A friend of mine is a former Eskom engineer who has just commissioned a new 38 turbine wind farm in the Cape. I mentioned that I’d seen a picture of a solar array in the US that stretched as far as the eye could see, and he said the average solar installation today must cover about 2km² to reach any sort of scale.

We agreed that the environmental impact of these schemes is awful, yet none could exceed the output of just one of the coal-fired units at one of our new power stations, like Medupi which has six such units...

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