Siemens Leads 9-Figure Skeleton Round at a $1B+ Valuation

Skeleton Technologies said on 14 October 2026 that it has received a strategic investment from Siemens that brings its valuation to more than $1 billion. Its chief executive, Taavi Madiberk, calls it a “9-digit investment round led by Siemens”.

The release says the money will primarily accelerate the expansion of Skeleton’s US manufacturing and its R&D in Silicon Valley, to meet demand from hyperscalers for power systems in AI data centers. It does not state the size of the round or Siemens’ stake.

The Money Terms

The release gives two figures for the deal itself: a valuation of more than $1 billion, and a round that Madiberk calls nine-digit. By our reading of “9-digit”, that is at least $100 million; the release does not give the exact amount or name other investors.

As we read it, the pitch sits alongside other recent deals on power for AI data centers and the wider AI data-center build-out, which also start from limited grid capacity.

Separately, Skeleton says it plans to invest more than $200 million in operational scale-up and R&D in Silicon Valley, working directly with hyperscalers. The US expansion includes plans to establish domestic cell manufacturing, which the release says would create a fully integrated US value chain from cells to complete systems.

The release describes the investment as deepening a long-standing relationship: Siemens supported Skeleton’s expansion in 2023, and Siemens Digital Industries designed and automated the company’s Leipzig SuperFactory in Germany.

What Skeleton Sells to AI Data Centers

The release says GPU clusters can shift between power states in milliseconds, creating rapid load swings, peaks and harmonics. Skeleton says its high-power systems manage those fluctuations close to the workload, and it claims up to 40% energy savings and double-digit improvements in GPU performance. Those are the company’s figures.

The core of the technology, according to the release, is a proprietary Curved Graphene material engineered for fast power delivery, high efficiency and long cell life, combined with power electronics and system-level controls.

To frame demand, the release cites the International Energy Agency: global data-center electricity use rising from around 485 TWh in 2025 to 950 TWh by 2030, electricity use by AI-focused data centers tripling, and US data centers accounting for around half of electricity-demand growth through 2030.

What the Two Companies Say

Madiberk’s pitch is about output per megawatt: “AI is scaling faster than the power infrastructure behind it. The constraint is not how many GPUs you can buy, but how much compute you can extract from every GPU and every megawatt available.” He adds: “In AI infrastructure, supercapacitors are becoming the new semiconductors.”

For Siemens, Markus Grabmeier, President of Electrical Products at Siemens AG, says: “Skeleton’s portfolio perfectly complements Siemens’ comprehensive data center offering.” The release says the companies will combine Siemens’ industrial electrical infrastructure with Skeleton’s fast-response power systems to develop and commercialize products for next-generation AI data centers.

The Structural Read

As we read it, the money is aimed at the US: the release says it will primarily expand Skeleton’s US manufacturing and Silicon Valley R&D, with more than $200 million of planned US scale-up and domestic cell manufacturing.

As we read it, the investment deepens an existing relationship: the release says Siemens supported Skeleton’s expansion in 2023 and Siemens Digital Industries designed and automated the Leipzig SuperFactory.

As we read it, the case rests on Skeleton’s own performance claims: up to 40% energy savings and double-digit GPU performance improvements, which the release states without independent measurements.

Three Implications

HYPERSCALERS The release says the partnership targets hyperscaler demand “from the grid to the rack” and brings Skeleton’s manufacturing closer to its largest AI infrastructure customers in the United States, none of whom it names.

DATA-CENTER POWER SUPPLIERS The release says the companies will combine Siemens’ industrial electrical infrastructure with Skeleton’s fast-response power systems to develop and commercialize products for next-generation AI data centers.

SKELETON’S INVESTORS The release states the valuation as more than $1 billion but not the round size or Siemens’ stake, so the dilution and terms are not disclosed.

The Business Engineer Lens

This story maps onto the Business Engineer framework The State of AI Data Centers.

The framework puts it this way: “a projected 19GW gap between new data center demand and available grid capacity threatens to deflate the AI bubble.”

As we read it, Skeleton pitches the other side of that gap: rather than adding grid capacity, it says its systems get more compute out of the megawatts already available, and Siemens has now put money behind that claim.

What Is Not Established

The release does not state the amount Siemens invested, the size of its stake, the other participants in the round, the location or timing of the planned US cell manufacturing, or any named hyperscaler customer. The energy-savings and GPU-performance figures are Skeleton’s own claims, and we have not seen independent measurements. Bloomberg reported the deal the same day; we did not read its article and have not used it.

The Bottom Line

Skeleton’s release says a nine-digit round led by Siemens values the company at more than $1 billion, and that it plans to put more than $200 million into US scale-up and R&D to build a US value chain from cells to systems for hyperscalers’ AI data centers.