“In exceptional circumstances additional Emergency load shedding could be required. Control Centres will shed load using emergency switching in order to protect the network. This will be less predictable and all customers can expect to be affected at any time.” ~ City of Ekurhuleni
Should load shedding take place, the schedules for Edenvale and surrounds can be found below. Greenstone and Modderfontein fall under Joburg Power.
These are the latest schedules available from Eskom, they were updated in November 2014.
Should any of these links fail, you can find the schedules on the City of Ekurhuleni website.
You may be interested in this article: Making Sense of Load-shedding Stages