"You talking about this and at <a href=""https://www.youtube.com/watch?v=OgMXjAQ5q14&amp;t=2m18s"">2:18</a> saying "just drill another one" reminded me of the Kola superdeep borehole. And this being a power plant", I wondered "Could you drill larger holes that deep and use the holes of massive heat as a turbine?". Also, I assume that if you drill too many holes, you'd wind up wasting the Earth's heat, but I don't know how many holes you'd have to drill.