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Definitely not anything close to gigawatts: ALL of Google (not DeepMind, but the entire company) uses only about 260 megawatts.

Probably on the order of one megawatt or so.

http://inhabitat.com/infographic-how-much-energy-does-google...

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Still, wow! And a human is using 100W or so: (~400 max) https://sustainability.blogs.brynmawr.edu/2012/07/31/underst...

And don't forget, the human grows organically from a complex system of DNA that also codes for way more than playing Go! And is able to perform a lot of tasks very efficiently, including cooperating together on open ended activities.

And building an AI that can play better than itself :)

On the other hand, they've only been working on Alphago for two years.

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