Top 10 CleanTech/Clean Energy Capital Raises and Investors in the U.S. – September 16th – 30th, 2025

Several interesting transactions closed in the CleanTech/Clean Energy sector over the past two weeks. If you would like more info on these deals or would like to discuss the capital raising market for your company, please contact me.

PIPE

1. 1. ESGold, a Canadian environmentally aware resource exploration and processing company, received CAD 8 million of development capital.
   2. Graftech International, high-quality graphite electrode products essential to the production of EAF steel and other ferrous and non-ferrous metals, Graphite India acquired a 6.82% stake in the company (NYS:EAF) for INR 1681.3 million.

Buyout/LBO

3. 3. 2050 Partners, a consultancy firm that helps utilities and clients across the energy sector manage rising demand through customer-focused energy efficiency programs, was acquired by West Monroe Partners, via its financial sponsor Blue Owl Capital, through an LBO.

Merger/Acquisitions

4. 4. Pulsed Hydraulics, pulsed hydraulic mixing technology related services for water and wastewater treatment, was acquired by Parkson, a subsidiary of Axel Johnson.

Later Stage VC

5. 5. Xheme, specialty chemicals that improves product quality, sustainability, and safety across various industrial sectors, raised $40,000 of venture funding through a combination of debt and equity.
   6. Heartland, proprietary wastewater treatment technologies that solves challenging wastewater problems, raised $7.15 million of venture funding.

Early Stage VC

7. 7. EV Realty, a grid-scale charging infrastructure technology that electrify last-mile delivery and service fleets, raised $75 million of venture funding.
   8. Fourth Power, thermal battery storage that harness wasted wind and solar production to respond to grid needs with fossil fuels, raised $20 million of Series A Plus venture funding in a deal led by Munich Re Ventures.

Accelerator/Incubator

9. 9. Power to Hydrogen, cost anion exchange membrane electrolyzers that produces clean hydrogen, joined NGIF Accelerator as a part of its Industry Grants program and received $159,970 in funding.

Seed Round

10. 10. TriplePoint, clean energy storage services that revolutionizes the energy landscape by pioneering underground clean energy solutions for hydrogen and compressed air using salt caverns, raised CAD 4.57 million of seed funding.

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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.