Battery Energy Storage Systems in the European Union: A Review of Technologies, Applications, Market Trends, and Regulatory Challenges

The accelerated deployment of clean energy technologies is crucial to achieving large-scale decarbonisation and mitigating global climate change. However, the inherent intermittency of renewable energy sources, particularly solar and wind, represents a major challenge for grid stability by inducing fluctuations in power supply and reducing system efficiency. To mitigate these effects, battery energy storage systems (BESSs) have become a cornerstone technology owing to their rapid response, scalability, and capability to provide real-time balancing between energy generation and consumption. This study aims to examine the current state and future potential of stationary BESSs within the European Union (EU) energy framework. Through a comprehensive review of storage technologies, market trends, and regulatory developments, this research identifies the primary drivers and barriers influencing BESS adoption. This analysis focuses specifically on battery energy storage technologies, including their material requirements, degradation behaviour, and associated supply chain challenges, without extending to other grid infrastructure components such as power electronics or to cross-technology comparisons with alternative storage solutions. The analysis encompasses technical capabilities, economic viability, policy mechanisms, and ongoing projects across the EU. The results reveal that while BESS deployment is accelerating, progress is constrained by high investment costs, fragmented regulatory frameworks, and market design limitations. Nonetheless, supportive legislation, innovation in battery chemistries, and the expansion of flexibility markets are fostering an increasingly favourable environment for large-scale implementation. The findings provide stakeholders with a systematic understanding of how BESSs can enhance grid resilience, facilitate renewable integration, and contribute to the EU’s energy transition towards a carbon-neutral future.