|For the vault management resource in Fallout Shelter, see Power.|
Generated power is used to operate anything that needs electricity, including lights and defense turrets.
Quite intuitively, power comes from generators that are built using the workshop interface. They have their own, separate category and range from small to huge. Surplus power is usually a good idea. A little less intuitively, though logically, in order to power up any device that requires a power supply, the player needs to hook it up to the generator using wires. Each wire costs 1 copper unit, regardless of length. Distance is limited and power pylons and relays - or multiple generators - may be required to power larger grids.