First Light Fusion has secured £25m in the first close of a new funding round, supporting the development of next-generation fusion technology aimed at delivering low-carbon energy.

The investment, led by East X Ventures through its Starmaker One fund, includes backing from the UK Atomic Energy Authority (UKAEA) and existing investors, reinforcing confidence in the UK’s fusion sector.

Fusion energy has the potential to provide abundant, low-emission electricity, playing a key role in long-term decarbonisation and energy security.

The funding will accelerate development of First Light Fusion’s FLARE concept, a novel approach to inertial fusion designed to achieve high energy output with lower system complexity.

By advancing scalable fusion technologies, the company aims to reduce reliance on fossil fuels and support a sustainable energy transition.

Mark Thomas, First Light Fusion, CEO said: “We are thrilled to welcome Starmaker One and UKAEA. Together, their investments are a powerful validation of our technology and support our mission to move at pace towards commercially viable fusion energy.”

The participation of UKAEA highlights growing national support for diversifying fusion technologies and strengthening domestic capability in clean energy innovation.

Tim Bestwick, CEO, UKAEA said: “As described in the recent UKAEA strategy, we are looking to grow UK based industrial capabilities in fusion. We are pleased to make this investment in First Light Fusion, which will support the company in developing their exciting, innovative technologies.”

The development underscores the UK’s ambition to lead in clean energy innovation while advancing solutions to reduce global emissions.