Brazil is making strides in cleantech innovation by fortifying an expansive network of over 80 policy-backed technology parks. These parks have facilitated a significant increase in cleantech venture funding, reaching $2.9B over the past five years, driven by activities in agritech and micromobility. As global climate strategies shift towards decarbonization and green hydrogen integration, these technology parks are becoming crucial in developing the necessary technologies. They provide resources such as equipment, lab space, and mentorship to address innovation challenges, ultimately accelerating the commercialization of innovative products. Technology parks also play a key role in organizing public sector approaches to tackle national climate strategies. The success of innovators in these parks relies on how well technology responds to local climate issues and market demands. While start-up activity is primarily concentrated in southeast Brazil, efforts are being made to boost innovation in regions with historically lower levels of investment. For instance, Parque de Ciência e Tecnologia Guamá in the Amazonas region focuses on forestry and resource conservation. Corporate involvement in these technology parks is crucial, with the public sector consistently supporting their initiatives through policy instruments. State-backed efforts have prioritized sectors like agriculture, renewable energy, heavy industry, and nature-based solutions. Initiatives like ANPROTEC and NIB aim to establish and promote innovation ecosystems across Brazil. Furthermore, programs such as Startup OutReach Brazil and PROINFA have been instrumental in connecting local start-ups to global innovation ecosystems and incentivizing renewable energy sources. The article emphasizes the importance of mobilizing local private sector actors to sustain cleantech development, especially in the face of changing policy support. Efforts to facilitate international partnerships through technology parks can help overcome funding challenges for local cleantech start-ups, with Brazil's active involvement in global initiatives like the Green Hydrogen Organization and UNFCC enhancing its attractiveness to international investors. Overall, Brazil's state-backed technology parks are playing a vital role in driving cleantech innovation and fostering sustainable development.