Starlight Engine was established in April 2025 as a group company of Kyoto Fusioneering and is focused on advancing fusion energy through its FAST project. FAST is a privately led, industry–academia initiative that adopts a tokamak configuration and aims to demonstrate fusion power generation in the 2030s by generating and sustaining D–T burning plasma and demonstrating integrated power generation and fuel-cycle systems. The project has completed its conceptual design and is currently moving into engineering design and construction preparations. SLE is coordinating with leading fusion researchers and a wide set of private-sector partners and universities to develop the project and domestic supply chains. The company plans to use newly raised funds to accelerate engineering and technology development, site selection, regulatory processes, supply chain development, and organizational expansion. SLE intends to grow its headcount to about 200 employees over the next two years as it advances toward fusion power demonstration and future commercial plants.

Total raised

$37M

Funding rounds

1

Latest round

Equity

Latest activity

Jul 2026