A Fusion Startup Just Passed a Big Test. Here's What It Means

Zap Energy, a company based in Washington state, has successfully run more than 100 experiments with its fusion reactor. The milestone marks real progress toward building a working fusion power plant. The company uses a design called a Z-pinch to try to recreate the energy of the sun in a controlled way.

How Z-Pinch Fusion Works

Most fusion research focuses on a design called a tokamak. Zap Energy is taking a different route with something called a Z-pinch.

Think of it this way: imagine trying to squeeze a column of gas so tightly that its atoms fuse together and release energy. In a Z-pinch, you use electricity running through the gas to create a magnetic field that squeezes it from all sides. The gas itself becomes the source of the magnetic squeeze, rather than needing separate magnets around it.

Zap's innovation is using something called "sheared-flow stabilization"—essentially, moving the gas at different speeds at different layers to keep it stable. Without this, the squeezed column tends to wriggle and collapse, like a pinched water stream losing its shape.

The entire fusion process happens in less than one millisecond—a thousandth of a second—inside a cylinder about 10 feet long. This speed requires extremely precise timing and control systems.

Zap operates two experimental devices: the FuZE and the newer FuZE-Q. Both are used to test and refine how the Z-pinch approach performs.

Where the Idea Came From

The underlying science grew out of research at the University of Washington two decades ago, led by Uri Shumlak. He studied how moving plasma flows could keep a Z-pinch stable instead of letting it fall apart.

I've covered fusion research for decades, and I've watched researchers tackle the same core problem over and over: plasma wants to become unstable. Every generation finds new ways to control it. Zap's approach goes back to simpler magnetic designs but combines them with modern computers and control systems that simply didn't exist in earlier fusion attempts.

Why 100 Shots Matter

For fusion researchers, the ability to run experiments repeatedly and reliably is crucial. Each shot lets them measure temperatures, densities, and how long the plasma stays confined. It also shows whether results are consistent shot to shot, which is essential for making improvements.

Z-pinch systems have another advantage: they can be cycled quickly. Because the whole process takes a fraction of a millisecond, you can run another experiment almost immediately. Compare that to some other fusion designs that need hours between attempts while equipment cools down.

The Bigger Picture

Zap Energy is led by CEO and co-founder Benj Conway since 2017. The company is one of many private fusion ventures exploring different approaches. Commonwealth Fusion Systems is building high-powered tokamaks. TAE Technologies is testing a different magnetic design. Helion Energy is using a pulsed approach.

The fusion industry is essentially hedging its bets by funding multiple technical pathways at once. Large government projects like ITER continue pursuing tokamak designs, while private companies try alternatives that might reach commercial power faster.

Z-pinch systems could be simpler to build than tokamaks—you don't need massive external magnets and the engineering is less complex. But any fusion approach, including Z-pinch, still needs to achieve one hard goal: producing more energy than it consumes. That requires hotter plasma, denser plasma, and keeping it confined long enough—all at the same time.

What Comes Next

The 100-shot milestone puts Zap Energy in position for the next phase: optimizing the design. The researchers will work on extending how long the plasma stays confined, raising temperatures and density, and making the experiments more consistent shot to shot.

The real test ahead is far harder than hitting 100 shots. Moving from experimental success to a working power plant requires not just better plasma performance, but engineering solutions for handling tritium fuel, extracting heat, and converting it to electricity.

The fusion industry is still exploring which approach will win out in the real world. Zap Energy's progress with Z-pinch is one more piece of evidence in a larger question that won't be settled for years: which of these alternative fusion designs will be the first to actually generate commercial power.