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In page Renewable energy in South Africa:

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Of all South African renewable energy sources, solar holds the most potential.[3] Because of the country's geographic location, it receives large amounts of solar energy.[3] Wind energy is also a major potential source of renewable energy.[5] Due to the high wind velocity on the coast of the country, Cape Town has implemented multiple wind farms, which generate significant amounts of energy.[5] Renewable energy systems in the long-term are comparable or cost slightly less than non-renewable sources.[citation needed] Biomass is currently the largest renewable energy contributor in South Africa with 9-14% of the total energy mix.[6] Renewable energy systems are costly to implement in the beginning but provide high economic returns in the long-run.[7]