First Light Fusion secures £25m in inertial fusion energy funding from Starmaker One and UKAEA

First Light Fusion’s £25m funding round backs the next phase of inertial fusion energy development at its Oxfordshire facility

(Image courtesy of First Light Fusion)

First Light Fusion, the Oxford-based inertial fusion energy company, has closed the first tranche of its latest funding round at £25 million. The round was led by UK venture firm East X Ventures through its Starmaker One fusion fund, with a significant strategic investment from the UK Atomic Energy Authority (UKAEA) and continued backing from existing shareholders IP Group plc and its Hostplus managed fund. The capital will accelerate commercial development of the company’s FLARE Fusion Energy concept, which the company claims would deliver the highest energy gain of any fusion concept proposed so far, targeting a ratio of 1,000.

Inertial fusion energy funding backs FLARE’s high-gain approach

The FLARE concept represents a reactor-compatible approach to inertial fusion energy designed around a simpler, lower-cost pathway than conventional schemes. First Light describes the design as targeting an energy gain of 1,000, defined as energy released from the fusion reaction versus energy used to initiate it. The company positions this as the highest gain target of any approach proposed to date, though the figure reflects a design objective rather than a demonstrated result.

CEO Mark Thomas framed the close as momentum toward commercialisation at pace. “We are thrilled to welcome Starmaker One and UKAEA,” he said. “Together, their investments are a powerful validation of our technology and support our mission to move at pace towards commercially viable fusion energy.”

Theo Mollinger, General Partner of East X Ventures, cited the company’s dual-use technology and commercial planning as key factors in the decision. “We back pioneering companies which are national champions with dual use technologies and strong commercial plans,” he said, noting that First Light joins a growing portfolio through the Starmaker One fund, which Mollinger described as helping to build a vibrant fusion ecosystem in the UK.

UKAEA investment signals confidence in inertial fusion energy pathways

The UKAEA’s participation signals strong strategic interest in inertial fusion energy and underscores a broader effort to grow UK-based industrial capabilities in fusion. UKAEA CEO Tim Bestwick said the investment aligns directly with that strategy. “We are pleased to make this investment in First Light Fusion, which will support the company in developing their exciting, innovative technologies,” he said.

First Light’s commercial strategy runs alongside its research activity. The company points to recent experimental breakthroughs and expanding collaborations across academia, government, industry, and defence as foundations for the next phase of development. The funding is intended to push the company through a series of major fusion milestones while growing the commercial business built on its amplification technology and simulation capabilities.

Reactor Economics and the Case for Commercial Partnering

The round is structured as a first close, with further capital expected. For procurement specialists and supply chain stakeholders, the composition of investors matters as much as the headline figure. First Light makes a direct case for improved reactor economics relative to other inertial fusion schemes, describing FLARE as a simpler, lower-cost pathway enabled through a commercial partnering strategy. In its separately published FLARE white paper, the company states the approach has the potential to leverage existing supply chains and proven technologies, which it argues reduces capital expenditure and lowers barriers to deployment.

The announcement reinforces the UK’s positioning as a hub for alternative fusion pathways and points toward a next phase in which First Light will target defined technical milestones on the road to scalable, commercially viable fusion power.

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