overview

Fourth HVDC converter station for SGS: Electrical installation at the SuedLink converter station in Brunsbüttel

Industry

Energy

Status

In progress

Country

Brunsbüttel, Germany

Services

Construction management & supervision, Electrical installation, Project management

Experience that builds trust With the Brunsbüttel HVDC converter station, SGS Industrial Services is already delivering its fourth project of this kind for Siemens Energy on behalf of TenneT Germany. Following the projects in Wolmirstedt, Isar and Großgartach, Brunsbüttel marks another milestone in the expansion of Germany’s energy infrastructure. Around 90 experienced specialists from SGS are undertaking the complete electrical installation of the plant, thereby making a significant contribution to the successful implementation of SuedLink.

Staff in action

Months of construction

300

km of cable

Large transformers

Project data

Commissioner: Siemens Energy Global GmbH & Co. KG
Customer: Tennet TSO GmbH
Industry: Energy
Construction location: Brunsbüttel, Germany
Contruction period: 12 months
Contributors: At its peak, 90 people

Scope of delivery & service

Electrical installation at the HVDC substation in Brunsbüttel

Scope of electrical installation:

Site management & equipment for 12 months
Equipment for transport and lifting
Installation of:
- HVDC converters, transformers (including oil filling), AC/DC equipment and cooling systems
- C&P cabins & system
- Ancillary facilities
- Mains and control cable installation, cable trays
- Lightning protection, parts of the earthing system
- Steel support structures
- Busbar/connection work

Our range of services in Brunsbüttel

Since February 2026, SGS Industrial Services has been responsible for the complete electrical installation of the HVDC converter station. Over a period of 12 months, our specialists are working on the assembly and connection of all electrical components – from the converter to the substation.

Our scope of work includes:

Installation of the converters, cooling systems and high-voltage equipment
Installation of seven transformers, each weighing 484 tonnes, including oil filling
Laying of around 300 kilometres of cable, as well as earthing bars and earthing cables
Erection and connection of C&P cabins and systems
Installation of ancillary equipment, steel support structures, lightning protection and parts of the earthing system
Installation of power and control cables, as well as busbar and connection work for subsequent commissioning.

Experience as a key to success

Brunsbüttel is already the fourth HVDC converter station that SGS Industrial Services has installed for Siemens Energy. This trust is based on successfully completed projects, high-quality workmanship and a team that delivers even challenging large-scale projects safely and on schedule.

With around 90 qualified staff, SGS brings together extensive experience from international energy projects. Precise planning, well-coordinated processes and high quality standards ensure that even complex installation work is carried out efficiently and reliably.

Challenges and distinctive features

The size and technical complexity of the converter station place high demands on planning, logistics and execution. All work must be closely co-ordinated to ensure that the various trades work together seamlessly.

Particularly challenging tasks include the installation of the seven transformers, each weighing 484 tonnes, the laying of around 300 kilometres of cable, and the installation of the extensive high-voltage and control systems. Thanks to the experience gained from three previously successfully completed HVDC projects, SGS possesses the necessary expertise to overcome these challenges safely and efficiently.

SuedLink – The backbone of the energy transition

The Brunsbüttel HVDC converter station forms part of SuedLink, one of the most important infrastructure projects of Germany’s energy transition. The direct current link, which is around 700 kilometres long, will in future transport wind power from northern Germany to the south and can simultaneously transmit energy in the opposite direction. With a transmission capacity of 4 gigawatts at a voltage level of 525 kilovolts, SuedLink helps to reliably integrate renewable energy into the German electricity grid and ensure a secure long-term electricity supply. The project is being carried out by TenneT Germany and TransnetBW.

With the successful completion of the Brunsbüttel converter station, SGS Industrial Services is making a further important contribution to the expansion of the energy infrastructure and underlining its position as an experienced partner for challenging HVDC projects.

About our client, Siemens Energy

Siemens Energy is one of the world’s leading companies in energy technology and renewable energy. Siemens Energy’s product portfolio covers everything from power generation and transmission to storage.