IT budget and energy

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.