Merchant Generation business segments. In addition, Ameren Missouri, Ameren Illinois and Genco provide affiliates, primarily Ameren Services, with access to their facilities for administrative purposes. The cost of the rent and facility services are based on, or are an allocation of, actual costs incurred.

Gas Sales and Transportation Agreement

Under a gas transportation agreement, Genco acquires gas transportation service from Ameren Missouri. This agreement expires in February 2016.

Money Pools

See Note 5 – Long-term Debt and Equity Financings for discussion of affiliate borrowing arrangements.

Collateral Postings

Under the terms of the 2011, 2010, and 2009 Illinois power procurement agreements entered into through a RFP process administered by the IPA, suppliers must post collateral under certain market conditions to protect Ameren Illinois in the event of nonperformance. The collateral postings are unilateral, meaning that only the suppliers would be required to post collateral. Therefore, Ameren Missouri, as a winning supplier of capacity and energy products, and Marketing Company, as a winning supplier of capacity, financial energy swaps, and energy products, may be required to post collateral. As of December 31, 2011, and 2010, there were no collateral postings required of Ameren Missouri or Marketing Company related to the 2011, 2010, and 2009 Illinois power procurement agreements.

Intercompany Transfers

On October 1, 2010, Ameren Illinois distributed AERG's common stock to Ameren in connection with the Ameren Illinois Merger. Ameren subsequently contributed the AERG common stock to AER. The distribution of AERG

common stock was accounted for as a transaction between entities under common control; therefore, Ameren Illinois transferred AERG to Ameren based on AERG's carrying

value. See Note 16 – Corporate Reorganization and Discontinued Operations for additional information.

The following table presents the impact on Ameren Missouri, Ameren Illinois and Genco, of related party transactions for the years ended December 31, 2011, 2010, and 2009. It is based primarily on the agreements discussed above and the money pool arrangements discussed in Note 4 – Short-Term Debt and Liquidity.


Agreement	Income Statement Line Item		Ameren Missouri			Ameren Illinois			Genco
Genco and EEI power supply	Operating Revenues	2011	$	(a	)	$	(a	)	$	1,006
agreements with Marketing Company		2010		(a	)		(a	)		1,059
		2009		(a	)		(a	)		1,071
Ameren Missouri power supply agreements	Operating Revenues	2011		2			(a	)		(a	)
with Ameren Illinois		2010		2			(a	)		(a	)
		2009		3			(a	)		(a	)
Ameren Missouri and Genco gas	Operating Revenues	2011		1			(a	)		(a	)
transportation agreement		2010		1			(a	)		(a	)
		2009		1			(a	)		(a	)
Genco gas sales to Medina Valley	Operating Revenues	2011		(a	)		(a	)		3
		2010		(a	)		(a	)		2
		2009		(a	)		(a	)		1
Genco gas sales to distribution companies	Operating Revenues	2011		(a	)		(a	)		-
		2010		(a	)		(a	)		1
		2009		(a	)		(a	)		2
Ameren Missouri, Ameren Illinois	Operating Revenues	2011		16			1			-
and Genco rent and facility services		2010		16			1			1
		2009		18			1			1
Total Operating Revenues		2011	$	19		$	1		$	1,009
		2010		19			1			1,063
		2009		22			1			1,075
Ameren Missouri and Genco gas	Fuel	2011	$	(a	)	$	(a	)	$	1
transportation agreement		2010		(a	)		(a	)		1
		2009		(a	)		(a	)		1
Ameren Illinois power supply agreements	Purchased Power	2011	$	(a	)	$	232		$	(a	)
with Marketing Company		2010		(a	)		233			(a	)
		2009		(a	)		400			(a	)
Ameren Illinois power supply	Purchased Power	2011		(a	)		2			(a	)
agreements with Ameren Missouri		2010		(a	)		2			(a	)
		2009		(a	)		3			(a	)
Ameren Illinois ancillary services agreement	Purchased Power	2011		(a	)		-			(a	)
with Marketing Company		2010		(a	)		-			(a	)
		2009		(a	)		(b	)		(a	)
EEI power supply agreement with	Purchased Power	2011		(a	)		(a	)		36
Marketing Company		2010		(a	)		(a	)		11
		2009		(a	)		(a	)		42
Total Purchased Power		2011	$	(a	)	$	234		$	37
		2010		(a	)		235			12
		2009		(a	)		403			43
Gas purchases from Genco	Gas Purchased for Resale	2011	$	(a	)	$	-		$	(a	)
		2010		(a	)		1			(a	)
		2009		(a	)		2			(a	)
Ameren Services support services	Other Operations and	2011	$	114		$	90		$	19
agreement	Maintenance	2010		128			102			23
		2009		131			101			27
AFS support services agreement	Other Operations and	2011		(a	)		(a	)		(a	)
	Maintenance	2010		7			(b	)		3
		2009		7			6			3
Insurance premiums^(c)	Other Operations and	2011		(b	)		(a	)		-
	Maintenance	2010		1			(a	)		-
		2009		2			(a	)		1
Total Other Operations and		2011	$	114		$	90		$	19
Maintenance Expenses		2010		136			102			26
		2009		140			107			31
Money pool borrowings (advances)	Interest (Charges)	2011	$	-		$	-		$	(b	)
	Income	2010		-			(b	)		(b	)
		2009		-			(b	)		(1	)

(a)	Not applicable.

(b)	Amount less than $1 million.

(c)	Represents insurance premiums paid to Energy Risk Assurance Company, an affiliate for replacement power, property damage, and terrorism coverage.