Absolutely; cost is a real challenge. But it is beginning to be addressed in many innovative ways. Also an issue is the "intermittency" of renewable technologies--ie, what happens when the sun doesn't shine or the wind doesn't blow! Storage costs are still high, though they are coming down. We will definitely see a future in which cost competitive renewables can be used on a 24/7 basis--in Africa!
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On intermittency, spot on. As we know, the clever inventive people out there are coming up with clever inventive solutions to get over storage and transient issues. And I love your vision for a future Africa where we have cost competitive renewables used on a 24/7 basis!