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Feed-in Management


Under certain prerequisites the responsible grid operators can temporarily throttle the supply from wind turbines in order to prevent overloading the electricity grid. The energy that is then not produced is designated as forced downtime energy. Before a grid operator throttles any wind power he must ensure that this is the only alternative and that he cannot reduce any grid overload using conventional power plants. Feed-in management data is published by the BNetzA in the autumn of the following year, which is why this section only considers the data up to the end of 2017.





Forced downtime energy and the proportion of throttled wind energy with regard to the total wind energy yield and compensation sums

Data source: [Bundesnetzagentur and Bundeskartellamt]



As can be seen in the figure, the forced downtime production loss in 2017 increased when comapred to the previous year from 3743 GWh to 5518 GWh and has so reached the highest value up until now. 95,8 percent of the throttling of renewable energy generators in 2017 affected wind turbines, whereas in 2016 this was only 93,5 percent. The highest concentration of this was in the northernmost federal states Schleswig- Holstein, Lower Saxony, Brandenburg, Sachsen- Anhalt and Mecklenburg- Vorpmmern with 96,2 percent. The proportion of throttled wind power of the total wind power production in 2017 was 4,8 percent, which shows an increase of 47 percent when compared to the previous year.

The reasons for that are complex. Firstly, the conisderable wind energy potential that was present during 2017 needs to be taken into account. In addition to that, there exists an increasing amount of throttled off-shore WTGs. However, an easing of the grid situation is not to be expected during the years to come. The increased amount of forced downtime emphasizes the necessity for omtimization measures that need to be imediately implemented in order to continue with the expansion of wind power capacities.