Reply to post: Re: What's a couple of hundred meters between friends?

Swiss effectively disappear Alps: World's largest tunnel opens

SImon Hobson Silver badge

Re: What's a couple of hundred meters between friends?

> I was also a bit curious why they didn't try to use this heat source...

It's only hot because it's insulated - by the "up to" 1 1/2 miles of rock above it. The amount of heat will probably be quite small and be removed fairly quickly.

That's the problem with geothermal energy - once you start taking heat out of rocks they get cooler. The rate you can take the heat out is limited by the rate at while the heat flows through the surrounding rocks to replenish what you've taken out - and that's generally relatively low for the same reason (that there's a large amount of rock between the heat source and where you are trying to take it out.

TL;DR version - there won't be enough heat to make it worth while.

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