Rebaba, a Swedish energy technology company developing battery energy storage systems from second-life electric vehicle batteries, has raised $4.6 million (SEK 44.1 million) in an oversubscribed seed round. Sistafund led the financing alongside EIT Urban Mobility, existing shareholders and new European investors.
Scaling Circular Battery Storage
Rebaba combines recovered EV batteries with patent-pending technology to provide energy storage for residential, commercial and industrial applications. The Companion 40 kWh system and larger Containerised solution support load shifting, renewable energy storage, peak shaving and grid balancing.
Following a year of production at the CircularHub in Stockholm, Rebaba has commercial deployments across Sweden and recently signed agreements in Sweden and Denmark. Expansion plans include increasing CircularHub capacity to 40 MWh annually, hiring across multiple roles and establishing additional manufacturing hubs outside Sweden.
Paula Runsten, Rebaba Co-Founder & CEO, comments: “Demand for energy storage is accelerating globally, driven by AI, electrification, and the transition to renewables. Conventional thinking is that we must produce new batteries for every energy storage system being deployed, but this simply isn’t true. Electric vehicle batteries are retired with 70-80% of their useful life remaining, and by 2028, returning EV batteries are projected to offer more usable capacity annually than the entire global demand for stationary battery storage. The batteries already exist. Our job is to make reuse scalable.”
“Europe has spent years trying to catch up in battery manufacturing. Second-life gives us a way to actually compete, profitably.”
Expanding Across Europe
Rebaba has distribution agreements covering Sweden, Scandinavia, Germany, Austria, Switzerland and France, with additional European partnerships awaiting announcement. The network includes KP Energy, OKQ8, nanuq and Smartports.
Felix Kruse, Rebaba Co-Founder & CTO, comments: “The Rebaba platform is built to work with virtually any electric vehicle battery. By keeping the complexity within our core technology, we can assemble the rest of the Rebaba system from standard, locally available components. In practice, this means that essentially any technician, anywhere in the world, can build a Rebaba system.”
“That flexibility is what has opened the door to so many of our partnerships, both in how we source batteries and how we reach new markets. It allows us to offer clean, European-engineered, high-performance energy storage systems anywhere in the world, at a price point that competes with the cheapest alternatives. That combination of performance without the premium is what makes Rebaba systems affordable and scalable.”
Marie Geneste, Partner at Sistafund, comments: “Europe’s energy transition depends on scaling storage fast, without creating new dependencies on scarce raw materials or costly imports. Rebaba turns retired EV batteries into high-performance storage systems that can be built locally and compete on price. That is what convinced us to lead this round: circularity without compromise, and a team with the potential to build a European leader in energy storage.”