Question: what is gj in energy?
Answer: A gigajoule ( GJ ) is the equivalent to 1 billion joules. A joule is a measure of the energy required to send an electrical current of one ampere through a resistance of one ohm for one second. One GJ is equal to 277.8 kilowatt hours ( kWh ), 1.055 million British thermal units ( Btu ) or 0.17 barrels of oil.