Although the European Union has legislated in the area of energy policy for many years, the concept of introducing a mandatory and comprehensive European Union energy policy was only approved at the meeting of the informal European Council on 27 October 2005 at Hampton Court. The EU Treaty of Lisbon of 2007 legally includes solidarity in matters of energy supply and changes to the energy policy within the EU. Prior to the Treaty of Lisbon, EU energy legislation has been based on the EU authority in the area of the common market and environment. However, in practice many policy competencies in relation to energy remain at national member state level, and progress in policy at European level requires voluntary cooperation by members states.
In 2007, the EU was importing 82% of its oil and 57% of its gas, which then made it the world's leading importer of these fuels. Only 3% of the uranium used in European nuclear reactors was mined in Europe. Russia, Canada, Australia, Niger and Kazakhstan were the five largest suppliers of nuclear materials to the EU, supplying more than 75% of the total needs in 2009. In 2015, the EU imports 53% of the energy it consumes. In January 2014, the EU agreed to a 40% emissions reduction by 2030, compared to 1990 levels, and a 27% renewable energy target. The target is the most ambitious of any region in the world, and is expected to provide 70,000 full-time jobs and cut €33bn in fossil fuel imports.
In 2015, the Framework Strategy for Energy Union is launched as one of the European Commission's 10 Priorities.
The Energy Union Strategy is a project of the European Commission to coordinate the transformation of European energy supply. It was launched in February 2015, with the aim of providing secure, sustainable, competitive, affordable energy.
Donald Tusk, President of the European Council, introduced the idea of an energy union when he was Prime Minister of Poland. Eurocommissioner Vice President Maroš Šefčovič called the Energy Union the biggest energy project since the European Coal and Steel Community. The EU's reliance on Russia for its energy, and the annexation of Crimea by Russia have been cited as strong reasons for the importance of this policy.