Geothermal power is generally only viable in places where tectonic plates meet. Even there, it costs quite a bit to drill a single well, and with a failure rate of 20% a lot of investors/providers may not think it worth the risk.
Fluids and gases from within the earth may smell unpleasant, and can contribute to acid rain and global warming if released (although modern geothermal plants emit far less than thermal electric plants). Water from deep under the surface can contain nasty things like mercury and arsenic, which also shouldn’t go floating around the environment if we can help it.
According to Wikipedia, geothermal drilling can trigger earthquakes.
As mentioned above, setting up facilities for a geothermal plant is expensive, although maintenance costs aren’t that high.
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