The Nuclear Regulatory Commission says a power plant in Massachusetts has lost power and shut down during a massive snowstorm.

The NRC says the Pilgrim Nuclear Power Plant in Plymouth experienced an automatic shutdown at around 9:15 p.m. Friday after losing off-site power. Spokesman Neil Sheehan says the plant has declared an unusual event, which is the lowest level of emergency classification.

Sheehan says that the reactor shut down without any problems and that backup generators are powering plant equipment.

The NRC says there's no threat to public safety.

The shutdown came as a major snowstorm began clobbering the New York-to-Boston corridor, knocking out power to more than 300,000 customers in Massachusetts.