[XinhuaNet] The country [China] has set a quota on renewable energy use for large domestic power companies in its efforts to diversify energy sources and clean up the environment, the China Daily reported. Chinese power companies with an installed capacity of over 5 gigawatts must ensure 5 percent of their power generators are fueled by renewable energy sources by 2010. That proportion will rise to 10 percent by 2020, the report quoted Zhang Guobao, vice minister of the National Development and Reform Commission, the country’s top economic planning agency, as saying. Renewable energy sources include non-fossil fuels such as wind and solar power. Hydro and nuclear sources, however, aren’t on the list of renewable energy sources that power companies must develop, Zhang said.