November 12, 2025 — Cleantech Open, the world’s largest and longest-running clean technology accelerator, marked its 20th anniversary at the 2025 Global Forum, held Oct. 27–30 at the San Jose Convention Center in California. The event was co-located with VERGE 2025, a major climate-tech conference hosted by GreenBiz Group that brings together startups, corporations, investors and government officials to accelerate decarbonization and clean energy innovation.
Founded in 2005, Cleantech Open has supported more than 4,000 entrepreneurs and alumni companies have raised more than $4 billion in funding.