Solar isn’t expensive any more. Prices have fallen so much it’s now one of the cheapest forms of electricity — the kind of thing someone living in a shanty town might want to install to replace a sooty diesel generator or an easily broken kerosene lamp.
And if nobody does anything, in a generation the main export will be refugees.
Batteries are also cheap now. Heck, if you’re talking about literal shanty towns, a bag of rocks on a chain attached to a dynamo bolted to the ceiling can store enough energy to be useful.
And if nobody does anything, in a generation the main export will be refugees.