Date analog: June 10 solar eclipse

On June 10, a partial solar eclipse will occur between 11:20 a.m. and 1:40 p.m., which will be visible in a ring shape especially in the far north of the globe, for example in parts of Canada, Greenland, Russia and over the North Pole. Further south, the portion of the sun covered by the moon will become smaller. Partial coverage will also be observed in Europe. According to Tennet, transmission system operators (TSOs) have been »preparing for the phenomenon for months.«
During the eclipse, solar plants in Germany naturally generate less electricity, while electricity consumption remains constant. Compared to the solar eclipse in 2015, there are more solar plants in Germany today. However, this time the sun will be covered much less by the moon, so generation will decline less, Tennet explains. »So even though there is more solar generation in Germany, there is less missing generation to make up for.«
Because solar plants are spread across Germany, not all are affected equally by the eclipse. For example, at Tennet's corporate headquarters in Arnhem, the Netherlands, there will be about 17 percent solar coverage, while at the site of Tennet's North German transmission line in the Hanover region, it will be 15 percent, and near the South German transmission line near Munich, it will be seven percent.
According to the transmission system operators' calculations, generation from solar plants will drop by a maximum of 4.2 gigawatts. However, Tennet reckons that the TSOs should be prepared for a loss of only around one gigawatt of power. The most important measure for balancing the grid is to increase the control power. To this end, 500 megawatts of secondary balancing power have been put out to tender to increase feed-in, and another 500 megawatts to reduce feed-in. In addition, transmission system operators are tendering 500 megawatts of minute reserve, which they can use to increase feed-in »if necessary« as well.
»Two to three days before June 10, the transmission system operators will assess the situation and analyze the power marketing for June 10 the day before,« Tennet says: »Unlike in 2015, special operating concepts are not necessary - the deviation will not be so large.«
The next partial solar eclipse will occur on October 25, 2022, which will be »similar to the 2015 eclipse in terms of impact and preparation effort,« according to the TCO. For the subsequent solar eclipse on March 29, 2025, Tennet expects »a greater dimming and more severe impact.« This is also due to the fact »that the addition of PV systems in 2025 will be even greater than today.«

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