You will wonder that your cars will be run by water instead of petrol or diesel. Shree Ratan TATA has announced to make a car, driven by water. Hydrogen the future fuel for automobiles is derived from water by electrolysis process with help of solar panels. One cubic meter (at NTP) of hydrogen would require 3.266 KWh of DC electric energy. Three cubic meter (at NTP) of hydrogen will provide as much power as one liter diesel to your vehicle.
Decade ago we heard that cars will be run by water. The fossil fuels like diesel, gas and petrol will be replaced by water. This surprise is possible in now a day. The hydrogen is separated from water by electrolysis process with the help of solar panels.