For immediate release

CANTON, IL (November 2009) — For AmerenEnergy Resources Generating Co. (Ameren), Graycor Industrial recently completed an environmental retrofit project at the Duck Creek power station, a 440-megawatt, coal-fired generation facility, located in Canton, Ill. The fast-track, design-build project included replacing an existing FGD system with a wet flue gas desulfurization (WFGD) system.

The new scrubber system will more efficiently remove, or “scrub,” sulfur dioxide from the flue gas emissions. The retrofit project also included installation of an eight-cell, electrostatic precipitator and associated foundations and equipment. Hitachi, a leading global technological and industrial company, provided the absorber vessel – the first to arrive in the U.S. Chicago-based Sargent & Lundy LLC, a company that Graycor Industrial has teamed with on numerous projects, provided engineering services. St. Louis-based Sachs Electric provided electrical services for the project.

“In this tough market, Graycor Industrial’s team excelled at managing a multi-disciplined project while maintaining excellent safety and quality standards,” said Pablo Lara, Ameren’s project manager on this project, who recently retired from the company. For their safety efforts, in October 2008, the Graycor Industrial project team, along with Ameren and the West Central Illinois Building Trades Council, received a Certificate of Merit safety award from the National Maintenance Agreements Policy Committee (NMAPC) in recognition of having performed work with zero recordable injuries during a specified time frame at the Duck Creek plant.

Graycor’s past work at the Duck Creek plant includes performing a selective catalytic reduction (SCR) installation in 2003.

In recent years, Graycor Industrial has successfully completed a number of environmental projects including numerous mercury emissions control projects for Midwest Generation’s Illinois power fleet, as well as FGD retrofits for American Electric Power at its Conesville and Brilliant, Ohio, generating stations. In addition, a number of environmental projects have been completed across the U.S. for clients such as City Water, Light & Power; Northern Indiana Public Service Co. and Xcel Energy.

About Graycor Industrial Constructors Inc.

For more than 80 years, Graycor Industrial Constructors Inc. (Graycor Industrial) has been taking on the toughest heavy industrial construction projects across North America in a variety of markets including metals, power and process. The company has earned a reputation in the industry for developing long-term, collaborative partnerships that result in projects being completed efficiently, effectively and, most importantly, safely.

The Graycor companies – Graycor Industrial Constructors Inc., Graycor Construction Company Inc., Graycor Blasting Company Inc., and Graycor International – provide a wide variety of industrial and commercial construction services, as well as industrial maintenance technologies, across North America. As a top ranking industry leader with annual revenues in excess of $600 million, Graycor commits to safe working environments, demands excellence and rewards passion. Established in 1921, Graycor employs more than 1,500 construction specialists at the Chicago headquarters, regional offices and project locations across the United States, Canada and Mexico. For more information on the Graycor family of companies, visit www.graycor.com or call 1-800-455-0440.