The Substation Behind the Data Centres: Over 200 MW at 150/20/10 kV

A data centre’s power does not begin at its switchgear. Before a single hall can be energized, someone has to design the grid infrastructure that steps transmission voltage down to something a building can use, and at cluster scale that infrastructure is a substantial engineering project in its own right.

TEBIN delivered the civil and electrical basic design for a grid substation of over 200 MW, transforming 150 kV to 20 kV and 10 kV, serving a data centre area in the Netherlands. The work was delivered as design partner to the lead engineering firm, developed fully in Building Information Modelling (BIM).

Why is a substation a civil project as much as an electrical one?

High-voltage equipment imposes demands that are structural and spatial before they are electrical: foundations sized for transformer mass, containment for insulating fluids, clearances that cannot be negotiated, earthing systems that are physically built into the ground, and access routes for equipment that arrives on specialist transport and may need replacing decades later.

That is why the scope is civil and electrical together. Splitting them means the electrical layout is set first and the civil design accommodates it, which works until a clearance and a foundation want the same volume.

What does 150/20/10 kV mean for the site it serves?

Two distribution voltages rather than one indicates a network feeding different classes of load at appropriate levels, rather than stepping everything down uniformly. Transformation stages are where capacity, redundancy, and future expansion are decided, and those decisions are effectively permanent: a substation is not re-laid out later the way a building’s internal distribution can be.

Why does this matter for data centre work generally?

A data-centre campus is a power project with buildings attached. Capacity is agreed with a grid operator years ahead, and the substation is where that agreement becomes physical. A design practice that works on both sides of that boundary can reason about the whole chain, from grid connection through transformation and distribution to the loads inside the halls, rather than treating the incoming supply as a fixed given handed over by someone else.

Project outcome

TEBIN delivered basic design documentation for the substation across civil and electrical disciplines, as design partner to the lead engineering firm. Detailed design, construction, grid connection, and energization remain with the parties holding those scopes.