Alva Energy has raised $33 million to expand U.S. nuclear power capacity without building a single new plant. The round was led by Playground Global, with participation from Segra Capital, NGP, Mercator Partners, and Alumni Ventures. Returning investors include 8VC, Logos, Australian energy specialist Simon Holmes à Court, and environmental activist Isabelle Boemeke.
The nuclear technology company plans to upgrade existing reactors across the United States to unlock 10 gigawatts of new electric power generation capacity. This approach targets the same output as building dozens of new plants, but delivers results in a fraction of the time and at significantly lower cost. Alva aims to have its first projects online within five years.
The energy industry faces a simple problem: AI data centers and industrial facilities need massive amounts of electricity, but building new nuclear plants takes decades and costs billions. Alva's solution sidesteps this timeline entirely by retrofitting the infrastructure already in place.
"America can't afford to wait decades to build new nuclear generation capacity or for next-generation technologies to meet today's rising power demands," said James Krellenstein, CEO and Co-Founder of Alva Energy. "By upgrading the nuclear infrastructure we already have, we can deliver gigawatts of clean, always-on power to meet the needs of AI data centers, and we can do it without burdening ratepayers with the cost. With our first projects online in five years, this is the fastest, most practical way to expand carbon-free energy capacity in the U.S."
The company is standardizing what are known as "uprates" in the nuclear industry. These complex retrofit projects typically involve replacing steam generators and adding a second turbine generator to existing plants. Alva has turned this process into a repeatable, turnkey offering that increases electrical output by 200 to 300 megawatts per reactor—roughly equivalent to a small modular reactor.
The capital will enable Alva to move forward with multiple retrofit projects simultaneously while scaling its engineering teams. A significant portion of the funds will go toward securing regulatory pre-approvals from the U.S. Nuclear Regulatory Commission for key uprate methods.
Alva also plans to finalize partnerships with utilities and large-scale power consumers, including hyperscalers, who will directly finance nuclear plant retrofits. This financing model keeps costs off residential electricity bills, addressing a growing point of friction as communities push back against new data center development amid rising power costs.
The company's standardized approach could deliver the full 10 gigawatts throughout the 2030s. That timeline would outpace any new nuclear construction over the same period. Alva's uprates can be deployed as quickly as gas turbines in today's market, with comparable long-term cost but without carbon emissions.
Alva was founded to productize upgrades that have already been tested across the global nuclear fleet. The technologies underpinning its uprates have over 100 reactor-years of operating history. The company manages the full lifecycle of each project, from regulatory compliance and procurement to installation and commissioning.
The team brings extensive hands-on experience from some of the most complex nuclear projects in recent history. Members have led the fastest nuclear steam generator replacement on record, as well as the fastest and most affordable reactor design certification ever approved by the NRC. This track record gives Alva the operational foundation to scale its approach across the U.S. reactor fleet.
"The biggest obstacle standing in the way of an AI-enabled future isn't compute, it's power," said Pat Gelsinger, General Partner at Playground Global, who will join Alva's Board of Directors. "Playground invested in Alva because they're the only nuclear company designed to deliver at the speed, scale and certainty this moment demands. Their approach doesn't rely on theoretical technologies or distant timelines, it unlocks gigawatts of clean power from existing infrastructure. It's real, it's financeable and it's deployable this decade."
Alva's initial funding round included Gigascale Capital, Safar Partners, Collaborative Fund, Activate Global, and Michael Anders, the founder of ICONIQ Capital. The company has attracted investors with deep energy sector experience who point to the team's proven ability to execute as a key differentiator.
The company operates in a market where demand for clean, firm power continues to climb while traditional infrastructure struggles to keep pace. Alva's bet is that upgrading what already exists will prove faster, cheaper, and more politically viable than waiting for new construction or unproven technologies to scale.
