Responding specifically to the competition with nuclear: you're absolutely correct: the Geysers geothermal complex (which is actually about 22 power plants) is

Responding specifically to the competition with nuclear: you're absolutely correct: the Geysers geothermal complex (which is actually about 22 power plants) is about 1.6GW. That's easily the world's largest though: I don't think there's another one over a gigawatt anywhere. And you need really special conditions for that kind of power - specifically really hot geological conditions. The problem, as always, is that jerk Carnot and his limit. Most accessible geothermal fluid is <150C except in very geologically active areas. That puts a pretty hard limit on plant efficiency.