Annual electricity use calculator
Turn a hypothetical facility’s MW load into annual MWh and GWh using its operating hours and average load fraction.
Educational reference only. Examples and calculator results are not approved installation designs, equipment selections or operating instructions.
Your inputs
Results update as you edit. Use a decimal point. Default values are hypothetical, not recommended equipment sizes.
An illustrative whole-facility electrical load, not a reported company total.
Percentage of the reference MW while the facility is operating.
A full ordinary year is 8,760 h; a full leap year is 8,784 h.
Illustrative result
- Annual electricity estimate
- 613.2 GWh
- Annual electricity estimate
- 613,200 MWh
- Average power while operating
- 70 MW
Worked steps
- Paverage = 100 × 0.7 = 70 MW
- E = 70 × 8,760 = 613,200 MWh
- 613,200 MWh / 1,000 = 613.2 GWh
Calculations use unrounded values; displayed steps are rounded to three decimal places or five significant digits for extreme values.
Formula and units
E (MWh) = reference load (MW) × average operating load fraction × operating hours; GWh = MWh / 1,000
Change one input to see its effect. Inputs are calculated in your browser and are not submitted to a calculation service.