The main renewable contribution in the Belgian energy mix comes from combustible renewable biomass and waste sources. In both regions there is a fast growing electricity generation coming from wind energy. Brussels-Capital has, because of its limited surface and electricity generation capacity, very limited renewable energy facilities, being mainly solar thermal demonstration projects.SolarConsidering all the existing buildings in Belgium, the potential roof surface that can be used to install solar panel equals around 250 km².Wind EnergyOver the last decade, onshore wind capacity has been highly developed in Belgium. In 2010, the Belgian onshore wind production capacity equalled 730 MW. The typical Belgian utilisation rate of wind generators is around 2,135 hours full capacity equivalent. Partially due to the rapid development of this energy source, anti‐wind lobbies are against a further development of new capacities arguing that wind turbines have a negative impact on landscape quality. In response to these criticisms, regional authorities have tried to determine where new windmills could be built. At present, windmills can only be installed in some restricted areas.Studies about renewable energy potential have been conducted both in the Flemish and Walloon regions in order to assess the maximum onshore wind capacities. In so far as Brussels is an almost exclusively urban region, no significant wind potential can be installed there.Different studies have tried to estimate the offshore potential of the Belgian maritime area. Mathys et al, 2010 indicates the maximum energy potential given that the Belgian continental shelf is covered by wind turbines except in some specific zones reserved for maritime navigation, military exercises and some visual limitations. The theoretical potential is estimated in range of 12.6‐16.8 GW. Biomass & BiofuelsIn 2009, biomass and biogas were used to generate 3.5 TWh or 3.8% of gross domestic electricity production. In 2010 5.07 million tonnes of waste was produced in Belgium. Of which 1.75 Mt was incinerated. Nearly all (99.8% of the time) energy was recovered during incineration. Non-renewable waste was used for producing 1.4% of the gross domestic electricity production. 1.9 Mt was recycled and 1 Mt was composted or fermented, only 0.062 Mt was dumped. Ten years earlier this percentage was only 0.71%.HydroIn 2010, hydroelectric net capacity equals 110 MW in Belgium. The hydroelectric potential is already largely used in Belgium and no important development is foreseen in the future. Therefore, the power capacity of this technology is supposed to equal 120 MW in all scenarios.