Hum, thanks, but I had figured the part where the power station & the command station merged, and that the old 3 levels were replaced by one years ago...
I asked if it posed a problem, because, the additional "eat-metal" power generator are currently here to stay, but... the fuel mechanics does takes the place of whatever role it could take, as stated in the design doc, see section :
2.d. Power for Stationary, Fuel for Mobile
Did you read that part ? It's stated there that old energy mechanics would work as before, but as energy is per planet, my guess is that Chris either didn't think it completely, or that he specifically wants matter convertors to eat metal being placed ON the very planet there's a chokepoint on as separate unit, in order to allow the possibilities of a brown-outs. Of course, as sestren stated above, there's little point if they're all clumped under one forcefield.
Now... for the proposal...
Merging the command station & the energy production (variable, or not) would mean that until the command station's dead, brownouts can't occur, but then again, whatever's defending the command stations probably will defend energy production.
Hence the question... Do you need to have, somehow, variable energy provided completely by command station ?
I'm personally fine with a raid starship / infiltrator disabling some defenses by shooting a matter convertor on a front line. Not so much if my entire defenses littelrally get shot when a single building gets shot.