On what timescale? Over even just a few second timescale you are cooling rock, but digging deeper gives higher starting temperatures and more volume to remove h

On what timescale? Over even just a few second timescale you are cooling rock, but digging deeper gives higher starting temperatures and more volume to remove heat. So, dig far enough and you can get an above some temperature an arbitrary long period say 100 years. Given your geothermal power plant operates for 100 years and pulls from say 1w/m2. Then you move to a new location for 100 years, and then come back you’re limited to 1w/m2 + 1w/m2 = 2w/m2. Have not 2 locations but many and eventually you’re fully recharged.