Startup · Estonia
Skeleton Technologies
HQ Tallinn, EstoniaFounded 2009201-500 employeesUpdated
Develops power systems for data centers, grids and transportation, including supercapacitors and SuperBattery energy storage.
Funding10 rounds · ~$294M
- Equity raised
- ~$294M
- Debt, secondaries & grants
- ~$76.6M
- Latest
- ~$38.5MStage undisclosed · May 8, 2026
| Announced | Stage | Amount | Valuation | Lead investors | Other investors | Confidence |
|---|---|---|---|---|---|---|
| May 8, 2026 | Undisclosed | ~$38.5M | — | — | — | Reported |
| Oct 13, 2023 | Debt | Undisclosed | — | — | — | Reported |
| Oct 13, 2023 | Series E+ | ~$114M | — | — | — | Reported |
| Jan 28, 2022 | Series D | ~$42.5M | — | — | — | Reported |
| Jun 30, 2021 | Series D | ~$34.9M | — | — | — | Reported |
| Mar 11, 2021 | Grant | ~$60.7M | — | — | — | Reported |
| Nov 3, 2020 | Series D | ~$48.9M | — | — | — | Reported |
| Apr 24, 2017 | Grant | Undisclosed | — | — | — | Reported |
| Feb 10, 2017 | Debt | ~$16.0M | — | — | — | Reported |
| Aug 3, 2016 | Series C | ~$14.6M | — | — | — | Reported |
- Undisclosed~$38.5MMay 8, 2026
- DebtUndisclosedOct 13, 2023
- Series E+~$114MOct 13, 2023
- Series D~$42.5MJan 28, 2022
- Series D~$34.9MJun 30, 2021
- Grant~$60.7MMar 11, 2021
- Series D~$48.9MNov 3, 2020
- GrantUndisclosedApr 24, 2017
- Debt~$16.0MFeb 10, 2017
- Series C~$14.6MAug 3, 2016
Raised counts equity rounds; debt, secondary sales and grants are totaled separately. Amounts in other currencies are converted at the announcement month's average rate. A ~ marks an estimated or converted amount.
Systems8
- 162V62F ModuleSupercapacitor module designed for grid-stability applications.
- GrapheneBBU ModuleBattery backup module for data centers using Skeleton SuperBattery energy-storage technology.
- GrapheneBBU RackRack-mounted battery backup system for data centers.
- GrapheneCBU 800Capacitor bank unit for power smoothing in AI data centers.
- GrapheneGPU PCS50Capacitor shelf for power smoothing and peak-load management in AI data centers.
- GrapheneStartSupercapacitor-based engine-start module for diesel vehicles.
Newest unveiled first. Systems that belong to a government program link to the program page, where variants, costs and contracts are.
Capabilities1
| Technology | Role | Maturity | TRL | Notes | Confidence |
|---|---|---|---|---|---|
| Power, grids and energy storage | Developer | — | — | classify_sectors run 37, haiku, taxonomy 2026-10-18b: Develops supercapacitor and SuperBattery energy storage and power systems for data centers, grids and transport; no defense use is stated. | Reported |
- Developerclassify_sectors run 37, haiku, taxonomy 2026-10-18b: Develops supercapacitor and SuperBattery energy storage and power systems for data centers, grids and transport; no defense use is stated.—Reported
Maturity and TRL describe this organization's work; the field-wide maturity is on each technology's page.
People1
| Person | Role |
|---|---|
| Taavi Madiberk | CEO & Member of the Board |
Sources8
Profile1
- 1DatabaseSkeleton Technologies — Energy, Power & Sustainment Systems Startup in Estonia | Sixth-Domain
Sixth-Domain · Supports Organization · kind
“Skeleton Technologies — Energy, Power & Sustainment Systems Startup in Estonia | Sixth-Domain”
Systems6
- 2
Skeleton Technologies · Supports Organization, System
“The only full provider of power systems from the IT rack to the electrical grid: CBU and BBU sidecars, double-conversion UPS, and power support for SST”
- 3
Skeleton Technologies · Supports System
“Supercapacitor-based GrapheneStart is an engine start module capable of providing cold-cranking power up to 2kA to start large diesel engines.”
- 4
Skeleton Technologies · Supports System
“SkelGrid is an energy storage system that can be used for short-term backup power or to increase power quality for industrial applications or infrastructure. As a modular system, SkelGrid components can be customized according to the customers' needs.”
- 5
Skeleton Technologies · Supports System
“GrapheneBBU Module Battery Backup Unit (BBU) for data center backup power, based on Skeleton’s proprietary SuperBattery energy storage technology. - Integrated DC/DC converter and battery management system (BMS) - 800 VDC interface voltage - Liquid-cooled”
- 6
Skeleton Technologies · Supports System
“GrapheneGPU PCS50 GrapheneCBU 800 ### Unlock Your GPUs' Full Potential GrapheneGPU delivers power when GPUs compute, and charges when GPUs are idle. Maintaining a smooth power demand from the grid, and eliminating the need for dummy loads. + Peak Shaving Capacitor Shelf (PCS) + 48 VDC interface voltage + 60 kW peak power + ORV3 compatible, 1OU high + Air-cooled and liquid-cooled options available + Intelligent control and integrated BMS + Supercapacitor energy storage based on Skeleton's patented Curved Graphene technology  ”
- 7
Skeleton Technologies · Supports System
“Built for grid stability applications, the 162V62F module is a supercapacitor based modules designed for longevity, reliability, high performance and ease of integration.”
Funding1
- 8
Octen Business Search · Supports Funding round, Organization · country, Organization · employee range, Organization · founded year, Organization · hq city, Organization · hq region, Organization · linkedin url, Organization · ownership, Role
“funding round: Series E, 2023-10-13, EUR 108,000,000, lead: Marubeni;Siemens Financial Services”
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