The Pilgrim Nuclear Power Station in Plymouth, MA, automatically shutdown Monday night when one of the two 345-kV lines that provide power to the plant from offsite was lost, officials said.
The shutdown occurred at 9:21 p.m., said Carol Wightman, a spokesperson for plant owner, Entergy.
The other 345-kV line ended up removed from service by NStar last week for planned maintenance, Wightman said.
Pilgrim will come back online when NStar restores the offsite power lines. In the meantime, Wightman said engineers will perform maintenance at the plant that can only occur when the station is offline.
When the offsite power stopped, the plant’s emergency diesel generators kicked in and will continue to power the plant until NStar power ends up restored.
Workers have had to manually shut down the nuclear power station twice since August.