ENERGY STAR qualified new and rebuilt refrigerated beverage vending machines can save you more than 1,700 kWh/year, or $150 annually on utility bills.

On the website, in the right-hand column, are two lists of Qualified Vending Machines: new machines and rebuilt machines. Lists were updated November 19, 2012. There is also a savings calculator.

http://www.energystar.gov/index.cfm?fuseaction=find_a_product.showProductGroup&pgw_code=VMC