A vehicle includes a pump, an evaporator, and an expander in sequential fluid communication in a closed loop containing a condenser configured to transfer heat between a working fluid and ambient air. The vehicle has a generator driven by the expander. The evaporator is configured to transfer heat from at least one of an engine coolant, a battery coolant, an engine lubricant, a transmission lubricant, an exhaust gas in an exhaust system, and an exhaust gas in an exhaust gas recirculation (EGR) system to the working fluid.