Susan Preston, General Partner of the California Clean Energy Angel Fund. See sector focus and contact routes.
Susan Preston, General Partner of the California Clean Energy Angel Fund, invests in seed and early-stage clean energy companies, with typical check sizes of $300,000–$500,000 per round. Her portfolio includes notable startups such as Alphabet Energy (waste heat recovery), REEL Solar (solar cell manufacturing), Lumetric Lighting, and Allopartis Biotechnologies, reflecting a thesis focused on capital-efficient technologies in solar, energy efficiency, transportation, and lighting. Preston specifically targets the funding gap between founder capital and traditional venture capital to foster innovation in renewable energy and energy efficiency sectors.
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