Comparing worst capacity factor (for cited reasons) with best CF without saying it is offshore in some of the best location is misleading. Also is comparing dispatchable and intermittent/fatal. There a other factors to consider like reserve ratio, or how the production can cover the power needs over the year, it gives hints at how you need to scale seasonal storage.

I see, thanks. 50% isn't that much of an outlier, though, as the average over both onshore and offshore farms seems to be 42% for younger projects: http://css.umich.edu/factsheets/wind-energy-factsheet