overview

With SGS into the energy future – installation of the HVDC converter station in Leingarten/Großgartach

Industry

Energy

Status

In progress

Country

Großgartach, Germany

Services

Construction management & supervision, Electrical installation, Projektmanagement

The energy transition is one of the greatest technical and social challenges of our time – and SGS Industrial Services is actively shaping it. By installing the HVDC converter station in Großgartach (Leingarten), we are significantly contributing to Germany's secure and sustainable power supply. This project is part of SuedLink, a vital connection between the wind-rich north and the energy-intensive south. SuedLink is being jointly planned and constructed by the two transmission system operators TransnetBW GmbH and TenneT TSO. TransnetBW is responsible for the southern section and the converter station in Leingarten. Our SGS team has been working in Großgartach since the beginning of 2025, with a follow-up order for the installation of a state-of-the-art HVDC converter station. We have already successfully installed a similar system in Wolmirstedt. The trust that our customer, Siemens Energy Global GmbH & Co. KG, has placed in our work has led us directly to the next major project.

Project data

Commissioner: Siemens Energy Global GmbH & Co. KG
Customer: TransnetBW
Industry: Energy
Construction location: Großgartach, Germany
Contruction period: 12
Contributors: 90

Scope of delivery & service

Electrical installation of the HVDC station in Leingarten/Großgartach.

Scope of electrical installation:

Construction site management & equipment for 12 months
Equipment for transport & lifting

Installation of:

HDVC-converter, AC/DC-Equipment, transformers incl. oil filling and cooling system
C&P cubicles & system
Auxuliary power system
Power & control cable installations, cable trays
Lightning protection, parts of grounding system
Steel support structures
Bus-/ connection work

Our Scope of Services in Großgartach

We are responsible for the complete electrical installation of the HVDC converter station – from the converter to the substation. This includes:

Installation of converters and cooling systems, including HV equipment
Assembly of seven transformers (484 tons each), including oil filling
Laying of approx. 300 km of cable, grounding rails, and ropes
Construction and connection of C&P cabins and systems
Installation of ancillary equipment, steel support structures, lightning protection, and parts of the grounding system
Power and control cable installation as well as bus/connection work to ensure smooth commissioning

Over the course of twelve months, approximately 90 of our specialists will leverage state-of-the-art technologies and meticulous planning to ensure timely completion.

Technological excellence and professionalism

The installation of an HVDC converter station requires the highest precision, coordination, and technical expertise. SGS Industrial Services stands for quality, safety, and efficiency.

With projects such as Großgartach, we prove that SGS Industrial Services is a reliable partner for complex energy infrastructure assembly projects. Our team delivers results that set standards – technically, organizationally, and in terms of scheduling.

Andreas Hofinger

Managing Director, SGS Industrial Services

SuedLink – future-proof power supply

SuedLink is the key infrastructure project for Germany's energy transition. The transmission system operator TransnetBW is responsible for the southern section and the converter station in Leingarten. In the future, two 700-kilometer-long direct current lines will transport wind-generated electricity from northern Germany to Bavaria and Baden-Württemberg. HVDC converter stations convert alternating current into direct current and vice versa in order to transmit energy over long distances with low losses.

Length: approx. 700 km
Capacity: 4 GW
Voltage level: 525 kV
Supply: around 10 million households

SuedLink is crucial to ensuring a stable, sustainable, and independent electricity supply in the future. It connects the windy north with the energy-intensive south.

About Our Customer: Siemens Energy

Siemens Energy is one of the world's leading companies in energy technology and renewable energy. Its product portfolio covers the entire energy value chain, from generation and transmission to storage.