EU Energy Storage: Policy, Data and Tracking Tools
Energy storage is increasingly treated by the European Commission as a core flexibility solution for a power system with rising shares of variable renewables. By shifting energy across time—charging when electricity is abundant and discharging when it is scarce—storage helps balance supply and demand, reduces congestion and curtailment, and can contribute to lower peak prices and improved security of supply. It also supports electrification in buildings and transport by smoothing local peaks and enabling smarter grid operation.
The EU storage landscape
Across Europe, the largest share of installed electricity storage capacity remains pumped-storage hydropower, a mature and long-lived technology. At the same time, battery storage has expanded rapidly, driven by falling costs, shorter permitting and construction cycles, and its suitability for grid services such as frequency response, balancing, and congestion management. The EU policy narrative increasingly positions storage alongside demand response, flexible generation, and grid upgrades as complementary tools for system reliability.
How the Commission tracks progress
To improve transparency and monitoring, the EU has strengthened two main “tracking” pillars:
- Competitiveness and deployment progress reporting
The Commission’s clean energy technology reporting and related analytical updates provide an EU-wide view of progress, bottlenecks, and competitiveness trends, including storage technologies. - Project-level visibility through the European Energy Storage Inventory
A dedicated EU-level inventory/dashboard improves visibility on operational and planned storage assets, supporting market understanding and evidence-based policymaking.
Policy guidance and implementation signals
A key reference point is the Commission’s Recommendation on energy storage (adopted in March 2023) and the accompanying Staff Working Document. Together, these documents frame storage as a priority for system flexibility and provide guidance and good practices for Member States, regulators, and market actors. These documents coincide with the publication of the Commission's Proposal for a Regulation COM(2023) 148 final amending Regulations (EU) 2019/943 and (EU) 2019/942 as well as Directives (EU) 2018/2001 and (EU) 2019/944 to improve the Union’s electricity market designl
to review the EU’s Electricity Market Design and the Proposal for a Regulation COM(2023) 147 final amending Regulations (EU) No 1227/2011 and (EU) 2019/942 to improve the Union’s protection against market manipulation in the wholesale energy market
The emphasis is on removing barriers that slow deployment, improving investment conditions, and enabling storage to participate effectively in energy markets and grid services—while avoiding distortions that would disadvantage certain technologies.
to review the EU’s Electricity Market Design and the Proposal for a Regulation COM(2023) 147 final amending Regulations (EU) No 1227/2011 and (EU) 2019/942 to improve the Union’s protection against market manipulation in the wholesale energy market
The emphasis is on removing barriers that slow deployment, improving investment conditions, and enabling storage to participate effectively in energy markets and grid services—while avoiding distortions that would disadvantage certain technologies.
What to watch
- Market design and access: whether storage can participate on equal terms in balancing, capacity, and ancillary services markets.
- Permitting and grid connection: queue management, connection costs, and timelines often determine project viability.
- Revenue stacking: the ability to combine multiple revenue streams (e.g., arbitrage + services) is critical for bankability.
- Technology mix: pumped hydro remains essential, but batteries and other solutions (thermal, hydrogen, long-duration concepts) will shape the next phase.
- Data quality: inventories and reporting are improving, but comparability and completeness remain ongoing work.
