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Load-shedding has wrought havoc on the economy in recent weeks. It has also left some investors and citizens nervous about the possibility of a total grid collapse.

National blackouts can be triggered by a variety of factors. Terrorists, for whom SA has mercifully not been a major target, pose one threat. Another is state-sponsored hackers and cybercriminals, who have attacked energy infrastructure in the US, Eastern Europe and India in recent years...

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