The Federal Aviation Administration has again ruled that the Cape Wind wind farm off the Massachusetts coast poses no hazard to local airplanes.

A federal appeals court had ordered the agency to reconsider its previous finding, and the FAA said in a statement Wednesday that after an aeronautical study, it again found that the project's 130 turbines wouldn't endanger local air traffic.

The clearance is the fourth time the FAA has approved the $2.6 billion project since it was proposed for Nantucket Sound in 2001. The project aims to be the nation's first offshore wind farm.

Critics say it will be a hazard to air and sea navigation, will ruin the sound, and will offer overpriced power.

Cape Wind has already committed buyers and hopes to produce power by 2015.