A system includes a reversible proton exchange membrane (PEM) fuel cell stack configured to receive oxygen and to controllably receive water and hydrogen, an electrical bus for coupling to a vehicle engine to receive electricity, the electrical bus coupled to the reversible fuel cell stack to controllably receive electricity from the fuel cell stack and provide electricity to the reversible fuel cell stack, and a hydrogen storage unit coupled to controllably receive hydrogen from the fuel cell stack, provide hydrogen to the fuel cell stack, and to provide hydrogen to a hydrogen gas powered electricity generator unit to couple to the electrical bus.