physics

Milestone-Based Fusion Development Program

Milestone-Based Fusion Development Program is a physics topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Milestone-Based Fusion Development Program rather than just read about it. In short: The Milestone-Based Fusion Development Program is an ongoing program under the United States Department of Energy, Office of Fusion Energy Sciences to support the development of a fusion pilot plant (FPP) and commercialization of fusion power. As of 2024, eight private companies have received commitments for a total of $46 million for the first 18-month period of performance.

Key takeaways

Milestone-Based Fusion Development Program belongs to physics; place it in that map before memorising details.
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Reproduce the core statement of Milestone-Based Fusion Development Program from memory before moving on to harder problems.

Reference excerpt

The Milestone-Based Fusion Development Program is an ongoing program under the United States Department of Energy, Office of Fusion Energy Sciences to support the development of a fusion pilot plant (FPP) and commercialization of fusion power. As of 2024, eight private companies have received commitments for a total of $46 million for the first 18-month period of performance. The program is planned to run for five years and culminate in one or more preliminary engineering designs for a fusion pilot plant.

History The need for a fusion pilot plant has been recognized throughout the program to develop fusion power. Most recently before the announcement of the Milestone-Based Fusion Development Program, in 2021 the National Academies of Sciences, Engineering, and Medicine (NASEM) released a report which highlighted the need for such a program and advised its creation. In 2022 the Biden Administration and DOE announced a Bold Decadal Vision for Commercial Fusion Energy, which included plans for a pilot-plant development program. The Funding Opportunity Announcement (FOA) was announced by the US Department of Energy in September 2022, and $50 million was allocated for the first 18 months of the program. Applications were received in December 2022. Eight companies were selected for award negotiations in May 2023. However, agreements were not signed with the awardees until more than a year later in June 2024, reportedly due to concerns over how intellectual property would be handled. In June 2024, at a White House Summit, the Department of Energy announced that all eight companies had successfully concluded detailed milestones negotiations with the federal government and that agreements had been signed to commence the Milestone Program.

Awardees The eight awardees are:

Commonwealth Fusion Systems (Cambridge, MA) Focused Energy, Inc. (Austin, TX) Thea Energy, Inc. (formerly Princeton Stellarators, Inc., Branchburg, NJ) Realta Fusion, Inc. (Madison, WI) Tokamak Energy, Inc. (US subsidiary of UK-based company, Bruceton Mills, WV) Type One Energy Group (Madison, WI) Xcimer Energy Corp. (Denver, CO) Zap Energy, Inc. (Everett, WA) Awardees' approaches vary, including the tokamak (2 firms), the stellarator (2 firms), inertial confinement (2 firms), the magnetic mirror (1 firm), and the z-pinch (1 firm).

Structure The program is structured as a public–private partnership between the DOE and the awardees. The companies receive federal payments upon completing quantitative milestones, up to the full award amount. The program is structured in three periods of performance: One spanning the first 18 months, one spanning the second 18 months, and one spanning the remaining 24 months of the five-year term. The first period of performance will presumably end around the end of 2025, assuming a start date based on the June 2024 announcement. Only the first period of performance has been announced and awarded. The $46 million number is for the first period of performance. Subsequent periods of performance have not as of 2024 been announced or awarded. The applicants were encouraged to propose collaborations with US national laboratories, with which the awardees would contract separately and pay directly. For example, Oak Ridge National Laboratory will work with six of the eight companies.

Milestones As of January 2025, the DOE has announced that at least 3 companies have completed at least 5 scientific and technical milestones. While the specific milestones are typically protected information of the company, the following were announced. There may be more milestones that have been completed:

Computational modeling for a high-gain target design for laser-driven inertial fusion energy (Focused Energy) Demonstration of ion-beam focusing to support fast-ignition approach to inertial fusion energy (Focused Energy) Whole-device modeling of simple mirror equilibria to enable scientific energy gains of at least 5 for the tandem-mirror approach to fusion energy (Realta Fusion) Down selection to a family of optimized stellarator equilibria taking into account multiple factors of plasma confinement, stability, and stellarator components and subsystems (Thea Energy) Engineering design, prototyping, and operation of a single, high-temperature-superconducting magnet coil that is the building block of Thea Energy's approach to generating 3-dimensional, optimized stellarator fields using only planar coils (Thea Energy) In December 2025, Thea Energy completed a milestone resulting in the certification of its preconceptual pilot plant design. This was the final major design milestone of the first period of performance.

Dispute over intellectual property The year-long gap between the announcement of awardees and their signing agreements with the DOE was apparently due to a dispute over how companies' intellectual property would be treated under the award. Reporting stated that the companies' rights to existing and subject intellectual property was inadequately safeguarded under the DOE's initial proposed terms. At the time of the announcement, the total private investment in Commonwealth Fusion Systems was over $2 billion.

Awardee table

See also List of nuclear fusion companies

References

Worked examples

Example 1 — a first encounter with Milestone-Based Fusion Development Program

Start with the simplest possible case. Write down what Milestone-Based Fusion Development Program claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In physics, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Milestone-Based Fusion Development Program before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Milestone-Based Fusion Development Program ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Milestone-Based Fusion Development Program

In research: Milestone-Based Fusion Development Program appears in physics research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Milestone-Based Fusion Development Program in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Milestone-Based Fusion Development Program is common in secondary-school and first-year university syllabi. It links to neighbouring topics Engineering companies of the United States, Fusion power, Fusion power companies, so understanding it makes those chapters shorter.
In everyday life: Look for Milestone-Based Fusion Development Program outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Milestone-Based Fusion Development Program in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Milestone-Based Fusion Development Program means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Milestone-Based Fusion Development Program out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Milestone-Based Fusion Development Program in simple terms?

Why does Milestone-Based Fusion Development Program matter?

Because it connects several physics ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Milestone-Based Fusion Development Program?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Milestone-Based Fusion Development Program.