July 17 (Reuters) -

A federal agency has ordered a wind farm off the coast of

Massachusetts to stop power production and construction until an

investigation determines whether a blade failure affects other

turbines, it said on Wednesday.

Vineyard Wind's offshore wind project was shut down by

federal authorities after a turbine blade failure on Saturday

that caused pieces of fiberglass to fall into the water.

Wednesday's suspension order from the U.S. Bureau of

Safety and Environmental Enforcement prevents Vineyard Wind,

which is owned by Denmark's Copenhagen Infrastructure Partners

and Avangrid ( AGR ), from installing any more wind turbines.

The facility, the first major U.S. offshore wind farm, is still

under construction with only about a third of its planned

turbines in the water.

"Those operations will remain shut down until the

suspension is lifted," a BSEE spokesperson said in a statement.

The turbine is manufactured by GE Vernova ( GEV ).

Vineyard Wind said it has removed about 17 cubic yards,

or more than six truckloads, of debris from the damaged wind

turbine.

Beaches were reopened on the south shore of the island of

Nantucket on Wednesday a day after being closed because of

debris that had washed ashore, the town said in a statement on

its website.