It's not that hard for Iceland.
Iceland is sitting on a huge natural reservoir of geothermal power. On top of that, it has a population that's about a third of the city of San Jose, California. I could probably supply the electrical needs of Iceland's population with exercise bicycles.
Frankly, it's getting a bit tiresome having people wonder why a squirrel can jump from a tall tree without injury, so why can't a horse?
If you want to know what's going on in Iceland, look up the controversies on the aluminum plants they've built there, which use 3/4 of their entire electrical output.