Business Green: Scottish renewables firm Green Ocean Energy hopes to have a working prototype of a 500KW wave power machine that could be fitted to the base of offshore wind turbines by 2010. The company says the economics of both machines are enhanced as infrastructure such as the foundation and cabling can be shared. The Wave Treader system has two arms that extend either side of a fixed structure which lifts and falls with the waves, driving hydraulic fluid. The hydraulic fluid spins …