Decisions about decarbonising future energy supplies cannot be separated from other energy policy considerations. Ensuring a reliable and secure supply of energy has become increasingly important in the light of a potential decline in global oil and gas production, as well as many coal-fired and nuclear power plants reaching the end of their operational lives (Pidgeon et al., 2008). These facilities need to be replaced by other (low carbon) energy production technologies that can deliver reliable, secure, and affordable energy. The internationalization of energy markets has increased dependency on foreign energy imports, making Europe more vulnerable to interruptions of supply (Umbach,2010); while rising energy prices and a prolonged economic crisis across parts of Europe has led to widespread fuel poverty and concerns about the affordability of energy (Boardman,2010).