Britain’s Daresbury Laboratory Blue Gene is the most energy efficient supercomputer in the world, according to the first ever Green500 ranking.

Based on the Top500 supercomputer list, Virginia Tech has factored in power consumption to produce the Green500 derivative.

Daresbury’s machine scores 357.23Mflop/W, followed by four other Blue Genes dotted around the world - the worst of these scoring 310.93Mflop/W.

Made by IBM, Blue Genes occupy 26 of the top 27 slots with Dell’s Stanford University PowerEdge spoiling the clean sweep at number six.

Near the top of both lists, the second most powerful computer in the world: Germany’s Forschungszentrum Juelich 223Tflopmax Blue Gene, is also the fourth most energy efficient.

Sadly for the UK, Daresbury’s machine is still only ranked 121st in the world for number crunching power.

The University of Edinburgh’s 63Tflop Cray is the UK’s fastest, ranked 16th for speed in the world, but 459th out of 500 for energy efficient at 21Mflop/W.