What does gigawatt mean?
A gigawatt is a metric unit of power equal to one billion watts, or 10^9 watts. It is used when discussing electrical generation, transmission, consumption, and large energy systems, often with figures such as “a 1-gigawatt power plant” or “several gigawatts of renewable capacity.” The unit is especially relevant to discussions of power stations, wind farms, solar facilities, data centres, and national electricity networks. Although the word is technical, it is also used informally or metaphorically for an exceptionally large amount of power, influence, or impact. Understanding the distinction between power and energy is important: watts and gigawatts measure the rate at which energy is produced or used, whereas watt-hours and gigawatt-hours measure the total energy supplied over time.
nounA unit of power equal to one billion watts (10^9 watts), used especially in electrical engineering, energy production, and large-scale power systems.
- A unit of power equal to one billion watts (10^9 watts), used especially for electrical generation, transmission, and consumption.
"The offshore wind farm is designed to generate several gigawatts of electricity."
"The solar installation has a generating capacity of 2 gigawatts."
"The campaign's reach was described in hyperbolic terms as gigawatts, emphasizing its enormous potential impact."
Used when referring to multiple quantities of power or multiple facilities or systems measured in gigawatts.
"The project combines several gigawatts of solar and wind capacity."
One gigawatt equals one billion watts, while a gigawatt-hour is the energy that one gigawatt of power would supply in an hour.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does gigawatt come from?
The word was formed by combining the SI prefix giga-, meaning one billion, with watt, the unit named after the Scottish engineer James Prescott Watt. The prefix giga- derives from Greek gigas, meaning “giant,” and belongs to the metric system of prefixes based on powers of 1,000. Related formations include kilowatt and megawatt, while gigabyte and gigahertz reuse the same prefix in other measurement systems.
Related word forms
How gigawatt is actually used
The term is primarily technical and is most common in energy, electrical engineering, and infrastructure discussions. In informal or promotional contexts, it may also be used metaphorically to indicate an enormous quantity or impact.
Easily confused with gigawatt
A gigawatt is one million megawatts, so gigawatt describes a far larger quantity of power.