The most remarkable growth was in wind power, solar photovoltaic power (although from a small base) and biodiesel transport fuels, which only appeared in the mix in 2006. In compliance with the EU Renewable Electricity Directive (2001/77/EC), it established a target of 39% of gross electricity consumption to be met by renewable energy, including large hydropower, by 2010. This target translated into source-specific targets for installed capacity, which, however, can diminish investor flexibility and raise overall costs.