From Site Selection to Commissioning: Inside the Lifecycle of a 765 kV Substation Project

A 765 kV substation is one of the most complex and vital elements in Saudi Arabia’s power network. But have you ever wondered what really goes into building one — from the first survey to the moment it’s energized? Let’s take a look inside the fascinating lifecycle of a 765 kV substation project.

It all begins with site selection and feasibility studies. Engineers identify locations with stable soil, easy access, and minimal environmental impact. In Saudi Arabia, this often means working around desert terrain, saline soils, and extreme temperatures — conditions that require careful planning. Once the site is finalized, the design team prepares the layout, busbar arrangement, and foundation plans based on Saudi Electricity Company (SEC) standards.

Next comes the construction and erection phase. Civil teams handle foundations, control buildings, trenches, and drainage systems, while electrical teams install massive transformers, gantries, circuit breakers, and control panels. Every activity is planned with precision — from concrete strength testing to conductor alignment and earthing grid installation. Safety and quality inspections are part of every stage.

Then comes testing and commissioning, the most critical part of the project. Engineers perform insulation checks, relay coordination, cable testing, and trial energization before the substation goes live. Once the system passes all functional and safety checks, the project is officially handed over to the client for operation.