Abstract: An energy conversion system for converting energy of naturally occurring fluid flow into output power. The energy conversion system includes an accelerator plate that has a leading edge and an upper surface that is substantially linearly inclined from the leading edge and transitions into a gradually increasing inclined shape so as to receive a fluid flow and form a vortex at a rear portion of the accelerator plate and a turbine positioned at the rear of the accelerator to rotate in the vortex created by the accelerator plate. The cross-sectional shape of the accelerator plate has a duckbill shape which causes the fluid flow to increase up to five times and before turbulence is created and directs the increased air flow onto the blades of the turbine.