Bob’s your output

Manchester University has unveiled an innovative wave energy device that uses the ‘bobbing’ effect of water to create power.

Developed as part of the government- backed Carbon Trust initiative to research renewable energy technologies, the so-called Manchester Bobber would produce more power than offshore windfarms, it is claimed.

Peter Stansby, professor of hydrodynamics at Manchester University and co-inventor of the Bobber, said: ‘When you hear that a wind turbine produces 2MW, that actually indicates the maximum output. The Bobber’s output of 5MW is the mean power output, with the potential for much more depending on sea conditions.’

The waves produce an oscillatory motion that is converted into one-directional motion through a clutch, which drives the generator. If the system is put into full-scale use the Bobber units will be attached to a platform or rig — about 20m above mean water level to avoid the maximum wave height — with the mechanics and generator on top. Mounting the units on decommissioned offshore oil-rigs is also being explored by the team.