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The biggest natural fission reactor is in the earth's molten core. It is in fact molten because of fission and is still heating up slowly. I haven't heard numbers, but I bet they are known because the size and temperature of the core and the insulating value of the crust are known.
Although at first sight tapping the internal heat of the Earth with geothermal power plants would seem to be the greenest of power sources in practice it does not always work out.There is always the problem of releasing various noxious gasses that can be hard to control.
According to Wiki the heat generated by radio-active decay is 30TW.http://en.wikipedia.org/wiki/Geothermal_gradient.