Unit 1 of South Africa’s sole nuclear power plant will be shut down for just over a month from Monday as part of routine refuelling and maintenance, power utility Eskom said on Sunday.

The power plant, known as Koeberg, has two units and provides 1,800 megawatts of power to the national grid.

“The refuelling outage takes just over a month and the unit is expected back online towards the end of October 2016,” Eskom said in a statement.

Eskom said it will also perform other maintenance works on the plant during the outage.