This Wired article discusses how offshore wind farms are starting to be built.
On June 1, 2019, the Pilgrim nuclear plant in Massachusetts will shut down, a victim of rising costs and a technology that is struggling to remain economically viable in the United States. But the electricity generated by the aging nuclear station soon will be replaced by another carbon-free source: a fleet of 84 offshore wind turbines rising nearly 650 feet above the ocean’s surface.
The developers of the Vineyard Wind project say their turbines—anchored about 14 miles south of Martha’s Vineyard—will generate 800 megawatts of electricity once they start spinning sometime in 2022. That’s equivalent to the output of a large coal-fired power plant and more than Pilgrim’s 640 megawatts.