Innovative Energy Storage Solutions for Electric Vehicle Fleets: Challenges and Future Directions in Italy

The rapid growth of electric vehicle (EV) fleets in Italy is intensifying pressure on the national grid and raising concerns about infrastructure readiness, economic feasibility, and regulatory fragmentation. Energy storage systems (ESS) are central to addressing these challenges, yet their role in fleet electrification remains underexplored in the Italian context. This study investigates the technological, economic, and policy dimensions of energy storage innovations that can support Italy's transition toward sustainable fleet electrification in alignment with EU climate goals. A mixed-methods approach was employed, combining policy and regulatory analysis, 18 expert interviews with fleet operators, energy providers, and policymakers, and a Python-based simulation of EV fleet charging to evaluate technical performance, economic viability, and future deployment scenarios validated by a Delphi panel of 10 experts. The findings reveal that high upfront costs, limited charging infrastructure, and regional policy disparities are the primary barriers to ESS adoption. Simulation results indicate that lithium-ion batteries can reliably meet daily fleet energy demand but are constrained by degradation and grid strain under concentrated charging schedules. Scenario analysis shows that under optimistic conditions, including rapid technology development and expanded infrastructure, fleet-related emissions could be reduced by up to 40% by 2030. Overall, the study underscores that energy storage is a cornerstone of Italy's EV fleet transition and highlights the need for coordinated policy alignment, investment in advanced storage technologies, and expansion of vehicle-to- grid (V2G) services to unlock economic and environmental benefits while positioning Italy as a leader in sustainable mobility.