The high penetration of renewable energy in electric vehicle (EV) charging system is critical for the EV industrial promotion and carbon neutrality in transportation area. In this study, an EV charging station powered by grid, solar photovoltaic (PV) and geothermal energy from abandoned wells for a highway is proposed together with novel multi-mode operation strategies. Based on the EV charging loads predicted from highway traffic information, NSGA-II algorithm is used for capacity optimization, and two control strategies (i.e., geothermal power multistep output regulation, and geothermal power multistep output + flexible control in charging load regulation) are proposed to achieve the multimode operation. The matching relationship between energy supply and charging load under the proposed and conventional control strategies are compared. The results show that the proposed control strategies allow the optimization of geothermal operation by avoiding the frequent ON/OFF of geothermal power block and increasing its full-generation duration. As a result, the corresponding shares of renewable energy can have 14.8 % and 20.2 % increases, and operation costs are reduced by 14.4 % and 20.9 %, respectively. This study helps to promote the rational configuration of renewable energy-powered charging system for EV and enhance the low-carbon transportation infrastructure.