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dude. you need infrastructure to have your grid deal with the sudden spikes and sudden drops for it to not go up in flames. why do you think those German excess energy dumps regulary end up having negative prices? Because Germany at some point willingly pays its neighbors for not having its own grid black out.

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Germany has the ability to curtail renewables when there's no buyers available for it. They offer low or even negative prices though specifically because it's better for just about everyone than production curtailment.

If Germany's neighbours don't want to buy cheap or negatively priced electricity, they don't have to.

Your understanding of this is poor. First, the same is true with neighbors putting renewables on the grid, it is not just Germany having renewables anymore. But the issue is not that the "grid goes up in flames". In Germany it is mostly that renewables have priority, so are not turned off. This is also not really bad, because it encourages investments into storage.

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