Britain has not yet determined its target for renewable energy sources like wind and sun by 2020. European Union leaders agreed to a mandatory target of obtaining one-fifth of all energy from renewable sources by 2020, but did not specify how this target would be divided among member states. The renewable energy industry is concerned that Britain's lack of ambition may hinder progress. The Renewable Energy Association in Britain expressed frustration with the country's attitude towards renewables. Renewable energy is more environmentally friendly but also more costly than fossil fuels, requiring support for research, development, and installation to promote investment and reduce costs. Greene referred to EU data that indicated in 2005, Britain obtained only 1.8 percent of its energy from renewable sources, significantly lower than the EU-27 average of 6.7 percent. Despite committing to the EU target of 20 percent renewable energy, the UK government stated that they are still determining how to achieve this goal. Current policies are projected to reach 5 percent renewable energy by 2020, with the EU target considered ambitious. However, leaked documents suggest that doubling the renewable energy share to 10 percent would require an annual cost of up to 4.4 billion pounds by 2020. The documents indicated that Britain was in favor of a flexible approach, such as reaching targets through a method similar to carbon offsetting. This involves paying another party to install renewable energy on your behalf. EU Energy Commissioner Andris Piebalgs recently expressed support for a trading approach where wealthier EU countries invest in renewable energy in newer, primarily ex-communist members of the bloc. This proposal received a varied response from renewable energy companies.