AFAIU yes, absolutely. Yellowstone has accessible thermal gradients. Even if a remote approach is made, say, outside the National Park boundaries and intended

AFAIU yes, absolutely. Yellowstone has accessible thermal gradients. Even if a remote approach is made, say, outside the National Park boundaries and intended to minimise surface impacts, necessary drilling should be minimal, and a small number of wells should provide far more energy return than a large number of deep boreholes. That said, I'm, ahem, well out of my depth here ;-)