What is gigawatt?
A gigawatt is a unit of power equal to one billion watts. It is used to express the total power output of national electricity grids, large power stations, and national energy policy targets.
Real-world uses
Gigawatts describe the generating capacity of entire national grids, large hydroelectric dams (Three Gorges Dam: ~22.5 GW), and the total installed solar or wind capacity of countries. Global electricity demand is often expressed in terawatts (1,000 GW). Energy policy discussions use GW to compare national ambitions.
History
Gigawatts entered common use in discussions of national and continental electricity systems during the 20th century. As installed generation capacity in large countries reached the gigawatt scale, this unit became standard for energy policy, grid planning, and international energy statistics.
Common mistakes
Confusing GW (power) with GWh (energy). A 22 GW dam running at full capacity for one hour generates 22 GWh of energy. Also, the pop-culture reference "1.21 gigawatts" from Back to the Future is frequently cited but would equal about 1,210 MW—a large power plant.
What is kilowatt?
A kilowatt is a unit of power equal to 1,000 watts. It is commonly used to rate electric motors, heating systems, solar panels, EV chargers, and industrial equipment.
Real-world uses
Kilowatts are used for rating home electrical systems, electric vehicle charging speeds (Level 2 chargers: 7–22 kW), solar panel array output, electric motors in appliances, and small generators. A typical household may have a peak demand of 3–10 kW.
History
As electricity supply systems expanded in the late 19th century, the kilowatt became the practical unit for measuring power demands and generation capacities beyond the range of single watts. Its adoption enabled standardised rating of motors, generators, and electrical infrastructure.
Common mistakes
Confusing kilowatts (kW, power) with kilowatt-hours (kWh, energy). A 7 kW EV charger running for 2 hours delivers 14 kWh of energy. Also, mixing up kW and kVA in electrical specifications—kVA is apparent power, not real power.
When is this conversion used?
Converting gigawatt to kilowatt is useful in the power domain when comparing values across different measurement standards or applying formulas that require a specific unit.
Worked examples
1 gigawatt = 1,000,000 kilowatt
1 kilowatt = 1,000 watt
How to convert gigawatt to kilowatt
To convert gigawatt to kilowatt, multiply the value by 1,000,000.
To convert kilowatt back to gigawatt, multiply by 0.000001.
Measurement standards
The watt is the SI derived unit of power, defined as one joule per second (kg·m²/s³). Horsepower remains in widespread informal use, particularly in the automotive industry, but has no single universal definition across regions.
Did you know?
The human body at rest produces about 80 watts of power — roughly enough to keep an incandescent light bulb glowing. During intense exercise, a trained cyclist can sustain over 400 watts, and elite sprinters briefly exceed 2,000 watts.
Quick reference: gigawatt to kilowatt
| gigawatt | kilowatt |
|---|---|
| 0.1 | 100,000 |
| 0.5 | 500,000 |
| 1 | 1,000,000 |
| 2 | 2,000,000 |
| 5 | 5,000,000 |
| 10 | 10,000,000 |
| 25 | 25,000,000 |
| 50 | 50,000,000 |
| 100 | 100,000,000 |
| 250 | 250,000,000 |
| 500 | 500,000,000 |
| 1,000 | 1.000000e+09 |
Common values
| gigawatt | kilowatt | |
|---|---|---|
| LED light bulb | 1.000000e-08 gigawatt | 0.01 kilowatt |
| Desktop computer | 3.000000e-07 gigawatt | 0.3 kilowatt |
| Microwave oven | 0.000001 gigawatt | 1 kilowatt |
| Small car engine | 0.000075 gigawatt | 75 kilowatt |
| Wind turbine (large) | 0.003 gigawatt | 3,000 kilowatt |
Available Power units
More gigawatt conversions
- Convert gigawatt to watt
- Convert gigawatt to kilowatt
- Convert gigawatt to horsepower (mechanical)
- Convert gigawatt to megawatt
- Convert gigawatt to milliwatt
- Convert gigawatt to microwatt
- Convert gigawatt to BTU per hour
- Convert gigawatt to kilocalorie per hour
- Convert gigawatt to ton of refrigeration
Assumption: horsepower values use mechanical horsepower.