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Inertia Enterprises—Inertia opens 50,000 sq ft Livermore headquarters for fusion laser and target manufacturingThunderwallInertia Enterprises—Inertia Enterprises raises $450 million Series A for grid-scale fusion laser

Inertia Enterprises

Thunderwall laser fusion, grid-scale fusion electricity

USprivateest. 2025Checked 11 Oct

The brief

Analyst view
  • $450M Series A (Feb 2026), largest laser-fusion raise.
  • Building Thunderwall: 10 kJ laser at 10 Hz, 10% efficiency.
  • Goal: pilot plant to commercial 1 GW plant in a decade.

Technical approach

As reported
Fuel compression

Laser compresses fuel to fusion conditions

Laser pulses compress fuel pellets to extreme densities and temperatures, triggering reactions. Proven by NIF fusion ignition in Dec 2022.

Laser design

Thunderwall semiconductor diode laser

Semiconductor diode-pumped fusion laser: 10 kJ at 10 Hz, 10% efficiency—50x prior laser power.

Target manufacturing

Fusion fuel target production line

Building dedicated target production to mass-manufacture fusion pellets for frequent commercial shots.

Scaling path

Modular beamline architecture

1,000–4,000 independent Thunderwall beamlines reach 10+ MJ output per shot.

Primer