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North Sea Link
North Sea Link
The North Sea Link (NSL) is a 720-kilometer subsea interconnector that connects the electricity systems of Great Britain and Norway, making it the world's longest subsea interconnector. Jointly operated by Statnett and National Grid, NSL allows the bi-directional transfer of up to 1,400 megawatts of electricity, supporting security of supply and enabling the exchange of renewable energy between the two countries.
North Sea Link utilizes high voltage direct current (HVDC) technology, featuring advanced converter stations at both ends to ensure stable and efficient power transfer between the grids. The HVDC system is essential to linking the UK and Norwegian grids across such a long subsea distance, enabling the reliable integration and trading of renewable energy resources.
North Sea Link
Dogger Bank Wind Farm
Dogger Bank Wind Farm
Dogger Bank Wind Farm is the world's largest offshore wind farm, located more than 130km off the North East coast of England with a capacity of 3.6GW, capable of powering up to 6 million homes annually. The project is being constructed in three 1.2GW phases known as Dogger Bank A, B, and C in the UK's North Sea waters.
Dogger Bank Wind Farm has implemented high-voltage direct current (HVDC) transmission system, marking the first-time use of HVDC technology on a UK wind farm, which allows power from the offshore wind farm to be efficiently transmitted to the UK's national grid.
Dogger Bank Wind Farm
Slovenská elektrizačná prenosová sústava
Slovenská elektrizačná prenosová sústava (SEPS)
Slovenská elektrizačná prenosová sústava (SEPS) is the national transmission system operator for electricity in Slovakia. The company is responsible for operating and developing the country’s high-voltage transmission network, ensuring secure and reliable electricity flow, and connecting the Slovak grid with neighboring European systems.
SEPS invests in cross-border infrastructure and has strengthened its transmission capacities, but there is no specific public record of SEPS currently operating or developing HVDC (High Voltage Direct Current) projects; its activities focus on AC interconnections within Continental Europe.
Slovenská elektrizačná prenosová sústava
Ariadne
Ariadne
Ariadne Interconnection is a wholly-owned subsidiary of the IPTO Group, established in September 2018 to implement major energy infrastructure projects in Greece. The company was created specifically to construct and finance the electrical interconnection between Crete and Attica, marking the largest electricity transmission investment in Greek history and a significant move toward greater energy reliability and sustainability.
In HVDC, Ariadne is responsible for the Crete-Attica interconnection, which is among the most advanced projects in Europe, featuring two 500 kV submarine HVDC cables (1,000 MW total capacity) and state-of-the-art converter technology. This project is the first HVDC interconnection in the Mediterranean using voltage source converter (VSC) technology and is recognized as one of the most innovative and challenging subsea HVDC links globally.
Ariadne
EnBW
EnBW
EnBW Energie Baden-Württemberg AG is one of Germany’s largest integrated energy companies, operating as an energy producer and supplier with a focus on electricity, gas, and water services for millions of customers across Germany and Europe. The company is known for its commitment to the energy transition, offering a range of services from power generation—including renewables—to grid infrastructure development and e-mobility initiatives.
In the high-voltage direct current (HVDC) sector, EnBW is involved in the development and operation of advanced grid infrastructure to support the secure transmission of electricity over long distances and enable the integration of renewable energies.
EnBW
Trans Bay Cable
Trans Bay Cable
Trans Bay Cable is a transmission system operator that owns and operates a 53-mile high-voltage direct current (HVDC) submarine cable system running under San Francisco Bay, transferring existing energy from Pittsburg to San Francisco, providing up to 40% of San Francisco's peak power needs.
The Trans Bay Cable project, completed in November 2010, was the first HVDC system to utilize Modular Multi-Level Converter (MMC) technology, with a power rating of 400 MW and operating at a DC voltage of ±200 kV.
Trans Bay Cable
SEAR Group
SEAR Group
SEAR Group is a specialist in complex electrotechnical systems, offering solutions in energy distribution, energy transmission, plant security, automation, and software for both onshore and offshore applications. Operating since 1904 and with approximately 250 employees worldwide, the group provides comprehensive services from consulting and planning to installation, commissioning, and maintenance across sectors such as energy technology, nuclear technology, and industrial automation.
In the field of HVDC (high-voltage direct current), SEAR Group’s expertise includes the delivery and installation of HVDC switchgears as part of their energy transmission solutions, supporting projects that require advanced high-voltage infrastructure.
