FEI Monthly Roundup - May 2026

Welcome to our round-up of what’s been happening in fusion and within Fusion Energy Insights over the past month.

Top Fusion Energy News Stories

Focused Energy Raises $240 Million Series A to Advance Laser Fusion Development in Germany

Focused Energy has secured US $240m in Series A funding, led by a mix of strategic, public and existing investors including energy company RWE, the Federal Agency for Breakthrough Innovation, the European Innovation Council Fund and Prime Movers Lab.

The company plans to use the funding at the former RWE power plant site in Biblis, Hesse, where existing infrastructure and RWE's power plant experience can support its next phase of laser fusion development. Focused Energy is positioning the site as an industrial base for laser-driven fusion energy. The company is also anchoring its industrial implementation plans in Europe, with Germany at the centre of that strategy.

Helion Builds Tiny Merge Testbed as Sam Altman's Investment Stake Faces Scrutiny in Court

Helion Energy is building Tiny Merge, a smaller testbed machine designed to accelerate design iterations ahead of commercial plant operations. Tiny Merge is less than one-eighth the size of Polaris, Helion's seventh-generation prototype, and will first test plasma ring formation and merging. The move is notable because Polaris was previously positioned as Helion's final prototype before Orion, its first commercial plant, which is expected to supply Microsoft with fusion power within the next two years.

Separately, OpenAI CEO Sam Altman's stake in Helion, valued at about $1.65bn in late-2025 disclosures, is drawing scrutiny in the Musk v Altman trial and from the House Oversight Committee. Musk's case argues that Altman used his position at OpenAI to enrich himself through companies like Helion that are linked to OpenAI's strategic needs. The House Oversight Committee reports Altman suggested OpenAI invest $500 million in Helion, a move that would increase Helion's value six-fold, causing a potential conflict of interest due to Altman's stake in Helion. Altman says he recused himself from OpenAI's Helion dealings, citing his move earlier this year to step down from Helion's board, and argues Musk is ultimately looking to gain control of OpenAI.

Zap Energy Reaches US DOE Fusion Power Plant Preconceptual Design Milestone

The US Department of Energy (DOE) has approved Zap Energy's preconceptual design report milestone under the US Milestone-Based Fusion Development Program. The report describes Zap's Z-pinch fusion power plant concept, designed to generate around 50 MW of net electrical output per module. DOE's review covered major plant systems, including the liquid metal first wall and blanket, power supplies, power conversion, tritium fuel cycle, safety systems, remote handling and site infrastructure. Zap will submit a technical paper based on the milestone report later this year.

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Graph of the Month: Fusion Has Raised Billions. It Still Needs Hundreds of Billions More

This was our industry analysis “Graph of the Month” piece this time.

Every month, our industry experts at Fusion Advisory Services pick an interesting graph from the work that has been going on at FAS—something that gives some insight into significant trends, commercialisation considerations or fusion industry development.

Comparing Fusion Industry Funding with Future Capital Requirements

This month’s graph compares funds raised across magnetic fusion energy, inertial fusion energy and magneto-inertial fusion with the estimated capital required to construct upcoming fusion machines. No category has raised even a tenth of what is projected to be needed. But dig into the numbers and a more nuanced picture emerges.

FEI Premium subscribers can read the full article.

Recent Fusion Industry Events & Briefings

28th April: ITER's Knowledge Transfer Mechanisms, a hybrid session which took place at ITER during the Public-Private Fusion Workshop on April 28th.

20th May: Legal & Policy Briefing with Sidney Fowler, a Partner at Pillsbury Winthrop Shaw Pittman with his colleague, Clarence Tolliver.

Upcoming Fusion Energy Events

1st June: Quarterly Briefing with Sebastian Marx from European Fusion Association on EU Activity

1st July: Spark Sessions with Valerie Jamieson, Manager at Fusion Cluster, UK Atomic Energy Authority

Coming Soon: Fusion Energy Insights Quarterly

We will also be publishing the June edition of Fusion Energy Insights Quarterly in the coming weeks. Highlights include an Inside View feature on the New Mexico Innovation Hub in Santa Fe, an interview with Kieran Furlong, CEO of Realta Fusion, and the latest instalment of our Focus On series, exploring the evolving fusion landscape across the Middle East.