The paper reports main problems of stimulating development of renewable energy in Ukraine. The authors consider presented state mechanisms for maintenance of the green energy where the most effective tariff is the feed-in tariff (functions in Ukraine from 2009). The changes in the active laws and the results of effect of the regulation policy on the development of renewable energy are described. The principal challenges of the law regulation relative to the renewable energy projects as well as proposals for improving the present policy are also discussed.