
OFF THE COAST OF KENT, England—A phalanx of sleek white windmills, rising nearly 400 feet out of the North Sea, is just the start of one of the world's most audacious green-energy programs.
The turbines are part of a project expected to be the world's largest offshore wind farm when it is completed later this year. But only for a while, because it's a prelude to something much bigger. In a few years, its developer, Swedish energy company Vattenfall AB, plans to start a new project farther offshore, in deeper waters, with turbines as tall as London's 580-foot Gherkin skyscraper.
A vessel carries turbine towers to the Thanet wind farm, off the coast of Kent, England.
Just one problem: Vattenfall has no idea how it's going to build it. "The equipment we need to operate in such rough waters doesn't exist yet," says Ole Bigum Nielsen, the project manager.
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