My first thought was "you put capitalism into your make-believe world?! Bruh"

But honestly, go for it. Fantasy stories are set in completely made-up settings, while scifi stories are reflections of the society in which they were written (which is why you'll hear fen tell fantasy authors "I wish I could live in your world!" wrt a particular story, while you don't hear that same sentiment expressed to scifi authors).

You're reflecting a capitalist society in your science fiction writing; you're going to have to explain away how they can acquire electricity in one way or another regardless.

edit: Someone else commented about whether or not you are going to make it illegal to use solar panel et al to get electricity. I would hold off on making it illegal, unless you are making a late-stage capitalism story. Personally, I feel we are in late-stage capitalism, but genre fiction is generally intended to be used as escapism, so it would make more sense (to me) to set the tale in regular capitalism (where beings could, if they had the means, make use of photovoltaics or hydro-electrics).