On June 9, Tennessee's fusion regulatory framework became legally operative, the first time any U.S. state has licensed a fusion power plant design. Type One Energy immediately began processing its initial licensing application at the Tennessee Department of Environment and Conservation, the same application it filed with TDEC in January before the rules existed. That application targets a 350 MWe stellarator fusion plant called Infinity Two, sited at TVA's decommissioned Bull Run coal plant near Oak Ridge, with construction potentially beginning in 2028. This is not a pilot program, a research exemption, or a trial run. This is a commercial fusion plant entering the first phase of a state licensing process with a utility partner holding a signed Letter of Intent to build it.
The legal foundation for this move traces back 60 years, not 60 days. Tennessee has been an NRC Agreement State since the 1960s, a status that grants it limited regulatory authority over nuclear operations within its borders, specifically byproduct materials and radiation sources that fall outside the NRC's reactor licensing mandate. In 2023, the NRC made a pivotal decision: fusion systems, because they do not involve special nuclear material and cannot sustain a neutron chain reaction like fission reactors, would be regulated as byproduct material machines, not reactors. That single categorization handed fusion regulation to the Agreement States. Tennessee's framework, drafted in collaboration with Type One Energy and Oak Ridge National Laboratory beginning in February 2024, is simply the first state to actually write the rules and flip the switch.
Type One Energy's Infinity Two is not a hypothetical. The company has submitted concrete design specifications: 350 megawatts of electrical output, stellarator (rotational-transform confinement) architecture, construction start as early as 2028, and TVA's commitment to offtake the power. The company's Infinity One prototype, a training center and proof-of-concept facility also at the Bull Run site, is scheduled to commission in 2029. This is a 5-year runway from regulatory approval to operating fusion baseload on a major utility grid. Christofer Mowry, Type One's CEO, framed the licensing application announcement on January 29, 2026 as validation: 'We've been working closely together since February 2024, sharing relevant design information and knowledge that is essential to establish the appropriate licensing conditions for a fusion power plant. This collaboration makes Tennessee an international model of safety by design and transparency for licensing fusion machines.' That is not vendor spin, that is a company that has already spent 16 months collaborating with a state regulator and now has a legal pathway to build.
But the real story is not Type One Energy. It is the market structure that just inverted. Until June 9, fusion companies operated in a single licensing regime, federal, slow, uncertain. Starting June 9, they operate in a competitive licensing market. Alexander Valys, cofounder and president of Xcimer Energy, said at the June 1–3 ANS Annual Conference that the NRC's decision to cede fusion licensing to Agreement States was 'the freedom to consider the contrasting benefits of many states when deciding where to build pilot plants.' But he also flagged the risk: 'We're probably going to want something more standardized, as opposed to having to worry about 40 licensing regimes.' That is exactly what will happen now. Tennessee has published a template. Other Agreement States, California, Illinois, New York, Florida, will either adopt Tennessee's tech-neutral approach or lose fusion siting to states that do. Tennessee's David Salyers, TDEC Commissioner, made this explicit: 'This latest step supercharges our reputation as the global hub for nuclear innovation and positions us as the most responsive state to new advanced nuclear companies clamoring to call Tennessee home.' The state-level competition for fusion manufacturing and operations is now live.
The open question is execution velocity. Type One Energy aims to begin Infinity Two construction in 2028, that is two years to finalize licensing, secure permitting, and mobilize capital. That is compressed for a 350 MWe facility, even under a sympathetic state regulator. The Infinity One prototype commissioning in 2029 will be the real test: if that facility operates as scheduled, the 2028 Infinity Two timeline becomes credible. If it slips, every other fusion company's state-by-state timeline gets pressure-tested against reality. Watch the Infinity One commissioning date, that is the bellwether for whether state-level fusion regulation actually accelerates commercial deployment or just relocates the bottleneck from federal to state bureaucracy.