Best Energy Storage Tech Companies in Stockholm County, Sweden
The 35 best Energy Storage Tech companies in Stockholm County, Sweden in 2026, ranked by funding and momentum. Funding, investors, founders, valuation, tech stack and live signals. Top: Polarium.
Our analysis of 50 Energy Storage Tech companies
$13.7b in tracked funding; 88% of the stack-profiled cohort runs cloud-native; funding activity peaked in 2025.
Ranked: Best Energy Storage Tech companies in Stockholm County
| # | Company | Employees | Disclosed funding | Last round | Founder | Tech stack | Web popularity | Patents & IP focus | Recent signals |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Polarium 🦄 Developer of battery management systems and energy storage hardware solutions | 550 | $274M | 23 mo ago | Stefan Jansson Founder | WordPressApple iCloud MailMicrosoft 365+32 | Top 5M | — | — |
| 2 | Eways Provider of charging solutions for electric vehicles | 135 | — | — | Petra Sahlgren Co-Founder & CDO at EWAYS™ | Cart FunctionalityWooCommerceWordPress+30 | Top 5M | — | — |
| 3 | Echandia Manufacturer of maritime battery systems engineered for heavy-duty vessel applications | 30 | $36M | 18 mo ago | — | WordPressMySQLPHP+23 | Top 5M | — | 1 launch |
| 4 | Waybler Electric vehicle charging solution | 24 | $2M | 98 mo ago | Kurt Hognelid Co-Founder & CEO | Node.jsThree.jsBootstrap+14 | Top 10M | 13 patents Integrated curbstone street furniture with built‑in EV charging and smart power distribution | — |
| 5 | Brick Provider of power banks | 24 | — | — | Emil Esselin Co-Founder & CEO | Node.jsBase UITailwind CSS+21 | Top 5M | — | — |
| 6 | Enerpoly Manufacturer of zinc-ion batteries | 12 | $2M | 33 mo ago | Mylad Chamoun Co-Founder & CTO | RubyAnimate.cssVarnish+16 | Top 10M | 10 patents Aqueous rechargeable batteries using manganese‑dioxide cathodes and anti‑corrosive chlorinated electrolytes | — |
| 7 | SaltX Technology Saltwater based energy storage system | 12 | $17M | 74 mo ago | — | WordPress Block EditorWordPressMySQL+17 | Top 10M | — | — |
| 8 | myFC Fuel cell technology solution provider | 11 | $7M | 88 mo ago | — | — | — | 138 patents Fuel cell power modules and hybrid energy management for electric vehicles | — |
| 9 | Cling Systems Provider of a platform for sourcing and transacting battery materials | 7 | $2M | — | — | — | — | — | — |
| 10 | Vehicle Charge Grid Digital platform offering charging solutions for EVs | 6 | — | — | — | — | — | — | — |
| 11 | Zelk Production of hydrogen | 5 | — | — | — | — | — | — | — |
| 12 | Southern Lights Green hydrogen projects assessment solution | 3 | $2M | 30 mo ago | Anton Frisk Co-Founder | WordPressMySQLPHP+21 | Top 50M | — | — |
| 13 | Solelia Greentech Developer of solar banking system | 3 | $115K | 93 mo ago | Daniel Wahlberg Founder & Board Member | — | — | — | — |
| 14 | Tether Provider of energy storage systems for electric vehicles | 2 | $20K | 15 mo ago | Luis Rivas Co-Founder & CEO | VimeoBootstrapApache HTTP Server+7 | Top 50M | — | — |
| 15 | Reload Provider of plug-in charging solutions for EVs | 2 | — | 48 mo ago | — | Tailwind CSSNginxIntercom+4 | Top 50M | — | — |
| 16 | Charge Amps Provider of electric vehicle charging products, services, and related accessories | 1 | $44M | 53 mo ago | Boel Swartling Co-Founder | WordPressMySQLRedis+31 | Top 5M | 13 patents EV charging connectors and sockets with integrated visual status indicators | — |
| 17 | Flower Provider of energy storage solutions | — | $109M | 22 mo ago | John Diklev Founder & CEO | WordPressApple iCloud MailGoogle Workspace+18 | Top 5M | — | — |
Top 12 Energy Storage Tech companies in Stockholm County
#1
Polarium 🦄Series D · Stockholm, Stockholm County · founded 2015 · 550 employees$273.6Mraised▾
Developer of battery management systems and energy storage hardware solutions. These products facilitate energy storage for residential, commercial, industrial, and telecommunications applications. The hardware integrates with software to manage power availability, optimize energy consumption, and support grid stability. The systems enable users to store energy for reserve power, reduce costs through peak shaving, and participate in energy markets. The technology supports the integration of renewable energy sources by providing scalable storage capacity for various infrastructure requirements.
#2
Series B · Solna, Stockholm County · founded 2009 · 30 employees$36Mraised▾
Manufacturer of maritime battery systems engineered for heavy-duty vessel applications. These systems are designed for safety, durability, and optimized performance in demanding maritime environments. The battery systems handle rapid charging, high power peaks, and numerous cycles without degradation. They offer long lifecycles and are suitable for various vessels, including ferries and naval ships.
- Mar 2025Series B$34M
- Aug 2018Grant (prize money)$1.4M
- Sep 2016Grant (prize money)$533.8K
- Jan 2016Grant (prize money)$44.1K
#3
Series A · Stockholm, Stockholm County · founded 2020$108.6Mraised▾
Provider of energy storage solutions. They offer wide range of solutions such as virtual power plant,grid balancing services,renewable energy integration and AI driven energy optimization solutions. They offer an AI powered platform to stabilizing the energy system by enhancing predictability and flexibility.
- Nov 2024Series A$21.7M
- Aug 2024Series A$27.5M
- 2024Conventional Debt$44.1M
#4
Seed · Stockholm, Stockholm County · founded 2020 · 2 employees$20Kraised▾
Provider of energy storage systems for electric vehicles
- Jun 2025Seed$1.5M
- 2023Seed$20K
#5
Series B · Solna, Stockholm County · founded 2012 · 1 employees$44.4Mraised▾
Provider of electric vehicle charging products, services, and related accessories. The company develops user-friendly charging solutions for homes, businesses, and public spaces. Product offerings include chargers, cables, mounting equipment, and monitoring devices. Services encompass cloud-based management, connectivity solutions, and certified installation support.
- Apr 2022Series B$15.9M
- Mar 2021Series B$15.3M
#6
Seed · Stockholm, Stockholm County · founded 2018 · 12 employees$1.9Mraised▾
Manufacturer of zinc-ion batteries. It develops environmentally friendly and rechargeable zinc-ion batteries for stationary energy storage solutions. Additionally, it offers non-toxic and recyclable zinc-ion batteries.
- Dec 2023Grant (prize money)$8.4M
- Oct 2023Grant (prize money)$600K
- Mar 2023Grant (prize money)$9.9M
- Dec 2022Seed$1.5M
#7
Seed · Stockholm, Stockholm County · founded 2022 · 3 employees$1.7Mraised▾
Green hydrogen projects assessment solution. It provides a SaaS based tool to design, simulate and assess economics or feasibility of hydrogen projects. It allows customers to iterate faster on project designs and increase the quality and auditability of the hydrogen projects.
- Mar 2024Seed$1.7M
#8
Public · Stockholm, Stockholm County · founded 2001 · 12 employees$16.6Mraised▾
Saltwater based energy storage system. It has developed SaltX technology, which stores energy in salt crystals and converts it to heating and cooling, reducing energy consumption and costs by 1/3 as per their claims. It has three products HeatBoost for a water heater or a boiler, Verdacc for air conditioning of vehicles such as trucks, buses and construction equipment, CoolStore for air conditioning and energy storage to products such as solar thermal collectors and co-generation engines.
- Jun 2020Grant (prize money)$2.2M
- Jul 2018Grant (prize money)$2.3M
- Mar 2015Grant (prize money)$54.3K
- Nov 2010Grant (prize money)$100K
#9
Public · Stockholm, Stockholm County · founded 2005 · 11 employees$6.7Mraised▾
myFC is a provider of fuel cell technology solution that develops micro fuel cells. Claims to have secured multiple patents around proprietary shape-flexible fuel cell systems with varied power density, Has also developed a commercial portable charger. Claims to be using planar technology featuring power density over 600 mW/cm3.
- Apr 2019Post IPO$4.2M
- Feb 2019Grant (prize money)$53.9K
- Feb 2016Grant (prize money)$524.1K
- Jul 2011Series A$6.7M
#10
Series A · Solna, Stockholm County · founded 2015 · 24 employees$2.4Mraised▾
Electric vehicle charging solution. It focus on charging multiple cars at the same time while minimizing costs. It provides charging solutions for residential and commercial markets.
- Jun 2018Series A$2.4M
#11
Seed · Stockholm, Stockholm County · founded 2020 · 7 employees$2.3Mraised▾
Provider of a platform for sourcing and transacting battery materials. The platform facilitates the buying and selling of surplus, overstock, off-spec, recalled, and end-of-life batteries. It offers tools for negotiation, deal management, and fulfillment. The platform supports various battery formats and chemistries.
- Seed$2.3M
#12
Deadpooled · Stockholm, Stockholm County · founded 2011 · 3 employees$115.2Kraised▾
Solelia has developed a Solar Bank to allow EV charging infrastructure to be connected to networks of photo-voltaic power production plants. The system works like a bank where the user can store extra power generated from their solar rooftops in the solar banks (virtual), once the company sets up solar charging stations, EV users can use them to charge their vehicles, thereby paying money to the solar generator who had initially banked a portion of this generation. The information in the Solbank comes from standard utility meters, which are installed in each solar charging pole, solar charging station and rooftop solar project installation. The charging stations communicate regularly with the Solbank via the mobile network or an existing internet connection, giving the Solbank close to real-time information of when and where solar power is produced and used.
- Nov 2018Grant (prize money)$56.9K
- Jun 2018Grant (prize money)$58.3K
Funding & investor landscape
Notable founders
Market landscape — 10 sub-themes by coverage
Share of Energy Storage Tech coverage by sub-theme.
Regulatory-risk over time rising
Funding & growth over time
funding rising · growth rising
How research on Grid Energy Storage is moving in Sweden
A read on the academic research around Grid Energy Storage — which themes are gaining ground, the institutions and researchers driving them, and how the tone is shifting. Based on 409 Sweden-affiliated papers.
- Chalmers University of Technology94
- KTH Royal Institute of Technology91
- Uppsala University52
- Lund University30
- Luleå University of Technology22
- Battery (electricity)1→30
- Supercapacitor3→17
- Renewable energy1→13
- Capacitance2→12
- Anode1→10
- Renewable energy1→44
- Battery (electricity)2→43
- Automotive engineering1→17
- Electrode1→17
- Flexibility (engineering)1→13
- Battery (electricity)20
- Nanotechnology9
- Electrolyte7
- Flexibility (engineering)7
- Supercapacitor7
Where energy storage is researched across Sweden
Location clusters by institution affiliation — each city's volume, stance tone, and a quick read on its hot topic, what's advancing, the opening opportunity, and the main concern.
Common questions
Rohit lives in the feed. He covers what's moving right now — the funding rounds, launches and shifts breaking across the trade press — and ties them back to where the sector is heading.