Geotechnical studies of the seabed have begun by energy company Centrica for two wind farms off England's east coast. Centrica is investing £170 million in the sites three miles out from The Wash at Lynn and Inner Dowsing. It bought the projects from Renewable Energy Systems and AMEC in December. Both companies are continuing their involvement in developing the sites under contract to Centrica. The survey, being carried out by Fugro, will take boreholes of the seabed to assess the sites where the 60 turbines are to be installed. It will also assess the cable route which is to come ashore at Skegness. Construction of the wind farms is set to start in 2005. The 180 MW of output will supply customers of British Gas-Centrica's energy supply subsidiary. The company expects to invest a total of £750 million in renewable projects over the next five years.