LONDON — The world's largest offshore wind farm had its grand opening Thursday — and its location on the estuary of the Thames River makes it a showcase for Britain's push to move beyond fossil fuels. So far, 100 wind turbines have been planted in waters up to 80 feet deep across the estuary in southern England. The idea is to produce enough electricity, 300 megawatts, to power the equivalent of 200,000 homes. Each turbine is nearly as tall as a 40-story building and the blades are at least 65 feet above the water for clearance with vessels. No turbine is closer than 1,600 feet to another and the entire "farm" covers an area of 22 square miles. Up to 341 turbines will be installed over the next four years. With Thursday's opening, which tops a 91-turbine farm off Denmark, Britain now has more offshore wind capacity than the rest of the world combined. in now gets three percent of its electricity from renewables but aims to get 15 percent by 2020. As part of that, the government this year awarded licenses to wind farm developers in a program that could deliver up to 32 gigawatts of generation capacity and require investment of more than $117 billion. MSNBC