Siemens has made a further undisclosed investment in supercapacitor firm Skeleton Technologies as part of a new ‘exclusive partnership’ for the German industrial group to expand in the AI factories sector.

Under the partnership, announced on October 14, Siemens will have exclusivity in selling and scaling Skeleton’s products in the data centre market.

Siemens has been involved with Skeleton as a tech partner since 2022 and as an investor from 2023.

Strengthening their relationship will support an expansion of Siemens’ services from grid connection to AI racks — specialised server racks designed to support high-performance computing.

New services offered under the agreement will resolve a key constraint on the expansion of data centres — the massive, rapid and recurring swings in electricity demand, the partners said.

AI workloads synchronise thousands of powerful chips, whose power demand can rise or fall within milliseconds and aggregate into swings at megawatt scale in seconds. 

Skeleton said its supercapacitors solve this challenge by absorbing rapid power swings, protecting valuable equipment and the grid while helping operators increase processing capacity and limiting the need for costly and time-consuming upgrades to existing facilities.

Peter Koerte, a member of Siemens managing board and the group’s president of smart infrastructure, said the race to scale AI is increasingly becoming a race for power.

“By combining Siemens’ electrical infrastructure expertise with Skeleton’s breakthrough supercapacitor technology, we can help customers unlock more AI capacity, improve resilience and accelerate growth in a rapidly expanding market.”

Skeleton CEO and co-founder Taavi Madiberk said: “This winning combination gives us the strongest value proposition in the AI power infrastructure market, and we plan to become the world’s largest provider of white-space power systems for AI data centres.”

Skeleton announced last year that proprietary new ‘curved graphene’ tech had the ability to reduce data centres’ AI energy consumption by up to 45%, tackling a key challenge for expansion of AI systems.

The firm has said previously its supercapacitors use no lithium, cobalt, manganese, or other critical raw materials, and are based on its tech.

Batteries International reported in November 2025 on Skeleton’s formal opening of its €50 million ($58 million) SuperBattery factory in Finland. The firm said the plant, with a 1GW annual capacity, was Europe’s first producing high-power batteries for AI data centres.