VANCOUVER, BC — June 22, 2026 — General Fusion announced today it has successfully tripled the temperature of its plasma to over 8.4 million degrees Celsius using its prototype compression system, a key validation of the company's unique approach to fusion energy. The result, achieved on the LM26 machine at its Canadian headquarters, demonstrates that mechanical compression alone can effectively heat a magnetized plasma. This milestone is a critical step toward achieving the 100 million-degree temperatures required for commercial fusion power.

The experiment heated the plasma's electrons to an estimated 0.72 kiloelectron-volts (keV), a significant jump from previous levels. General Fusion's Magnetized Target Fusion (MTF) technology first creates a stable, self-contained plasma called a spheromak. This plasma is then injected into a chamber where a vortex of liquid metal is rapidly compressed by an array of powerful pistons, squeezing the plasma to fusion pressures and temperatures.

The experiment heated the plasma's electrons to an estimated 0.72 kiloelectron-volts (keV), a significant jump from previous levels.

This achievement on the LM26 machine is specifically designed to de-risk the compression subsystem for the company's planned fusion demonstration plant. The prototype uses 14 pistons to drive the collapse of a liquid metal liner, proving the system can operate with the precision and power needed. The company is targeting a temperature of 1 keV, a threshold considered crucial for demonstrating the viability of compressional heating for its larger-scale machine.

General Fusion's approach differs significantly from the tokamak and stellarator designs pursued by many other public and private fusion efforts, which rely on massive superconducting magnets for plasma confinement. By combining magnetic confinement with mechanical compression, the company aims to create a more practical and cost-effective path to a fusion power plant. The liquid metal liner also serves to protect the reactor walls and breed tritium fuel, addressing two major challenges in fusion reactor design.

The company, backed by a global syndicate of investors including Bezos Expeditions and Temasek, has raised hundreds of millions in private capital alongside government support. This funding has enabled the development of its Vancouver facility and underpins its plans for a full-scale demonstration plant. The successful compression test provides crucial data that will inform the final design and construction of that next-generation machine.

While a significant scientific step, the 0.72 keV result remains far from the approximately 10 keV needed for net energy gain. The company must still integrate this proven compression system with a high-performance plasma injector and scale the entire system to achieve fusion conditions. The next phase will involve refining both the compression and plasma formation technologies to work in concert and push temperatures closer to the commercial target.

With this validation of its core heating mechanism, General Fusion will now focus on integrating its advanced plasma injectors with the compression technology. The company is expected to make a final decision on the location and construction timeline for its full-scale demonstrator plant within the next 18 months. The performance of that future machine will determine if the MTF approach can ultimately deliver on its promise of clean, abundant energy.