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They found some potential geothermal wells near where they were previously mining.
Title makes it sound like a new method of generating energy was discovered, but really the article is about using geothermal in a new location.

> The development of medium-deep (>400 m) and deep geothermal reservoirs (> 1,500 m) could be a partial solution to provide renewable heat to single buildings, residential or commercial neighbourhoods, or districts of the city of Aachen via the existing district heating network.

Hopefully Germany doesn't ban geothermal like they did with nuclear and fracking
Opening survival north stream single pipe for Russian gas is no brain solution. Europe break records importing relabeled Russian gas last month anyway
I have always wondered about the origins of the anti nuclear opinion of Germans.

It has Cold War origins to be sure, but what kind?

I suspect American intelligence has been supporting the anti nuclear movement for some time, for non-proliferation reasons - and not just in Germany. I certainly would be, if I ran the State Department.

Geothermal is great, but it's not new. Is this just a misleading headline?
I thought they found vibranium. Shame…
"Staufen darf nicht zerbrechen!"
curiousity question: does removing the heat from a geothermal well create unintendeed side effects?
Unlikely. If we are able to pull too much heat from crust it will make those geothermal plants inoperable (due to too low temperature), in that localized spot, long before we are able to impact wider area or deeper layers.
Here a German podcast episode not about this publication, but in general about geothermal power in Germany: https://erdeumwelt.podigee.io/11-erdwarme

If you speak German it's very interesting. Sounds like we should build more geothermal power plants.