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Conclusion

The 89,000 TW of sunlight reaching the Earth's surface is plentiful  almost 6,000 times more than the 15 TW equivalent of average power consumed by humans (ref-wikipedia). Additionally, solar electric generation has the highest power density among renewable energies, and with thermal storage can generate electricity in a predictable manner even when the sun is not shining.  CSP power plants further have the capability to meet a significant percentage of the future global electricity demand and are especially suitable to South Africa and its neighbours Namibia and Botswana.