IntroductionOcean alkalinity enhancement is an emerging carbon dioxide removal approach that increases seawater alkalinity to enhance carbon uptake. This study aimed to identify potential deployment locations in Australia.MethodsA geographic information system model was applied across a 2 km coastal study extent and integrated seven spatial factors: ocean conditions, logistics, distance to the coast, cost of energy, carbon intensity of energy, desalination infrastructure, and acid disposal. Factor weightings were derived from expert pairwise comparisons using the analytical hierarchy process.ResultsWithin the study extent, 8% of the area met the criteria to be considered potentially deployable, and 0.1% was classified as highly suitable. High suitability was most strongly associated with low-cost energy, low-carbon intensity of energy, and proximity to the coast. A neighborhood density analysis of highly suitable grid cells identified five concentrated regions for further consideration. A sensitivity analysis across 280 weighting scenarios indicated moderate robustness, with 55% of highly suitable areas retaining their classification across all scenarios.DiscussionThese results provide a national-scale screening framework to support early site prioritization for electrochemical ocean alkalinity enhancement in Australia and identify candidate regions for more detailed site-specific assessment.