I was looking at the formula for Solar Plant, and I put it into a calculator because I was curious.
20 * 21 * 1.1 ^ 21 * (1 - 1 * 0.02) = 3045.9428770566642 is what showed up. My level of Solar Plant is 21, and my planet is the first in the solar system. So 3045 should be my energy from it, but when I click on Solar Plant, it says I get 6851 energy from it.
Is this a bug, or am I working something out wrong?