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.
NuFund Venture Group
The NuFund Venture Group is one of the 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.