I think you’re getting cause and effect wrong.

Previously Sweden was much tighter coupled to German prices, but since fossil fuels were cheap people didn’t really notice.

Today due to CO2 cap and trade fossil emissions are expensive. [1]

Couple it with a massive renewable buildout leading to a decoupling of the prices that didn’t happened before.

We now have maximum volatility. Jumping between expensive fossil prices and an absolutely mindbogglingly large surplus leading to essentially free energy.

As Germany, and the rest of Europe, transitions to renewables we will spend less and less time on fossil fuel marginal prices and see our energy systems stabilize on renewable and storage prices. Outside of emergency reserve style situations.

[1]: https://en.wikipedia.org/wiki/European_Union_Emissions_Tradi...