South Africa's power grid is under pressure: the how and the why

South Africans are facing another round of power cuts despite promises from South Africa's power utility, Eskom, that it would keep the lights on. Unexpected breakdowns and scheduled maintenance at various generation plants have been blamed for reduced generation capacity. These have compromised the stability of the national power grid. Below Thinus Booysen and Arnold Rix of Stellenbosch University explain what the power grid is and what keeps it stable - or not.
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