The invention is an apparatus and method for harnessing wave energy by transforming it in potential energy of water in a reservoir, to be converted in mechanical energy through a classical, proved in time, low head water turbine. The invention maximizes the throughput by raising the water head regardless of the unpredictable wave behavior, to a predictable head. The cost of it is greatly mitigated by sharing the facilities with wind power, desalination and hydrogen generating facilities as well as lodging facilities having all necessary ingredients generated on board.