Office equipment includes computers, monitors, printers and copiers, water coolers and external power adapters.
In a statement, the European Commission said it was the first time the Council and European Parliament have agreed to set mandatory energy efficiency criteria for public procurement.
EU energy commissioner Andris Piebalgs said the move would push manufacturers to put energy efficient equipment on the market, while making good use of public money.
The EU Energy Star programme follows an agreement between the US government and the European Union to coordinate voluntary energy labelling of certain energy-using products. In 2006 the scheme was estimated to have avoided 37.3 million tonnes of CO2 equivalent emissions in the US alone.