Question: What did South Africa use before candles? Answer: Electricity.
For people living here, it is not that funny.
The country is undergoing its worst power crisis since 2008, with a rolling schedule of power cuts reintroduced in November as Eskom, the national electricity provider, struggles to meet demand.
In a report published on World Environment Day, the Africa Progress Panel makes the case for Africa to emerge as a "global renewable energy superpower". So could this be the solution to Africa's power trouble?