The Icelanders already have a lot of geothermal energy and thanks to their volcanically active island, could likely harness a lot more. I know that for a while they were attracting energy intensive industries there like metal smelting and bitcoin mining because their energy is relatively cheap and abundant.
I went to a hydroelectric plant outside of Reykjavik.
The seasonal melting of glaciers provides a ton of energy as well.
Crystal blue water for miles.
In Summer, it’s one of the most beautiful physical places there are.