• Thea Energy

  Participated · Series B · May 2026

  Thea Energy builds pixel-inspired rectangular magnets and software to generate and fine-tune stellarator magnetic fields, using many smaller planar coils to shape plasma confinement. The company says its approach lets software control arrays of regular magnets to create complex stellarator fields, and it has built dozens of full-scale magnet iterations in its Jersey City lab. Thea originally spun out of the Princeton Plasma Physics Laboratory and has iterated its design to include a set of larger magnets alongside more than 300 smaller coils that fine-tune the plasma. With $130 million in total private funding after the new Series B, Thea is scaling magnet manufacturing and plans to begin construction of its Eos demonstration reactor next year. The company aims to complete Eos by 2030 and bring a commercial device, Helios, online in 2034.

• Alva Energy

  Participated · Series A · Feb 2026

  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.

• Dig Energy

  Participated · Seed · Sep 2025

  Dig Energy has developed a compact water-jet drilling rig intended to dramatically reduce the upfront cost of shallow geothermal ground loops for heating and cooling. The founders, Dulcie Madden and Thomas Lipoma, spent about five years in stealth refining the design and drilling test holes through various soils and rock types near their New Hampshire offices. The company claims its rig can cut drilling costs by up to 80% and produces straighter holes that can be placed closer together than those from conventional rigs. Dig plans to sell its rigs to drillers and is preparing a slightly larger production version for initial commercial pilots supported by its recent seed round. The startup is positioning its technology to enable broader adoption of geothermal by making rigs small enough to access constrained sites such as backyards and crowded commercial lots.

• Eion

  Participated · Series A · Sep 2024

  Eion develops and deploys enhanced rock weathering (ERW) on agricultural lands, applying olivine and routine farming practices to capture carbon while balancing soil pH. The company holds an industry-first patent for directly measuring carbon removed by mineral weathering in soils using immobile trace elements, and relies on routine soil samples and standard equipment to monitor removal and soil conditions. Led by CEO Anastasia Pavlovic, Eion emphasizes integrating with existing agricultural systems to scale without compromising safety or rigor. The company is focused on commercial deployment, delivering against new contracts, and continuing R&D to improve measurement and application methods. Eion is targeting to deliver 10 million tons of permanent carbon removal annually starting in 2030 and aims to create stable jobs in rural communities. Eion commercializes CarbonLock, a pulverized olivine soil amendment that sequesters CO2 via enhanced rock weathering (one ton applied can absorb one ton of CO2). The olivine is mined in Norway, shipped to Mobile, Alabama, crushed to increase surface area, and applied to fields typically once every two years at roughly two tons per acre. CarbonLock also acts as an agricultural lime, reducing soil acidity, which helps farmer adoption. Eion validates sequestration by tracking the fate of olivine through measurements of magnesium and rare earth elements and monitors for heavy metals like nickel and chromium. The company is finalizing its methodology, expanding operations, and planning to build a mill to scale production. Current revenues have been supported by carbon-credit buyers such as Stripe’s climate program; Eion is exploring additional revenue sources including payments from farmers or food brands, potential federal cost-sharing, and has an off-take agreement with mineral supplier Sibelco.

No current team members are available.