This shows exactly where the generators are, good luck finding them in the fog.
Cranberry Island Generators Guide
This is near the bunker door. It can be fixed with Copper or Intelligence.
This one is north of the swamp. It can be fixed with Circuitry or Perception.
Depending on amount of fog or time of day, you may be able to see its 3 silos from the first generator.
This one is way off to the west. It can be fixed with Steel or Strength.