Iceland has the cheapest electricity in the world. They run heat under their roads so they don't need to be plowed. Aluminum is shipped to Iceland to be smelted just because the energy is so much cheaper.
Iceland's electricity usage per capita is 4x that of the United States, and more than 2x the next highest country (Norway). They're the largest producer per capita as well. The population is not large, mind you, but it's noteworthy.
https://en.wikipedia.org/wiki/List_of_countries_by_electrici...
The rate for businesses is 0.066per kWh vs 0.128 in the US.
All of which is obfuscated by taxes and subsidies of course. https://www.globalpetrolprices.com/Iceland/electricity_price...
Technically it may be cheaper in some small petrol states but that feels misleading.
Mind you I'm just regurgitating a quick google's worth + tourism fun facts.