The market for products that will make data centers "greener" will take up 28 percent of the global market for data center products over the next five years, according to a new report by the market research firm Pike Research.

The report, titled "Green Data Centers," forecasts that size of the green data center market will grow from the current $7.5bn to $41.4bn by 2015.

"Cost of energy has seldom been a concern for IT departments in the past and there was little incentive to invest in energy efficiency improvements," Pike