Abstract: Compared with a single wind farm or photovoltaic system, the wind- photovoltaic- energy storage hybrid system has the characteristics of multi-terminal source load mixing. The port impedance network and lightning transient response of the hybrid system are distinct from those of a single system. The PSCAD/EMTDC is used to build the transient model of the wind- photovoltaic-energy storage hybrid system. Then, the lightning overvoltage distribution of the hybrid system is calculated, and the effects of lightning location, overhead line length and arrester grounding mode on the overvoltage level of the hybrid system are analyzed. Results show that, in the hybrid system, the peak overvoltage of the transformer when the photovoltaic side is struck by lightning is higher than that when the wind turbine side is struck by lightning. The overvoltage of the hybrid system can be reduced by increasing the length of the overhead line connected to the bus from the wind turbine side and by decreasing the length from the photovoltaic side. It is suggested that the common grounding method is adopted in arresters at the high voltage side of the transformers at both the wind turbine and photovoltaic sides, and the separate grounding method is adopted to restrain the overvoltage at the energy storage side.