A Houston-based company, Hydro Green Energy, also uses current to generate electricity, but in a different way. The company uses the force produced by a hyrdroelectric dam to turn a 12-foot, 3-blade fan. This concept is similar to using ocean currents to turn turbines, but this flan is optimized to function with current flowing in one direction. This plant is the first hydrokinetic (using the motion of water) project that is federally licensed in the US.

http://www.hgenergy.com/technology.html

http://www.reuters.com/article/pressRelease/idUS142130+05-Jan-2009+PRN20090105