8-K

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C.  20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the

Securities Exchange Act of 1934

Date of report (Date of earliest event reported):

July 24, 2009

Commission File Number	Exact Name of Registrant as Specified in Charter; State of Incorporation; Address and Telephone Number	IRS Employer Identification Number
1-14756	Ameren Corporation (Missouri Corporation) 1901 Chouteau Avenue St. Louis, Missouri 63103 (314) 621-3222	43-1723446
1-2967	Union Electric Company (Missouri Corporation) 1901 Chouteau Avenue St. Louis, MO 63103 (314) 621-3222	43-0559760

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrants under any of the following provisions:

[  ] Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

[  ] Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

[  ] Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

[  ] Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

ITEM 8.01  Other Events.

On July 24, 2009, Union Electric Company, doing business as AmerenUE (“UE”), will be filing a request with the Missouri Public Service Commission (“MoPSC”) seeking approval to increase its annual revenues for electric service by approximately $402 million.  Included in this increase is approximately $227 million of anticipated increases in normalized net fuel costs above the net fuel costs included in base rates previously authorized by the MoPSC in its January 2009 electric rate order which, absent initiation of this general rate proceeding, would have been reflected in rate adjustments implemented under UE’s existing fuel and purchased power cost recovery mechanism (“FAC”). The balance of the increase request is based primarily on investments made to continue system-wide reliability improvements for customers, increases in costs essential to generating and delivering electricity and higher financing costs. The electric rate increase request is based on an 11.5 percent return on equity, a capital structure composed of 47.4 percent equity, an aggregate rate base for UE of $6.0 billion, and a test year ended March 31, 2009, with certain pro-forma adjustments through the anticipated true-up date of February 28, 2010.

UE’s filing includes a request for interim rate relief which, if approved, would place into effect approximately $37.3 million of the requested increase on October 1, 2009, subject to refund with interest based on the final outcome of the rate proceeding. The amount of this interim increase request reflects the increased revenue requirement associated with rate base additions made by UE between October 2008 and May 2009.

As a part of its filing, UE also requested the MoPSC to approve the implementation of an environmental cost recovery mechanism and the continued use of the FAC that the MoPSC previously authorized in its January 2009 electric rate order.  The environmental cost recovery mechanism, if approved, would allow UE to periodically adjust electric rates outside of general rate proceedings to reflect changes in its prudently incurred costs to comply with federal, state or local environmental laws, regulations or rules above or below the amount set in base rates.  Rate adjustments pursuant to this cost recovery mechanism would not be permitted to exceed an annual amount equal to 2.5 percent of UE’s gross jurisdictional electric revenues and would be subject to prudency reviews of the MoPSC.  The FAC allows UE to periodically adjust electric rates outside of general rate proceedings to reflect 95 percent of changes in prudently incurred fuel (coal, coal transportation, natural gas for generation and nuclear) and purchased power costs, net of off-system revenues, including Midwest Independent Transmission System Operator, Inc. costs and revenues, above or below the amount set in base rates.

In addition, UE’s filing with the MoPSC seeks approval to revise the tariff under which it serves Noranda Aluminum, Inc. (“Noranda”), UE’s largest electric customer, to prospectively address the significant lost revenues UE can incur due to Noranda’s operational issues at its smelter plant in southeastern Missouri, like the revenue losses resulting from the January 2009 storm-related power outage. The tariff change that UE is proposing would permit it to collect from Noranda the revenue authorized by the MoPSC in this rate case regardless of the level at which the Noranda plant is operating at prospectively. If the plant is operating below the levels assumed in rates, Noranda would receive a credit reflecting any revenues received by UE from energy sales resulting from the decrease in actual energy sales to Noranda. The result would be that UE is able to recover its costs without impacting other customers regardless of Noranda’s actual energy use.

The MoPSC proceeding relating to the proposed electric service rate changes will take place over a period of up to 11 months and a decision by the MoPSC in such proceeding is required by the end of June 2010.  UE cannot predict the level of any electric service rate change the MoPSC may approve, when any rate change (interim or final) may go into effect, whether the environmental cost recovery mechanism and continuation of the FAC will be approved, or whether any rate increase that may eventually be approved will be sufficient for UE to recover its costs and earn a reasonable return on its investments when the increase goes into effect.  Attached as Exhibit 99.1 and incorporated herein by reference is the UE press release regarding its filing with the MoPSC.

ITEM 9.01  Financial Statements and Exhibits.

(d)  Exhibits

Exhibit Number:                    Title:

99.1 Press release regarding electric service rate increase filing, issued on July 24, 2009 by UE.

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This combined Form 8-K is being filed separately by Ameren and UE.  Information contained herein relating to any individual registrant has been filed by such registrant on its own behalf.  No registrant makes any representation as to information relating to any other registrant.

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SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, each registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.  The signature for each undersigned company shall be deemed to relate only to matters having reference to such company or its subsidiaries.

AMEREN CORPORATION

(Registrant)

/s/ Martin J. Lyons                                                                                                

Martin J. Lyons

Senior Vice President and Chief Financial Officer

UNION ELECTRIC COMPANY

(Registrant)

/s/ Martin J. Lyons                                                                                         

Martin J. Lyons

Senior Vice President and Chief Financial Officer

Date:  July 24, 2009

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Exhibit Index

Exhibit Number:                    Title:

99.1 Press release regarding electric service rate increase filing, issued on July 24, 2009 by UE.

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EX-99.1

Exhibit 99.1

AmerenUE Requests Increase In Electric Rates To Continue

Providing Reliable Power To Customers

St. Louis, MO, July 24, 2009 – AmerenUE, the Missouri utility company of Ameren Corporation (NYSE: AEE), will be filing today a request for an electric rate increase with the Missouri Public Service Commission (MoPSC). If approved in its entirety, the request would mean an increase of less than 50 cents per day for the average household (based on a residential customer average of 1,100 kilowatt hours used each month). Each household’s increase would vary according to the amount of electricity used.

The $402 million request represents an 18 percent increase in rates. Nearly half of the request is primarily driven by investments made to continue system-wide reliability improvements for customers, increases in costs essential to generating and delivering electricity and higher financing costs. The remainder of the request (slightly more than half) is to cover higher fuel costs and lower revenues from sales outside UE’s system. The MoPSC will conduct a thorough review of the company’s request and offer opportunities for public comment. A final decision is expected by June 2010.

 “Our customers have told us that reliability is their highest priority,” said Warner Baxter, AmerenUE president and chief executive officer. “We have listened and responded by making significant reliability improvements, largely through our Power On program, and those investments are working.

“While our current rates are among the lowest in the nation, we know that rising costs to meet customer expectations for reliability, as well as federal and state requirements for renewable energy and cleaner air, are going to continue to drive up energy costs,” said Baxter. “Our current rates simply do not reflect the investments we have made and the costs we are incurring to deliver safe, reliable power to our customers.”

 Today UE’s electric rates are approximately 40 percent below the national average and more than 20 percentbelow the approved electric rates of other investor-owned utilities in the state of Missouri.

“We know these rate increases create hardships for some of our customers, especially during this difficult economic period,” Baxter said. “As a result, we are taking proactive steps to reduce costs, launching energy efficiency initiatives and providing several energy assistance programs to help customers with their energy costs now and in the future.

“Our customers expect us to tighten our belts during this challenging economic period, just as they are. As a result, we have already reduced certain planned expenditures in 2009. In addition, we are considering several cost reduction measures, including executive compensation. Over the next two years, we are currently targeting to reduce certain expenditures in excess of $150 million below 2008 levels. However, we will not tighten our belts at the expense of providing safe, reliable service to our customers,” added Baxter.

To give customers more control over their energy usage and costs, UE recently launched several residential energy efficiency programs, which include purchase incentives for energy efficient lighting and appliances, customer education and partnerships with retailers and contractors, according to Baxter. More information about these programs is available at UEfficiency.com. UE’s business efficiency programs launched earlier this year.

“The goal of the residential and business efficiency programs is to reduce usage by 540 megawatts, the output of a medium-sized coal-fired power plant, by 2025,” he said. “Our customers will save on their bills, help the environment and defer the need to build an expensive new power plant,” said Baxter.

Additional tools for all customers include UE’s Energy Savings Toolkit and Personal Energy Report. Budget Billing also helps customers balance out bills throughout the year, eliminating surprises, particularly in the hot summer months.

For those customers who are least able to afford higher energy costs, Baxter outlined several assistance programs, including Clean Slate, Dollar More, Low-income Home Weatherization programs and Air Conditioner give-aways.

“These programs are targeted to help customers with the greatest needs during this difficult economic period,” said Baxter. “We are pleased to sponsor these initiatives because thousands of families benefit from these programs.”

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“We will continue to make the best use of every UE asset to provide our customers with safe, reliable and clean energy,” said Baxter. “This increase is needed to fulfill our commitment to our customers to continue to listen, respond and deliver by providing reliable power, dedicated customer service and vision for a sustainable future.”

Other features of this request include:

·   An Environmental Cost Recovery Mechanism, or ECRM, to speed the recovery time of federal or state required environmental investments.

·   An interim rate increase, of approximately 1.7 percent or $37 million effective Oct. 1, for investments already serving customers. This would reduce the length of time between when UE spends money and when those funds are recovered. This interim increase is subject to refund after a review of our entire case by the MoPSC.

·   Continuing the fuel cost recovery mechanism previously approved by the MoPSC. (Under the existing fuel cost recovery mechanism, slightly more than half of this requested increase would have been reflected in adjustments to customers rates had today’s filing not taken place.)

Additional information about this electric rate case will be available on the Ameren Web site (www.ameren.com/ueprice).

AmerenUE serves approximately 1.2 million electric and 127,000 natural gas customers. Ameren Corporation, through its utility companies, serves approximately 2.4 million electric and nearly one million natural gas customers over 64,500 square miles in Missouri and Illinois.

Forward-looking Statements

Statements in this release not based on historical facts are considered “forward-looking” and, accordingly, involve risks and uncertainties that could cause actual results to differ materially from those discussed. Although such forward-looking statements have been made in good faith and are based on reasonable assumptions, there is no assurance that the expected results will be achieved. These statements include (without limitation) statements as to future expectations, beliefs, plans, strategies, objectives, events, conditions, and financial performance. In connection with the “safe harbor” provisions of the Private Securities Litigation Reform Act of 1995, we are providing this cautionary statement to identify important factors that could cause actual results to differ materially from those anticipated. The following factors, in addition to those discussed elsewhere in this release and in our filings with the Securities and Exchange Commission, could cause actual results to differ materially from management expectations suggested in such forward-looking statements:

• regulatory or legislative actions, including changes in regulatory policies and ratemaking determinations and future rate proceedings or future legislative actions that seek to limit or reverse rate increases;

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• changes in laws and other governmental actions, including monetary and fiscal policies;

• changes in laws or regulations that adversely affect the ability of electric distribution companies and other purchasers of wholesale electricity to pay their suppliers, including UE;

• the effects of increased competition in the future due to, among other things, deregulation of certain aspects of our business at both the state and federal levels, and the implementation of deregulation;

• increasing capital expenditure and operating expense requirements and our ability to recover these costs in a timely fashion in light of regulatory lag;

• the effects of participation in the Midwest Independent Transmission System Operator, Inc.;

• the cost and availability of fuel such as coal, natural gas, and enriched uranium used to produce electricity; the cost and availability of purchased power and natural gas for distribution; and the level and volatility of future market prices for such commodities, including the ability to recover the costs for such commodities;

• the effectiveness of our risk management strategies and the use of financial and derivative instruments;

• prices for power in the Midwest, including forward prices;

• business and economic conditions, including their impact on interest rates, bad debt expense, and demand for our products;

• disruptions of the capital markets or other events that make UE’s access to necessary capital, including short term credit and liquidity, impossible, more difficult or more costly;

• our assessment of our liquidity;

• actions of credit rating agencies and the effects of such actions;

• weather conditions and other natural phenomena, including impacts to our customers;

• the impact of system outages caused by severe weather conditions or other events;

• generation plant construction, installation and performance, including costs associated with UE’s Taum Sauk pumped-storage hydroelectric plant incident and the plant’s future operation;

• impairments of long-lived assets or goodwill;

• recoverability through insurance of costs associated with UE’s Taum Sauk pumped-storage hydroelectric plant incident;

• operation of UE’s nuclear power facility, including planned and unplanned outages, and decommissioning costs;

• the effects of strategic initiatives, including acquisitions and divestitures;

• the impact of current environmental regulations on utilities and power generating companies and the expectation that more stringent requirements, including those related to greenhouse gases, will be enacted over time, which could have a negative financial effect;

• the inability of our counterparties and affiliates to meet their obligations with respect to contracts, credit facilities and financial instruments;

• the cost and availability of transmission capacity for the energy generated by UE’s facilities or required to satisfy energy sales made by UE;

• legal and administrative proceedings; and

• acts of sabotage, war, terrorism or intentionally disruptive acts.

Given these uncertainties, undue reliance should not be placed on these forward-looking statements. Except to the extent required by the federal securities laws, we undertake no obligation to update or revise publicly any forward-looking statements to reflect new information or future events.

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