Its runner shape was similar to that of a Francis turbine. The Kaplan turbine was an evolution of the Francis turbine. In December 2008, the rehabilitation of Unit 3's Francis turbine began. It is usually employed for low specific speed, vertical shaft francis turbine. The second equality above holds, since discharge is radial in a Francis turbine. Each generator is driven by a 254,000 horsepower vertical-axis Francis turbine. This type of turbine is usually a Deriaz or Francis turbine in design. Reversible turbine-generator assemblies act as both a pump and turbine (usually a Francis turbine design). It operates a 5 MW Francis turbine on a head. MW Francis turbine generator in Plant 1 and the entire project was finished in mid-2014. Each spillway drives a Francis turbine supplied by Dominion Engineering of Canada. A Francis turbine is an example of a mixed-flow turbine. It contains four Francis turbine generators for an installed capacity of 750 MW. The Francis turbine, named for him, is the first modern water turbine. The francis turbine wheels are cast of stainless steel and weigh 73 tonnes each.