From a news report about the govenrment's answer to a question of the AfD:
"In 2009, outage work amounting to 73.7 gigawatt hours (GWh) was caused by feed-in management measures. In 2018, however, it was a total of 5402.7 GWh. In the previous year, the volume was even higher: 5518.0 GWh."
Its about the instability caused in the powergrid due to feeding in the energy from unstable and unreliably varying reneweable energy, namely wind and so9lar. The factor in the change from 2009 to 2017/2018, is roughly 74.
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