Capacity factors at Danish offshore wind farms

Posted by – 2017/07/25

monthlygenHere are the average capacity factors of every Danish offshore wind farm, newly updated to include data to the end of June 2017. The Anholt 1 windfarm, which only opened in 2013, hit an average capacity factor of 47.4% for the full year 2016. Compare these with the capacity factors for German and UK offshore wind farms.

Danish windfarms also include the most productive wind turbines in the world, at Rønland I: the turbines have been operating for over 14 years now, with a lifetime capacity factor of 44.5%; of its eight turbines, four are rated at 2.3MW peak power, and each of those four had by the end of July 2014 generated over 100 GWh: the first turbines to pass that milestone.

And, for the first time, I’ve had to update the calculations for a new phenomenon: the first decommissioning of a commercial offshore windfarm: Vindeby generated its last electricity in February 2017, after a remarkable 25 years of life.

All numbers are to the end of June 2017. Analysis by Raw data from ens.dkLatest
elec. gen.
Power per
unit area
Rolling annual
capacity factors
(click to enlarge)
Total45.2%41.5%127141 0782.6Total
Anholt 152.9%48.8%4.2399.67 2532.2Anholt 1
Avedøre Holme36.7%38.2%7.010.8253Avedøre Holme
Horns Rev I42.5%42.0%14.71608 6373.4Horns Rev I
Horns Rev II49.3%47.9%7.8209.36 8743.0Horns Rev II
Middelgrunden26.8%25.5%16.5401 478Middelgrunden
Nysted (Rødsand) I36.7%37.1%14.0165.67 5712.6Nysted (Rødsand) I
Nysted (Rødsand) II42.5%43.8%7.02075 5902.7Nysted (Rødsand) II
Rønland I48.0%44.5%14.517.2971Rønland I
Samsø37.9%39.2%14.4231 138Samsø
Tunø Knob32.7%30.3%22.15293Tunø Knob
Vindeby (closed)21.7%25.54.95244Vindeby

Calculation method

Just as with the UK offshore windfarm capacity factors, these capacity factors are calculated by calculating, for each turbine in a given wind farm, the number of hours since it was first connected to the grid. This is then multiplied by its capacity, to give the number of peak-MW-hours. These figures are summed across all turbines in a wind farm, and divided into the total energy generated by that wind farm, to give its capacity factor.

Power yield per unit surface area spanned is only calculated for the larger windfarms: when a windfarm is just a single row of turbines, it doesn’t have a well-defined surface area spanned. These yield figures represent 90% of the installed capacity.


ENS register of Danish wind turbines: thanks to ENS and to Energinet.DK for making the turbine-specific data behind this table available. This post gets updated as new data becomes available.

7 Comments on Capacity factors at Danish offshore wind farms

  1. Now:: Capacity factors at Danish offshore wind farms #offshorewind

  2. RT @EnergyNumbers: 40%+ capacity factors at Danish offshore wind farms #offshorewind

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