My preffered tactic here:
There's a particularly advanced Bastard strategy, best done with a team of two Bastards, in which you deploy a turret somewhere important to the enemy - like a spider clamp turret in the generator room, say. Then the other Bastard, who's standing somewhere far away and perfectly safe, immediately takes control of the turret via the command interface. In the generator-room permutation of this tactic, the turret-deploying Bastard blows up the generators with the help of the human-controlled turret, and heads off to have fun elsewhere. The other Bastard sits and waits.
Sooner or later, an enemy repair guy will show up and fix the generators. The turret-controlling Bastard does not shoot this fine team player. He waits for him to go away.
Then he disables the generators again, with turret fire. A single spider clamp turret takes a while to kill a generator, but it can do it. You don't have to actually blow the generators up; they stop working when the oscillating stuffs on the front stop moving. Stopping shooting the generator then saves time, and also saves your turret from getting damaged by the exploding-equipment blast.
With the generators disabled again, back will come the angry repairer, scouting around to find the base-raper that he presumes must have done the deed. He'll fail to find anyone, almost certainly fail to suspect the apparently completely inert spider clamp turret hanging on the wall (or high on the ceiling, by preference), and he'll fix the generators and go away again. And shortly afterwards discover that all of the lights are out once more.
pro-tip:wait for him while controling the turret so the turret won't shoot him automatically and won't be spotted.