The workshop indicated that there is indeed a compelling economic case for SIDS to move away from fossil fuels, towards systems in which PV plays a major – if not dominant – role in generation. In fact, modeling presented at the workshop indicated that adding at least 35% PV to the generation mix would lower the cost of producing electricity on each of the six islands examined. On half of the islands, data indicated that the local utilities could add over 90% of PV to the generation mix and still cut costs. Part I of this report presents an overview of the relevant case studies, including the modeling assumptions used.