Looking at the upper limit of production potential, there would...

Looking at the upper limit of production potential, there would be 50-60 production wells required @ ~$5 million per well, plus an undisclosed number of injection wells, possibly upwards of 50?

Roughly speaking, looking at about 100 wells for for a 400MW geothermal power plant @ $5M gives a well capex of about $500M.

The market seems to like this figure.....