Abstract: A buoyancy hydro power installation comprises wave energy collectors and compressors mounted on a platform at sea level which sits on a vertical tower extending below sea level and houses compressed air pipes, expansion pipes, compressed air storage chambers and a turbine at the submerged end of the tower, said installation being tethered to the sea floor. The wave energy collectors comprise buoyancy tanks mounted on the platform which move up and down with wave motion which drives the air compressors and there are sea current energy collectors comprising turbines which are mounted on the outside of the vertical tower.