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by NAFV_P 4517 days ago
I did a quick calculation for the energy consumption of Tianhe-2, which has a power consumption of 17808 kW ...

1,538,611,200,000 J per day. Of course the Tianhe-2 is rated as the fastest, and the NSA won't be using something as big, but it gives you a rough idea of the power consumption of these machines.