Due to a shortage of capacity, Eskom will implement Stage 2 load shedding on Wednesday.
"As a result of a shortage of capacity due to a number of generating units still out of service due to breakdowns, Eskom will be implementing Stage 2 rotational load shedding from 9am and this is likely to continue until 10pm," said Eskom.
The power utility said its maintenance teams continue to work hard to bring the units back to service.
"Customers are reminded to treat all electrical points as live during load shedding. Eskom would like to sincerely apologise for the inconvenience caused.
"We continue to appeal to residents and businesses to use electricity sparingly during this period. Please switch off geysers as well as all non-essential lighting and electricity appliances to assist in reducing demand."
Stage 2 calls for 2 000MW to be rotationally load shed nationally at a given period.
Load shedding is conducted rotationally as a measure of last resort to protect the power system from a total collapse or blackout.
For Eskom customers, load shedding schedules are available on the Eskom website (http://loadshedding.eskom.co.za).
Eskom customers can also contact the customer contact centre at 0860 037 566.