Regarding climate protection and energy supply, 2020 is an important year for the EU. By then, ambitious goals should be reached, amongst others, a 20% increase of energy efficiency as well as a 20% reduction of greenhouse gas emissions (reference year: 2005). The GPP 2020 project followed up on these goals and directed its attention to the potential contribution of green public procurement. With its demand, EU's public sector can trigger a leverage effect in favour of energy-efficient and low-carbon goods and services.