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Investments in Clean Tech Week - Week of 2025/05/19
Insight • Updated May 22, 2025
Check out this week's VC investments in companies and startups in the energy space!

Nicolas Lassalle

Darcy Partners

Find below a list of VC investments in the following Innovators:

  • Calefa: a high-temperature heat pump system developer, raised $8m in PE Expansion funding from Evli Private Capital.
  • Eku Energy: a grid-scale battery energy storage system developer, raised $60m in PF Debt funding from NatWest and Sumitomo Mitsui Banking Corporation.
  • HyStar: a large scale green hydrogen production PEM electrolyzer developer, raised $36m in Series C funding from AP Ventures, Finindus, Firda, MOL switch, Nippon Steel Trading, and other investors.
  • Realta Fusion: a nuclear fusion energy developer, raised $36m in Series A funding from Future Ventures, Avila VC, GSBackers, Khosla Ventures, Mayfield, and other investors.
  • Riverse: a carbon measurement, verification and monetization platform, raised $6m in Seed funding from Alven, K Fund, Makesense, Serena Capital, and Speedinvest.
  • Solestial: an ultra-thin silicon solar panel developer, raised $17m in Series A funding from AE Ventures, Airbus Ventures, Crosscut Ventures, General Purpose Venture Capital (GPVC), Industrious Ventures, and other investors.
  • Veritree: a verified reforesting project tracking platform, raised $7m in Series A funding from Pender Ventures, Diagram Ventures, Garage Capital, and Northside Ventures.
  • VFlowTech: a vanadium redox flow battery developer, raised $21m in Growth funding from Granite Asia, Antares Ventures, EDBI, Entrepreneur First, MOL PLUS, and other investors.
  • Voltra: an EV charging infrastructure developer, raised $2m in Pre-seed funding from Contrary, Hanover Technology Investment Management, and Velocity.
  • Zendo Energy: a data center energy optimization software, raised $2m in Pre-seed funding from Fly Ventures, Octopus Ventures, and Pact VC.
  • Zeno Power: a radioisotope power system developer, raised $50m in Series B funding from Hanaco Venture Capital, 7i Capital, Balerion Space, Beyond Earth Ventures, Jaws Ventures, and other investors.

These investments signal industry traction - if you would like to learn more about any of the innovators in this article, you can contact a Darcy researcher or request an update via their Storefronts. See you next week to learn more about where VC's money is flowing!

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Investments in Clean Tech Week - Week of 2025/05/19
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