Enhancing State Energy Security Planning and Emergency Preparedness Act of 2018 This bill amends the Energy Policy and Conservation Act to provide financial assistance to states for the development, implementation, review, and revision of a state energy security plan that assesses the state's existing circumstances and proposes methods to strengthen the ability of the state to have a reliable, secure, and resilient energy infrastructure. A state energy security plan must contain specified content, including a risk assessment of energy infrastructure and cross-sector interdependencies, and address potential hazards to each energy sector or system, including physical threats and cybersecurity threats.