Is the 800MW not from Medupi unit 6. Not sure how much Koeberg is...
"With Koeberg’s unit 1 coming back online on Saturday or Sunday and Medupi’s unit 6 starting to generate its full capacity, Eskom is confident that it will be able to carry out its mandate to supply electricity to all South Africans.
“Koeberg unit 1 will be returned back to service this weekend after a three-month planned shutdown for refuelling,” Molefe said.
“Medupi unit 6 reached an 800MW milestone this week, helping to stabilise the power grid and avoiding load shedding yesterday"