we first present the thoughts of these stakeholders regarding the predicted and possible energy mix in before discussing perceived barriers to a transition towards sustainable energy systems figures and breakdown the predicted and possible energy share by sector and reveal that opinion is often divided among the stakeholders as to which technologies will prevail in fact even among survey participants from within each sector opinions on technology choice varied quite substantially some experts predict that geothermal will form a substantial share of the energy mix while others opt for otec wind energy or natural gas the one technology almost all stakeholders agree will play a significant role is solar pv