Are you thinking battery, third rail, or cantenary? The latter two are much more infrastructure heavy so you might not see them at the outer edges of a network.
I was picturing a kind of jury-rigged ‘both’ where each town or village has set up cantenaries extending our as far as they can manage, and it uses its batteries between villages. I imagine it’d stop for a moment and raise or lower the pantographs, sort of similar to the silver line in Boston. I don’t know if that’s realistic but it felt like splitting the difference in an interesting way.