Cambridge-based Alva Energy is productizing nuclear plant upgrades, or “uprates,” turning what are normally bespoke retrofit projects into repeatable, turnkey packages. By replacing steam generators and installing a second turbine generator, the company can boost output from existing reactors by 200–300 MWe each, targeting a cumulative 10 GWe of new capacity for the U.S. grid. Its approach leverages technologies with more than 100 reactor-years of operating history, allowing deployment on timelines and costs competitive with new gas turbines yet without carbon emissions. Alva manages the full lifecycle—including NRC compliance, procurement, installation, and commissioning—to reduce risk and shorten schedules. The firm plans to bring its first upgraded reactors online within five years and works with hyperscalers and utilities to finance projects without raising residential rates. This standardized model is positioned to meet surging electricity demand from AI data centers and other industrial loads. The recent $33 million Series A provides the capital to advance multiple uprate projects, scale engineering teams, and secure regulatory pre-approvals, laying the groundwork for gigawatt-scale expansion through the 2030s.

Total raised

$33M

Funding rounds

1

Latest round

Series A

Latest activity

Feb 2026