Ecopower Propulsion Systems, a subsidiary of Ocean Tug & Barge Engineering, is pioneering advancements in the next generation of workboat propulsion, featuring green, efficient varieties of hybrid drive.  The hybrid drive, as we will work with, is a marine drive system based on locomotive-type diesel electric propulsion, mechanical with diesel electric assist, or a combined battery/diesel electric drive system. Each type has its correct application for a marine drive arrangement as might be found in a workboat.