The state’s nuclear power station in Plymouth powered up again Thursday night following its latest shutdown.

“Pilgrim Nuclear Power Station reconnected to the grid tonight after a planned outage to fix a steam leak,” Patrick Thomas O’Brien, a spokesman for Pilgrim and plant owner Entergy, said in a statement released before 11 p.m. Thursday.

The coastal power plant had been shut down for a week. After it was powered down for turbine testing on Thursday, Dec. 15, the steam leak was identified and plant operators chose to take it offline to make repairs.

Pilgrim operators have used a series of shutdowns in recent years to perform maintenance work. The plant is scheduled to power down for the last time on May 31, 2019. Pilgrim critics say problematic assessments of the plant from the Nuclear Regulatory Commission are evidence that it needs to close immediately. Pilgrim officials say the plant is safe and have repeated over the years that the safety of the public and plant staff has not been put at risk.