Deepwater Wind will build off Long Island

The US offshore wind industry has been launched.

Deepwater Wind, which is completing the first US project off the coast of Block Island, has reached agreement with the Long Island Power Authority to build a 15-torbine (90MW) offshore wind farm east of Montauk Point. That’s near both the Block Island project and an additional tract of ocean that Deepwater has leased off the coast of Martha’s Vineyard. The LIPA board is expected to approve the agreement Monday.

Deepwater is one of three developers looking to build more than 10 times that amount of wind power in federal waters south of the Vineyard off the coast of Massachusetts. How much — likely somewhere between 1,200 and 2,000 MW, will be determined by the final shape of an energy bill expected to be approved by the Legislature after differences between House and Senate versions are ironed out.

Offshore energy offers a vast untapped resource for the United States, with the US Department of Energy estimating that a total of 600 GW of offshore wind power — about six times the amount of power the nation now uses — can be captured off both coasts.