Top 10 CleanTech/Clean Energy Capital Raises and Investors in the U.S. – April 1st – May 31st, 2026

Several interesting transactions closed in the CleanTech/Clean Energy sector over the past months. If you would like to discuss the capital raising market for your company, please contact me.

PE Growth/Expansion

1. Sedron Technologies, water, energy, and waste treatment technologies that equip the world with better tools for sanitation and waste management, received $500 million of development capital from Ara Partners.
2. Silicon Ranch, solar energy plants that bring low-cost, clean energy along with economic development and jobs to the communities, received $7.62 million of development capital.

Merger/Acquisition

3. Clean Energy Services, battery energy storage systems and solar photovoltaic services for renewable energy applications, was acquired by FlexGen.
4. Engie Impact, sustainability consulting services that serve corporations, governments, and municipalities around the world, was acquired by Arcadia Power.

Later Stage VC

5. CarbonDrop, carbon capture system that tackles climate change, raised $19.63 million of Series A venture funding from investors.
6. Serva Energy, nuclear simulation platform that revolutionizes how atomic fuels are produced under the urgent timeline of climate change, raised $12.93 million of Series C venture funding from Martin Murrer and other investors.

Early Stage VC

7. Emission Free Generators, hydrogen-on-demand portable generator that provides clean, silent, and emission-free electricity in off-grid and emergency situations, raised venture funding from Mercurius Media Capital.
8. WestMET, environmental services and a sustainable resource platform that leads the energy transition through site remediation and industrial asset repurposing, raised $12.5 million of venture funding.

Seed Round

9. Alcove, traceable and collaborative platform that scales carbon credit inventory, raised $5 million through a combination of Seed-2, Seed-2A, and Seed-2B funding from BEA Venture Fund and other investors, putting the company’s pre-money valuation at $30 million.
10. Terraform Industries, atmospheric hydrocarbon synthesis technology that helps to produce natural gas from sunlight and air, raised $37.75 million through a combination of Seed funding from Myelin VC, Climate Capital and Mana Ventures, putting the company’s pre-money valuation at $182.25 million.

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Tina Vital

Managing Director

Please contact me if you have any questions or would like to discuss your capital raise:

Email: tvital@castleplacement.com

(C) (917) 432-8474

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Sources: Information on this page was derived from a variety of sources including Bloomberg, Company Websites, Crunchbase, PitchBook and other news outlets. Castle Placement® does not warrant or guarantee this information, nor makes any representations as to the accuracy of the information. For more Risks, see CPGO Risks and Disclaimers.