White Paper – How windy was 2018?


The wind index, as calculated by 3E, is a useful tool to show the wind potential of a certain period compared to the long-term average. The analysis is based on the ERA5 reanalysis dataset and covers the full year of 2018. The results have demonstrated that last year was windier than 2017, but still below average.

3E’s approaches to wind index

3E follows two distinct approaches to assess wind index (WI). The first approach is called the “Cumulative” wind index. It compares the wind performance of a certain month to the average wind performance calculated between 2000 and 2018, which is the reference period. The second approach is called the “Short-term” wind index. It shows the wind performance of a given month compared to the average performance of the same month between 2000 and 2018. The main difference between the 2 approaches is that the second one eliminates the effects of seasonality and is rather used to look at the performance of a specific month.

Interested in our 2018 wind performance analysis? Click here for the full paper.