I'm on level 5 now, and still safely in greens.
All the different assets available make me reluctant to get rid of too many. (I'm rather looking forward to being able to buy those new assets available to levels 7, 9 & 11.) But I still did use quite a few to upgrade the four city cores I have. Now I think I'm going to stay on this level and save bucks to buy the larger grid before doing anything else, which means I won't be able to join allies until after. Maybe by then, the problem with the reset might be fixed?
Oh, and my level 5 multisource powerplant surges 648 energy, not 700. It's to do with where my political/economic liberty percentage is, I guess? Or the game just doesn't like me. The antimatter reactor town didn't surge 6000 E/3000 all else either. If I click on the asset on the shopping list, it says 6000/3000, but once I bought it and clicked on it to surge, it said 5500ish, I think. I've upgraded it now so can't remember. Anyone know the difference between the level 2 multisource powerplant and level 3 mp? I mean, same name but different numbers and pictures...