The SPECTRUM project aims to design, develop, prototype, and test lab-scale solar collectors that effectively utilise the entire solar spectrum to cogenerate heat, electricity and hydrogen using industrial wastewaters (IWW). This milestone occurs at the end of Task 1.1 and corresponds to the achievement of a shortlist of five potential industrial wastewaters that are the most likely candidates to benefit solar photocatalytic hydrogen cogeneration. Through joint efforts from IST-ID, UNIBO, CIEMAT and LNEG, a total of twenty seven IWW samples were identified from seventeen different companies in nine different types of industries in three european countries (Portugal, Spain, Italy). From these, and using the decision tree methodology presented in SPECTRUM’s Deliverable 1.1, all IWW were screened and ranked based on available analytical, process and literature information to compile a shortlist of eight potential IWW streams for solar photocatalytic H2 cogeneration. These include samples from wineries, pharmaceutical companies, food production industries, biodiesel production facilities and domestic wastewater treatment plants. Despite the original target of five, the list includes three additional candidates to ensure that there is wide industrial and geographical representation. Under the scope of Task 1.3, the selected samples will be subject to further analytical characterisation and based on this information, two wastewater streams will be selected for further photocatalytic testing at lab and pilot scale.