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Deep Fission develops underground small nuclear reactors placed about a mile underground in deep rock to provide secure, reliable, and affordable electricity for data centers, high-performance computing facilities, and growing regions. The reactors generate power on-site and deliver electricity to customers through the grid under long-term contracts with governments and industrial partners. Its underground deployment enhances safety and security, using modular, scalable nuclear technology in a remote environment. The goal is to offer clean, low-emission energy at scale to support economic development and a sustainable future.
Industries
Industrial & Manufacturing
Energy
Company Size
51-200
Company Stage
N/A
Total Funding
$114M
Headquarters
Berkeley, California
Founded
2023
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Total Funding
$114M
Above
Industry Average
Funded Over
3 Rounds
An American company wants to solve the electricity bottleneck of data centers: the tool is nuclear reactors placed 1.8 kilometers deep. U.S.-based Deep Fission is developing small nuclear reactors to be placed over a kilometer deep to meet the growing electricity demand of data centers and artificial intelligence in particular. Today at 14:34 Aura Heikinheimo U.S. nuclear technology company Deep Fission has announced it has received letters of intent for 18.5 gigawatts of capacity from data centers, industrial companies, and strategic partners. The figure describes potential future electricity production capacity. Interesting Engineering reported on the matter. This story is free. You can read it for free by logging in or creating a free Alma account. Creating an account only takes a moment. With it, you can read more content that interests you. Aura Heikinheimo
Company proposing nuclear power facility in Kansas plans stock offering. By: Morgan Chilson - june 12, 2026 9:30 am. California-based Deep Fission began drilling bore holes in Parsons, shown here as of March 2026, as part of the company's effort to pilot a new type of nuclear reactor that would be buried 6,000 feet underground. (Photo by Deep Fission) TOPEKA - A company building an underground nuclear reactor in Parsons is planning an initial public offering of 2.5 million shares, planning to raise more than $40 million. Deep Fission Inc. initially announced in May that it would issue about 6 million shares, with a target price of $24 to $26. However, in registration information filed Wednesday with the U.S. Securities and Exchange Commission, the company dropped the number of shares it is offering and the expected price range to $16 to $18 per share. California-based Deep Fission, which partnered with the U.S. Department of Energy to build its Gravity Reactor in boreholes one mile underground in the Great Plains Industrial Park, plans to raise more than $40 million to fund its pilot project in Kansas. The company applied to list its common stock on Nasdaq under the symbol FISN, according to an SEC filing. The common stock offering will not continue if Nasdaq doesn't approve the listing. "Investing in our common stock involves a high degree of risk," the filing said. "Our Gravity Reactor is unproven, and our design, borehole development activities, planned pilot reactor, and future commercial applications may fail, progress more slowly than projected, or encounter delays or changes that increase costs and capital requirements." In its filing, Deep Fission said it has drilled its first well to gather data. "Next, we will demonstrate our ability to drill a commercial-scale borehole and safely deploy a prototype reactor," the company said. "We continue to advance our reactor design in parallel with these activities, including planning additional drilling activities and conducting related engineering and emplacement work, and we are targeting completion of these activities in the coming months." The company expects to apply for its commercial license with the U.S. Nuclear Regulatory Commission in early 2027, the filing said. The project has faced controversy in the Parsons community, with some in the area worried about the untested technology involved. Fran Tompkins, a Kansas activist following the issue, said people in the area don't want to be "lab rats." Although Deep Fission has said it is using tested technology because the deep boreholes have been used in water well drilling, Tompkins is concerned it has never been used for nuclear energy. "The tech hasn't been proven to be appropriate even for use in this way," she said. "There's no evidence-based practice out there to rely on." Morgan Chilson is an award-winning journalist who specializes in business and health care stories. She is passionate about breaking complex topics into engaging stories. Kansas Reflector is part of States Newsroom, the nation's largest state-focused nonprofit news organization.
Selling electricity from a 1-mile underground Kansas reactor depends on regulations and the community. Deep Fission says it's committed to drilling test wells and completing a pilot reactor in Kansas, but the full scope of the commercial project will rely on multiple factors. March 25, 2026 - 3:16 PM Editor's note: This article has been corrected to differentiate between the pilot reactor program and the commercialization of the project. Deep Fission is clarifying priorities for the company's 1-mile underground nuclear reactor site in Kansas, saying the group is committed to drilling data acquisition wells in Parsons and completing a pilot reactor, but how the project will be commercialized isn't clear yet. The company told the Kansas News Service that it's continuing to pursue the pilot reactor program. It has a non-binding letter of intent to sell power to the industrial park that houses the project, depending on approval. "Deep Fission remains committed to Parsons, Kansas as the site of its advanced reactor pilot project," said Deep Fission's Vice President of Communications Chloe Frader. "As always intended, we plan to pursue a commercial project at the site, following a successful test demonstration, with the final scope informed by the customer and community input." Initial announcements about the project in December said the goal was to construct a reactor at the Kansas site. Deep Fission's CEO, Liz Muller, spoke to the media at a public meeting earlier this month about the current plans for the project. She said how it ultimately develops depends on multiple factors. ADVERTISING "We've committed to doing a test well here, but again, we haven't yet committed to how big this commercial project could potentially be," Muller said. "That is something that we're going to need a lot of input from the community, and that's input that I expect we're going to get over the next few weeks and months." This test drilling enables Deep Fission to gather critical geological, hydrological and thermal data in preparation for an actual 30-inch borehole that could house the small reactor - according to a company press release. "Pending DOE authorization, the Company aims to complete construction of its first reactor and achieve criticality by July 4, 2026, at the Kansas location," that statement said. There are regulatory hurdles in Kansas law that bar selling power from the small reactors directly to energy users like data centers. ADVERTISING Kansas law prohibits the company selling power directly to customers. Deep Fission is working with electric utility Evergy to find a solution for the sale of future energy. Brad Reams is the President of Great Plains Industrial Park, the prospective location of the reactor. He said there needs to be regulatory clarity before the project can advance. "I think that there can't be any future commitments at this time until we know what the commercialization status is for the company," he said. The initial December announcement had bipartisan support from Kansas lawmakers. Lt. Gov. David Toland also serves as the Kansas secretary of commerce. ADVERTISING "Kansas has long been a leader in energy production, and we're continuing to diversify our portfolio with innovative technologies such as advanced nuclear," he said at the initial announcement. Marjorie Reynolds is a registered nurse and the president of Prairie Dog Alliance, a local group that informs residents about the nuclear reactor project. She is worried about the cost and likelihood of the project. "My fear is that this project will not work and then they're going to decide that they're going to encapsulate nuclear waste and fill up the borehole with it," Reynolds said. Reynolds is not supportive of the project because of the lack of community involvement and voting. Community leaders' only role was signing a letter of support with the company. Proponents of nuclear energy say it's one of the world's safest technologies. ADVERTISING Marc Nichol is the executive director at New Energy Institute, a Washington D.C based nuclear trade institute. "The reality of it is that we can design reactors to be safe and protect the public so that they don't receive that amount of radiation," Nichol said. The Deep Fission project is part of a pilot program by the Trump administration for reforming nuclear reactor testing at the Department of Energy. The program is also part of an executive order, allowing companies like Deep Fission to bypass specific regulations. Labette County Commissioner Vince Schibi is unsure if everything will be done by the anticipated July date. He said the success of the project depends on the results of the data acquisition. "When you start bringing in the real deal, I'm sure there's a lot more hoops to go through for the federal and the state to handle that material safely," he said. "I think it's our ace in the hole in Labette County that we need to promote it and make sure that these projects are good for us and good for the country," Schibi added. Some local residents are concerned with Deep Fission's project and nuclear energy in their backyard, but nuclear energy has become increasingly popular in the last few years. A Pew Research study reports about 59% of respondents back more nuclear plants to generate electricity. ADVERTISING This would be the second nuclear plant in Kansas after Wolf Creek Generating Station in Burlington, Kansas.
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Industries
Industrial & Manufacturing
Energy
Company Size
51-200
Company Stage
N/A
Total Funding
$114M
Headquarters
Berkeley, California
Founded
2023
Find jobs on Simplify and start your career today