NOTE 8 - 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. For a discussion of our material related party agreements, see Note 14 - Related Party Transactions under Part II, Item 8, of the Form 10-K.

Put Option Agreement and Guaranty

On March 28, 2012, Genco entered into a put option agreement with AERG. The put option gives Genco the option to sell to AERG all, but not less than all, of the Grand Tower, the Gibson City, and the Elgin energy centers. If Genco exercises the put option, the purchase price for all three energy centers will be the greater of $100 million or the fair market value of the energy centers, as determined by three third-party appraisers in accordance with the terms of the agreement. Upon exercise of the put option, the $100 million minimum purchase price would be payable to Genco within one business day. Genco may exercise the put option at any time from March 28, 2012 through March 28, 2014. The put option may be extended indefinitely for additional one-year periods by agreement of AERG and Genco. If Genco exercises the put option, the closing of the sale of all three energy centers will be subject to the receipt of all necessary regulatory approvals. In exchange for entering into the put option agreement, Genco paid AERG a put option premium of $2.5 million. The put option premium paid by Genco was recorded as an “Other asset” on Genco’s consolidated balance sheet and is being amortized over two years. The amortization expense is eliminated in the consolidation of Ameren’s financial statements.

The put option agreement requires AERG to secure and maintain an Ameren guaranty of payment of contingent obligations under the agreement. Ameren and AERG entered into such a guaranty agreement on March 28, 2012. The guaranty shall remain in effect until either AERG or Ameren satisfies all of the payment obligations under the put option agreement, or the put option agreement is terminated and no further payments are owed by AERG to Genco. As of June 30, 2012, Genco had not exercised the put option.

Intercompany Transfers

In June 2012, Genco transferred various assets from the Hutsonville and Meredosia energy centers to AERG. Both of the energy centers were retired in 2011. Genco recorded an intercompany receivable in the amount of less than $1 million at June 30, 2012. The transfer of the assets was accounted for as a transaction between entities under common control; therefore, Genco did not recognize a gain on the transfer, and upon consolidation Ameren recorded the assets at carrying value.

Electric Power Supply Agreements

During the second quarter of 2012, Ameren Illinois used a RFP process, administered by the IPA, to contract capacity for the period from June 1, 2012, through May 31, 2015. Both Marketing Company and Ameren Missouri were among the winning suppliers in the capacity RFP process. In April 2012, Marketing Company contracted to supply a portion of Ameren Illinois’ capacity requirements for less than $1 million and $4 million for the 12 months ending May 31, 2013 and 2015, respectively. In April 2012, Ameren Missouri contracted to supply a portion of Ameren Illinois’ capacity requirements for $1 million and $3 million for the 12 months ending May 31, 2014 and 2015, respectively.

Collateral Postings

Under the terms of the 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 Marketing Company, as a winning supplier of capacity and financial energy swaps, may be required to post collateral. As of December 31, 2011 and June 30, 2012, there were no collateral postings required of Ameren Missouri or Marketing Company related to the Illinois power procurement agreements.

Marketing Company Sale of Trade Receivables to Ameren Illinois

In accordance with the Illinois Public Utilities Act, Ameren Illinois is required to purchase alternative retail electric suppliers’ receivables relating to Ameren Illinois’ delivery service customers who elected to receive power supply from the alternative retail electric supplier. Beginning in June 2012, Marketing Company sold and Ameren Illinois purchased trade receivables relating to the power supply of residential customers using Marketing Company as their alternative retail electric supplier. Marketing Company has no continuing involvement with or control over the trade receivables after the sale is completed to Ameren Illinois, and neither company has any restrictions on the assets associated with these purchase and sale transactions. As of June 30, 2012, Ameren Illinois’ payable to Marketing Company for the purchase of trade receivables totaled less than $1 million. For the six months ended June 30, 2012 Ameren Illinois purchased less than $1 million of trade receivables from Marketing Company. Marketing Company’s receivable from Ameren Illinois as well as Ameren Illinois’ payable to Marketing Company are eliminated in the consolidated Ameren Corporation’s financial statements.

Money Pools

See Note 3 - Short-term Debt and Liquidity for a discussion of affiliate borrowing arrangements.

The following table presents the impact on Ameren Missouri, Ameren Illinois and Genco of related party transactions for the three and six months ended June 30, 2012, and 2011. It is based primarily on the agreements discussed above and in Note 14 - Related Party Transactions under Part II, Item 8, of the Form 10-K, and the money pool arrangements discussed in Note 3 - Short-term Debt and Liquidity of this report.


			Three Months									Six Months
Agreement	Income Statement Line Item		Ameren Missouri			Ameren Illinois			Genco			Ameren Missouri			Ameren Illinois			Genco
Genco and EEI power supply	Operating Revenues	2012	$	(a	)	$	(a	)	$	193		$	(a	)	$	(a	)	$	386
agreements with Marketing Company		2011		(a	)		(a	)		242			(a	)		(a	)		482
Ameren Missouri and Ameren Illinois	Operating Revenues	2012		4			(b	)		(a	)		8			(b	)		(a	)
rent and facility services		2011		4			(b	)		(a	)		8			(b	)		(a	)
Ameren Missouri and Genco gas	Operating Revenues	2012		(b	)		(a	)		(b	)		(b	)		(a	)		(b	)
transportation agreement		2011		(b	)		(a	)		(b	)		(b	)		(a	)		(b	)
Total Operating Revenues		2012	$	4		$	(b	)	$	193		$	8		$	(b	)	$	386
		2011		4			(b	)		242			8			(b	)		482
Ameren Illinois power supply	Purchased Power	2012	$	(a	)	$	72		$	(a	)	$	(a	)	$	160		$	(a	)
agreements with Marketing Company		2011		(a	)		48			(a	)		(a	)		94			(a	)
EEI power supply agreement with	Purchased Power	2012		(a	)		(a	)		(b	)		(a	)		(a	)		(b	)
Marketing Company		2011		(a	)		(a	)		12			(a	)		(a	)		12
Total Purchased Power		2012	$	(a	)	$	72		$	(b	)	$	(a	)	$	160		$	(b	)
		2011		(a	)		48			12			(a	)		94			12
Ameren Services support services	Other Operations	2012	$	27		$	22		$	5		$	55		$	45		$	10
agreement	and Maintenance	2011		28			21			4			59			45			10
Insurance premiums^(c)	Other Operations	2012		(b	)		(a	)		(a	)		(b	)		(a	)		(a	)
	and Maintenance	2011		(b	)		(a	)		(a	)		(b	)		(a	)		(a	)
Total Other Operations and		2012	$	27		$	22		$	5		$	55		$	45		$	10
Maintenance Expenses		2011		28			21			4			59			45			10
Money pool borrowings (advances)	Interest Charges	2012	$	-		$	(b	)	$	(b	)	$	-		$	(b	)	$	(b	)
		2011		-			-			(b	)		-			-			(b	)

(a)	Not applicable.

(b)	Amount less than $1 million.

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

Related Party Transactions

NOTE 8 - 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. For a discussion of our material related party agreements, see Note 14 - Related Party Transactions under Part II, Item 8, of the Form 10-K.

Put Option Agreement and Guaranty

On March 28, 2012, Genco entered into a put option agreement with AERG. The put option gives Genco the option to sell to AERG all, but not less than all, of the Grand Tower, the Gibson City, and the Elgin energy centers. If Genco exercises the put option, the purchase price for all three energy centers will be the greater of $100 million or the fair market value of the energy centers, as determined by three third-party appraisers in accordance with the terms of the agreement. Upon exercise of the put option, the $100 million minimum purchase price would be payable to Genco within one business day. Genco may exercise the put option at any time from March 28, 2012 through March 28, 2014. The put option may be extended indefinitely for additional one-year periods by agreement of AERG and Genco. If Genco exercises the put option, the closing of the sale of all three energy centers will be subject to the receipt of all necessary regulatory approvals. In exchange for entering into the put option agreement, Genco paid AERG a put option premium of $2.5 million. The put option premium paid by Genco was recorded as an “Other asset” on Genco’s consolidated balance sheet and is being amortized over two years. The amortization expense is eliminated in the consolidation of Ameren’s financial statements.

The put option agreement requires AERG to secure and maintain an Ameren guaranty of payment of contingent obligations under the agreement. Ameren and AERG entered into such a guaranty agreement on March 28, 2012. The guaranty shall remain in effect until either AERG or Ameren satisfies all of the payment obligations under the put option agreement, or the put option agreement is terminated and no further payments are owed by AERG to Genco. As of June 30, 2012, Genco had not exercised the put option.

Intercompany Transfers

In June 2012, Genco transferred various assets from the Hutsonville and Meredosia energy centers to AERG. Both of the energy centers were retired in 2011. Genco recorded an intercompany receivable in the amount of less than $1 million at June 30, 2012. The transfer of the assets was accounted for as a transaction between entities under common control; therefore, Genco did not recognize a gain on the transfer, and upon consolidation Ameren recorded the assets at carrying value.

Electric Power Supply Agreements

During the second quarter of 2012, Ameren Illinois used a RFP process, administered by the IPA, to contract capacity for the period from June 1, 2012, through May 31, 2015. Both Marketing Company and Ameren Missouri were among the winning suppliers in the capacity RFP process. In April 2012, Marketing Company contracted to supply a portion of Ameren Illinois’ capacity requirements for less than $1 million and $4 million for the 12 months ending May 31, 2013 and 2015, respectively. In April 2012, Ameren Missouri contracted to supply a portion of Ameren Illinois’ capacity requirements for $1 million and $3 million for the 12 months ending May 31, 2014 and 2015, respectively.

Collateral Postings

Under the terms of the 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 Marketing Company, as a winning supplier of capacity and financial energy swaps, may be required to post collateral. As of December 31, 2011 and June 30, 2012, there were no collateral postings required of Ameren Missouri or Marketing Company related to the Illinois power procurement agreements.

Marketing Company Sale of Trade Receivables to Ameren Illinois

In accordance with the Illinois Public Utilities Act, Ameren Illinois is required to purchase alternative retail electric suppliers’ receivables relating to Ameren Illinois’ delivery service customers who elected to receive power supply from the alternative retail electric supplier. Beginning in June 2012, Marketing Company sold and Ameren Illinois purchased trade receivables relating to the power supply of residential customers using Marketing Company as their alternative retail electric supplier. Marketing Company has no continuing involvement with or control over the trade receivables after the sale is completed to Ameren Illinois, and neither company has any restrictions on the assets associated with these purchase and sale transactions. As of June 30, 2012, Ameren Illinois’ payable to Marketing Company for the purchase of trade receivables totaled less than $1 million. For the six months ended June 30, 2012 Ameren Illinois purchased less than $1 million of trade receivables from Marketing Company. Marketing Company’s receivable from Ameren Illinois as well as Ameren Illinois’ payable to Marketing Company are eliminated in the consolidated Ameren Corporation’s financial statements.

Money Pools

See Note 3 - Short-term Debt and Liquidity for a discussion of affiliate borrowing arrangements.

The following table presents the impact on Ameren Missouri, Ameren Illinois and Genco of related party transactions for the three and six months ended June 30, 2012, and 2011. It is based primarily on the agreements discussed above and in Note 14 - Related Party Transactions under Part II, Item 8, of the Form 10-K, and the money pool arrangements discussed in Note 3 - Short-term Debt and Liquidity of this report.


			Three Months									Six Months
Agreement	Income Statement Line Item		Ameren Missouri			Ameren Illinois			Genco			Ameren Missouri			Ameren Illinois			Genco
Genco and EEI power supply	Operating Revenues	2012	$	(a	)	$	(a	)	$	193		$	(a	)	$	(a	)	$	386
agreements with Marketing Company		2011		(a	)		(a	)		242			(a	)		(a	)		482
Ameren Missouri and Ameren Illinois	Operating Revenues	2012		4			(b	)		(a	)		8			(b	)		(a	)
rent and facility services		2011		4			(b	)		(a	)		8			(b	)		(a	)
Ameren Missouri and Genco gas	Operating Revenues	2012		(b	)		(a	)		(b	)		(b	)		(a	)		(b	)
transportation agreement		2011		(b	)		(a	)		(b	)		(b	)		(a	)		(b	)
Total Operating Revenues		2012	$	4		$	(b	)	$	193		$	8		$	(b	)	$	386
		2011		4			(b	)		242			8			(b	)		482
Ameren Illinois power supply	Purchased Power	2012	$	(a	)	$	72		$	(a	)	$	(a	)	$	160		$	(a	)
agreements with Marketing Company		2011		(a	)		48			(a	)		(a	)		94			(a	)
EEI power supply agreement with	Purchased Power	2012		(a	)		(a	)		(b	)		(a	)		(a	)		(b	)
Marketing Company		2011		(a	)		(a	)		12			(a	)		(a	)		12
Total Purchased Power		2012	$	(a	)	$	72		$	(b	)	$	(a	)	$	160		$	(b	)
		2011		(a	)		48			12			(a	)		94			12
Ameren Services support services	Other Operations	2012	$	27		$	22		$	5		$	55		$	45		$	10
agreement	and Maintenance	2011		28			21			4			59			45			10
Insurance premiums^(c)	Other Operations	2012		(b	)		(a	)		(a	)		(b	)		(a	)		(a	)
	and Maintenance	2011		(b	)		(a	)		(a	)		(b	)		(a	)		(a	)
Total Other Operations and		2012	$	27		$	22		$	5		$	55		$	45		$	10
Maintenance Expenses		2011		28			21			4			59			45			10
Money pool borrowings (advances)	Interest Charges	2012	$	-		$	(b	)	$	(b	)	$	-		$	(b	)	$	(b	)
		2011		-			-			(b	)		-			-			(b	)

(a)	Not applicable.

(b)	Amount less than $1 million.

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

Related Party Transactions

NOTE 8 - 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. For a discussion of our material related party agreements, see Note 14 - Related Party Transactions under Part II, Item 8, of the Form 10-K.

Put Option Agreement and Guaranty

On March 28, 2012, Genco entered into a put option agreement with AERG. The put option gives Genco the option to sell to AERG all, but not less than all, of the Grand Tower, the Gibson City, and the Elgin energy centers. If Genco exercises the put option, the purchase price for all three energy centers will be the greater of $100 million or the fair market value of the energy centers, as determined by three third-party appraisers in accordance with the terms of the agreement. Upon exercise of the put option, the $100 million minimum purchase price would be payable to Genco within one business day. Genco may exercise the put option at any time from March 28, 2012 through March 28, 2014. The put option may be extended indefinitely for additional one-year periods by agreement of AERG and Genco. If Genco exercises the put option, the closing of the sale of all three energy centers will be subject to the receipt of all necessary regulatory approvals. In exchange for entering into the put option agreement, Genco paid AERG a put option premium of $2.5 million. The put option premium paid by Genco was recorded as an “Other asset” on Genco’s consolidated balance sheet and is being amortized over two years. The amortization expense is eliminated in the consolidation of Ameren’s financial statements.

The put option agreement requires AERG to secure and maintain an Ameren guaranty of payment of contingent obligations under the agreement. Ameren and AERG entered into such a guaranty agreement on March 28, 2012. The guaranty shall remain in effect until either AERG or Ameren satisfies all of the payment obligations under the put option agreement, or the put option agreement is terminated and no further payments are owed by AERG to Genco. As of June 30, 2012, Genco had not exercised the put option.

Intercompany Transfers

In June 2012, Genco transferred various assets from the Hutsonville and Meredosia energy centers to AERG. Both of the energy centers were retired in 2011. Genco recorded an intercompany receivable in the amount of less than $1 million at June 30, 2012. The transfer of the assets was accounted for as a transaction between entities under common control; therefore, Genco did not recognize a gain on the transfer, and upon consolidation Ameren recorded the assets at carrying value.

Electric Power Supply Agreements

During the second quarter of 2012, Ameren Illinois used a RFP process, administered by the IPA, to contract capacity for the period from June 1, 2012, through May 31, 2015. Both Marketing Company and Ameren Missouri were among the winning suppliers in the capacity RFP process. In April 2012, Marketing Company contracted to supply a portion of Ameren Illinois’ capacity requirements for less than $1 million and $4 million for the 12 months ending May 31, 2013 and 2015, respectively. In April 2012, Ameren Missouri contracted to supply a portion of Ameren Illinois’ capacity requirements for $1 million and $3 million for the 12 months ending May 31, 2014 and 2015, respectively.

Collateral Postings

Under the terms of the 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 Marketing Company, as a winning supplier of capacity and financial energy swaps, may be required to post collateral. As of December 31, 2011 and June 30, 2012, there were no collateral postings required of Ameren Missouri or Marketing Company related to the Illinois power procurement agreements.

Marketing Company Sale of Trade Receivables to Ameren Illinois

In accordance with the Illinois Public Utilities Act, Ameren Illinois is required to purchase alternative retail electric suppliers’ receivables relating to Ameren Illinois’ delivery service customers who elected to receive power supply from the alternative retail electric supplier. Beginning in June 2012, Marketing Company sold and Ameren Illinois purchased trade receivables relating to the power supply of residential customers using Marketing Company as their alternative retail electric supplier. Marketing Company has no continuing involvement with or control over the trade receivables after the sale is completed to Ameren Illinois, and neither company has any restrictions on the assets associated with these purchase and sale transactions. As of June 30, 2012, Ameren Illinois’ payable to Marketing Company for the purchase of trade receivables totaled less than $1 million. For the six months ended June 30, 2012 Ameren Illinois purchased less than $1 million of trade receivables from Marketing Company. Marketing Company’s receivable from Ameren Illinois as well as Ameren Illinois’ payable to Marketing Company are eliminated in the consolidated Ameren Corporation’s financial statements.

Money Pools

See Note 3 - Short-term Debt and Liquidity for a discussion of affiliate borrowing arrangements.

The following table presents the impact on Ameren Missouri, Ameren Illinois and Genco of related party transactions for the three and six months ended June 30, 2012, and 2011. It is based primarily on the agreements discussed above and in Note 14 - Related Party Transactions under Part II, Item 8, of the Form 10-K, and the money pool arrangements discussed in Note 3 - Short-term Debt and Liquidity of this report.


			Three Months									Six Months
Agreement	Income Statement Line Item		Ameren Missouri			Ameren Illinois			Genco			Ameren Missouri			Ameren Illinois			Genco
Genco and EEI power supply	Operating Revenues	2012	$	(a	)	$	(a	)	$	193		$	(a	)	$	(a	)	$	386
agreements with Marketing Company		2011		(a	)		(a	)		242			(a	)		(a	)		482
Ameren Missouri and Ameren Illinois	Operating Revenues	2012		4			(b	)		(a	)		8			(b	)		(a	)
rent and facility services		2011		4			(b	)		(a	)		8			(b	)		(a	)
Ameren Missouri and Genco gas	Operating Revenues	2012		(b	)		(a	)		(b	)		(b	)		(a	)		(b	)
transportation agreement		2011		(b	)		(a	)		(b	)		(b	)		(a	)		(b	)
Total Operating Revenues		2012	$	4		$	(b	)	$	193		$	8		$	(b	)	$	386
		2011		4			(b	)		242			8			(b	)		482
Ameren Illinois power supply	Purchased Power	2012	$	(a	)	$	72		$	(a	)	$	(a	)	$	160		$	(a	)
agreements with Marketing Company		2011		(a	)		48			(a	)		(a	)		94			(a	)
EEI power supply agreement with	Purchased Power	2012		(a	)		(a	)		(b	)		(a	)		(a	)		(b	)
Marketing Company		2011		(a	)		(a	)		12			(a	)		(a	)		12
Total Purchased Power		2012	$	(a	)	$	72		$	(b	)	$	(a	)	$	160		$	(b	)
		2011		(a	)		48			12			(a	)		94			12
Ameren Services support services	Other Operations	2012	$	27		$	22		$	5		$	55		$	45		$	10
agreement	and Maintenance	2011		28			21			4			59			45			10
Insurance premiums^(c)	Other Operations	2012		(b	)		(a	)		(a	)		(b	)		(a	)		(a	)
	and Maintenance	2011		(b	)		(a	)		(a	)		(b	)		(a	)		(a	)
Total Other Operations and		2012	$	27		$	22		$	5		$	55		$	45		$	10
Maintenance Expenses		2011		28			21			4			59			45			10
Money pool borrowings (advances)	Interest Charges	2012	$	-		$	(b	)	$	(b	)	$	-		$	(b	)	$	(b	)
		2011		-			-			(b	)		-			-			(b	)

(a)	Not applicable.

(b)	Amount less than $1 million.

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

Related Party Transactions

NOTE 8 - 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. For a discussion of our material related party agreements, see Note 14 - Related Party Transactions under Part II, Item 8, of the Form 10-K.

Put Option Agreement and Guaranty

On March 28, 2012, Genco entered into a put option agreement with AERG. The put option gives Genco the option to sell to AERG all, but not less than all, of the Grand Tower, the Gibson City, and the Elgin energy centers. If Genco exercises the put option, the purchase price for all three energy centers will be the greater of $100 million or the fair market value of the energy centers, as determined by three third-party appraisers in accordance with the terms of the agreement. Upon exercise of the put option, the $100 million minimum purchase price would be payable to Genco within one business day. Genco may exercise the put option at any time from March 28, 2012 through March 28, 2014. The put option may be extended indefinitely for additional one-year periods by agreement of AERG and Genco. If Genco exercises the put option, the closing of the sale of all three energy centers will be subject to the receipt of all necessary regulatory approvals. In exchange for entering into the put option agreement, Genco paid AERG a put option premium of $2.5 million. The put option premium paid by Genco was recorded as an “Other asset” on Genco’s consolidated balance sheet and is being amortized over two years. The amortization expense is eliminated in the consolidation of Ameren’s financial statements.

The put option agreement requires AERG to secure and maintain an Ameren guaranty of payment of contingent obligations under the agreement. Ameren and AERG entered into such a guaranty agreement on March 28, 2012. The guaranty shall remain in effect until either AERG or Ameren satisfies all of the payment obligations under the put option agreement, or the put option agreement is terminated and no further payments are owed by AERG to Genco. As of June 30, 2012, Genco had not exercised the put option.

Intercompany Transfers

In June 2012, Genco transferred various assets from the Hutsonville and Meredosia energy centers to AERG. Both of the energy centers were retired in 2011. Genco recorded an intercompany receivable in the amount of less than $1 million at June 30, 2012. The transfer of the assets was accounted for as a transaction between entities under common control; therefore, Genco did not recognize a gain on the transfer, and upon consolidation Ameren recorded the assets at carrying value.

Electric Power Supply Agreements

During the second quarter of 2012, Ameren Illinois used a RFP process, administered by the IPA, to contract capacity for the period from June 1, 2012, through May 31, 2015. Both Marketing Company and Ameren Missouri were among the winning suppliers in the capacity RFP process. In April 2012, Marketing Company contracted to supply a portion of Ameren Illinois’ capacity requirements for less than $1 million and $4 million for the 12 months ending May 31, 2013 and 2015, respectively. In April 2012, Ameren Missouri contracted to supply a portion of Ameren Illinois’ capacity requirements for $1 million and $3 million for the 12 months ending May 31, 2014 and 2015, respectively.

Collateral Postings

Under the terms of the 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 Marketing Company, as a winning supplier of capacity and financial energy swaps, may be required to post collateral. As of December 31, 2011 and June 30, 2012, there were no collateral postings required of Ameren Missouri or Marketing Company related to the Illinois power procurement agreements.

Marketing Company Sale of Trade Receivables to Ameren Illinois

In accordance with the Illinois Public Utilities Act, Ameren Illinois is required to purchase alternative retail electric suppliers’ receivables relating to Ameren Illinois’ delivery service customers who elected to receive power supply from the alternative retail electric supplier. Beginning in June 2012, Marketing Company sold and Ameren Illinois purchased trade receivables relating to the power supply of residential customers using Marketing Company as their alternative retail electric supplier. Marketing Company has no continuing involvement with or control over the trade receivables after the sale is completed to Ameren Illinois, and neither company has any restrictions on the assets associated with these purchase and sale transactions. As of June 30, 2012, Ameren Illinois’ payable to Marketing Company for the purchase of trade receivables totaled less than $1 million. For the six months ended June 30, 2012 Ameren Illinois purchased less than $1 million of trade receivables from Marketing Company. Marketing Company’s receivable from Ameren Illinois as well as Ameren Illinois’ payable to Marketing Company are eliminated in the consolidated Ameren Corporation’s financial statements.

Money Pools

See Note 3 - Short-term Debt and Liquidity for a discussion of affiliate borrowing arrangements.

The following table presents the impact on Ameren Missouri, Ameren Illinois and Genco of related party transactions for the three and six months ended June 30, 2012, and 2011. It is based primarily on the agreements discussed above and in Note 14 - Related Party Transactions under Part II, Item 8, of the Form 10-K, and the money pool arrangements discussed in Note 3 - Short-term Debt and Liquidity of this report.


			Three Months									Six Months
Agreement	Income Statement Line Item		Ameren Missouri			Ameren Illinois			Genco			Ameren Missouri			Ameren Illinois			Genco
Genco and EEI power supply	Operating Revenues	2012	$	(a	)	$	(a	)	$	193		$	(a	)	$	(a	)	$	386
agreements with Marketing Company		2011		(a	)		(a	)		242			(a	)		(a	)		482
Ameren Missouri and Ameren Illinois	Operating Revenues	2012		4			(b	)		(a	)		8			(b	)		(a	)
rent and facility services		2011		4			(b	)		(a	)		8			(b	)		(a	)
Ameren Missouri and Genco gas	Operating Revenues	2012		(b	)		(a	)		(b	)		(b	)		(a	)		(b	)
transportation agreement		2011		(b	)		(a	)		(b	)		(b	)		(a	)		(b	)
Total Operating Revenues		2012	$	4		$	(b	)	$	193		$	8		$	(b	)	$	386
		2011		4			(b	)		242			8			(b	)		482
Ameren Illinois power supply	Purchased Power	2012	$	(a	)	$	72		$	(a	)	$	(a	)	$	160		$	(a	)
agreements with Marketing Company		2011		(a	)		48			(a	)		(a	)		94			(a	)
EEI power supply agreement with	Purchased Power	2012		(a	)		(a	)		(b	)		(a	)		(a	)		(b	)
Marketing Company		2011		(a	)		(a	)		12			(a	)		(a	)		12
Total Purchased Power		2012	$	(a	)	$	72		$	(b	)	$	(a	)	$	160		$	(b	)
		2011		(a	)		48			12			(a	)		94			12
Ameren Services support services	Other Operations	2012	$	27		$	22		$	5		$	55		$	45		$	10
agreement	and Maintenance	2011		28			21			4			59			45			10
Insurance premiums^(c)	Other Operations	2012		(b	)		(a	)		(a	)		(b	)		(a	)		(a	)
	and Maintenance	2011		(b	)		(a	)		(a	)		(b	)		(a	)		(a	)
Total Other Operations and		2012	$	27		$	22		$	5		$	55		$	45		$	10
Maintenance Expenses		2011		28			21			4			59			45			10
Money pool borrowings (advances)	Interest Charges	2012	$	-		$	(b	)	$	(b	)	$	-		$	(b	)	$	(b	)
		2011		-			-			(b	)		-			-			(b	)

(a)	Not applicable.

(b)	Amount less than $1 million.

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