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Why not take from Germany?

> People in Germany essentially got paid to use electricity on Christmas. Electricity prices in the country went negative for many customers - as in, below zero - on Sunday and Monday, because the country's supply of clean, renewable power actually outstripped demand, according to The New York Times.

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The potential shortage would happen during a cold spell, when people in housing with poor heating start using small electrical heaters in large numbers. This tends to happen in neighboring countries at the same time, so the amount of electricity available for import is low at those times.

The negative prices that you quote are very special cases due to wind conditions. The wind doesn't always blow when it is unusually cold.

Also, the power lines used for import have limited capacity, and there has been underinvestment there as well.

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