The document is a response from the Sussex Energy Group to the EU's Green Paper on energy strategy. It discusses some of the tensions between pursuing sustainability, competitiveness, and security of supply as goals of energy policy. Specifically, it notes that sustainability and competitiveness may conflict if competitiveness is defined solely as low energy prices. It also argues that some government interventions to improve security of supply could conflict with competition objectives. However, sustainability and security may be mutually supportive if developing EU renewable resources reduces import dependence. Overall the response aims to provide a more nuanced perspective on balancing and potentially reconciling the different policy objectives.