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Spain is also super hot. So just install in public buildings aircons that just run when there is to much energy in the grid? Desalination plant that run when there is to much energy or in worst case run a few bitcoin servers. You will quickly realize you need more energy.
If we would have limitless energy, one decentralized currency would not be so bad in theory. But since our energy is limited, a centralized system makes much more sense. And yes the new creation of a new crypto by any organization, person or company is dodgy thing.