Skeleton Technologies

Skeleton Technologies is reported to have officially opened its €220 million SuperFactory in Markranstädt, near Leipzig, which is already delivering graphene-based supercapacitors to Siemens, General Electric and Hitachi Energy for European electrical grids, as well as to major US hyperscalers for AI infrastructure. The Leipzig plant is framed as a key hub in a fully European value chain, supplying high‑power, fast‑charging energy storage for AI data centers and grid‑stability projects as part of a broader energy‑transition and AI‑infrastructure strategy.

Notably, the road to full production has not been smooth. The factory had originally been planned to start production and ramp up in 2024, but equipment and supplier issues pushed completion of the final lines and full ramp‑up into 2025, prompting some public talk of Skeleton “failing to launch the plant in time,” even though the project itself was not cancelled. During this period Skeleton shut its older Dresden site and laid off staff in Estonia, which added to the perception problems, but the company now presents the Leipzig SuperFactory as opened, producing and delivering at scale

Skeleton Technologies and power supply solutions provider Acbel Polytech Inc. have jointly showcased an advanced AI Data Center Solution at the Open Compute Project (OCP) Global Summit 2025 in San Jose, California. The joint demonstration featured Skeleton's GrapheneGPU BBU, powered by Niobium SuperBattery technology, integrated with Acbel's power system to deliver enhanced backup power performance for modern data centers.

Li-ion batteries, used in data centers for backup power, do not have enough power for modern AI data centers, and are prone to fires and thermal runaway, creating safety risks. To solve this, Skeleton is launching a Niobium-based Battery Backup Unit, GrapheneGPU BBU.

Skeleton Technologies has launched GrapheneGPU, a high-performance system designed to solve the key challenge of AI growth: energy inefficiency and power infrastructure limitations. Skeleton’s proprietary Curved Graphene material reportedly reduces AI energy consumption by up to 45% and lowers power connection requirements by 44%, while boosting computing performance in FLOPS by 40%.

By cutting energy use and peak power demand nearly in half, these improvements could proportionally reduce both capital investments and operational costs in AI infrastructure. Skeleton stated that GrapheneGPU successfully completed validation under the most demanding power profiles set by leading hyperscalers. Initial shipments are scheduled from Skeleton’s German facility for June 2025. US manufacturing expansion is scheduled for the first quarter of 2026 to support growing international demand.

Skeleton Technologies recently closed a €108 million funding round that includes Siemens Financial Services (SFS), Marubeni Corporation and other investors. This funding will accelerate the development of next-generation products and finance the manufacturing expansion for supercapacitors and the company’s new high-power battery technology – the SuperBattery.

Skeleton Technologies’ CEO and Co-Founder, Taavi Madiberk, said: "Securing an investment from one of Europe's largest tech companies is a significant milestone for Skeleton. In addition to SFS’ investment, Siemens is also a key partner, supplier, and customer. Their expertise in industrialization and commercial partnerships will propel our growth and solidify our role in leading the energy transition”.

It was recently reported that Skeleton Technologies and the Canadian automotive supplier Martinrea International are cooperating to equip refuse collection vehicles for use in Paris and New York with Skeleton’s ‘SuperBattery’ technology.

Martinrea International develops and produces electric vehicle technologies for heavy-duty commercial vehicles through its subsidiary Effenco. The aim of the agreement with the Estonia-based Skeleton is to electrify fleets of refuse collection vehicles in Europe and North America, starting in New York City and Paris, and later to make the solution developed by both companies available worldwide. In autumn 2022, Shell had already become known as the first major customer for the graphene battery solution. Shell wants to use it to create electrification solutions for mining sites.

Skeleton Technologies has officially launched its SuperBattery, and unveiled Shell as its partner. Skeleton is joining a Shell-led consortium to offer electrification solutions for mining sites.

SuperBattery is an innovative technology combining the characteristics of supercapacitors and batteries. SuperBattery has been developed to serve the needs of several sectors and is currently being used and/or tested in hybrid and fuel cell EVs, buses, trucks, and charging infrastructure.

Skeleton Technologies has announced that it will supply its 'curved graphene'-enhanced supercapacitors to the metro units that Spanish manufacturer CAF will provide to the city of Granada, Spain.

Headquartered in Donostia - San Sebastian (Spain), the CAF Power & Automation has been working with Skeleton Technologies since last year. Following a successful tender, the Spanish manufacturer has been selected by the Metro de Granada to supply 8 new units for the city's network, which will be added to the 15 previously-delivered units which are
currently in service.

Estonia-based Skeleton Technologies has announced that it is building Europe’s largest supercapacitor production facility in Saxony with the support of Siemens. Skeleton Technologies is investing 220 million euros in the new production facility in Markranstädt, near Leipzig in Saxony.

According to the company, 100 million euros will be invested in production and 120 million euros in development and research as well as in a future ramp-up of production. In the future, 12 million supercapacitors are to be manufactured annually in Markranstädt. The start of production is planned for 2024.

Skeleton Technologies and ZPUE, the largest manufacturer of electrical devices for electrical power distribution utilities in Poland, have entered into a commercial agreement to provide energy storage solutions to the Polish market.

The two companies signed a Letter of Intent under which Skeleton should supply supercapacitors for rail wayside storage at 200 MW per year from 2023 to 2025.

Skeleton Technologies has announced its Round D3 with 37.6 million euros of equity investments. The Round was led by Taavet Hinrikus, from Taavet+Sten with Nidoco AB, EIT Innoenergy, Bengt Wahlqvist, co-founder of battery charging specialist CTEK, a group of founding team members of Adyen and others joining.

The investments will be aimed at further scale-up of supercapacitor production in Saxony, Germany, to meet customer demand and continuing the development of supercapacitor and curved graphene technology in new battery products.