BlueGene/Q is confirmed as the the most "green" HPC architecture.

BlueGene/Q is confirmed as the the most "green" HPC architecture. The June 2012 Green500, the list of the most energy-efficient supercomputers in the world, sees BlueGene systems in the first 20 positions.

CINECA is ranked in the Green500 at the 11th position with FERMI, the BG/Q system ranked at No. 7 on the June 2012 Top500 list with 1.72 Pflop/s performance. 

For further details about this please visit the the Green500 website.