There are already engineering plans to relieve the eruption. NASA has commented that a Super Volcano are a bigger threat than asteroids.
> But if more of the heat could be extracted, then the supervolcano would never erupt. Nasa estimates that if a 35% increase in heat transfer could be achieved from its magma chamber, Yellowstone would no longer pose a threat. The only question is how?
http://www.bbc.com/future/story/20170817-nasas-ambitious-pla...
http://maps.unomaha.edu/peterson/geog1000/maplinks/namerica/...
Of course, then one has to wonder if that sort of interference in major geological processes will have some other bad side-effects in the future.
Some of my most vivid childhood memories are of a trip there. I don't remember much else about the trip but can still picture the amazing kaleidoscope of color and recall the smell of sulfur.
Endless free energy?
I guess you could transfer enough energy out from the borders of the chamber without affecting the rest of the place too much.