The Energy Star Office Equipment Program is a self-certification program initiated by the US Environmental Protection Agency. The EPA Energy Star programme aims to reduce energy consumption in electrical goods by putting in place measures to reduce energy wasted during idle. The EPA Energy Star is most widely used within the personal computer, printer, fax machine, copier and scanner markets. To obtain an EPA Energy Star manufacturers must demonstrate a 10-25% increase in efficiency above the level required by the federal standard.
 EPA Energy Star - http://www.energystar.gov/index.cfm?c=home.index
EPA Energy star logo 
For more detailed information regarding eligibility criteria for various product categories visit: http://www.energystar.gov/index.cfm?c=product_specs.pt_product_specs
For more information on the EPA Energy Star programme visit: http://www.energystar.gov/index.cfm?c=home.index