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ABB Provides AmerenUE Pump Storage Plant with Equipment For Improved Functionality, Reliability

ABB completes retrofit of AmerenUE Taum Sauk Pump Storage Hydroelectric plant with complete ICE package

Charlotte, North Carolina, July 28, 2010 – ABB, the leading power and automation technology company, today announced it has completed a comprehensive project to provide power equipment for the AmerenUE Taum Sauk Pump Storage Hydro plant in Missouri.

ABB installed a complete integrated instrumentation, control and electrical (ICE) system package to help retrofit the AmerenUE 440 megawatt (MW) plant, allowing for improved functionality, reliability and modernization. The total project value was over $11 million.

“ABB's replacement of the plant controls – including installation in the new upper reservoir of the most advanced-level monitoring, control and protection system in the country – significantly improves the safety and reliability of the Taum Sauk Power Plant,” said Mark Birk, vice president, Power Operation for AmerenUE.

ABB began this project with a full audit of existing equipment of the 40-year-old AmerenUE Taum Sauk power station. This pump storage hydro plant is comprised of two units, both of which ABB upgraded.

The audit began with the general objective of evaluating the plant against modern designs and making recommendations to improve reliability, operations, maintainability and personnel safety developed from years of working on grass roots pump storage plants across the world.

The scope included ABB products and systems from four divisions – Power Products, Power Systems, Process Automation and Discrete Automation & Motion. This includes medium voltage switchgear, motor control centers, protection system, low voltage switchgear, battery systems, inverters, chargers, governor system, and System 800xA Extended Automation for the controls. This turnkey project includes all associated engineering, installation supervision, commissioning and training.

ABB made the announcement at the HydroVision International conference and exhibition event in Charlotte. ABB (www.abb.com) is a leader in power and automation technologies that enable utility and industry customers to improve performance while lowering environmental impact. The ABB Group of companies operates in around 100 countries and employs about 117,000 people. The company's North American operations, headquartered in Cary, North Carolina, employ about 12,000 people in 20 manufacturing and other major facilities.

CONTACT:

ABB Media Relations

Bill Rose

919.807.5743 - office

919.244.4879 - mobile

bill.rose@us.abb.com

www.abb.us

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