1,000,000,000 (or 109) Watts. This unit rose to public prominence in the 1985 motion picture Back to the Future in which 1.21 gigawatts of power were required for the time-travelling vehicle.
A measure of capacity equal to one million kiloWatts or one billion Watt .
multiple unit of active potential, equivalent to a thousand million watts, written as GW. Ground, Earth (UK): any direct metallic connection, without fuses or other protection, linking items or components of an installation and an electrode or number of electrodes sunk into the earth and with a broad enough cross section to ensure that there are no dangerous potential differences between any of the installations and allow currents due to faults or lightning to pass harmlessly into the earth.
A measure of electric capacity equal to 1 billion watts or 1 million kilowatts.