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 watt-hour (Wh) is a unit of energy that measures the amount of electricity consumed or generated over time. It is the energy equivalent to one watt of power consumed for one hour. While electricity bills commonly display kilowatt-hours (kWh), understanding watt-hours can give you clearer insights into the energy efficiency of your household. For instance, a 60-watt incandescent light bulb running for one hour uses 60 watt-hours of electricity, while an energy-efficient LED bulb might only use around 10 watt-hours for the same illumination.
Interestingly, the concept of the watt-hour helps in comprehending renewable energy systems. Solar panels, for example, are rated in watts, but their output over time is often expressed in watt-hours or kilowatt-hours. Knowing this can help you assess how much energy your solar array could generate or your battery storage can hold, emphasizing the real value of alternative energy sources.
Megawatt-hours | Watt-hours |
---|---|
0
MWh
|
0
Wh
|
0.1
MWh
|
100000
Wh
|
0.2
MWh
|
200000
Wh
|
0.3
MWh
|
300000
Wh
|
0.4
MWh
|
400000
Wh
|
0.5
MWh
|
500000
Wh
|
0.6
MWh
|
600000
Wh
|
0.7
MWh
|
700000
Wh
|
0.8
MWh
|
800000
Wh
|
0.9
MWh
|
900000
Wh
|
1
MWh
|
1000000
Wh
|
1.1
MWh
|
1100000
Wh
|
1.2
MWh
|
1200000
Wh
|
1.3
MWh
|
1300000
Wh
|
1.4
MWh
|
1400000
Wh
|
1.5
MWh
|
1500000
Wh
|
1.6
MWh
|
1600000
Wh
|
1.7
MWh
|
1700000
Wh
|
1.8
MWh
|
1800000
Wh
|
1.9
MWh
|
1900000
Wh
|
2
MWh
|
2000000
Wh
|
2.1
MWh
|
2100000
Wh
|
2.2
MWh
|
2200000
Wh
|
2.3
MWh
|
2300000
Wh
|
2.4
MWh
|
2400000
Wh
|
2.5
MWh
|
2500000
Wh
|
2.6
MWh
|
2600000
Wh
|
2.7
MWh
|
2700000
Wh
|
2.8
MWh
|
2800000
Wh
|
2.9
MWh
|
2900000
Wh
|
3
MWh
|
3000000
Wh
|
3.1
MWh
|
3100000
Wh
|
3.2
MWh
|
3200000
Wh
|
3.3
MWh
|
3300000
Wh
|
3.4
MWh
|
3400000
Wh
|
3.5
MWh
|
3500000
Wh
|
3.6
MWh
|
3600000
Wh
|
3.7
MWh
|
3700000
Wh
|
3.8
MWh
|
3800000
Wh
|
3.9
MWh
|
3900000
Wh
|
4
MWh
|
4000000
Wh
|
4.1
MWh
|
4100000
Wh
|
4.2
MWh
|
4200000
Wh
|
4.3
MWh
|
4300000
Wh
|
4.4
MWh
|
4400000
Wh
|
4.5
MWh
|
4500000
Wh
|
4.6
MWh
|
4600000
Wh
|
4.7
MWh
|
4700000
Wh
|
4.8
MWh
|
4800000
Wh
|
4.9
MWh
|
4900000
Wh
|
5
MWh
|
5000000
Wh
|
5.1
MWh
|
5100000
Wh
|
5.2
MWh
|
5200000
Wh
|
5.3
MWh
|
5300000
Wh
|
5.4
MWh
|
5400000
Wh
|
5.5
MWh
|
5500000
Wh
|
5.6
MWh
|
5600000
Wh
|
5.7
MWh
|
5700000
Wh
|
5.8
MWh
|
5800000
Wh
|
5.9
MWh
|
5900000
Wh
|
6
MWh
|
6000000
Wh
|
6.1
MWh
|
6100000
Wh
|
6.2
MWh
|
6200000
Wh
|
6.3
MWh
|
6300000
Wh
|
6.4
MWh
|
6400000
Wh
|
6.5
MWh
|
6500000
Wh
|
6.6
MWh
|
6600000
Wh
|
6.7
MWh
|
6700000
Wh
|
6.8
MWh
|
6800000
Wh
|
6.9
MWh
|
6900000
Wh
|
7
MWh
|
7000000
Wh
|
7.1
MWh
|
7100000
Wh
|
7.2
MWh
|
7200000
Wh
|
7.3
MWh
|
7300000
Wh
|
7.4
MWh
|
7400000
Wh
|
7.5
MWh
|
7500000
Wh
|
7.6
MWh
|
7600000
Wh
|
7.7
MWh
|
7700000
Wh
|
7.8
MWh
|
7800000
Wh
|
7.9
MWh
|
7900000
Wh
|
8
MWh
|
8000000
Wh
|
8.1
MWh
|
8100000
Wh
|
8.2
MWh
|
8200000
Wh
|
8.3
MWh
|
8300000
Wh
|
8.4
MWh
|
8400000
Wh
|
8.5
MWh
|
8500000
Wh
|
8.6
MWh
|
8600000
Wh
|
8.7
MWh
|
8700000
Wh
|
8.8
MWh
|
8800000
Wh
|
8.9
MWh
|
8900000
Wh
|
9
MWh
|
9000000
Wh
|
9.1
MWh
|
9100000
Wh
|
9.2
MWh
|
9200000
Wh
|
9.3
MWh
|
9300000
Wh
|
9.4
MWh
|
9400000
Wh
|
9.5
MWh
|
9500000
Wh
|
9.6
MWh
|
9600000
Wh
|
9.7
MWh
|
9700000
Wh
|
9.8
MWh
|
9800000
Wh
|
9.9
MWh
|
9900000
Wh
|
10
MWh
|
1e+7
Wh
|
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