The Gigajoule is really a multiple from the joule, which happens to be the SI derived unit for Power. From the metric system, "giga" would be the prefix for billions, or 109. Gigajoules may be abbreviated as GJ XJ-13, generally known as "XJ13" and "XK Thirteen," can be a hybrid https://rto.zpia.in/gujarat/surendranagar-gj13