0.55 volts. Would this be enough to use for electricity generation (visualising some large, multi-thousand-kilometer cable pole-to-Europe/Canada, for example?) What is the amperage, what could this reasonably be used for?
Still, don't hold your breath. We have this awesome geothermal temperature gradient, with hot rocks underneath us if we just dig down a few kilometers, occasionally less. Unfortunately, it's only cost effective to use in a rare few places.