The Taum Sauk upper reservoir rebuild is the largest structure of its type in North America. Located 110 miles southwest of St. Louis, Missouri, is a 450 megawatt facility. Back in 2005, the original rock-fill reservoir breached, releasing over a billion gallons of water and sending a 20 foot high crest of water down Proffit Mountain.

Buzzi Unicem USA was awarded the cement supply contract for the entire project. The reconstruction - started during the second half of 2007 - requested the use of nearly 3 million cubic yards of RCC (Roller Compacted Concrete).

The selection and use of RCC, as well as the expertise and service of all involved, has resulted in providing Missouri’s largest electrical utility company with a cost effective and expeditious rebuild of their reservoir compared to more conventional methods. Ameren UE’s Taum Sauk facility is scheduled to be back on line this summer.