I am playing this game on the kongregate web-site and am at the last planet. Although I can win fairly easily, I don't understand the stats

The stats are:
Energy
Collection
Depletion
Deficit
I (so far) have simply played by placing collectors and then a couple of blasters. Then I slowly migrate towards those blue fountains (where the water comes out) and place a blaster next to them to stop the water from coming out. In the mean time I generally place about 5 red diamonds or so to speed things up.
Could someone please explain what energy does? I always have 0/20. After I build a couple of those green diamonds I get 0/40, then 0/60 etc.
PS
I checked the in-game help, the wiki page, and this forum but didn't find what I needed.
Sorry, I guess I'm a dummy
