Yeaa, gotta almost plan on 1 level of power for each level of mines. On my planet in Uni 1 I have:

Level 15 Metal
Level 12 Crystal
Level 13 Deut
Level 16 Solar

Plus I have a couple of solar satelites up and a level 3 Fusion plant and I'm still in the negative on energy. -189/1.712

Cost to upgrade the solar plant to level 17 - Requires: Metal:49.263 Crystal:19.705. Yeoouch.