The bond graph method is used to analyze the power flow in the recently introduced Plug-in Hybrid Electric Vehicle (PHEV) known as Range Extended Electric Vehicle (REEV). The REEV’s transmission includes an internal combustion engine, two electric machines, and three clutches. Depending on the clutch status and electric machine control action, the transmission can operate in various operating modes ranging from the electric-vehicle and series-hybrid modes to the series-parallel mode. The paper demonstrates that the bond graph method can conveniently be used to analyze and visualize the transmission power flow in different operating modes, thus facilitating understanding of the transmission behavior and development of related control strategies.