Skeleton Technologies

Skeleton Technologies, founded in 2009 in Tallinn, Estonia, develops high-performance supercapacitors based on curved graphene, components capable of storing and releasing energy much faster than traditional batteries, used to stabilise electrical grids, integrate intermittent renewable sources, and support high power-density applications such as AI data centres. The company's funding path has accelerated notably in recent years: after a €108 million round with participation from Siemens Financial Services and Marubeni Corporation aimed at accelerating development of the SuperBattery — the company's new high-power battery technology — and financing manufacturing expansion, Skeleton Technologies announced in May 2026 the first close of a €33 million pre-IPO round, in preparation for a planned 2027 U.S. listing, with participation from Siemens Financial Services, Marubeni Corporation, FirstFloor Capital, and EIT InnoEnergy. On the industrial front, the company opened a €220 million plant in Leipzig, Germany in November 2025 — described as the world's largest supercapacitor manufacturing plant — designed to serve both the European electrical grid and growing demand from U.S. AI data centres. The company also opened a $60 million plant in Finland and is preparing manufacturing expansion into the United States. Skeleton Technologies positions itself in the high-power energy storage market, an increasingly strategic segment as AI-driven electricity demand grows at rates that strain grid stability, making supercapacitors a technology complementary to traditional batteries for applications requiring very fast charge and discharge cycles.