What Skeleton Technologies does

Skeleton Technologies is an Estonian-founded ultracapacitor and energy storage manufacturer established in 2009 and headquartered in Tallinn, with operating subsidiaries in Germany (Skeleton Technologies GmbH) and Finland (Skeleton Technologies Oy). Its competitive foundation is a proprietary Curved Graphene material—an inorganic pre-cursor enabling lower internal resistance and higher capacitance than the organic carbon-based materials used by competitors—that underpins three product families: SkelCap ultracapacitor cells (D33/D60 form factors, 1M+ cycle life), SuperBattery high-power batteries (50,000 cycle life, up to 120C power performance), and integrated power systems for AI data centers (GrapheneUPS, GrapheneGPU, GrapheneBBU). The product portfolio spans rack-to-grid energy storage for hyperscaler AI infrastructure, grid-scale E-STATCOM systems, defense power systems, marine active heave compensation, rail KERS, automotive 12V boardnet stabilization, heavy-equipment engine starting (SkelStart), mining haul-truck fast charging, and bus fleet electrification.

The company manufactures at scale through the €220 million Leipzig SuperFactory in Germany—claimed as the world's largest dedicated supercapacitor plant—and the €50 million Varkaus SuperBattery facility in Finland (1 GW annual capacity), supported by curved-graphene synthesis in Bitterfeld-Wolfen and a new Houston manufacturing site opened in 2026. Technology is protected by roughly 70 patent families, with additional marine-specific and SuperBattery filings, and qualified across IATF 16949 (automotive), ISO 9001/14001, EMAS, EN 50155 rail, and DNV-GL marine certifications. Revenue is generated through quote-based enterprise B2B sales and multi-year OEM supply contracts directly to major industrial customers—Siemens, GE, Hitachi Energy, BMW, Honda, Volvo, Škoda, CAF, Danfoss, Shell, and ESA—alongside direct sales to utilities and AI infrastructure operators, supplemented by a global distributor network. Cumulative venture funding is approximately €392 million as of May 2026 across rounds backed by Siemens, Marubeni, Taavet Hinrikus, EIT InnoEnergy, the EU Innovation Fund, Harju Elekter, the Free State of Saxony, and BMWi; the company is preparing for a US IPO targeted for 2027.

Name

Skeleton Technologies

Legal name

Skeleton Technologies GmbH

Website

http://www.skeletontech.com

Company type

Private

Founded year

2009

Operating status

Operating

Headcount range

251–500 employees

Short description

Skeleton Technologies is an Estonian-founded manufacturer of Curved Graphene–based ultracapacitors, SuperBattery cells, and integrated power systems serving AI data center operators, grid utilities, defense, and industrial transportation customers across Europe, North America, and Asia.

Ownership category

akta.pro rank

Product category

Energy Storage Systems

NAICS

Relay and Industrial Control Manufacturing (335314), Carbon and Graphite Product Manufacturing (335991)

SIC

Electronic & Other Electrical Equipment (No Computer Equip) (3600)

akta.pro primary industry

Power Quality, Metering & Monitoring (HDACAJAG)

akta.pro secondary industries

Energy Storage Software & Controls (EMS, monitoring, optimization, cybersecurity) (IMAGAHAJ), Solid-State Battery Materials & Cell Manufacturing (EUAFABAH)

Keywords

• Ultracapacitor energy storage
• Supercapacitor manufacturing
• AI data center power
• Grid energy storage
• Industrial battery solutions

Headquarters

HQ city

Tallinn

HQ country

Estonia

HQ region

Europe

Offices6 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Supply Chain, Operations, Technology or R&D, Personnel, Infrastructure, Marketing or Sales

Revenue model

1. Supercapacitor Modules and Cells: Sale of SkelCap ultracapacitor cells (D33, D60 formats) and modules for industrial, transportation, and energy storage applications. Revenue from direct hardware sales to OEMs and end customers.
2. Power Systems (UPS, GPU, BBU): Sale of integrated power systems for AI data centers including GrapheneUPS, GrapheneGPU, and GrapheneBBU products. Full value chain engineering and production from IT rack to electrical grid.
3. SuperBattery Products: Sale of SuperBattery energy storage products for applications including marine, mining, grid balancing, and data center backup power. Designed for 50,000 life cycles with high power performance.
4. Grid-Scale Energy Storage Systems: High-power, long lifetime grid-scale energy storage systems for E-STATCOM and data center applications. Includes cabinet systems with max power up to 2830 kW.
5. Engine Start Modules (SkelStart): Sale of ultracapacitor-based engine start modules for trucks, buses, rail, and heavy equipment applications. Provides reliable starting in extreme weather conditions.

Pricing tiers

Go-to-market motion1 record

Distribution channels4 records

Marketing channels8 records

Core offering

Skeleton Technologies manufactures high-power energy storage hardware based on proprietary Curved Graphene material, including ultracapacitor cells and modules (SkelCap D33/D60), SuperBattery products, and integrated power systems for AI data centers (GrapheneUPS, GrapheneGPU, GrapheneBBU), grid stabilization (high-power systems for E-STATCOM), and engine starting (SkelStart). The company produces these at large-scale factories in Germany (Leipzig SuperFactory) and Finland (Varkaus SuperBattery plant) and sells them directly to OEMs, utilities, hyperscalers, defense, and industrial customers.

Product overview

Skeleton Technologies is a power systems provider for AI infrastructure, offering the only complete portfolio of power systems from the IT rack to the electrical grid. The product lineup centers on three main AI data center solutions: GrapheneUPS (double-conversion UPS for AI infrastructure), GrapheneGPU (peak load shaving for AI/GPU computing), and GrapheneBBU (battery backup based on SuperBattery technology). Supporting these core products are High-power Systems (grid-scale energy storage for E-STATCOM) and High-power Modules (supercapacitor modules). The company also produces SkelCap ultracapacitor cells (D60 and D33 form factors) and SuperBattery technology as foundational energy storage components. Additional offerings include SkelStart engine start modules and solutions across Grid Stability, Defense, Automotive, Heavy Transportation, Buses, Mining, Marine, and Rail verticals.

Differentiator

Problem solved

Functional benefit

Brands

• GrapheneUPS: High-density double-conversion UPS system designed for AI data centers with graphene-enhanced supercapacitor storage
• GrapheneGPU
• GrapheneBBU
• SuperBattery
• SkelCap
• SkelStart
• Leipzig SuperFactory
• Curved Graphene

Products and services

• GrapheneUPS Double-conversion UPS system built specifically for AI data centers. Handles highly dynamic GPU workloads, delivering clean, stable power and protecting critical infrastructure from grid disturbances. Industry-leading UPS density with up to 50% lower footprint vs competition.
• GrapheneGPU AI peak load shaving solution that delivers power when GPUs compute and charges when GPUs are idle. Maintains smooth power demand from the grid, eliminating the need for artificial compute loads and unlocking higher compute capacity. 48-400 VDC interface voltage, 60-160 kW peak power, 10 µs dynamic reaction speed.
• GrapheneBBU Battery Backup Unit for data center backup power based on Skeleton's SuperBattery energy storage technology. Features integrated DC/DC converter and battery management system, 400 VDC interface, liquid cooling, and up to 90 seconds backup duration with 97% peak efficiency.
• SkelCap D60 Supercapacitors Ultracapacitor cells in D60 form factor with up to 3400 farads output, specific power up to 80 kW/kg, specific energy up to 11.1 Wh/kg, more than 1 million charge cycles, and 20+ year application lifetime. Operating temperature range -40°C to +65°C.
• SkelCap D33 Supercapacitors Ultracapacitor cells in D33 form factor for data center and automotive applications. Industry-leading performance with low ESR based on Curved Graphene material.
• SuperBattery Fast-charging, high power battery technology that combines supercapacitor and battery characteristics. Designed for 50,000 life cycles with excellent safety, up to 120C maximum power and energy performance. Built for applications requiring 60 seconds to 45 minutes charge/discharge cycles, including marine, mining, grid balancing, and AI data center backup power.
• SkelStart Engine Start Module Ultracapacitor-based engine starting module for large diesel engines in trucks, buses, rail, mining equipment, and other heavy-duty vehicles. Available in 12V/2133 CCA and 24V/1206 CCA. Fully charged in 19 minutes. Operating temperature -40°C to +65°C with vibration and shock resistance.
• High-power Systems Grid-scale high-power energy storage systems for E-STATCOM and data center applications. Cabinet systems with max power up to 2830 kW and nominal voltage up to 1500V, designed for long-lifetime grid stabilization and frequency regulation.
• High-power Modules Configured supercapacitor modules for industrial, transportation, energy storage systems, and grid stability applications. Sold as integrated modules rather than bare cells, including SkelMod 51V variants certified to rail standards (EN 50155, EN 50121-3-2, EN 50124-1, EN 50125-1, EN 60077-1, EN 61373).

Quantifiable outcome

• 40% reduction in AI data center energy consumption
• +10 more outcomes

Named customers14 records

Segments9 records

Ideal customer profiles4 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature7 records

Partnerships

Nine partnerships are on record, tiered core and minor.

• KNDS FrancecoreStrategic or Co-development Partner · 16 June 2026Joint Declaration signed to strengthen cooperation on advanced military vehicle platforms for demands of modern battlefields. Exploring new areas of collaboration.
• TEKEVERcoreStrategic or Co-development Partner · 16 June 2026MoU signed at Eurosatory 2026 to strengthen Europe's defence technology and aerospace innovation. Focus on UK, France, Estonia and NATO's Eastern flank.
• Hyosung Heavy IndustriescoreStrategic or Co-development Partner · 21 February 2026Strategic MoU signed to develop South Korea's first domestically produced next-generation e-STATCOM grid stabilization solution. Commercialization targeted for 2027.
• Marubeni CorporationcoreStrategic or Co-development Partner · 21 February 2026Strategic MoU with Hyosung Heavy Industries and Marubeni to develop e-STATCOM solution for South Korea grid stabilization.
• Hitachi EnergycoreOEM/ Whitelabel/ Licensing Partner · 28 November 2025Major customer receiving graphene-based supercapacitors for European electrical grids. Long-term supply partnership.
• General Electric (GE)coreOEM/ Whitelabel/ Licensing PartnerCustomer receiving graphene-based supercapacitors for European electrical grids. Long-term supply partnership.
• MJR Power and AutomationcoreStrategic or Co-development PartnerLong-standing cooperation on marine applications. First supercapacitor system globally DNV-GL certified for pipelay failure ride-through. Active heave compensation systems and offshore projects.
• IMECA/REELminorStrategic or Co-development PartnerMarine-certified supercapacitor development for active heave compensation systems. French company specializing in lifting equipment for nuclear, aerospace, defence, and hydropower industries.
• European Space Agency (ESA)minorStrategic or Co-development PartnerResearch and development projects in energy storage technology.

Scale indicators14 records

Recent moves10 records

Expansion highlights6 records

Emerging players

• Yunasko: Ukrainian supercapacitor and energy storage company developing high-power cells for industrial and transportation applications. Direct competitor in cell technology, though smaller scale and operating from a different geography.

Broad incumbents

• ABB: Power and automation incumbent offering grid-scale energy storage, UPS, and industrial power systems. Competes with Skeleton in grid stability (E-STATCOM equivalent) and data center power, but as part of a much wider portfolio.
• Eaton: Global power management company with supercapacitor modules and UPS systems. Overlaps with Skeleton in UPS for data centers and industrial power quality, but offers a much broader electrical portfolio.
• Tesla Energy: Tesla's energy generation and storage arm (Powerwall, Megapack, Solar Roof). Competes with Skeleton in AI data center backup (Powerpack/Megapack) and grid-scale storage, with vastly larger scale and vertical integration.
• Schneider Electric: Global energy management and automation company offering UPS systems, power distribution, and data center infrastructure. Competes with Skeleton's GrapheneUPS in AI/hyperscale data centers, with much broader scope.

Direct peers

• Maxwell Technologies (Tesla): Ultracapacitor manufacturer acquired by Tesla in 2019. Most direct competitor to Skeleton in supercapacitor cells and modules, serving automotive, grid, and industrial applications with similar form factors and use cases.
• Fluence Energy: Grid-scale energy storage systems provider (Siemens-AES JV spin-off). Direct competitor in utility-scale battery storage and grid stabilization, serving similar utility customers with hardware + software offerings.
• Ioxus: US-based ultracapacitor manufacturer producing cells and modules for transportation, grid, and industrial markets. Direct product overlap with Skeleton's SkelCap line, though smaller in scale.
• CAP-XX: Australian thin-form-factor supercapacitor manufacturer for IoT, wearables, and industrial applications. Competes in the supercapacitor cell market but focuses on smaller prismatic formats rather than Skeleton's high-power D60 cells.
• LS Materials: Korean ultracapacitor manufacturer (subsidiary of LS Group). Competes directly with Skeleton in cells/modules for automotive, rail, and grid applications, especially in Asian markets where Skeleton is now expanding via Hyosung partnership.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

• Xx.com/skel_tech
• YouTubeyoutube.com/channel/UC6LTIsCZ_zx8nJQg8gW_VlA
• Facebookfacebook.com/skeletontech
• LinkedInlinkedin.com/company/skeleton-technologies-ltd-
• Instagraminstagram.com/skeletontechnologies

Compliance6 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles5 records

Subsidiaries2 records

Funding overview

Funding rounds14 records

Investors21 records

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments1 record

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Skeleton Technologies