As part of the global transition toward net zero, cleantech startups have emerged as crucial enablers of decarbonisation, resource efficiency, and circular innovation. However, accurately assessing their value remains challenging due to long R&D cycles, capital intensity, technological complexity, and policy dependence. Drawing on comparative valuation data and applying OxValue.AI’s valuation framework, grounded in the Utility Theory of Technology Value, this paper provides one of the first systematic assessments on where value is created across cleantech startups, how this varies by region and sector, and what is required to sustain and amplify that value. By analysing value creation across key dimensions, including market factors, technological novelty, lifecycle positioning, and risk and team characteristics, we offer evidence-based insights into the evolving landscape of frontier cleantech innovation and identify the diverse strategies through which cleantech innovations translate value creation into climate impact across different regions and sectors. By understanding where value is generated today and which factors underpin future value growth, policymakers, investors, and innovators can better seize green windows of opportunity and shape the pathways that accelerate the green transition.