Blue Energy -- Ocean Power (Piston Pump & Racks) Fluid Pumping Apparatuses Powered By Waves Or Flowing Currents A new invention using "Double acting fluid piston pumps extracting energy from waves or flowing currents into electricity. A revolutionary fluid currents energy converter device by combining double acting fluid pumping apparatuses and moveable racks to convert Ocean waves or flowing currents into electricity. The present invention provide double acting pump mechanisms when the piston reciprocates inside the piston chamber as the piston is driven by a float according to rising and falling waves. Each pumping apparatus is driven by a float; the pumped fluid (water and/or air) is supplied to drive a fluid motor or a turbine, which in turn operates a generator to produce electric power. International Patent Application No. PCT/SG2011/000232