Optical rectennas for late game solar collection.

[Strawberry]

Optical rectennas would be cheaper to produce, far more efficient, and use easier to obtain materials, there's one catch though, the manufacture of these requires nanoscale technology that we do not possess yet. Optical rectennas seem fitting as an upgrade for solar power generation, that while a straight upgrade to normal solar panels, come at the cost of needing additional research, and higher capital investments to produce, meaning that colonies cant build them from the get go.