The Mobile substation is a well-equipped substation which is installed on a trailer and is comprised of Power and Earthling / Auxiliary Transformers HV and MV Switchgears, Measuring equipments, in addition of a container enclosed AC & DC, Control, Protection, and Measuring Panels, with Cable reeling equipment (Optional). Factory – made mobile substations of Sane Shargh Co. can be provided with either AIS (Air Insulated Switchgears) or GIS (Gas Insulated Switchgears) The mobile substations have obvious advantages: Flexibility in transportation regardless of the place. These mobile substation completely can be transported where it is required. Short term installation and commissioning, considering the workload is less than conventional substations, therefore installation and commissioning will be implemented in a short period of time, therefore it will be cost beneficial.