A sizing method for economic assessment of II-life batteries for power system applications

Power system is facing increasing stress due to modernization changes in both supply, through the growing penetration level of renewable sources, and demand. In this scenario, the use of energy storage systems is becoming technologically attractive but problems of economic and ecological sustainability are still evident. For these reasons, we identify II-Life batteries as a possible solution for supporting power systems: they are a promising prospect for the modernization process. We propose a method to size an energy storage system (ESS) of exhausted plug-in electric vehicle (EV) batteries for grid support applications. The method estimates the residual value of cycles for II-Life batteries and the number of EV battery packs to meet energy service requirements. Then, an economic assessment is presented to compare them with an equivalent I-Life storage system.