No worries until the next bitter wave comes, and oh my god there are 20 behemoths and holly crap this drawing a lot of power, wait why am I experiencing a brown out? Oh no.....my coal mines are electric powered on the same grid as the turrets and the buffer is low......They made it through the wall.....They are destroying the base including the coal mines......Time to start over!
This is why you have a separate defense grid, and a capacitor farm to serve defense demand, and when the capacitors run low you have a logic network to read the value of `A` (accumulator fill %) and turn off everything that isn't critical (mining, etc). (Of course, you'll need this switch at any satellite installation too.)
You may need to shift-click some electric poles to disconnect them from other poles, and use copper wire to connect them exactly how you want.
Add a lowkey alarm buzzer (the speaker) to let you know this is going on. Try to have a second, louder one that detects whether it's failed and the factory is still on because of a short circuit. Conduct tests by wiring in a constant combinator outputting a fixed value of A (possibly negative).
