Turns out all the assumptions for the economics of geothermal were based on 20+ year old data. With the advances applied from oil/gas, geothermal is squarely back in the economic region of renewables.
It took them 72 days to drill their injection well to 11220 ft. 59 days to drill their production well to same depth. So from their 1st well to their 2nd, they've already improved 18%. Oil/gas drillers can do 11220 ft wells within a couple days.
Sure 3.5 MW isn't a ton but this was literally a proof of concept. They can expand by orders of magnitude by drilling hundreds of these injector/producer doublets. They could probably get 2-3x more power per well after optimization. They can easily control production by altering the injection rate. I forget the exact delay but basically, if they ramp up/down injection, they see the same exact response on the production side a couple hours later. They expect to be able to combine this with solar/wind to get a firm 24 hour renewable base load.
16 page Fervo white paper with tons of data (pressure, temperatures, geologic setting, frac plans, etc) - https://eartharxiv.org/repository/object/5704/download/11142...
Note that they do monitor induced sesmicity and have green/yellow/red light system for when to stop if necessary. Again, this was for the proof of concept with the Department of Energy.
Edit: with the exception of the high temps (376F max recorded), the drilling is all very standard oil/gas style that happens all the time across the US. 376F isn't unheard of in deepwater offshore but it's damn hot.