Thin Line Capital

Thin Line Capital is a venture capital firm focused on investing in innovative climate-tech companies. With a strong emphasis on clean energy, electrification of transport, and climate resilience, they back low-capex businesses that align with decarbonizing the global economy. Their notable investments include Sistine Solar, which transforms solar panels to blend seamlessly into rooftops, Optiwatt, an EV network platform that lowers charging costs and emissions, and Kevala, providing analytics for smarter electricity grids. The fund primarily invests in seed-stage companies, typically deploying checks between $400,000 and $600,000. Thin Line Capital prefers a concentrated portfolio strategy, allowing them to provide hands-on support to founders through mentorship and active involvement. Headquartered in Pasadena, California, the firm is led by Aaron Fyke, an entrepreneur with extensive experience in energy storage and solar technology, having co-founded two unicorns, Heliogen and Energy Vault. For entrepreneurs seeking investment, Thin Line Capital looks for founders with a clear focus on climate-tech innovation, particularly those operating in energy efficiency, renewable energy, and industrial decarbonization. They are open to building long-term relationships and actively guiding startups through the growth process.