Transformer stations
from study to grid connection

The place where your storage, power plant or site meets the distribution grid. We design the whole station – from the choice of type and location through calculations and the grid operator's requirements to the documentation it is built from.

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200+projects for the distribution grid

EG.D and ČEZgrid connection

ČKAITchartered engineer

Illustration of a kiosk transformer station

WHEN YOU NEED ONE

Larger capacities need a transformer station

From hundreds of kW upwards the grid operator usually requires a medium-voltage connection – and therefore your own station.

01 Storage and solar A battery storage system or PV plant whose capacity makes the grid operator require a medium-voltage connection instead of low voltage.

02 Sites and halls A production site, hall or farm where the existing low-voltage supply is no longer enough.

03 Replacement and refurbishment An old station, a change of transformer rating or relocation of the station because of new construction.

04 New large loads A charging hub, data centre or large heat pump with its own customer substation.

WHAT WE PREPARE FOR YOU

The whole station in one set of documentation

Study and choice of solution Kiosk, masonry or pole-mounted station, transformer rating, number of MV bays, position on the site, MV feeder route, protection zones.

Grid connection application Whether and where the grid has capacity is decided by the grid operator only on the basis of an application. We prepare it complete and correct the first time.

Permit documentation Site plan, floor plans and elevations, technical report, utility statements, documents for the building authority.

Construction documentation Diagrams, station layout, earthing and lightning protection, MV and LV cable routes, short-circuit calculations, protection settings, the grid operator's conditions.

As-built documentation After completion, according to the actual build – documents for the inspection and for the grid operator.

3D visualisation You see the station on the site before it is built. Useful for the investor and for the authorities.

HOW THE PROJECT RUNS

From the first idea to commissioning

The longest part is waiting for the grid operator and the authorities – that is why we file the application as early as possible.

01 Idea and site check Land, zoning plan, protection zones, nearby MV lines and indicative connection options. Within 3 working days you know what stands in the way.

02 Grid connection application We file it for you. In its statement the grid operator confirms the capacity, the connection point and the conditions.

03 Permit Permit documentation and consultation with the authorities and utilities.

04 Construction Construction documentation for the station supplier and the installer, designer's supervision, as-built documentation.

FREQUENT QUESTIONS

What people ask us

How long does a transformer station project take?

The study and connection application take weeks; permit and construction documentation usually 4–8 weeks each, depending on complexity. The longest part is waiting for the grid operator's statement and for the authorities.

How much does a transformer station design cost?

We fix the design fee after the site check according to the station type, rating and length of the MV feeder. Construction costs depend mainly on the station type, the transformer and the distance to the connection point – you get an estimate already in the study.

Can the station be part of a storage or PV plant design?

Yes, and it is the usual case. We handle the station, the storage or PV plant and the grid connection in one set of documentation, so everything fits together and the investor has a single partner.

Do you also design for the grid operator?

Yes – service connections and LV cable lines, over 200 projects. Transformer stations we design for investors: for storage, PV plants and sites, always to the grid operator's conditions.

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Transformer stationsfrom study to grid connection