First Light Fusion publishes first plausible path to high gain, unlocking cheap fusion energy – 19 September, 2025
• First Light Fusion has presented the first reactor-compatible path to “high gain” fusion, which would drastically reduce the cost of this limitless clean energy source.
• Gain (energy out divided by energy in – the efficiency of the fusion reaction) is *the* critical parameter in determining the cost of fusion energy.
• Models show that the company’s new concept for high gain fusion – called FLARE – could potentially access an extraordinary gain of 1,000, compared to today’s experimental level of 4 and an order of magnitude higher than other proposed inertial fusion energy (IFE) schemes.
• First Light has published a detailed white paper outlining its amplification technology and a new, complementary power plant approach – with the paper having been strongly endorsed by renowned physicists.