This calculator estimates how much offshore wind nameplate capacity is needed to deliver a target amount of annual electricity. It also converts the continuous capacity result into a whole-turbine count.
Early-stage planners can test energy targets against capacity-factor, loss, and turbine-rating assumptions. Detailed design still requires wind-resource data, layout effects, grid limits, and equipment availability.
Enter the net electricity objective in MWh per year.
Use an expectation suited to the project location and technology.
Combine modeled losses only when they are not already embedded in the capacity factor.
Use the selected unit’s nameplate MW.
Compare continuous MW with the rounded turbine count and output.
Required capacity (MW) = Target annual energy (MWh) ÷ [8,760 × Capacity factor × (1 − Loss fraction)]
Turbine count is the required capacity divided by turbine rating and rounded up. This screening method assumes one annual capacity factor and loss rate.
The main result expresses continuous capacity needed to meet the annual energy target. Use the supporting values to confirm that the scale and assumptions are internally consistent.
Results are planning estimates based on constant inputs and do not replace site-specific engineering, operational, or financial analysis.
The target is 5,000,000 MWh per year at a 46% capacity factor, 8% total losses, and 15 MW per turbine.
Required capacity = 5,000,000 ÷ (8,760 × 0.46 × 0.92) = 1,348.72 MW. Turbines = 1,348.72 ÷ 15 = 89.91, rounded up to 90.
The continuous estimate is 1,348.72 MW; a whole-turbine design would install 90 turbines or 1,350 MW.
It represents continuous capacity needed to meet the annual energy target. It reflects only the values entered and should be interpreted within the stated assumptions.
Use one consistent basis. Do not apply a loss, availability, or cost adjustment twice if it is already embedded in another input.
Use 8,784 hours when the measured period is a full leap year and the calculator includes a period-hours field. For planning estimates, 8,760 hours is the conventional annual basis.
Resource variation, curtailment, downtime, equipment degradation, grid constraints, and measurement boundaries can all change realized results.
Yes, if the inputs use matching definitions and periods. For investment or engineering decisions, compare the underlying assumptions as well as the headline result.