It was predicted that by 2012 up to 40% of
the budget of IT enterprise infrastructure would be spent on energy.
From: M. D. Dikaiakos, D. Katsaros, P. Mehra, G.
Pallis, and A. Vakali. “Cloud computing: distributed internet computing for
IT and scientific research.” IEEE Internet Computing, 13(5):10–13, 2009.
Not sure if this has come true but is a big number.
