Inertia Enterprises raises $450 million Series A for grid-scale fusion laser

Inertia Enterprises/Thunderwall

Inertia announced $450M Series A led by Bessemer Venture Partners. Funding supports Thunderwall laser development and target manufacturing toward a pilot power plant.

• Largest laser-fusion raise to date.
• Led by Bessemer; participated by GV, Modern Capital, Threshold Ventures.
• Funds Thunderwall laser and target production.
• Co-founders: Lawson (ex-Twilio), Kritcher (NIF designer), Dunne (SLAC director).