The European Union's energy policy has shifted towards more cooperation and integration, moving away from a focus on energy-supply security. The European Commission has played a key role in this shift by re-framing energy policy as a complex mix of interventions. This change was driven by crises that threatened Europe's energy security. The Commission used strategic communication to push for a more integrated approach to energy policy, promoting ideas like energy security, market competitiveness, and environmental sustainability. Through case studies on wind power projects and energy efficiency directives, it was shown that the Commission successfully influenced national governments to adopt a more integrated perspective on energy policy.