The capital backing climate companies in San Diego.
From Critical Capital Partners and Southern California Energy Innovation Network to the funds investing across the region, here is a starter map of the investors active in the local climate ecosystem.
Critical Capital Partners
Critical Capital Partners appears to be a Europe-based capital platform for family offices structuring growth-stage co-investment and infrastructure financing in critical industrial technology across energy, food, the built environment, and industry, not an early-stage VC and without a genuine San Diego presence beyond a portfolio link. It offers curated-network access, fundraising-prep guidance, and market intelligence rather than a defined local check. Suits growth-stage industrial and infrastructure founders seeking family-office co-investment, noting it is not a San Diego early-stage source.
Southern California Energy Innovation Network
As a capital pathway, SCEIN does not invest or grant money directly but is the state-funded conduit connecting startups to capital, helping regional founders compete for CalSEED grants, positioning them for investor showcases, and building sales pipelines and follow-on funding. Its value is a guided route to non-dilutive clean-energy grants and investor visibility rather than a direct check. Suits clean-energy founders wanting a guided path to the state grant ecosystem and investor visibility.
Tech Coast Angels
The San Diego chapter of Tech Coast Angels, now NuFund Venture Group, is one of the country's largest and most active early-stage angel groups, using a member-managed annual-fund model to invest at seed, bridge, and early Series A, able to fund a company with a meaningful early check and providing mentorship, diligence, and operational support. Its focus is broad rather than climate-dedicated, though it has funded sustainability-tech companies, and founders access it by pitching through its screening process. It is deeply San Diego-rooted. Suits San Diego founders, including cleantech, with traction seeking angel seed capital plus mentorship.
San Diego Angel Conference
The San Diego Angel Conference is an annual angel-investment conference and pooled investor fund, now hosted at San Diego State's business school, where investors buy units to form a fund and invest in winning startups selected through a months-long cycle that narrows many applicants to a few finalists. Founders receive free advising, pitch and investor-readiness training, diligence feedback, mentorship, and ecosystem connections, and while it is stage- and sector-agnostic, cleantech startups are eligible and have competed. It is deeply San Diego-rooted. Suits early-stage San Diego-region founders, including cleantech, wanting investor-readiness prep plus a shot at a pooled angel check.