I first constructed a factory that mass produced solar panels, and then I worked on mass fabrication later, Geothermal just simply takes forever to make UU-matter.
and as far as energy condensors go, just set up an anti-matter relay mk3 with several mk3 collectors attached to it and attach it to energy condensor, every spot you can have something connected to it, do it. (Except the back if you are planning on pumping stuff out) I set it up to make more collector mk3 overnight and I came back and there was 38 of them. so I think it works good.