Bitcoin uses energy and does not need to be renewable.

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It does not necessarily have to be renewable, however. Why does bitcoin need more energy than entire countries? Well, this happens because the process of "mining" the cryptocurrency uses gigantic servers that do not stop working, which consumes a lot of energy.

You can see in the following image an index of bitcoin energy consumption by Digiconomist.

Image: https://static.dw.com/image/56591385_7.png