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In this paper, an optimization model and techniques to facilitate a prospective investor to arrive at an optimal plan for investment in large-scale solar photovoltaic (PV) generation projects are proposed and discussed. The optimal set of decisions includes the location, sizing, and time of investment that yields the highest profit. The mathematical model considers various relevant issues associated with PV projects such as location-specific solar radiation levels, detailed investment costs representation, and an approximate representation of the transmission system. A detailed case study considering the investment in PV projects in Ontario, Canada, is presented and discussed, demonstrating the practical application and usefulness of the proposed methodology and tools.