OFFSHORE APPARATUS FOR EXTRACTING ENERGY FROM A FLUID AND METHODS FOR ITS USE

An apparatus is disclosed for extracting energy from an oscillating working fluid. The apparatus comprises a housing 50 which is positioned on a floatable support structure 120/130 that is arranged in use to float on a body of water having waves. The the housing has an internal flow passage for receiving air; and a turbine 60/70 which is disposed at the housing. A unidirectional flow of the air is drawn out of the chamber by the use of an OWC created by respective incoming and outgoing flows of waves. The unidirectional flow of the OWC acting on the turbine 60/70 is responsive to, and generated by, only one of the flows of the waves.