Comparisons are meaningless because both geothermal and nuclear heat water to steam. It just depends on the size of the resources in the plant. There are many elements to this that make comparisons silly at this young stage in widespread geothermal implementation.
The tiny amount of underbuilt, largely "experimental" geothermal plants around (there are more than eight just in California BTW), don't produce as much as nuclear because, like experimental nuclear plants when they first were tried, are small.
We need to remember that both plants use simple steam to make turbines spin to produce a current. If you take that into account, if we compare an older, less efficient nuclear reactor to a geothermal plant that has multiple water-to-steam loops running muliple turbines, a plant the size of a nuclear plant may produce more power with geothermal. Certainly when you weigh all the factors of the power sources that are being tapped to just produce steam, geothermal is the winner hands-down in terms of cost to MW of production. If you're going soley on cost to MW, you cannot beat geothermal with any other type of energy-generation source around.
That's just cost in $$ of mining coal or uranium, worker deaths, illness, compensation claims, widow's benefits, and transportation. All geothermal "resources" are at-site from the get-go. And the working conditions are the safest among all sources to produce energy.
When you start talking about cost in safety to US citizens, things really start looking scary. Nuclear power is no simple laughing matter to be brushed aside. Radiation is dangerous, deadly and insidiously prone to hang around for generations as a high-risk, lethal substance. Why the frick would anyone choose this method of producing steam when the same steam taken from non-lethal sources could suffice?
We only need to develop geothermal's potential to replace nuclear for steam. We just haven't done that. It's been out there, a 100 million + times more steam than 1,000 nuclear reactors' lethal radiation could produce, just sitting in the West, unused... In some cases boiling right out of the ground at surface.
