The megawatt-hour (MWh) is a unit of energy that measures electricity production, consumption, or energy flow over time. It is commonly used to bill large-scale electricity consumers, such as factories or entire cities. To put it into perspective, one megawatt-hour can power about 330 homes for an hour or a single home for 330 hours! In the realm of renewable energy, just one megawatt-hour of wind energy can offset over 1,100 pounds of carbon dioxide emissions—a significant environmental benefit.
Moreover, the world’s energy needs are so vast that in 2022, global electricity consumption soared to over 26,000 terawatt-hours (TWh), where one terawatt-hour equates to one million megawatt-hours. This highlights how crucial units like the MWh are in understanding and managing our energy use and impact.
The kilojoule, abbreviated as kJ, is a unit of energy in the International System of Units. While it may not be as commonly recognized as calories in everyday conversation, the kilojoule is actually the standard metric unit for quantifying energy. Fascinatingly, 1 kilojoule is equivalent to 0.239 calories, making it a handy unit for converting nutritional information, especially in countries that primarily use the metric system.
Interestingly, the term “joule” is named after the English physicist James Prescott Joule, who studied the nature of heat and discovered its relationship to mechanical work. This unit has applications far beyond nutrition, including physics, chemistry, and engineering, where it measures various types of energy transformations, from kinetic to thermal. Understanding kilojoules can deepen our appreciation of energy, highlighting the intricate balances that power our world and our bodies.
| Megawatt-hours | Kilojoules |
|---|---|
0
MWh
|
0
kJ
|
0.1
MWh
|
360000
kJ
|
0.2
MWh
|
720000
kJ
|
0.3
MWh
|
1080000
kJ
|
0.4
MWh
|
1440000
kJ
|
0.5
MWh
|
1800000
kJ
|
0.6
MWh
|
2160000
kJ
|
0.7
MWh
|
2520000
kJ
|
0.8
MWh
|
2880000
kJ
|
0.9
MWh
|
3240000
kJ
|
1
MWh
|
3600000
kJ
|
1.1
MWh
|
3960000
kJ
|
1.2
MWh
|
4320000
kJ
|
1.3
MWh
|
4680000
kJ
|
1.4
MWh
|
5040000
kJ
|
1.5
MWh
|
5400000
kJ
|
1.6
MWh
|
5760000
kJ
|
1.7
MWh
|
6120000
kJ
|
1.8
MWh
|
6480000
kJ
|
1.9
MWh
|
6840000
kJ
|
2
MWh
|
7200000
kJ
|
2.1
MWh
|
7560000
kJ
|
2.2
MWh
|
7920000
kJ
|
2.3
MWh
|
8280000
kJ
|
2.4
MWh
|
8640000
kJ
|
2.5
MWh
|
9000000
kJ
|
2.6
MWh
|
9360000
kJ
|
2.7
MWh
|
9720000
kJ
|
2.8
MWh
|
1.008e+7
kJ
|
2.9
MWh
|
1.044e+7
kJ
|
3
MWh
|
1.08e+7
kJ
|
3.1
MWh
|
1.116e+7
kJ
|
3.2
MWh
|
1.152e+7
kJ
|
3.3
MWh
|
1.188e+7
kJ
|
3.4
MWh
|
1.224e+7
kJ
|
3.5
MWh
|
1.26e+7
kJ
|
3.6
MWh
|
1.296e+7
kJ
|
3.7
MWh
|
1.332e+7
kJ
|
3.8
MWh
|
1.368e+7
kJ
|
3.9
MWh
|
1.404e+7
kJ
|
4
MWh
|
1.44e+7
kJ
|
4.1
MWh
|
1.476e+7
kJ
|
4.2
MWh
|
1.512e+7
kJ
|
4.3
MWh
|
1.548e+7
kJ
|
4.4
MWh
|
1.584e+7
kJ
|
4.5
MWh
|
1.62e+7
kJ
|
4.6
MWh
|
1.656e+7
kJ
|
4.7
MWh
|
1.692e+7
kJ
|
4.8
MWh
|
1.728e+7
kJ
|
4.9
MWh
|
1.764e+7
kJ
|
5
MWh
|
1.8e+7
kJ
|
5.1
MWh
|
1.836e+7
kJ
|
5.2
MWh
|
1.872e+7
kJ
|
5.3
MWh
|
1.908e+7
kJ
|
5.4
MWh
|
1.944e+7
kJ
|
5.5
MWh
|
1.98e+7
kJ
|
5.6
MWh
|
2.016e+7
kJ
|
5.7
MWh
|
2.052e+7
kJ
|
5.8
MWh
|
2.088e+7
kJ
|
5.9
MWh
|
2.124e+7
kJ
|
6
MWh
|
2.16e+7
kJ
|
6.1
MWh
|
2.196e+7
kJ
|
6.2
MWh
|
2.232e+7
kJ
|
6.3
MWh
|
2.268e+7
kJ
|
6.4
MWh
|
2.304e+7
kJ
|
6.5
MWh
|
2.34e+7
kJ
|
6.6
MWh
|
2.376e+7
kJ
|
6.7
MWh
|
2.412e+7
kJ
|
6.8
MWh
|
2.448e+7
kJ
|
6.9
MWh
|
2.484e+7
kJ
|
7
MWh
|
2.52e+7
kJ
|
7.1
MWh
|
2.556e+7
kJ
|
7.2
MWh
|
2.592e+7
kJ
|
7.3
MWh
|
2.628e+7
kJ
|
7.4
MWh
|
2.664e+7
kJ
|
7.5
MWh
|
2.7e+7
kJ
|
7.6
MWh
|
2.736e+7
kJ
|
7.7
MWh
|
2.772e+7
kJ
|
7.8
MWh
|
2.808e+7
kJ
|
7.9
MWh
|
2.844e+7
kJ
|
8
MWh
|
2.88e+7
kJ
|
8.1
MWh
|
2.916e+7
kJ
|
8.2
MWh
|
2.952e+7
kJ
|
8.3
MWh
|
2.988e+7
kJ
|
8.4
MWh
|
3.024e+7
kJ
|
8.5
MWh
|
3.06e+7
kJ
|
8.6
MWh
|
3.096e+7
kJ
|
8.7
MWh
|
3.132e+7
kJ
|
8.8
MWh
|
3.168e+7
kJ
|
8.9
MWh
|
3.204e+7
kJ
|
9
MWh
|
3.24e+7
kJ
|
9.1
MWh
|
3.276e+7
kJ
|
9.2
MWh
|
3.312e+7
kJ
|
9.3
MWh
|
3.348e+7
kJ
|
9.4
MWh
|
3.384e+7
kJ
|
9.5
MWh
|
3.42e+7
kJ
|
9.6
MWh
|
3.456e+7
kJ
|
9.7
MWh
|
3.492e+7
kJ
|
9.8
MWh
|
3.528e+7
kJ
|
9.9
MWh
|
3.564e+7
kJ
|
10
MWh
|
3.6e+7
kJ
|
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