Case Study

                                           AmerenUE's Labadie Power Plant has four units that burn about 11 million
                                           tons of PRB coal a year and have a collective capacity of 2,400 MW. The plant,
                                           located 35 miles west of St. Louis, also generates about 200,000 tons ofbottom
                                           ash a year. Courtesy: AmerenUE
                                     PRB Tech Notes
AmerenUE teams with Charah and Home Depot to market ash for concrete mix
Burning Powder River Basin (PRB) coal
can be a curse or a blessing, depending
on your attention to the details of plant
design and operations. One disadvantage
of PRB coal combustion is the abundance
of bottom ash and fly ash generated as
a by-product. Handling  and  properly
disposing of the ash  can be  challenging
and  costly.  Both kinds  of ash  have
commercial  value, however.  Last year,
the  2,400-MW Labadie Power Plant in
Missouri burned about 11 million tons of
PRB coal, generating about 200,000 tons
of bottom ash, so they understand both
the challenges and the profit opportunity.

In September, the largest of AmerenUE's
coal-fired stations, Labadie,  celebrated
the  first  anniversary  of the  opening
of a  concrete  packaging  facility  that
is  now  recycling  more than  60,000
tons of  fly ash  and bottom ash  into
2 million bags of high-quality concrete
mix every year.

Partners in Ash

The unique  project is the product of a
partnership  among  AmerenUE (www.
ameren.com);   the   ash  management
specialist Charah,  Inc.   (www.charah.
com); The Quikrete Companies; and The
Home Depot (Figure 3). The concrete mix
is prepared at the facility and packaged in
recyclable, two-handled plastic bags from
Charah. It is then distributed to  Home
Depot stores in the St. Louis metropolitan
area for sale to customers  under the
Quikrete brand name.

The 60,000 tons ofbottom ash being reused
as a concrete  aggregate  represents less
than half of Labadie's annual production.
Ultimately, AmerenUE officials hope to
recycle all of it.

In addition  to  the  ash  being used to
make concrete mix, more than a year's
worth of Labadie's bottom ash was used
as structural fill for the  state-of-the-art,
                                                               The partnership of AmerenUE', Charah, Inc; The Quikrete Companies; and The
                                                               Home Deport just celebrated its first year of operation.
                                                               Courtesy: Charah, Inc.
                                                               The facility is designed to recycle more than 60,000 tons of fly ash and bottom
                                                               ash into 2 million bags of high-quality concrete mix.
                                                               Courtesy: Charah, Inc.
                                                                                     Page 1 of 2

                                                                                                        PRB Tech Notes
Case Study

                                                              The concrete mix product is available in Home Depot stores in the St. Louis
                                                              metropolitan area under the Quikrete brand name.
                                                              Courtesy: Charah, Inc.
35,000-ft2  packaging  facility.   Charah
launched  its  first  bottom  ash/plastic
packaging plant in Virginia, but the one in
Missouri is the first in the U.S. on power
plant property.  Charah, Inc. annually
processes 250,000 tons of bottom ash
and markets it to the concrete block and
concrete mix industries in North Carolina,
South  Carolina,  Tennessee,  Kentucky,
and Virginia.

Because ash is not classified as ahazardous
waste   by  the  U.S.   Environmental
Protection Agency (EPA),  Ameren and
other coal-burning  utilities have long
reused it for various products and applications—such as blasting grit, roofing shingles, cement and concrete
manufacturing, structural fill, and snow and ice control. "This is the best example yet of Ameren's ongoing
initiative to find beneficial uses for the materials that result from burning coal to generate electricity," said
R. Alan Kelley, Ameren's senior vice president for generation.

Bottom Ash is Tops

This July, the Missouri Waste  Control Coalition presented AmerenUE with an Outstanding Achievement
Award for the AmerenUE/Charah concrete packaging facility at Labadie Power Plant. The coalition is
a  400-member,  not-for-profit entity  for citizens, businesses, and  organizations concerned about the
environmental impact of waste management and disposal.

Charah and Ameren are charter members of the U.S. EPA's Coal Combustion Products Partnership (C2P2),
which encourages beneficial use  of coal by-products. In April 2005, Charah earned a  prestigious C2P2
Innovation Award for its efforts to increase the amount of coal combustion products put to good use instead
of being landfilled. Charah's award was for its development of concrete mix and packaging.

"Charah's packaging is the most exciting, powerful innovation in the bagged concrete industry in 70 years,"
said Giles Bowman, merchandising vice president for building materials at Home Depot. "The sealed plastic
bag is sturdy, and the two handles make it very easy for our customers to lift and carry. At the same time,
this packaging is less likely to  break than traditional paper bags."
                   Submitted By: Charles Price, President and CEO
                                  Charah, Inc.

                                  Unit M, Suite 100
                                  307 Townepark Circle
                                  Louisville, KY 40243

                   Reprinted by permission from the September/October 2007 issue of Coal Power Magazine.
                                                                                                       Page 2 of 2