A generator is an outpost which raises the energy cap for a player.
Each generator you control raises the energy cap by 50.
Like all outposts, Generators have shields.
Your energy cap is a number which dictates how many total drillers can be produced by your factories.
The total number of drillers you can produce is 150 plus an additional 50 for each generator you control. Some specialists can modify your energy cap, including the Tinkerer and the Minister of Energy.