The Combined Energy System (CES) developed by Ocean Motion International (OMI) consists of four sub-system components; a seawater wave-pump, a hydro-turbine electric generator, a reverse-osmosis filtration unit, and an electrolysis-hydrogen generation unit. The OMI CES is designed to operate on a large offshore platform, which is essentially a modified version of a standard modular offshore drilling unit. The system uses no external fuel resources to operate. The output of the system is potable water, electricity and hydrogen, which is delivered to shore through service piping and cabling.