MWh to GWh Converter

Convert megawatt-hours (MWh) to gigawatt-hours (GWh) instantly with this free energy conversion resource. Whether you’re analysing power station output, wind farm generation, or national grid consumption data, this converter provides accurate results for energy professionals across the UK.

Quick Conversions

MWh to GWh Conversion Table

This reference table shows common energy values you’ll encounter when working with UK power stations and renewable energy installations.

Megawatt-Hours (MWh) Gigawatt-Hours (GWh)
1 MWh0.001 GWh
10 MWh0.01 GWh
50 MWh0.05 GWh
100 MWh0.1 GWh
250 MWh0.25 GWh
500 MWh0.5 GWh
750 MWh0.75 GWh
1,000 MWh1 GWh
2,500 MWh2.5 GWh
5,000 MWh5 GWh
10,000 MWh10 GWh
25,000 MWh25 GWh
50,000 MWh50 GWh
100,000 MWh100 GWh

Conversion Formula

Converting between MWh and GWh is straightforward once you know the relationship between these energy units.

MWh to GWh

GWh = MWh ÷ 1,000

Or alternatively:

GWh = MWh × 0.001

GWh to MWh

MWh = GWh × 1,000

Step-by-Step Conversion

Here’s how to manually convert 3,750 MWh to GWh:

  1. Start with your value: 3,750 MWh
  2. Divide by 1,000 (because there are 1,000 MWh in 1 GWh)
  3. 3,750 ÷ 1,000 = 3.75 GWh
  4. Result: 3,750 MWh equals 3.75 GWh

What These Units Mean

Megawatt-Hour (MWh)

A megawatt-hour represents one megawatt of power sustained for one hour. It equals 1,000 kilowatt-hours (kWh). To put this in perspective, a typical UK household uses about 2.7 MWh of electricity per year. Most onshore wind turbines with 2-3 MW capacity can produce approximately 6 MWh of electricity each year.

Gigawatt-Hour (GWh)

A gigawatt-hour equals one gigawatt of power maintained for one hour. This unit is more suitable for discussing large-scale energy production and consumption. The UK’s major power stations and national grid statistics typically use GWh when reporting annual generation figures. One GWh equals 1,000 MWh or one million kWh.

Practical Examples

UK Power Stations

Keadby 2 Power Station, one of Europe’s most efficient gas-fired plants, generates 849.45 MW. Running at full capacity for 24 hours, it would produce approximately 20,387 MWh or 20.387 GWh of electricity daily.

Wind Farms

A typical 2.5 MW onshore wind turbine in the UK produces around 6,000 MWh (6 GWh) annually. A large offshore wind farm with 100 turbines of 3 MW capacity could generate approximately 600,000 MWh or 600 GWh per year, enough to power roughly 160,000 homes.

National Consumption

In 2024, UK wind farms generated enough electricity to power over 22 million homes. This represents approximately three-quarters of all households nationwide. Such large figures are typically reported in terawatt-hours (TWh), where 1 TWh equals 1,000 GWh or 1,000,000 MWh.

Scale Comparison

Visualising the Scale

1 MWh
0.001 GWh
100 MWh
0.1 GWh
500 MWh
0.5 GWh
1,000 MWh
1 GWh
Note: When working with energy data, always verify which unit is being used. Mixing up MWh and GWh in calculations can lead to errors of magnitude 1,000. This is particularly important when analysing power station output reports or grid consumption data.

Related Energy Conversions

Understanding how MWh and GWh relate to other energy units helps when working with different data sources.

From To Multiply By
Watt-hour (Wh)MWh0.000001
Kilowatt-hour (kWh)MWh0.001
MWhGWh0.001
GWhTerawatt-hour (TWh)0.001
MWhkWh1,000
GWhMWh1,000
GWhkWh1,000,000
TWhGWh1,000

FAQs

How many MWh are in 1 GWh?
There are exactly 1,000 megawatt-hours in one gigawatt-hour. This means 1 GWh = 1,000 MWh. The prefix “giga” represents one billion (10⁹), while “mega” represents one million (10⁶), making GWh 1,000 times larger than MWh.
When should I use GWh instead of MWh?
Use GWh when discussing large-scale energy production or consumption, such as annual power station output, national electricity statistics, or major wind farm generation. MWh is more appropriate for smaller installations, daily generation figures, or individual facility consumption. If your numbers exceed 10,000 MWh, consider switching to GWh for easier readability.
What’s the difference between MW and MWh?
MW (megawatt) measures power—the rate of energy flow at any given moment. MWh (megawatt-hour) measures energy—the total amount consumed or generated over time. Think of MW as speed and MWh as distance travelled. A 10 MW power plant running for 5 hours generates 50 MWh of energy.
How many homes can 1 GWh power?
In the UK, the average household uses approximately 2.7 MWh (0.0027 GWh) of electricity annually. Therefore, 1 GWh could power roughly 370 typical UK homes for one year. However, this varies based on household size, energy efficiency, and consumption patterns.
Is the conversion the same worldwide?
Yes, the mathematical conversion between MWh and GWh is universal—1 GWh always equals 1,000 MWh regardless of location. However, how these units are applied varies. Some countries prefer different units for reporting energy statistics, but the actual conversion ratio remains constant globally.
What’s bigger than a GWh?
The terawatt-hour (TWh) is the next unit up from GWh. One TWh equals 1,000 GWh or 1,000,000 MWh. TWh is commonly used for national-level energy statistics. For example, the UK’s total annual electricity consumption is measured in hundreds of TWh.
Can I convert GWh to MWh by multiplying?
Yes, to convert GWh to MWh, multiply by 1,000. For example, 2.5 GWh × 1,000 = 2,500 MWh. Conversely, to convert MWh to GWh, divide by 1,000. The conversion is linear and straightforward.
Why do energy companies use different units?
Energy companies choose units that best suit the scale of data they’re reporting. Household bills use kWh because typical consumption is 2,000-4,000 kWh annually. Power stations report in MWh or GWh because they generate much larger quantities. National grids use TWh for annual statistics. The appropriate unit makes numbers easier to read and compare.

Related Posts

Scroll to Top