First Reactor in Trump Pilot Program Hits Milestone to Ramp Up Nuclear Nationwide

Energy News Beat

The U.S. Department of Energy (DOE) announced a historic milestone on June 4, 2026: Antares Nuclear’s Mark-0 advanced microreactor has achieved criticality—the point at which a nuclear reactor sustains a self-sustaining chain reaction capable of producing steady energy. This marks the first success under President Trump’s Reactor Pilot Program and the first time in more than four decades that a privately developed, non-light-water reactor has reached this critical stage in the United States.

The achievement validates the safety and operational viability of Antares’ design and paves the way for subsequent reactors to begin producing electricity as early as 2027. It comes ahead of schedule and demonstrates the rapid progress enabled by the Trump administration’s aggressive push to revitalize American nuclear energy.

Backstory: Trump’s Nuclear Renaissance and the Reactor Pilot Program

On May 23, 2025, President Donald Trump signed four executive orders aimed at unleashing a new nuclear renaissance. One key order, “Reforming Nuclear Reactor Testing at the Department of Energy,” directed the DOE to streamline processes for advanced reactor testing and demonstration. It established the Reactor Pilot Program—a new pathway that leverages DOE’s authority under the Atomic Energy Act to authorize test reactors outside national laboratories, bypassing lengthy traditional NRC commercial licensing for research and demonstration purposes.

The program’s ambitious goal: approve and bring at least three advanced reactors to criticality by July 4, 2026—the nation’s 250th anniversary. Ten companies were selected, with projects focused on microreactors, small modular reactors, and other advanced designs suited for data centers, military bases, manufacturing, and beyond. The initiative emphasizes speed, safety, and private-sector innovation, with dedicated DOE support teams assigned to each project.

Energy Secretary Chris Wright celebrated the milestone, stating: “It is fitting that on the eve of our nation’s 250th anniversary, we are witnessing a historic moment for American energy. For the first time in more than four decades, a new privately developed non-light-water reactor has reached criticality in the United States. Thank you to President Trump for his bold leadership…”

Antares Nuclear CEO Jordan Bramble added that the DOE program has been “a transformative catalyst,” accelerating not only reactor physics but also regulatory pathways and supply-chain mastery.

This pilot is part of a broader strategy to quadruple U.S. nuclear capacity to 400 GW by 2050, support AI-driven data center demand, strengthen national security, and ensure reliable, carbon-free baseload power.

Current State of U.S. Nuclear Power: Fleet Stats and Generation

As of March 2026, the United States operates 96 commercial nuclear reactors at 57 nuclear power plants across 28 states. These reactors have a combined net summer electricity generation capacity of 98,441 megawatts (MW)—roughly 98.4 GW. The fleet’s average age is about 44 years, with the newest unit (Vogtle Unit 4 in Georgia) entering service in April 2024.

Nuclear power remains a cornerstone of the U.S. electricity mix:

It accounts for approximately 18% of total U.S. electricity generation.
In recent years (e.g., 2024 data), the fleet produced around 816 terawatt-hours (TWh) annually.
Nuclear plants run at an exceptionally high average capacity factor of 91%—far higher than most other sources—delivering reliable, around-the-clock power.

Illinois leads with 11 reactors, and the fleet is concentrated east of the Mississippi River. No new large reactors are currently under construction beyond Vogtle’s recent completions, but the focus has shifted to uprates, restarts, and advanced designs.

License Extensions: Keeping the Fleet Running Strong

Many of America’s nuclear reactors are approaching or have reached the end of their original 40- or 60-year licenses. The Nuclear Regulatory Commission (NRC) has approved 20-year license renewals for dozens of reactors over the past two decades, and subsequent license renewals (SLR) to 80 years are now accelerating.

In 2025 alone, 13 reactors at seven plants received 20-year extensions. Recent approvals include plants like Browns Ferry, Point Beach, and others. Applications for additional SLR extensions are under review or planned for 2026–2027, including Ginna, Prairie Island, and more.

Notable recent developments:

Diablo Canyon (California’s only operating nuclear plant) received a 20-year federal license extension through 2045 (state approval pending).

The Trump executive orders explicitly direct agencies to support continued operation, extensions, and even restarts of prematurely closed plants.

While a handful of reactors have licenses expiring in the near term (e.g., certain units in 2026–2027), the combination of ongoing NRC reviews, uprates (targeting 5 GW additional capacity), and the administration’s pro-nuclear policies make widespread premature retirements unlikely. The emphasis is on preserving and expanding this proven, emissions-free fleet amid surging electricity demand.Looking AheadThe Antares milestone is just the beginning. With two more pilot reactors expected to hit criticality by July 4, the DOE’s Nuclear Energy Launch Pad initiative, and broader reforms to NRC licensing, the U.S. is positioned for a true nuclear resurgence. These advances will help power data centers, bolster grid reliability, and reduce dependence on intermittent sources.As Secretary Wright noted, this is “the future of nuclear energy in the United States.”

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