In the Black Forest region of Germany, Fraunhofer researchers are leading a groundbreaking project called H2Wood - BlackForest to produce biohydrogen from wood waste. This initiative aims to utilize wood waste, abundant in the region due to furniture manufacturing and building demolition, for generating a sustainable green energy carrier. By employing biotechnological processes involving hydrogen-producing bacteria and microalgae, the researchers are able to convert old wood into biohydrogen efficiently, in alignment with the principles of a wood-based circular economy. The project, which commenced in 2021 and is financially supported by the German Federal Ministry of Education and Research with 12 million euros, focuses on developing a pilot plant expected to be operational by 2025. This plant will utilize innovative fermentation processes to produce biohydrogen from wood waste. The process involves pulping the wood waste, breaking it down into sugar molecules, and then using hydrogen-producing bacteria and microalgae to convert these sugars into biohydrogen. Additionally, the project emphasizes the production of valuable by-products like lignin, starch, and carotenoids. The by-products, including lignin, are versatile and can find applications in various industries, such as composite materials and car panels. The production process has been designed to achieve a high yield of biohydrogen from the wood waste, with approximately 0.2 kilograms of glucose produced from one kilogram of old wood, eventually resulting in the generation of 50 liters of hydrogen using anaerobic microorganisms. Furthermore, the process involves a cascade approach where CO2 produced during fermentation is utilized by microalgae to synthesize additional by-products like carotenoids. The modularly expandable pilot plant, with three bioreactors, is currently under construction, showcasing a promising future for sustainable biohydrogen production from wood waste.