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In this paper, we estimate the potential marine energy available from different types of resources in Colombia: waves, tides, currents, salinity gradients and thermal gradients, focussing on specific locations. The main constraint on this analysis is the lack of long-term marine instrumentation and data. In order to overcome this difficulty, we use oceanic numerical modelling with data from reanalysis models, climatic data from remote sensors, and primary data from existing instrumentation and fieldwork. The models were calibrated and run to calculate—based on existing marine systems—the potential nationwide marine power resources, on different time and spatial scales, for both the Colombian Caribbean and Pacific coasts. For each marine resource, we first explain the method used to assess the power potential; then we present the potential marine energy result. Further, we carry out a policy analysis where we discuss not only the power potential but also the barriers (mainly cost) faced by marine energy. Given the potentials found by earlier studies, these results define for Colombia, and also for Central and South America generally, the road map for future pre-feasibility analysis, taking into account the energy demands of the populations, existing technologies, and the environmental, social and geographical characteristics of the regions. [ABSTRACT FROM AUTHOR]