Like the stored chemical energy in the two components, gasoline and oxygen, that power a car, it is possible to use other chemical pairs. The combination of hydrogen and oxygen has several main advantages: The two components are easily produced by the electrolysis of water using electrical energy. The chemical reaction to get back the stored energy produces only pure water. It is possible to construct a fuel cell which enables the "cold burning" of the two components to directly produce electricity. The related Hydrogen(-Oxygen) Technology has the potential to replace fossil-fuel energy with a renewable storage technology that uses renewable solar energy sources like wind-power and photovoltaic systems to produce stored chemical energy for on-demand electricity generation.