Purely as an aside, I had the pleasure of visiting Iceland in August and it was great. Truly beautiful, rugged land.

Another way they've utilised geothermal energy is with large, sophisticated greenhouses which allow growing of many produce they would otherwise import. I only had the opportunity for a brief visit but a lot of it looked hydroponic with really interesting monitoring and control technology. (Plus the biggest bees this Antipodean has ever seen! These suckers were so big they didn't buzz, they rang the doorbell.)

My favorite memory is following a map to a small isolated hot spring off of some random gravel road in the middle of nowhere. It consisted of a hot-tub-sized pool and a shower.

Whoever was there before had left the shower running. We were the only people there, and hadn't seen anyone pass us on the (dead end) road, so it must have been on for quite a while.

Only when I went to for my pre-soak shower did I realize that it didn't actually have any kind of user-accessible way to turn it off.