Many of you have probably heard of Energy Star, and you may even have some home appliances that are Energy Star certified. The Environmental Protection Agency has decided to extend this certification to data centers, which use about 1.5% of the total energy in the United States. The EPA hopes that this will give greater incentive to make data centers more efficient by allowing companies to market how "green" they are. To obtain the certification, data centers must be in the top 25% of their peers in energy use. The power usage effectiveness measurement will be used to determine the ranking, measuring how much energy actually reaches IT equipment based on how much is supplied to the data center.