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About SHINE
SHINE is a fusion technology company headquartered in Janesville, Wisconsin. We are building the fusion economy through commercial products, each one funding the next.
Today, we use neutrons to inspect and test critical components for aerospace, defense and research customers. Our medical isotopes are used to diagnose heart disease and in cancer treatments, and in Janesville we are constructing an isotope production facility designed to produce up to half the world’s supply once at full operation. We are developing technology to recycle used nuclear fuel, targeting a commercial plant to address a portion of the 94,000 metric tons that have accumulated in the United States. We design, build and operate our own fusion systems and facilities, a platform we are scaling toward our long-term goal: to put fusion energy on the grid.
Available for interview
Greg Piefer
Founder & CEO, SHINE
Greg Piefer is the founder and CEO of SHINE, a company transforming nuclear fusion from scientific ambition into real-world impact. Under his leadership, SHINE has developed and deployed commercial, fusion-based systems across sectors including healthcare, advanced manufacturing, and national security—laying the groundwork for economically viable fusion energy. His vision extends to nuclear waste recycling and ultimately developing economically viable fusion energy.
Greg holds a PhD in nuclear engineering and bachelor’s degrees in physics and electrical and computer engineering from the University of Wisconsin–Madison. Since founding SHINE in 2010, he has focused on transforming scientific breakthroughs into scalable solutions that address global challenges and improve lives.
Employees advancing fusion applications worldwide
Total funding Series D
Founded in Janesville, WI
Active commercialization in 3 markets
Fusion reactions per second on our steady state fusion systems
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Frequently Asked Questions
SHINE is a fusion technology company based in Janesville, Wisconsin. We were founded to remove energy as a constraint on human growth. Our long-term goal is commercially viable fusion energy — and we get there by putting our fusion technology to work on problems that need solving now.
Step by step instead of one enormous project. Every product and service we sell earns revenue, giving us operating experience and sharpening the technology. That’s what drives costs down on the way to commercial fusion power.
Today our fusion systems power industrial testing: neutron imaging that inspects critical aerospace and defense components, and radiation effects testing that shows how electronics hold up under radiation. We also design and build fusion systems for customers. In nuclear medicine, we supply Ilumira (lutetium-177) for cancer therapy and Tc-99m generators for diagnostic imaging, and we're building Chrysalis to produce Mo-99 with fusion. And we're developing technology to recycle used nuclear fuel, using fusion to transform the long-lived waste that remains.
We view used nuclear fuel as a potential resource rather than a long-term liability. Most of that material can be recycled and reused. Safe, advanced recycling shrinks the volume that has to go into storage, recovers valuable materials that are otherwise imported, and creates a stable domestic fuel supply at the same time.
Safety comes first and regulators hold us to it. Our facilities run under rigorous oversight, using sophisticated technology and multiple layers of safety systems designed to protect our team, the public and the environment.
We aim to be long-term partners in the communities where we work. We employ about 450 people in skilled jobs across engineering, manufacturing, radiochemistry and operations. And we partner with local schools and community organizations to train the next generation of that workforce.
Most energy sources today are limited by what their raw materials cost. But fusion runs on deuterium, which is abundant in seawater and inexpensive, and it produces carbon-free power that can run around the clock. As we continue to innovate and scale, we aim to unlock a form of energy that is not only clean and reliable but also economically accessible, similar to how other transformative technologies have become more cost-effective as they have matured.
Our long-term goal is to make fusion energy commercially viable. We’re taking a deliberate, market-based approach, building the technology platform by solving high-value problems today like making medical isotopes and running industrial testing. That work refines the technology, builds the infrastructure, and generates revenue along the way. We believe prioritizing economic viability alongside technical progress is the fastest route to fusion power.
SHINE was founded in 2010 by Greg Piefer.