Things like a coal power station and power grid to distribute it are expensive to build and maintain and require cohesive national infrastructure but for relatively low start up costs you can start sticking up a windmill or solar panel up and power a house or small village. People can start to organise these things themselves without relying on a central government.
Also - there's the issue of dependency on small supplies of rare earths for the solar. Renewables aren't very 'environmentally friendly' - they just shift the consequences to where the minerals are mined from the point of use.
The real future are things like small scale Thorium reactors.
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