RELATED PARTY TRANSACTIONS

Ameren and its subsidiaries 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, asset transactions, guarantees, 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.

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 and Marketing Company, as winning suppliers in the RFP process, may be required to post collateral. As of December 31, 2012, and September 30, 2013, 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, beginning in June 2012, 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. Marketing Company sells and Ameren Illinois purchases 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 September 30, 2013, Ameren Illinois’ payable to Marketing Company for the purchase of trade receivables totaled $17 million. During the nine months ended September 30, 2013, Ameren Illinois purchased $115 million of trade receivables from Marketing Company at a discount of $2 million. Marketing Company’s receivable from Ameren Illinois as well as Ameren Illinois’ payable to Marketing Company are eliminated in Ameren’s consolidated financial statements. After the New AER divestiture is complete, these transactions will no longer be eliminated in Ameren’s consolidated financial statements.

Parent Company Guarantees

In the ordinary course of business, Ameren (parent) enters into various agreements providing financial assurance to third parties on behalf of its subsidiaries. Such agreements include, for example, guarantees and letters of credit. These agreements are entered into primarily to support or enhance the creditworthiness otherwise attributed to a subsidiary on a stand-alone basis, thereby facilitating the extension of sufficient credit and reducing the amount of cash collateral required to be posted. These agreements guarantee performance by Ameren's subsidiaries of obligations already reflected on Ameren's consolidated balance sheet.

Upon the divestiture of New AER, the transaction agreement with IPH requires Ameren (parent) to maintain its financial obligations with respect to all credit support provided to New AER as of the closing date of such divestiture and provide such additional credit support as required by contracts entered into prior to the closing date, in each case for up to 24 months after the closing. IPH shall indemnify Ameren for any payments Ameren makes pursuant to these credit support obligations if the counterparty does not return the posted collateral to Ameren. IPH's indemnification obligation will be secured by certain AERG and Genco assets. In addition, Dynegy has provided a limited guarantee of $25 million to Ameren (parent) pursuant to which Dynegy will, among other things, guarantee IPH's indemnification obligations for a period of up to 24 months after the closing. See Note 2 - Divestiture Transactions and Discontinued Operations.

At September 30, 2013, Ameren had a total of $192 million in guarantees outstanding, excluding a guarantee for Medina Valley related to the amended put option agreement. This guarantee expired in October 2013 with the closing of Genco’s sale of the Elgin, Gibson City, and Grand Tower gas-fired energy centers to Medina Valley. See Note 2 - Divestiture Transactions and Discontinued Operations for further discussion of the put option agreement. See below for further discussion of the outstanding guarantees:

•

$154 million related to Ameren's Merchant Generation segment, primarily for Marketing Company as support for physically and financially settled power transactions with its counterparties. As of September 30, 2013, this amount does not represent an incremental consolidated Ameren obligation; rather, it represents Ameren parental guarantees of subsidiary obligations to third parties, which may include affiliates, in order to allow the subsidiaries the flexibility needed to conduct business with counterparties without having to post other forms of collateral. Ameren's estimated exposure for obligations under transactions covered by these guarantees was $25 million at September 30, 2013, which represents the total amount Ameren (parent) could be required to fund based on September 30, 2013 market prices.


•	$25 million provided to a clearing broker acting as futures commission merchant for the clearing of certain power, natural gas, and fuels commodity transactions for AER.


•	$13 million related to requirements for asset transactions, leasing, Medina Valley transactions through MISO and other agreements. At September 30, 2013, Ameren estimated it had no exposure to any of these guarantees.

Additionally, at September 30, 2013, Ameren had issued letters of credit totaling $14 million as credit support to certain subsidiaries.

Miscellaneous Support Services

Ameren Missouri and Ameren Illinois provide storm-related and miscellaneous support services to each other on an as- needed basis. Ameren Illinois provided to Ameren Missouri $2 million in storm-related support services during the nine months ended September 30, 2013. Ameren Missouri provided to Ameren Illinois $1 million in miscellaneous support services during the three and nine months ended September 30, 2013. Ameren Missouri provided to Ameren Illinois $1 million in miscellaneous support services during the nine months ended September 30, 2012. These amounts are reflected in “Operating Revenues - Other” on the statement of income and comprehensive income.

Money Pools

See Note 4 - Short-term Debt and Liquidity for a discussion of affiliate borrowing arrangements.

The following table presents the impact on Ameren Missouri and Ameren Illinois of related party transactions for the three and nine months ended September 30, 2013, and 2012. 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 4 - Short-term Debt and Liquidity of this report.



				Three Months				Nine Months
Agreement	Income Statement Line Item			Ameren Missouri		Ameren Illinois		Ameren Missouri		Ameren Illinois
Ameren Missouri power supply	Operating Revenues	2013	$	(b)	$	(a)	$	1	$	(a)
agreements with Ameren Illinois		2012		(b)		(a)		(b)		(a)
Ameren Missouri and Ameren Illinois	Operating Revenues	2013		4		(b)		15		1
rent and facility services		2012		5		(b)		14		1
Ameren Missouri and Genco gas	Operating Revenues	2013		(b)		(a)		1		(a)
transportation agreement		2012		(b)		(a)		1		(a)
Transmission services agreement	Operating Revenues	2013		(a)		11		(a)		24
with Marketing Company		2012		(a)		5		(a)		11
Total Operating Revenues		2013	$	4	$	11	$	17	$	25
		2012		5		5		15		12
Ameren Illinois power supply	Purchased Power	2013	$	(a)	$	46	$	(a)	$	94
agreements with Marketing Company		2012		(a)		83		(a)		243
Ameren Illinois power supply	Purchased Power	2013		(a)		(b)		(a)		1
agreements with Ameren Missouri		2012		(a)		(b)		(a)		(b)
Total Purchased Power		2013	$	(a)	$	46	$	(a)	$	95
		2012		(a)		83		(a)		243
Ameren Services support services	Other Operations and Maintenance	2013	$	25	$	22	$	85	$	70
agreement		2012		26		22		81		67
Insurance premiums^(c)	Other Operations and Maintenance	2013		(b)		(a)		(b)		(a)
		2012		(b)		(a)		(b)		(a)
Total Other Operations and		2013	$	25	$	22	$	85	$	70
Maintenance Expenses		2012		26		22		81		67
Money pool borrowings (advances)	Interest Charges	2013	$	(b)	$	(b)	$	$1	$	(b)
		2012		(b)		(b)		(b)		(b)


(a)	Not applicable.


(b)	Amount less than $1 million.


(c)	Represents insurance premiums paid to Missouri Energy Risk Assurance Company, an affiliate, for replacement power.