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Daily cycles Germany

 

The figure shows the timing of the wind power fed into the grid on extreme days in 2017 and highlights the special situations and power fluctuations to which the grid is exposed. The absolute highest value of wind power to date was reached on 28th October 2017 with 43,546 MW between 9 pm and 10 pm. The day with the highest average wind power (39,190 MW) over 24 hours was observed on 24th December 2017. Particularly high values were measured, favoured by a low-pressure system with high wind speeds and a large spatial expansion. The average output of the »Wind Farm Germany« is 12,275 MW. 3.2 times the average daily output was generated on 24th December 2017, with a corresponding energy yield of 940 GWh. Based on the share of wind power in the grid feed-in, Germany ranked second in Europe with 71 percent on this day. Denmark was the leader on this day and was able to cover 98 percent of its electricity requirements by feeding in wind power. Across Europe, the average was approx. 22 percent [Wind Europe]

 

 

 

Extreme diurnal variations of wind power feed-in into the German grid 2017, based on quarter-hourly extrapolations of the wind power and the development of the electricity price on the EPEX Spot auction market for these extreme days

Data sources: [Hochrechnung 50Hz][EPEX]

 

 

The day with the lowest wind yields was 22nd September 2017. With an average output of 755 MW, corresponding to 6 percent of the average daily output, only 18.1 GWh of wind power was fed in on this day. The maximum absolute increase in wind power within one hour was measured on 17th May 2017. From 8 pm to 9 pm, wind power rose by 4,521 MW to approx. 16,558 MW, which corresponds to a power increase of around 38 percent within one hour.

 

The opposite behaviour and a very strong decrease in power was observed on 30th July 2017. Here, wind power dropped by 5086 MW from 6 pm to 7 pm. Shortly before the sharp drop in power, the six-hour rule came into effect within seven hours. With the start of the negative electricity prices on the spot market at 10.00 am, no market premium was paid for the direct marketers until 5.00 pm. The lowest value for electricity on the spot market was reached on 29th October 2017. It was -8.3 ct/kWh.

 

The influence of the feed-in from wind and other renewables is partly reflected in the development of stock exchange electricity prices over time. Thus, on 30th July, a strong feed-in of photovoltaics was recorded, together with the negative electricity prices [Agora Energiewende]. The day with the lowest electricity price is also associated with a low-pressure system. Nevertheless, factors that influence pricing are complex and not exclusively attributable to individual producers.