British Climate change minister Barker speaks in front of a new interactive Google Earth map in LondonLONDON (Reuters) – Dong Vitality launched a challenge on Thursday to test two new massive offshore turbines at its wind farm off England's Essex coast, marking a step forward within the subsequent technology of wind turbine know-how. Power minister Greg Barker opened the extension to Dong's 172-megawatt (MW) Gunfleet Sands wind farm, off Clacton-on-Sea. The 6-MW generators have been equipped via Siemens. The Division of Vitality and Local weather Alternate (DECC) stated the generators have the possible considerably to chop the cost of producing renewable energy from offshore wind. …