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I've just read an article https://www.nu.nl/geldzaken/5081915/bitcoin-verbruikt-meer-stroom-dan-heel-nederland.html (in dutch, but it is based on a study done by Morgan Stanley) saying bitcoins will consume as much, mayber even more, electricity in 2018 as our whole country, the Netherlands. So that means the Bitcoin value should be something like $846 billion, since that is the projected GDP of our country for 2018.