When some are just plugging in a lightbulb and a phone and others are plugging in "energy-inefficient televisions and refrigerators" perhaps either the wealthier should abstain from doing so or should instead invest in more capacity.
On a larger scale this would be accomplished with meters and prices that would make using 100x more juice than your neighbor either uneconomical or at least costly enough to build infrastructure but on this scale it would have to have been solved by common sense which like electricity appears to have been scarce.
Grid scale solar is dirt cheap, to the point of being cheaper than coal, but it requires a grid. Not really sure what the point of them highlighting this was. If the villagers had a reliable grid connection, they wouldn't care if it was fed via solar