Sweden is rapidly becoming a European leader in battery and energy storage technology thanks to its plentiful renewable hydro and wind power, robust industrial history and ambitious climate targets. The country’s energy storage landscape consists of three major segments: large-scale lithium-ion manufacturing, advanced battery chemistry innovation (sodium-ion and nickel-hydride) and intelligent energy storage systems (BESS) for grid stabilization and fast charging. Swedish manufacturers are focusing on local production, safety and circularity, unlike many of their competitors who rely on Asian supply chains.
Here are five companies leading the way on this green transition. The range covers everything from Europe’s largest battery gigafactory, now under new ownership, to niche pioneers of non-lithium chemistries designed for safety and sustainability. They show that Sweden is not only adopting energy storage but also shaping the future of it.
Top 5 Swedish Battery and Energy Storage Manufacturers
- Lyten Sweden (formerly Northvolt)
- Polarium
- Altris
- Nilar International
- Repono
A Closer Look at the Top 5 Swedish Battery and Energy Storage Manufacturers
1. Lyten Sweden (formerly Northvolt)
In early 2026, US-based Lyten acquired Lyten Sweden, which was previously Northvolt’s Swedish entity, in a transaction valued at nearly $5 billion. The deal adds 16 GWh of existing production capacity, over 160 hectares of land and Europe’s largest battery R&D center and includes Northvolt Ett in Skellefteå (Europe’s first homegrown gigafactory) and Northvolt Labs in Västerås. The Swedish operations will be Lyten’s first industrial center, mixing Silicon Valley innovation with Swedish engineering.
Key Points
- Manufacturing capacity: 16 GWh current production of lithium-ion NMC batteries, ramping up as planned.
- Product focus: Battery Energy Storage Systems (BESS), automotive cells and next-generation lithium-sulfur batteries.
- Facilities: Skellefteå (Northvolt Ett) for large-scale cell manufacturing, Västerås (Northvolt Labs) for R&D and pilot production.
- Strategic co-location: Places battery production near AI-enabled data centers, fed with clean hydropower.
Achievements
- The restart of production at Skellefteå is scheduled for the second half of 2026 and within 12 months the number of new employees will increase to over 600.
- Reclaimed access to a €1.4 billion EU Innovation Fund grant previously awarded to Northvolt.
- The acquisition secures Europe’s largest battery R&D center, keeping critical IP and talent in Sweden.
Feedback
Industry observers see the Lyten acquisition as a rescue of Europe’s flagship battery champion after Northvolt’s bankruptcy filing in March 2025. Lyten’s lithium-sulfur technology promises higher energy density without cobalt, nickel, or manganese and could leapfrog conventional lithium-ion. But the new owners are also grappling with the same challenge of ramping up production and winning customer contracts in a red-hot global market.
Contact Information
Website: https://www.lyten.com
2. Polarium
Polarium, headquartered in Solna (Stockholm), is a leading developer of smart battery management and energy storage solutions for residential, commercial and industrial applications. The company’s engineers created fully integrated hardware and cloud-based software in Sweden, with a strong focus on scalability, safety and turnkey deployment. Unlike gigascale cell manufacturers, Polarium builds complete energy storage systems (BESS), including lithium‑ion batteries, energy management systems (EMS) and operational services.
Key Points
- Product Portfolio: Polarium Home (residential solar & self-consumption), Polarium Battery (modular lithium-ion) and Polarium Energy Storage (commercial & industrial BESS).
- Key feature: “Power Boost” technology for high-power EV charging from limited grid connections.
- Software: cloud-based platform developed and secured in Sweden/EU.
- End-to-end services: Installation, monitoring, maintenance and end-life handling.
Achievements
- Strategic partnership signed with VARO Preem (formerly Preem) for intelligent BESS solutions for next-generation fast charging at service stations across Sweden.
- Selected for high-profile commercial EV charging infrastructure projects, proving real-world reliability.
- Award-winning design and solid safety certifications.
Feedback
Customers appreciate Polarium’s turnkey approach and the ability to scale from single-home installations up to multi-megawatt commercial systems. The Power Boost feature has been particularly lauded for allowing for fast charging where grid upgrades would be prohibitively expensive. Polarium, a private company, is less visible than the gigafactory players but always ranks high among integrators in Nordic and European markets.
Contact Information
Website: https://polarium.com
3. Altris
Altris, an Uppsala-based innovator in sodium-ion battery technology that uses its proprietary Prussian White cathode material. The company was founded in 2017 and came from the Ångström Advanced Battery Centre at Uppsala University. Sodium-ion batteries are a sustainable alternative to lithium-ion, using abundant, low-cost and non-conflict raw materials with improved safety and recyclability. Altris is partnering to focus on stationary energy storage, low-voltage mobility and next-generation electronics.
Key Points
- Chemistry: Sodium-ion with Prussian White cathode; full European technology footprint.
- Applications: Stationary energy storage (grid, C&I), low-speed EVs and thin-cell electronics (wearables, IoT).
- Strategic pivot: Discontinued pilot production in Sandviken to consolidate R&D and commercial partnerships in Uppsala.
- Funding: €7.3m of new funding (2025) from existing investors such as InnoEnergy.
Achievements
- Together with Ligna, Jemac and RISE, we are developing the world’s first ultrathin sodium-ion battery for connected electronics, with support from Vinnova.
- EIT InnoEnergy supports us as a strategic European battery innovator.
- A complete industrialized cathode material process is available for licensing or joint venture scaling.
Feedback
Altris is seen as Europe’s most advanced sodium-ion player with a clear route to commercialization. Sodium is inherently safer (no thermal runaway) and does not use critical raw materials, which gives Altris a compelling value proposition for stationary storage and fire-sensitive markets. The move away from in-house pilot production suggests a conscious focus on core IP and partnerships rather than cell manufacturing.
Contact Information
Website: https://www.altris.se
4. Nilar International
Nilar International, based in Gävle, develops and manufactures nickel‑metal hydride (NiMH) batteries, specifically for stationary energy storage. Nilar hydride batteries are inherently safe for use in homes and offices and are non-flammable, unlike lithium-ion batteries. The batteries contain no scarce or conflict materials and are fully recyclable. The manufacturing process is much less energy intensive than lithium-ion. Nilar provides complete energy storage systems from cell to system, including electronics and control software, with no dependency on Asian cell imports.
Key Points
- Chemistry: Nickel-metal hydride is inherently non-flammable.
- Uses: Home solar power storage, commercial and industrial buildings, EV charging buffering.
- Fully integrated: Cell, system, electronics and software developed and manufactured in-house.
- Recyclability: Designed for effortless and complete recycling; uses less energy in manufacturing than Li-ion.
Achievements
- The loan of €47 million from the European Investment Bank (EIB) is supported by the EU’s InnovFin “Energy Demo Projects” program.
- Home storage and rapid EV charging prove commercially viable.
- The European Investment Bank has specifically singled it out as a European battery technology complementary to lithium-ion.
Feedback
Nilar occupies a unique niche. Its safety credentials are unmatched for indoor installations (schools, apartments, hospitals) and its lack of dependence on imported cells offers supply chain security. However, NiMH has lower energy density than modern lithium‑ion, making it less suitable for weight‑sensitive applications like EVs. The company’s focus on commercial and industrial stationary storage—where safety and longevity outweigh density—is a pragmatic market fit.
Contact Information
Linkedin: Nilar
5. Repono
Repono is a pan-European energy company established by EIT InnoEnergy in early 2024 and headquartered in Gothenburg. It owns and operates large-scale battery energy storage systems (BESS) throughout the continent. Repono is a deployment and operations specialist, not a manufacturer, with the ambition to scale Europe’s grid-scale storage capacity rapidly. The aim is to deploy 100 GWh by 2030, taking 10% of Europe’s expected 1-terawatt-hour storage market.
Key Points
- Business model: BESS asset owner/operator; provider of flexibility services to grid operators.
- Technology: Introduces new large-scale batteries and second-life EV batteries (acquisition of BatteryLoop).
- Software: Proprietary unified platform optimizes charge/discharge in response to market conditions.
- Backers: Founded by EIT InnoEnergy and backed by investors Schneider Electric, Stena Metall and Boryszew Group.
Achievements
- Launched in 2024 and quickly scaled to roll out BESS across a number of European markets.
- We are adding 25 experts to our existing Nordic operations. Integrated BatteryLoop (Gothenburg-based second-life battery specialist)
- A network of over 1,200 partners supports this initiative through InnoEnergy.
Feedback
Repono addresses a critical gap in Europe’s energy transition: the need for large-scale, profitable and professionally managed storage assets. Repono does not focus on inventing new batteries but rather on the ‘how’—deploying proven technology at speed, optimizing performance with software and providing bankable off-taker contracts to battery manufacturers. The 100 GWh target is ambitious but is based on the current operations of BatteryLoop and the ecosystem of InnoEnergy.
Contact Information
Website: https://repono.energy
FAQ
What are the main types of battery chemistry that Swedish manufacturers use?
The Swedish manufacturers are surprisingly diverse. Lyten Sweden manufactures a conventional lithium-ion NMC (nickel-manganese-cobalt). Altris is focused on sodium-ion with a Prussian White cathode and is completely lithium-free. Nilar uses nickel-metal hydride (NiMH). It is non-flammable and fully recyclable. Polarium has lithium-ion systems but adds its own software and management. Repono deploys new and second-life batteries across chemistries.
Why is sodium‑ion technology important and who leads it in Sweden?
Sodium-ion batteries use abundant, low-cost, non-conflict raw materials (salt, iron and manganese) and are safer by design than lithium-ion. Altris is the leading sodium-ion innovator in Sweden (and Europe), with a patented Prussian White cathode and a fully European technology footprint. The technology is well suited for stationary storage and low-voltage mobility.
Which Swedish battery manufacturer is best for residential and small‑business storage?
The Polarium Home battery integrates with solar panels, optimizes self-consumption and includes cloud-based AI software—the most complete residential solution. Polarium. Nilar’s hydride batteries are another excellent option for home storage because they’re non-flammable and safe. Both are strong brands in the Nordic market.
What happened to Northvolt and who owns its Swedish factories now?
Northvolt filed for bankruptcy in Sweden in March 2025 due to production difficulties, canceled orders and financial strain. Lyten of the US acquired Northvolt’s Swedish assets (including the Skellefteå gigafactory and Västerås R&D center) for around $5 billion in February–March 2026. The new company is Lyten Sweden and production is scheduled to resume in late 2026.
How do these companies contribute to Sweden’s green transition?
Sweden’s battery and energy storage sector directly supports grid stability as renewable energy (hydro and wind) expands; enables fast EV charging without grid upgrades (Polarium); develops batteries based on abundant raw materials (Altris and Nilar); and captures Europe’s largest battery R&D center (Lyten). Sweden’s largely fossil-free electricity mix also helps manufacturers, making their production carbon-low from the start.
Are Swedish batteries safe for indoor use?
“Nilar’s nickel-metal hydride batteries are engineered to be non-flammable and safe to install in-house next to critical equipment. Altris’ sodium-ion batteries also have better safety characteristics than lithium-ion, with zero risk of thermal runaway. Polarium and Lyten Sweden produces lithium‑ion systems that require approved safety systems but are suitable for indoor installation when standards are followed.
What is “second‑life” battery storage and which Swedish company specializes in it?
Second-life storage uses second-hand EV batteries, which usually have 70-80% of their original capacity, for stationary applications. In 2024 Repono acquired the Swedish second-life specialist BatteryLoop and integrated its Nordic operations and expertise. This method increases battery life and decreases waste.
How does the Swedish battery industry compare to China’s?
Sweden can’t compete on volume—China dominates global lithium-ion cell production. Sweden competes in niche innovation: sodium-ion (Altris), non-flammable NiMH (Nilar), vertically integrated smart systems (Polarium) and full value-chain control from cell to recycling. Swedish manufacturing also benefits from dramatically lower carbon electricity and close proximity to European customers. But the industry still is capital-intensive and sensitive to global lithium prices and trade policy.
