The office in Exeter, Devon, contains a £30million IBM machine that fills halls the size of two football pitches and is thought to be the second most powerful system in the country.
But running it produces 12,000tonnes of carbon dioxide a year, dragging the organisation towards the bottom of a new 'green' league table published by the Department of Communities and Local Government.
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By 2011, the computer is expected to have a peak processing speed approaching 1 petaflop, equivalent to more than 100,000 PCs and more than 30 times more powerful than what is in place at the moment. It will have 15million megabytes of memory - but will require 1.2 megawatts of electricity to run.