Easy. Alaska. Why? You get paid thousands just for being there, offsetting any electric costs.
Actually I know this is probably a joke but

if you went to somewhere like Alaska where it's pretty much cold all year round you wouldn't have to worry about cooling as much so that will probably keep the electricity cost down in the first place, either that or you can go to a really hot and sunny country where solar electricity is ridiculously easy to get and just make your own electricity.