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Taum Sauk FAQs

Taum Sauk Facts and Figures

Ameren Missouri’s 440-megawatt Taum Sauk Pumped-Storage Hydroelectric Plant is back online, safely and reliably generating power when it’s needed the most. We've gathered answers to frequently asked questions about the rebuilt upper reservoir at Ameren Missouri’s Taum Sauk Pumped-Storage Hydroelectric Energy Center. 

The upper reservoir is capable of holding about 1.5 billion gallons of water.
The walls are close to 100 feet tall.
Safety features include redundant water-level sensors, continuous video monitoring and an overflow release structure. 
The upper reservoir has about three million cubic feet of roller-compacted concrete. 
More than 1,000 workers were on-site during the peak construction period. It took more than three million man-hours of construction work. 
Paul C. Rizzo Associates was the engineer of record. The principal contractor was Ozark Constructors, a venture partnership formed by ASI Constructors, Inc., and Fred Weber, Inc. 
The cost to rebuild the upper reservoir was approximately $490 million. 
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