Different countries and regions are introducing policies aimed at lowering the environmental footprint from the energy sector and increasing the use of renewable energy. In the United States, a number of initiatives have been taken at the state level, from renewable portfolio standards (RPS) and renewable energy certificates (REC) (Wiser and Barbose, 2008), to regional greenhouse gas emission control schemes. Within the U.S. federal government, new energy and environmental policies and goals are also currently being crafted, and these are likely to substantially increase the use of renewable energy. The European Union is trying to implement its ambitious 20/20/20 targets by 2020, which aim at reducing greenhouse gas emissions by 20% (compared to 1990), increasing the amount of renewable energy to 20%, and reducing the overall energy consumption by 20% through energy efficiency (EU 2008).