Wind power industry has continued to grow rapidly in recent years with major developments in offshore wind farms. The avail- ability of large areas in order to locate major projects, the lack of existing limitations associated with visual impact and noise, higher wind speeds, and the lower turbulence levels in the offshore environ- ment have encouraged operators to invest in offshore wind farms. Despite all these advantages, power production from offshore wind is still signi
fi cantly more expensive than power generation from onshore wind farms. This is due to more complicated foundations, longer electrical networks, installation and maintenance activities that are dependent on vessels, and harsher climate conditions that limit the operability of vessels and subsequently the accessibility of offshore wind farms. Considering the UK with the greatest operating capacity in its waters, offshore wind Levelised Cost of Energy (LCOE) reached d140/MWh in 2011 (The Crown Estate, 2012); whilst onshore wind LCOE is d74/MWh (WindPower Offshore, 2012).