Cape Station, future home of an enhanced geothermal power plant, in Utah

This provides a lot of interesting info on geothermal: https://worksinprogress.co/issue/watt-lies-beneath/

And more: https://www.complexsystemspodcast.com/episodes/fracking-aust...

One interesting point made here is that the cost of turbines puts a floor price on any form.of generation which uses them, whether renewable or not, meaning in the long run solar has a big advantage: https://www.dwarkesh.com/p/casey-handmer. I don't know how accurate that is

Kinda. We have a lot of existing coal plants that we want to offline to decarbonize, and they've already got turbines.

How hard is it to repurpose those turbines for other sources? And are they in good enough shape to get a long life out of them after being repurposed?

I don't know -- I'm far from an expert on this -- but ultimately they're both steam-driven turbines.