A Package Substation is a fully integrated close-coupled system, which can save time, space and money when compared to a de-coupled system. The connections from a remote transformer may require a lengthy cable or bus bar runs to reach the LV Switchboard, which can be expensive. Situating a cast resin transformer directly next to a suitably rated switchboard might be an attractive option.

Package Substations are an efficient option to select when a large amount of power is required to feed a site with distributed LV especially when the customer site has access to a suitably rated high voltage power supply. This high voltage power supply is usually fed from a Distribution Network Operator (DNO) owned and operated sub-station or as stated above, a site owned HV Network, depending on the situation.