interesting question and that reminded me of what someone was talking about last year (maybe not 100% related to your question). I don't know if he was trolling or was really doing it but it sounded very interesting.

mining in the middle of a desert!
you will get the below 0°C temperature during nights which last nearly 9 hours. and then you get the direct sun (the free source of electricity) for the rest of the day which you can use to power up miners and set up a efficient cooling system.
the setup may need a big investment but the cost from that time forward is practically nothing.