This £200,000 nine-month long project, studied the impact of removing brine from undersea stores that could, in future, be used to store captured carbon dioxide. It was carried out by Heriot-Watt University, a founder member of the Scottish Carbon Capture & Storage (SCCS) research partnership, and Element Energy. T2 Petroleum Technology and Durham University also participated in the project. It built on earlier CCS research work and helped develop understanding of potential CO2 stores, such as depleted oil and gas reservoirs or saline aquifers, located beneath UK waters. It also helped to build confidence among future operators and investors for their operation. Reducing costs and minimising risks is crucial if CCS is to play a long-term role in decarbonising the UK’s future energy systemThis project aims to assess the potential for brine production through dedicated wells in target CO2 storage formations to increase CO2 storage capacity and reduce the overall cost of storage - as well as any other potential benefits for CO2 store operators associated with brine productionThis report presents findings from the entire project, and references other project reports where appropriate.