
CEO of @ProjectOmegaHQ, Scientist and Entrepreneur, @Yale PhD
United States
Joined January 2010
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Thanks for a sharp conversation across orbit and critical minerals during a Climate Week NYC panel hosted by @BCapitalGroup and @CerberusCapital and fellow panelists from @rivensystems and @StarCatcherInd like @rushspace.
My message: the US is sitting on roughly 100,000 metric tons of used nuclear fuel, a national resource holding fuel for reactors and isotopes that can provide power for decades.
At @ProjectOmegaHQ we're building the refinery for the nuclear century.
Tomorrow, I'm joining @Greg_Lindsay, @YingShirleyMeng, and Jeff Marootian (CEO of @UL_Standards) to talk about how resilient energy systems are critical for energy independence at @FastCompany's Innovation Festival in NYC. Come check it out:
It was a pleasure hosting our Congressman, @RepAuchincloss, in @ProjectOmegaHQ's Massachusetts laboratory earlier this week.
We're doing incredible work with partners at @PNNLab, @INL, @DARPA, and @ARPAE to refine nuclear waste and separate energy-dense materials for portable power sources, they're like a battery that lasts 30 years.
Together with leaders in @HouseCommerce, we're reviving America's nuclear industry just in time to fulfill our rapidly increasing energy needs.
Kudos to @ADoricko and the @RainmakerCorp team for taking a fact-based and scientific approach. Proper measurement and verification is critical for weather technologies, and it’s been missing until recently.
Rainmaker just produced ~19M gallons of water in Alaska via next-gen cloud seeding over 3 hours of operations.
We are the first company to provably produce precipitation in Alaska. As promised, we’ve linked our white paper and relevant data.
In the future, Rainmaker will protect and restore glaciers with man-made snowfall.
Immediately, this demonstration shows how Rainmaker will add new water to the Colorado River and Great Salt Lake in the coming months.
We turned around this analysis and white paper just a couple days after operating. There are many data sources I want to deepen our understanding of the atmosphere and increase our provable production; we’re building the instruments to collect that data in subsequent operations. But at Rainmaker, we won’t tout LOIs, simulations, or lab tests. What matters is physically measuring that you’ve affected the atmosphere; proving that we’ve produced water. We prefer sharing only the tech that has proven to make more water for farms, industries, and ecosystems in need.
Expect a regular cadence of these from us as we build the best atmospheric science lab in the world. Feedback is welcome in the interim.
Rainmaker Century.
rainmaker.com/blog/alaska-va…
The narrative around nuclear energy in the U.S. has been shaped by misconceptions and policy failures rather than technical limitations.
In reality, nuclear power is safer than many alternatives (e.g., coal), but public perception remains skewed due to costs and scary messaging versus lives lost.
The U.S. government’s failure to uphold waste storage agreements has created logistical and legal issues, not scientific issues.
Meanwhile, strategic decisions led to dependence on foreign energy sources and challenges to our supply chain for isotope access.
Although interest in nuclear is resurging, only companies actively building infrastructure will be successful @AntaresNuclear, @AaloAtomics, @TheNuclearCo, @standardnuclear, @valaratomics, @Oklo, @generalmatter, and us at @ProjectOmegaHQ, to name a few.
Like electricity in its early days, nuclear still faces uncertainty and some fear that can be overcome through standards, education, and time.
With recent advancement with reactors and the President’s Executive Orders advancing nuclear, things are starting to change.
Be a part of the change.
Staff Sheehan retweeted
Since 1957, the rules of space have largely been dictated by a single constraint: energy. For nearly 70 years, the space industry has accepted that satellites must constantly chase the sun to operate.
The physics are unyielding, the farther you get from the sun, the less viable solar power becomes. It limits your maneuverability and operational effectiveness.
We are fundamentally changing space power with small nuclear power sources. Space exploration is experiencing a massive surge in ambition, and the old energy models can no longer support the infrastructure we want to build.
Isotope powered systems completely rewire the equation by eliminating the sun-facing limitations that have restricted satellite design.
• Total Operational Freedom: No more steering spacecraft around solar alignment or losing power in orbital shadows.
• True Deep Space Viability: Scalable, reliable power that thrives whether you are in Earth's orbit or the farthest reaches of the solar system.
• Unprecedented Power Density: Delivering the high-output energy required for the next generation of space infrastructure and commercial enterprise.
Project Omega is bringing this next-generation power architecture to the market and helping unlocking the ability to explore at scale.
People talk about the American manufacturing renaissance like it's a political slogan.
We outsourced our manufacturing base to China more than 30 years because cheap labor, cheap energy, and a frictionless supply chain. during this same time, we let the nuclear industry in this country atrophy.
We told ourselves we'd be friends forever and built an economy dependent on a strategic adversary.
We're now in the position of needing to rebuild both at the same time.
Bringing that manufacturing back for semiconductors, rare earth processing, battery components, defense supply chains, etc. requires enormous amounts of electricity that is reliable, always-on, high-density electricity that can power industrial processes around the clock.
But you have to actually generate that electricity needed.
Wind and solar are intermittent. They're part of the answer. But you cannot run a 24/7 industrial operation on power that depends on whether the sun is shining or the wind is blowing.
You need baseload power that’s steady, reliable, always available.
That's nuclear.
Reactors in the U.S. generate power continuously. They do that regardless of weather, season, or time of day. The fuel is domestically producible… if we rebuild the fuel cycle we let atrophy. The carbon intensity is close to zero compared to most other energy sources.
You can't reindustrialize America without solving the energy problem and you can't solve the energy problem without nuclear.
Staff Sheehan retweeted
A friend just sent me this. I was under the impression we could only use the first 10% of nuclear before having to put it aside as “waste“ so… recycling nuclear waste seems pretty green to me.
When Russia cut off natural gas to Europe after invading Ukraine in 2022, two interesting things happened.
• Germany's energy prices exploded. Factories shut down. The government scrambled to reopen coal plants they'd just closed.
• France kept the lights on.
It's because of a decision France made decades ago.
France generates about 70% of its electricity from nuclear power. More importantly, they recycle their spent nuclear fuel. They run a mixed-oxide fuel cycle.
They take used fuel, separate out the reusable uranium, fabricate it into fresh fuel, and run it through their reactors again.
The result is a country that produces most of its own electricity, recycles its own fuel, and doesn't depend on Russian pipelines or Middle Eastern supply chains to keep its lights on.
Germany went the other direction. They had shut down their nuclear plants on the assumption that renewables would fill the gap and Russian gas would stay cheap and reliable. Neither assumption held.
Energy independence is built over decades through infrastructure decisions.
We now have the opportunity to build a nuclear infrastructure here in the United States to provide us greater energy resilience.
And that includes the more than 90,000 metric tons of used fuel sitting at 75 sites across the country waiting for us to use to power the next generation of innovations.
People ask me what @ProjectOmegaHQ means for the future, here’s one example.
Your iPhone. The one you're charging right now. The one you forgot to plug in last night. It always dies at 4pm, when you actually need it.
We can change that, with the portable nuclear power sources that we’re developing, safely. It’s not new, we all already have at least one nuclear device in our homes, keeping us safe.
We've been so constrained by what current power sources can do that we've stopped imagining what devices could do if the battery problem went away entirely, or if your iPhone was self-charging.
We are building the defense version, the space version, the AI version of this. In the future, we aim to make the consumer version too.
Kale was romaine’s sorry stepsister.
But companies like @sweetgreen redefined the product by educating people on the benefits.
I've been thinking about this as we build @ProjectOmegaHQ.
Nuclear is not an easy thing to make feel approachable. The word “nuclear” carries fifty years of cultural baggage with people picturing Chernobyl and protest signs.
The instinct is to respond with serious and technical communications that reassure people that we know what we're doing.
But 'serious' and 'technical' don't disarm fear.
Stories do. The most important marketing job we have at Project Omega isn't explaining what nuclear recycling is, but rather making people feel something positive about it. Curiosity. Optimism. Maybe even a little excitement.
First product mention in @tomshardware! Achievement unlocked, @ProjectOmegaHQ
DARPA plans 30-year endurance nuclear waste batteries to power next-gen drones, says report tomshardware.com/tech-indust…
Most people hear "radioactive decay" and think: danger, cleanup, decades of storage costs. We hear: untapped energy.
@ProjectOmegaHQ is part of a team that includes @northropgrumman, @MorganStateU, and @PNNLab that received a $3.37M Defense Advanced Research Projects Agency @DARPA contract under the Rads to Watts program, announced today.
The goal is to generate electricity directly from isotopes, recovered from Cold War-era nuclear waste and recycled nuclear fuel. The system uses beta-emitters layered onto semiconductor devices to meet power density targets that older technology couldn't approach. Here's what that actually means in practice:
Power sources for satellites, moon bases, and Mars landers that provide mission-critical energy even when the sun doesn't shine.
Autonomous recharging stations on the ocean floor for UUVs that operate continuously for 20 years, keeping national security assets running in places where swapping batteries isn't an option.
And much more: businesswire.com/news/home/2…
Staff Sheehan retweeted
Thank you to the @UCANPowerDC team for the opportunity to discuss how @ProjectOmegaHQ is helping to reshape the future of nuclear energy.
In the conversation, @CDmAI and @staffsheehan Sheehan explored a simple but important question: What if the materials we currently call "nuclear waste" are actually strategic assets?
From recycling used nuclear fuel into both new reactor fuel and critical isotopes to develop long-duration power sources, the United States has an opportunity to unlock tremendous value from resources already in our inventory.
They also discussed the growing role of advanced fuel cycle technologies, recent work supporting @ARPAE and @DARPA initiatives, and why energy resilience and national security are increasingly linked.
Appreciate the thoughtful discussion and the chance to share Project Omega's vision for turning yesterday's liabilities into tomorrow's competitive advantage.
Listen now to learn how innovation is reshaping the nuclear fuel cycle and why it matters for national security and energy resilience: youtube.com/watch?si=qeV-q0G…
#NuclearEnergy #EnergyAbundance #NationalSecurity
In the 1980s, the US Department of Energy made a promise to every nuclear power plant operator in America.
Step 1: Build your plant.
Step 2: Pay into the Nuclear Waste Fund.
Step 3: We will take your spent fuel by 1998.
The operators (Constellation, Dominion Energy, Southern Nuclear, Duke Energy Corporation, etc.) built their plants and paid into the fund, tens of billions.
1998 came and went.
The plan had been to build a permanent repository at Yucca Mountain in Nevada, a deep, geologically stable site in the desert where used nuclear fuel could be stored safely for thousands of years.
The site was chosen after years of study and construction was authorized by Congress, but… politics.
So the fuel stayed at 52 sites across the country, in pools and dry casks, and the operators started suing. Lawsuits don’t solve anything, I can tell you from experience.
96% of that material is reusable uranium. The conversation has been entirely about storage and disposal and almost nobody has been asking how to extract the value still locked inside it.
Yucca Mountain failed because we were trying to bury an asset.
The better answer was always to recycle it.
Staff Sheehan retweeted
The U.S. has 100,000 metric tons of used nuclear fuel stored. It still contains more than 90% of its original energy.
But today, there is no way to recover any of it.
Project Omega’s goal is to change that, together with Idaho National Laboratory and with the contract we announced in April from the Department of Energy’s ARPA-E, we are now executing.
Most nuclear recycling attempts rely on a process that has a massive wastewater problem. Our pyroprocessing approach skips all of that to separate materials with fewer secondary waste streams.
There’s a $100B+ liability sitting in temporary storage right now, and taxpayers are on the hook for long-term waste management of material that could be powering the grid.
We see this liability as an opportunity.
Staff Sheehan retweeted
We’re excited to welcome Dr. Cameron Goodwin to Project Omega as our new Head of Research & Development.
Dr. Goodwin brings more than a decade of leadership across nuclear operations, regulation, and advanced reactor innovation. Most recently, she served as Director of the Rhode Island Atomic Energy Commission, where she oversaw the state’s only nuclear facility and led all operational and regulatory efforts.
Prior to that, she held key roles at the U.S. Nuclear Regulatory Commission, contributing to operating reactor licensing and advancing next-generation technologies, including SMRs and non-lightwater reactors.
#NuclearEnergy #EnergyAbundance #NationalSecurity
@staffsheehan @johannajones
Staff Sheehan retweeted
With more advanced technology in development, there are new needs for energy: from AI, drones and vehicles. When these technologies are deployed for with our men and women in uniform, our forward operating bases require continuous energy sources but it’s often in places that are incredibly difficult to resupply.
Getting fuel or batteries to those locations is dangerous, expensive, and increasingly what adversaries target first.
This contested logistics problem, one of the greatest and underdiscussed national security challenges the U.S. faces.
Right now, the solutions are mostly diesel generators and lithium batteries, but diesel requires constant resupply convoys, which are vulnerable and costly
What we need is a power source that doesn't run out and that doesn't need a convoy to refuel. A type of power that can operate for years in remote or hostile environments without human intervention.
That's not a fantasy because the physics exists. Radioisotope power systems (nuclear batteries) have been doing exactly this for decades on deep space probes.
Voyager 1 has been running on one battery since 1977 and is still transmitting data from interstellar space. The question is why we haven't industrialized it for the applications that need it most.
You run out of energy before you run out of bullets.
What gets called nuclear waste still holds over 90% of its original energy. We stopped at step one of a three-step process to utilize this resource. Now, we aim to turn used nuclear fuel into a national resource.
Your smoke detector contains nuclear waste, Americium-241. So does the fuel powering satellites to Mars.
In the latest installment of Principals, @carsonjbecker sits down with @staffsheehan, founder and CEO of @ProjectOmegaHQ, to discuss recycling spent nuclear fuel, the economics of nuclear waste, and the future of nuclear-powered energy systems. Read it at @arenamag



















