Germany’s offshore wind capacity factors

Posted by – 2019/03/01

Previously I’ve provided the figures for Danish offshore windfarms, for the UK , and for Belgium too. Here are the numbers for the larger German offshore windfarms. The ones shown here are the only ones I’ve been able to get detailed data for, so far, and my main source is no longer freely available, so updates here will be very limited. If you know of additional data sources, please let me know on Twitter.

German offshore wind capacity factors

All numbers are to the end of August 2018. Analysis by
Age (y)Installed
elec. gen.
Power per
unit area
spanned (W/m2)
Rolling 12-month
capacity factors
Total40.2%39.2%312822 7072.9
Amrumbank West41.9%42.4%2.93023 0813.9
Bard Offshore 136.9%34.5%1.44001 6792.3
Borkum Riffgrund I35.4%39.0%2.93123 0833.4
DanTysk46.0%48.2%3.32883 4162.1
Gode Wind I38.9%37.8%1.33301 3753.1
Gode Wind II39.2%37.9%1.32521 0533.2
Nordsee One27.4%0.7331534
Nordsee Ost 133.7%34.8%3.31441 4452.8
Nordsee Ost 235.0%35.4%3.31441 4782.8
Sandbank46.4%44.5%1.62881 7942.7
Windpark Baltic 1 & 244.6%45.0%2.83363 7674.1

Load duration curves

I’ve constructed for each of the offshore windfarms for which there is detailed hourly data. Use the pause and play buttons to stop and start the sequential display of curves. Click on the windfarm name in the legend to toggle the display of that farm’s curve.


Note that for each individual windfarm, its curve is based on data starting from the date that the windfarm was fully commissioned, and the windfarm’s age is calculated as starting at that date. There is one exception: the Bard Offshore Windfarm was fully commissioned in August 2013, but detailed data on its generation is only available from spring 2017 onwards – so the “age” shown for this windfarm is the age of the oldest available data, not the age of the windfarm itself.

The numbers for DanTysk did look strange: I had to clean a stretch of five months of data that was clearly wrong. A small kink remains in its load duration curve; this may be an artefact of a small amount of remaining problematic data.

Windfarms less than a year old are excluded from the calculations of the power density per unit area spanned. The figure for total power density is a weighted average of the windfarms that are a year older or more: this is weighted by size, but not by time. So a windfarm that’s twice as large contributes twice as much to the total; whereas a windfarm that’s twice as old, does not.