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by Lisdexamfeta 744 days ago
Utah FORGE is the deepest I'm aware of: https://utahforge.com/project-research. Well 58-32 goes to 2.2km. 78B-32 goes to 2.9km. 16B(78)-32 appears to break 3km.

But FORGE is mostly based around research, from what I understand, rather than rolling out broad-based commercial geothermal.