28+ Series A Climate Tech Startups — $816M Raised, 21 Companies

Series A climate tech funding in 2025-2026 is driven by regulatory mandates, corporate sustainability commitments, and improving economics for clean energy technologies. Our dataset tracks 21 Series A climate tech companies that raised a combined $816M at a $14M median. While the median is below the overall Series A median of $21M, the range is wide — nuclear energy startups (small modular reactors, advanced fusion) raise the largest individual rounds, while software-focused climate companies raise $8-15M. Software-defined energy management, carbon accounting platforms, and green hydrogen production are attracting significant Series A capital. European climate tech is particularly strong, driven by EU sustainability regulations. Investors like Breakthrough Energy Ventures, Lowercarbon Capital, and Congruent Ventures are the most active at the Series A stage. For GTM teams, 21 climate tech companies with $816M in fresh capital are increasingly technology-forward and purchasing cloud infrastructure, analytics platforms, compliance tools, and project management software. Target VP Operations, CTO, and Head of Sustainability.