The Large Substation is a larger version of the Small Substation. The range and size of this substation is approximately double the size of its smaller counterpart. The Large Substation otherwise acts identically to the Small Substation in its role as a mandatory building used for powering buildings within its range. It must also be connected by pylons to a power station.
The Large Substation is not available to build during the Nublar North section of the Claire's Sanctuary DLC. However, the player is granted access to a single, pre-placed station for use during this section.