Energy conversion tables
Unit Equivalent to; Watts (w): 1 Joules (J) per second: Gigajoules (GJ): 1 x 10 9 Joules (J): Gigajoules (GJ): Million British thermal units (MMBtu): Gigajoules (GJ): x 10 5 Watthours (): Gigajoules (GJ): Kilowatthours (): Gigajoules (GJ): Megawatthours (): Gigajoules (GJ): x 104 Gigawatthours .