Cape Wind Associates told the Federal Bureau of Ocean Energy Management that it has ceased operations and was surrendering its federal lease for 46-square miles (119-square kilometers) in Nantucket Sound. Company Vice President Dennis Duffy disclosed the official notice December 1, according to the Associated Press.

Cape Wind proposed the nation’s first offshore wind farm with a 130 turbine project 16 years ago, but it was dealt major setbacks, including the termination of critical agreements with utility companies in 2015.

The project proposed using Siemens 3.6 megawatt wind turbines with a total capacity of 468 megawatts. The project was to have been located in federal waters off the coast of Cape Cod, Massachusetts, on Horseshoe Shoal.