This document discusses the history and development of EU energy policy. It notes that while the idea of a common European energy market was initially based on coal and nuclear energy cooperation in the 1950s-60s, a single energy policy has been slow to develop. Recent conflicts have highlighted the need for energy independence and diversification. The document outlines key steps in EU energy policy over time, including the establishment of emissions trading schemes and renewable energy targets. It also discusses the need for greater physical interconnectivity between some EU member states' energy infrastructure and common energy sector regulations to fully achieve a single energy market.