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TerraPower – A nuclear innovation company

Striving to improve the world through nuclear energy and science

TerraPower’s innovators create technologies to provide safe, affordable and abundant carbon-free energy. They devise ways to use heat to drive economic growth while decarbonizing industry. And they develop processes to extract radioisotopes for medical use in lifesaving cancer treatments.

Our team combines unparalleled technical and engineering expertise, experience in delivering nuclear projects, and building organizations to tackle large-scale global challenges.

TerraPower was founded by Bill Gates and a group of like-minded visionaries that decided the private sector needed to take action in developing advanced nuclear energy to meet growing electricity needs, mitigate climate change and lift billions out of poverty. Advanced reactors and other isotopic applications are now possible with technology and enhanced computing capabilities that were unimaginable a few decades ago. At TerraPower, we are innovating in nuclear to improve the lives of people everywhere and to build the clean energy of tomorrow – today.

TerraPower’s work has benefitted from collaborations with companies that bring specialized expertise and spur growth in new industries in the process. Our domestic business relationships have included AECOM, AREVA, Becht Engineering, Bechtel Power Corporation, Brayton Energy, BWXT Nuclear Energy, Inc., The Cameron Group, Columbia Basin Consulting Group, LLC, Creative Engineers, Inc., Cryogenic Consulting Service, Curtiss-Wright Corporation, Merrick & Company, Mid-Columbia Engineering, MPR Associates, SPX Flow, Southern Company, Technology Resources, Veridiam, WECTEC and Zachry Nuclear Engineering.

TerraPower has agreements in place with many U.S. national laboratories, allowing partnerships between these federal research institutions, private-sector companies and universities. TerraPower’s work, including R&D and testing, has benefitted from collaborations with researchers from Idaho National Laboratory, Pacific Northwest National Laboratory, Oak Ridge National Laboratory, Los Alamos National Laboratory, Argonne National Laboratory, Sandia National Laboratory and the Y-12 National Security Complex.

Inquisitive minds foster innovation, so TerraPower engages the academic research community to apply the benefits of their forward thinking. Our university collaborations support the development of the next generation of nuclear engineers and physicists, and put to use the valuable research facilities available at America’s world-class universities. To date, these academic partnerships have included the Massachusetts Institute of Technology; North Carolina State University; Oregon State University; Pennsylvania State University; Texas A&M University; University of Michigan; University of Nevada, Las Vegas; University of Wisconsin; and Washington State University.

TerraPower also works with a variety of international organizations that offer specialized experience and testing facilities related to our nuclear research and development programs. By fostering international cooperation in advanced nuclear energy, TerraPower is helping keep the United States at the forefront of technology development.



Bill Gates and like-minded visionaries determine the private sector must act to develop clean energy resources to halt climate change and to raise global living standards.

Nuclear power is identified as an essential element of energy infrastructure.


Work on Traveling Wave Reactor (TWR®) physics and engineering concepts begins.

Great potential benefits of the TWR® concept are identified.


TerraPower is officially launched as a nuclear innovation company.

TerraPower logo

Engineering design of TWR concept begins.


Initial computing cluster is commissioned.


Collaboration begins with multiple national laboratories.


Detail is added to reactor and fuel design for the TWR concept.

Materials development program is established.


TerraPower laboratory is established.

Test reactor irradiation programs and ion irradiation programs are established.

TerraPower identifies molten salt reactors as a research technology.

Collaboration with universities, national laboratories and companies expands to start a global fuel, materials and component development program.


Significant advances in materials with fuels and materials experiments underway.



TerraPower signs a memorandum of understanding for cooperation with China National Nuclear Corporation for TWR program development.

TerraPower expands laboratory to a 10,000-square-foot research and development facility focused on diverse advanced nuclear energy technologies.


The U.S. Department of Energy (DOE) awards TerraPower $40 million for the research, design and testing of the molten chloride fast reactor (MCFR) project.


TerraPower reaches a cooperation agreement with China National Nuclear Corporation to form a joint venture to co-develop TWR technology.


isotopes logos

TerraPower enters into an agreement to work on medical isotopes for Targeted Alpha Therapies.

A domestic policy change in the United States prevents American suppliers from exporting non-light water, advanced reactor technology to China.


TerraPower supports congressional efforts to build a Versatile Test Reactor in the United States. The reactor will be used to research and test key materials for sodium fast reactor technologies.

TerraPower’s MCFR program research team hits 1,000 hours of continuous operation on their molten salt loop—a key milestone on the road to a reactor prototype.

DOE announces a $1 million award for a TerraPower and Ramaco Carbon project to create high-value products from coal.

TerraPower expands its laboratory space in Everett, Washington, to 65,000 sq. ft.


A Bechtel-led team, which includes TerraPower, is selected to enter negotiations to design, engineer and build the U.S. Versatile Test Reactor.

Versatile Test Reactor

The DOE awards TerraPower $80 million to demonstrate the Natrium™ reactor and integrated energy system with its technology co-developer GE Hitachi Nuclear Energy and engineering and construction partner Bechtel.

Natrium Technology Cutaway

TerraPower signs on to the Equal by 30 campaign, committing to “equal pay, equal leadership and equal opportunities” for women in clean energy by 2030.

Equal by 30


TerraPower and PacifiCorp announce efforts to advance the Natrium™ reactor demonstration project at a retiring coal plant in Wyoming.

Natrium Plant from Above


TerraPower signs memorandum of understanding with Japan Atomic Energy Agency and Japanese fast reactor industrials to collaborate on sodium fast reactor technology  


Radiopharm Theranostics and TerraPower announced an agreement to help advance the next generation of radiopharmaceutical therapies for cancer treatment. 

TerraPower and Southern Company finalized an agreement to design, construct and operate the Molten Chloride Reactor Experiment (MCRE) – the world’s first critical fast-spectrum salt reactor – at Idaho National Laboratory (INL). 

Molten Chloride Fast Reactor Technology

TerraPower was selected to receive $8.5 million in funding from the U.S. Department of Energy Advanced Research Project Agency – Energy (ARPA-E).  

The Natrium Project is Underway. Crews were onsite of the future Natrium plant in Kemmerer conducting a subsurface, or geotechnical, investigation and drilling boreholes.  

Orano and TerraPower Awarded GAIN Vouchers to Help Advance Nuclear Technologies  

Southern Company subsidiary and TerraPower complete installation of Integrated Effects Test, a key milestone in development of Molten Chloride Fast Reactor 

Global Nuclear Fuel and TerraPower Announce Natrium Fuel Facility in Wilmington, NC 

TerraPower and PacifiCorp announce efforts to evaluate the feasibility of deploying up to five additional Natrium reactor and integrated energy storage systems in the PacifiCorp service territory by 2035 

TerraPower concluded an equity raise of $830 million, the largest private raise among advanced nuclear companies.    


PacifiCorp Forecasts Need for Two Additional Natrium Reactors in New Regulatory Filing  

TerraPower Announces Strategic Collaboration Agreement with SK and KHNP TerraPower Announces Strategic Collaboration Agreement with SK and KHNP 

TerraPower and PanTera announce strategic collaboration to accelerate access to Actinium-225 

TerraPower and Centrus expand efforts to commercialize domestic HALEU production  

TerraPower Purchases Land in Kemmerer, Wyoming for Natrium Reactor Demonstration Project 

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