Eksajoule

An eksajoule, commonly spelled exajoule in English, is the unit of energy equal to 10^18 joules. Its symbol is EJ. It is an SI-derived unit used to express very large quantities of energy, such as national or regional energy consumption, production, and certain climate model outputs.

Conversion facts: 1 EJ = 1,000 PJ = 1,000,000 TJ = 1,000,000,000 GJ. In terms of electric energy, 1 EJ is approximately 277.8 terawatt-hours (TWh) of electricity, equivalent to about 2.78×10^11 kilowatt-hours. In other common terms, the exajoule is a quintillion joules.

Origin and spelling: The name uses the SI prefix exa- for 10^18; exajoule is the standard form in English. Eksajoule is a transliteration variant found in some languages or informal usage; standard technical literature uses exajoule.

Usage: Exajoules are used in global energy accounting, e.g., to report total primary energy consumption or production for countries and the world, or to describe energy content in fuels on large scales. It is useful for comparing energy magnitudes across economies and over time.

See also: Joule, kilojoule, megajoule, gigajoule, terajoule, petajoule, watt-hour, terawatt-hour.