Different calculation specifications
Since January 2015, the calculations underlying the data presented here have been based on different methodological guidelines to those previously used:Up to and including 2014, the online estimate of actual electricity generation from onshore wind energy was published using the total electricity feed-in generated nationwide and marketed by the transmission system operators (TSOs) or by direct marketers.
Since 2015, the extrapolation in accordance with Annex 1, Section 5.1 (relating to Section 23a) of the EEG has been published instead: The online projection is based on a representative number of measured reference installations and, in accordance with the wording of the Act, reflects the ‘quantity of electricity actually generated’, in this case the output-dependent quantity from onshore wind turbines at quarter-hourly intervals. Reductions in the feed-in power of the installations on which the projection is based are therefore not taken into account in the projection: electricity volumes that were not generated due to a remotely controlled reduction in feed-in power by the grid operator or the direct marketer are nevertheless included in the online projection.
A comparison of the figures before and after the turn of the year 2014/2015 is therefore only possible to a limited extent and must take into account the different calculation requirements set out in the respective underlying EEG.
Note on the provisional nature of current data
The operational figures represent provisional data for the respective month. As part of the market value calculation, the projection is reviewed again and, where necessary, corrected, before being published as a quality-assured online projection at the start of the following month.
The business extrapolations can be downloaded at any time, either via the application programming interface (API) or here. The quality-assured figures are only published once the market values have been released. They can then be downloaded immediately.