What kind of civilization is possible on intermittent power ? All western civilization is built on 24/24 7/7 available energy (from direct use of petroleum or electricity). I think we should give two numbers: the raw TWh output and the stable TW output and see where they are coming from. Africa and Asia are rapidly being electrified, but if it does not create an industrial boom outside China by guaranteed available energy it's just more people having intermittent AC and not real development.
A civilization that uses storage to level that intermittency. It's perfectly possible to power industrial world civilization using only renewables, and it would be cheaper than trying to do it with fission (which would require breeder reactors, btw.)