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Ameren Renewable Energy Fact Sheet

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					                          RENEWABLE ENERGY:
                          Encouraging Resource Development

St. Louis-based           Ameren has a strong interest in pursuing a diverse portfolio of generation
Ameren Corporation        options that include developing renewable power. The company has a long
(NYSE: AEE) is among      history of incorporating renewable resources into our generation portfolio.
the nation’s largest      This fact sheet includes information on Ameren’s renewable initiatives:
investor-owned electric
and gas utilities, with
approx. $24 billion
in assets.                Adding Wind Power
                          In response to the need for expanding renewable resources in our region, Ameren’s Missouri
The largest electric      utility company –– AmerenUE –– in 2007 began to plan for the addition of at least 100
                          megawatts of wind power to its generating portfolio. In 2009, AmerenUE announced a first-
utility in Missouri
                          ever venture for the company –– an agreement to purchase 102 megawatts (MW) of wind
and the second
                          power from phase II of Horizon Wind Energy’s Pioneer Prairie Wind Farm in Iowa — enough to
largest in Illinois,      power 26,000 households. For a look at a typical wind farm, visit the Web site of the American
Ameren companies          Wind Energy Association (AWEA) at www.awea.org. The power AmerenUE is purchasing will
provide energy            tie into the Midwest Independent Transmission System Operator (MISO) transmission grid, of
services to 2.4 million   which the company is a member.
electric and nearly           In Missouri, recent legislation will encourage further development of renewable energy
                          resources and generation. On Nov. 4, 2008, voters approved Proposition C which requires the
one million natural
                          investor-owned utilities in Missouri to generate or purchase a percentage of their energy from
gas customers
                          renewable energy resources. Starting in 2011, two percent of a utility’s total retail electric
throughout its entire     sales are to come from renewable resources, increasing to 5 percent by 2014, 10 percent by
64,000 square mile        2018 and 15 percent by 2021. These increases restrict any rate increase to consumers to not
territory.                exceed 1 percent.
                              In Illinois, as part of the 2007 electric settlement, power procurement is being managed
                          by the Illinois Power Authority (IPA). The IPA procures capacity, energy swaps and renewable
                          energy credits on behalf of the Ameren Illinois Utilities. As part of the 2008 request for
                          proposal (RFP), there was also a renewable energy credits RFP. It resulted in the Ameren
                          Illinois Utilities contracting to purchase 415,000 credits at an average price of $17 per credit.
                          Effective in 2008, Illinois established a renewable portfolio standard –– requiring a certain
                          percentage of the generation purchased in the state to come from renewable resources with
                          the goal of having 25 percent of each generation portfolio come from renewables by the
                          year 2025; 75 percent of those renewables must come from wind energy. Renewables can be


   fact
                          purchased so long as the impact on energy costs to consumers does not exceed an increase of
                          .5 percent per year annually between 2008 and 2011.


  sheet
                                                                          Leading the Way to a Secure Energy Future
Educating the Next Generation About Renewables
The company and The National Theatre for Children (NTC) have been bringing a live theatrical show to hundreds of schools
across Missouri. Offered to educators free of charge on a first-come, first-served basis, the 25-minute interactive program
delivers important messages of energy conservation and renewable energy as it entertains children in grades K-6. Educators
are encouraged to call NTC at 800-858-3999, ext. 1, to request a performance.

Turning Methane into Megawatts
AmerenUE announced in September 2009 an agreement with Fred Weber, Inc. that includes plans to install combustion
turbines capable of generating about 15 MWs of electricity by burning methane gas at Fred Weber’s Maryland Heights, Mo.,
solid waste landfill. Expected to be operational in 2011, the “Methane to Megawatts” project will be the largest landfill gas-
electric plant in Missouri and among the largest landfill generation plants in the country in terms of generating capacity,
producing enough electricity to meet the demands of about 10,000 homes. Under the terms of the agreement, the company
will purchase the methane from Fred Weber. Methane and other gases are the natural byproducts of the decomposition of
waste in the landfill. The gas is collected through 120 landfill wells, which are plumbed and connected with two miles of high-
density plastic pipe. The methane then will be delivered to the turbines through a blower plant that delivers 6,000 cubic feet
of landfill gas per minute, 24 hours a day. The company is conducting engineering studies to determine the best location on
Fred Weber’s property to place the turbines. Construction of the turbines is expected to begin in 2010, and the turbines are
expected to begin generating power sometime in 2011.

Offering Options to Customers
Responding to customer interest in promoting renewable energy use, AmerenUE launched Pure Power™ in 2007 –– a
voluntary renewable energy credit (REC) program for Missouri residential and business customers. Pure Power allows
residential customers to voluntarily pay an additional 1.5 cents per kilowatthour (kWh) to purchase RECs to encourage
development of renewable resources. Residential customers, as well as small, medium and large business customers, can
also participate by purchasing 1,000 kWh “blocks” of Pure Power for $15 per block. The United States Department of Energy
(DOE) named the company’s Pure Power™ program the “most successful” New Green Power Program of the year in the fall
of 2008. DOE along with the U.S. Environmental Protection Agency (EPA) and the Center for Resource Solutions (CRS) cited
Pure Power as one of the largest green-pricing programs in the Midwest with its more than 4,000 customers.
   In the summer of 2009, the CRS again recognized the company for having the “Best Marketing Campaign by a Green Power
Supplier.” The award was presented as part of the 2009 Green Power Leadership Awards ceremony, organized by the DOE, the
U.S. EPA and the CRS. The award recognizes Pure Power’s “P.U.R.E.* (People Using Renewable Energy) Genius” campaign,
which featured “real people” and their personal reasons for supporting Pure Power.
   Beginning Jan. 1, 2010, in Missouri, the company is offering a rebate of $2 per watt up to 25 kilowatts or a maximum
of $50,000 for qualified new installations (post 1/1/2010) of solar electric systems on residential and commercial
properties. Go to www.ameren.com after Jan. 1, 2010, for more information.




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Researching Renewables
Over the past two decades, the company has researched wind and solar resources, joining with other utilities and academic
experts to determine the technical and economic viability of potential wind and solar sites in Missouri and Illinois. More
recently, the company has funded internal studies on the feasibility of using a blend of coal and biomass fuels to produce
electricity (biomass energy comes from vegetation, animal wastes and landfill gas). Studies have also been undertaken
related to anaerobic digester systems. Today, through the joint state and federal Tall Towers Program, the company is working
with other Missouri and Illinois electric utilities to determine this region’s potential for the next generation wind turbines.

Increasing Capacity
AmerenUE has increased hydroelectric generation capacity through upgrades at our Osage Plant near the Lake of the Ozarks
in Missouri (online in 1931) and Keokuk Plant in Iowa (online in 1913). Plans are to increase capacity even more at those
plants in the future.

Incorporating Renewables in Future Generation Plans
The company has a robust plan for incorporating renewables into its overall power generation mix — with continued and
detailed assessments of prospective regional renewable resources, like hydroelectric, landfill gas, anaerobic digesters
plus generation from biomass and wind. Once the regional resources with the most technical and economic potential are
identified, then the company will implement a plan for development. The company will continue to utilize a mix of various
generation resources to ensure least-cost, reliable energy to our customers.

Dealing with Challenges Related to Renewables
Across the U.S., development of renewable energy faces regulatory hurdles and resource issues because of the need for large
amounts of land and reliance on intermittent natural resources — like wind — that are not reliable for electrical generation
purposes. A major issue for renewables is the overall lack of transmission infrastructure to bring wind energy from high wind
areas (usually where few people live) to places in and around Missouri and Illinois where wind is not as prevalent and to
cities where electricity demand is greatest. The company filed an Integrated Resource Plan on Feb. 5, 2008, offering more
detailed analysis of the impact of these risk factors.



For more information, visit www.ameren.com/renewables.




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