A €2.14 Billion Vote of Confidence
European energy storage startups have successfully raised a cumulative total of over €2.14 billion in equity funding. This massive influx of capital underscores the sector’s pivotal role in renewable energy integration and grid stability.
According to new research by Avnet Silica based on Crunchbase data, investment momentum has accelerated rapidly. An impressive 84.4% of all funding was secured within the past five years, with nearly half (46.7%) raised in just the last three years.
Mechanical Storage: The Surprise Leader
Contrary to the popularity of chemical batteries, mechanical energy storage has emerged as the top funding category. It has attracted €696.7 million in equity investment, more than double the amount directed toward battery systems.
Funding in this sector is highly concentrated among a few key players tackling long-duration storage. UK-based Highview Power leads the pack with €339 million for its liquid air energy storage, while Switzerland’s Energy Vault secured €200.5 million for its gravity-based solution.
Interest in this sector continues to grow beyond initial startups. Italy’s Energy Dome raised €90.2 million for its CO2 battery technology, proving that investors are banking heavily on large-scale, non-lithium solutions for grid balancing.
EV Charging and Portable Power: Flexibility is Key
The second-largest funding category belongs to EV charging infrastructure integrated with energy storage. These startups raised €435.5 million, targeting off-grid locations and high-power charging sites that require battery buffering to support the grid.
Portable energy storage systems are also seeing significant demand, raising €127.1 million. Companies in this space are replacing diesel generators with clean battery solutions for construction sites, events, and temporary power needs.
BESS: Lithium Dominates, but Flow Batteries Rise
Startups manufacturing Battery Energy Storage Systems (BESS) have raised €331.8 million. Lithium-based technologies remain the standard, accounting for €236 million, with the vast majority going toward lithium-ion manufacturing and a smaller portion to lithium-sulfur.
However, alternative chemistries are gaining ground. Redox flow batteries attracted €76.1 million, led by iron-based technologies from companies like Germany’s VoltStorage. Hybrid systems, combining lithium-ion with ultracapacitors, also secured €17 million in funding.
Supply Chain: Securing Europe’s Independence
Investors are not just funding the storage devices, but the ecosystem behind them. Over €259.4 million has flowed into the supply chain, with 78% of this capital directed toward next-generation battery chemistry and cell production.
This push for sovereignty extends to software. Capital is increasingly moving into companies developing Battery Management Systems (BMS), diagnostics, and testing tools, which are critical for optimizing asset performance and safety.
Thermal Energy and Hydrogen: Decarbonizing Industry
Thermal energy storage (TES) startups raised €105.9 million, driven by the need to decarbonize industrial heat. The majority of funds went to sensible heat storage using materials like rock and salt, while phase-change material technologies also saw notable investment.
Meanwhile, Hydrogen and Power-to-X storage solutions attracted €73.7 million. Combined with supercapacitors, this diverse segment of alternative technologies accounted for €146.5 million, highlighting the search for varied storage durations.
Closing the Loop: Recycling and Second-Life
Supporting the circular economy, battery recycling startups raised €19 million to tackle end-of-life challenges. Innovators like Luxembourg’s Circu Li-ion and Germany’s tozero are leading the charge in recovering critical raw materials.
Additionally, the concept of “second-life” batteries is gaining commercial traction. Fourteen BESS startups are now actively promoting the use of retired EV batteries in their stationary storage products to lower costs and reduce waste.
Outlook
The €2.14 billion invested across these diverse technologies highlights a mature and strategic approach to Europe’s energy transition. While lithium remains essential, the heavy betting on mechanical and thermal storage signals a clear shift toward solving the long-term challenges of a renewable-heavy grid.
