He reviewed germany s promotion of electricity from renewable energy sources and shared statistic figures of the development of different kind of renewable energy to demonstrate the political impact on technological development 他介绍了德国推动可再生能源电力利用的历程，并通过各类可再生能源在不同推动阶段的发展情况统计，讨论了政策对能源技术发展的影响。
