Sept. 6 (Bloomberg) -- Eskom Holdings SOC Ltd., South Africa’s state-owned electricity utility, lost about 200 megawatts of generating capacity after a transformer failed at its Grootvlei power station.

The availability of spare parts will determine how long it takes Eskom to bring the unit back on stream, spokeswoman Hilary Joffe said by mobile phone today.

To contact the reporter on this story: Jana Marais in Johannesburg at jmarais@bloomberg.net

To contact the editor responsible for this story: Alastair Reed at areed12@bloomberg.net