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Turbine Annual Energy Production Calculator

Work out turbine annual energy production instantly with clear inputs, formula shown and shareable results.

About Turbine Annual Energy Production Calculator

Annual energy production is rated power x 8760 hours x capacity factor, then reduced by turbine availability and electrical losses in cables and transformers. Full-load hours — net energy divided by rated power — is the standard comparison figure, typically 2200-3500 hours onshore and 3500-4800 offshore.

Formula

Annual energy production

AEP = rated power x 8760 x capacity factor x availability x (1 - electrical losses)

Worked example

With the default values below, Turbine Annual Energy Production Calculator returns Annual Energy Production of 13,222.49. Change any input above and every figure here is recalculated in your browser.

Inputs used

Turbine Rated Powerminimum 0 MW
4.2 MW
Net Capacity Factoraccepts 0.01–100 %
38 %
Turbine Availabilityaccepts 0.01–100 %
97 %
Electrical And Transformer Lossesaccepts 0–20 %
2.5 %

Results

Annual Energy Production
13,222.49
Gross Energy Before Losses
13,980.96
Equivalent Full-Load Hours
3,148.2
Net Capacity Factor
35.939%

Step by step

  1. 1Values used
  2. 2Annual energy production
  3. 3Annual Energy Production= 13,222.49
  4. 4Gross Energy Before Losses= 13,980.96
  5. 5Equivalent Full-Load Hours= 3,148.2
  6. 6Net Capacity Factor= 35.939

Assumptions and limits

  • The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
  • Figures are rounded for display to 3 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

Where does capacity factor come from?

From convolving the site's wind speed distribution with the turbine power curve, then applying wake, blade soiling, icing and curtailment losses. A bankable estimate needs at least a year of on-site measurement.

Why does turbine choice matter at a given site?

A larger rotor on the same generator raises capacity factor at low wind speeds, producing more energy and steadier output even though rated power is unchanged. That is why specific power ratings have fallen steadily.

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