In a study by Greenpeace ("Towards a Fossil Free Energy Future"), the Stockholm Institute investigated a strategy to phase out fossil fuels by the year 2100 and to phase out nuclear power by the year 2010. This was possible by a step by step reduction of CO2 emissions with 10% by the year 2000 (in comparison with the year 1988), 26% in 2010, 68% in 2030 and finally 100% in 2100. The Institute has judged the strategy to be feasible and potentially economically beneficial.
Twelve US states have enacted renewable electricity standards.