BOSTON (AP) — A massive snowstorm packing hurricane-force winds has knocked out power to 400,000 customers in Massachusetts and has shuttered a nuclear power plant.

By early Saturday, NStar had reported more than 240,000 customers without power and National Grid had 165,000. Most of the outages are in southeastern Massachusetts and Cape Cod, where wet heavy snow and winds gusting over 75 mph have been reported.

One of the outages was the Pilgrim Nuclear Power Plant in Plymouth, which shut down after losing off-site power. Authorities say there’s no threat to public safety.

State officials have said about 2,000 utility crews are prepared to respond to storm outages but won’t be able to do so until conditions are safe for them.