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>you can't really add new rivers to the geography to support additional industry.

yes, you can - with all those fiords surrounded by mountains you can use excess wind/solar (your own as well as German, etc.) and pump water up a dammed fiord to generate the electricity later when no cheap excess available.

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Well, we don't have fjords or mountains in Sweden, otherwise a great plan.

There are both mountains [0] and fjords [1] in Sweden, but not of the Norwegian kind they were probably picturing.

[0] https://en.wikipedia.org/wiki/Scandinavian_Mountains

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

Build a dam in the fjord and pump the water out from it with excess electricity! Profit

This assumes that there is excess power at some point. This will soon become unrealistic: we either need power for data centers during the day or charging vehicles during the night.

The solution works only to keep a steady production of electricity, but if the demand would require full output all the time then these "mechanical batteries" don't help.

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