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This paper investigates the potential of using secondhand electric vehicle (EV) batteries to provide storage in a hybrid wind battery plant (HWBP). A number of used Li-ion EV batteries are assumed connected to an existing wind park operating on the noninterconnected island of Crete. The optimal size of the hybrid extension is determined using genetic algorithms (GAs). The potential revenues that can be achieved by the HWBP from its participation in the electricity market are estimated. Results indicate that the proposed business model is economically beneficial in case rejected wind energy is stored for later use. Profit margin varies according to the price of oil consumed by the thermal units whose energy is substituted by the output of the HWBP.