Electricity demand is not constant because of peak periods when demand is higher and continuous growth in the number of customers requiring electricity services.
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To meet demand, older power stations and infrastructure are being used to full capacity.
In addition, routine and necessary maintenance of plant and infrastructure is scheduled to limit compromising supply capacity during periods of high demand.
Localised outages should not be confused with load-shedding.
Local outages occur when there is either a technical fault in the transmission or distribution network.
Outages can also occur when electricity equipment has been tampered with due to theft of cables or when there is an overload of the local system because of irregular high usage caused by electricity theft or normal faults.
Load-shedding is a controlled process that responds to unplanned events to protect the electricity power system from a total blackout.
While SA generally uses the word blackout loosely to mean “no lights” in our local area, a country-wide blackout has much more serious consequences.
Blackouts occur when there is too much electricity demand and too little supply, bringing the power system into an imbalance and consequently tripping the power system in its entirety.
Many countries and cities in other parts of the world have experienced complete blackouts. To restart their system, these countries have been able to tap into a power system from a neighbouring city or country.
South Africa has to rely on itself to start the system from scratch – energising one power plant at a time and one section of the country at a time.
In the event of a blackout in South Africa, it could take up to two weeks to restore full power, which would have a severe impact.
Keeping the power system balanced is to prevent a nationwide blackout, and when the national electricity grid is under pressure, Eskom reduces demand and implements a process of load reduction.
• Information provided by Eskom
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