Office of Nuclear Energy | US Department of Energy

@ENERGY’s home for nuclear energy research, demos, and deployment. RT/Mentions aren't endorsements.

[U.S. Department of Energy @ENERGY]

🚨ICYMI: First test reactor in President Trump’s Pilot Program hits milestone to ramp up American nuclear power — a month ahead of schedule.

All we needed was a new President, to unleash the American Nuclear Renaissance! https://t.co/YOBWUrLU0z

[U.S. Mission to OECD @USOECD]

A historic achievement for America’s nuclear renaissance:

Antares Nuclear, a participant in @ENERGY’s Reactor Pilot Program, had their reactor successfully reach criticality at @INL — the first privately developed non-light-water reactor to do so in the United States in more than four decades

The U.S. is proud to work with partners through the Nuclear Energy Agency (NEA) to advance next-generation nuclear technologies and looks forward to co-chairing the @NEA Roadmaps to New Nuclear Ministerial Conference this September.

https://t.co/Iqd3i5H1NS

[Office of Nuclear Energy | US Department of Energy @GovNuclear]

GLOWING: Advanced Test Reactor STUNS in photo from @INL. 💅

Learn more about this incredible facility: https://t.co/kLs7lNOaQO

[Office of Nuclear Energy | US Department of Energy @GovNuclear]

WATCH 👀: This test reactor at @INL produces sudden bursts of energy that are five ✋ times more powerful than a nuclear power plant to test fuels under extreme conditions.

[Office of Nuclear Energy | US Department of Energy @GovNuclear]

How would more nuclear energy benefit your state?

[Office of Nuclear Energy | US Department of Energy @GovNuclear]

3 ways nuclear energy is lot more flexible than you might think.

[Office of Nuclear Energy | US Department of Energy @GovNuclear]

FACT: More than 90% of the potential energy still remains in spent nuclear fuel.

Some advanced reactors under development could consume or even run on this fuel in the future.

[Office of Nuclear Energy | US Department of Energy @GovNuclear]

ICYMI: About a year ago, President Trump issued four executive orders with a focus on revitalizing the U.S. nuclear energy industry.

Read about @ENERGY’s progress and what’s ahead for the U.S. nuclear sector:
https://t.co/EiyOqw8hKG

[Office of Nuclear Energy | US Department of Energy @GovNuclear]

Interest in nuclear energy is surging across the United States. Here’s one reason why. 👇
https://t.co/yAVYNgZ2He

[Office of Nuclear Energy | US Department of Energy @GovNuclear]

FACT: Uranium is the main source of fuel for nuclear reactors.

It's found as a mineral in the earth’s crust that is bonded with other elements.

Learn more: https://t.co/9JI75blEkE

[Office of Nuclear Energy | US Department of Energy @GovNuclear]

Meet Susquehanna 👋

Susquehanna Steam Electric Station borders the 1,200‑acre Susquehanna Riverlands, known for its trails, wildlife, river views, and 230+ bird species. 🐦‍⬛

[Secretary Chris Wright @SecretaryWright]

When America sets bold goals, America delivers.

Last year, President Trump challenged our nation to bring multiple advanced reactors to criticality by America’s 250th Anniversary. Today, we reach an important milestone as the first non-light-water reactor goes critical in more than 40 years.

American workers, engineers, entrepreneurs, and local communities made this possible. Their achievement is proof that the United States still leads the world in innovation—and that America’s nuclear renaissance is well underway.

[U.S. Department of Energy @ENERGY]

Today, an advanced non-lightwater nuclear reactor reached criticality in the United States for the first time in more than four decades.

Thanks to President Trump unleashing the American Nuclear Renaissance, this was made possible. 🇺🇸

[Office of Nuclear Energy | US Department of Energy @GovNuclear]

What happens when nuclear technology goes modular? ⚛️

Advanced light-water SMRs deliver 50 to 350 megawatts of power using proven pressurized or boiling water reactor technology.

[Office of Nuclear Energy | US Department of Energy @GovNuclear]

🎉 WE HAVE CRITICALITY! 🎉

On June 4, 2026, at around 12:30 MDT, @AntaresNuclear’s Mark-0 microreactor achieved initial criticality at @INL.

It is the first nuclear test reactor to go critical under @ENERGY’s Reactor Pilot Program. Congratulations to Antares on reaching this historic milestone!

[U.S. Department of Energy @ENERGY]

https://t.co/ZDknMBdCQ8

[The White House @WhiteHouse]

ONE MONTH UNTIL AMERICA’S 250TH! 🇺🇸🦅

250 years of freedom.
250 years of American greatness.

A patriotic summer has just begun as we gear up for the greatest birthday celebration in our nation’s history. The countdown to 250 starts NOW. 🔥

[Office of Nuclear Energy | US Department of Energy @GovNuclear]

NUCLEAR 101: Heat pipe reactors rely on long, thin tubes to transfer heat away from the reactor core without any pumps or moving parts.

The heat from the core evaporates a working fluid (typically liquid sodium) inside the pipes.

Learn more: https://t.co/kgSRjtudP5

[Office of Nuclear Energy | US Department of Energy @GovNuclear]

10 YEARS AND COUNTING 🔢

@TVAnews Watts Bar Nuclear Plant generates enough reliable power for more than 1.3 million homes.

Unit 2 first connected to the grid on this day in 2016, marking its tenth anniversary!

[Office of Nuclear Energy | US Department of Energy @GovNuclear]

Radioactive bananas 🍌?

Radioisotopes are unstable atoms that decay and emit excess energy.

They have hundreds of uses and can be found in countless everyday products, including these 5️⃣ for starters 👇
https://t.co/wnpVkcEvYH