The plan would designate an area between Long Island and New Jersey as a priority offshore wind zone and sets a goal of installing 30,000 megawatts of offshore wind turbines in coastal waters nationwide by 2030, generating enough clean electricity to power 10 million homes. To help meet that target, the administration said it would accelerate permitting for proposed wind projects off the Atlantic coast, offer $3 billion in federal loan guarantees for offshore wind projects and upgrade the nation’s ports to support wind construction. Vineyard Wind is one of 13 offshore wind projects proposed along the East Coast, and the Interior Department has estimated that as many as 2,000 turbines could be rotating in the Atlantic Ocean by 2030.