Published online by Cambridge University Press: 24 September 2025
INTRODUCTION
Since the early 2000s, the future of Europe's energy system has been on top of the political agenda, particularly after the conclusion of the Paris Climate Agreement in December 2015 and the Russian attack on Ukraine on 24 February 2022. Climate change, security of supply and energy prices are dominating the debate, forming the cornerstone of the energy trilemma. Transitioning from a fossil fuel-based energy system to a net-zero one is the EU's new mantra. This move started after the signing of the Kyoto Protocol to the United Nations Framework Convention on Climate Change (UNFCCC) in 1997 and will continue to pre-occupy Europe for the coming decades independent of the energy market turmoil, due to the Ukraine war. Compared to other regions, the European Union (EU) has early on become a key player in climate policy. For example, in 2005, the EU took the lead by establishing a CO2 emissions trading system covering installations in the energy sector and manufacturing industry of its Member States (the so-called EU Emissions Trading System – EU ETS).
The EU has viewed the energy transition as an opportunity and a necessity for a new growth agenda for Europe which has led to the adoption of the 2050 climate neutrality goal and the European Green Deal (EGD).
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