Offshore HVDC converter stations turn the generated wind power from alternating current (AC) to direct current (DC) and transmit the electricity to shore, where a second converter station will turn the power back to AC and integrate it into the AC grid. At such distances underwater, HVDC is the most feasible way to transmit electricity, and losses are minimized, meaning more power reaches the end consumer. By using HVDC, the reliability also increases in the AC grid due to the system’s uniquely flexible and controllable features.

The latest HVDC Light® system used for these connections provides the most compact design and the lowest energy losses in the power industry. According to an independent life cycle assessment, implementing this pioneering technology will reduce the lifetime CO₂ impact by almost two-thirds, compared to previously commissioned installations, supporting the clean energy transition and the strong global focus on carbon-neutral energy systems.

Hitachi Energy’s total scope of supply includes the design, engineering, procurement, construction and installation of six converter stations, three onshore and three offshore. Aibel AS, with whom Hitachi Energy has a strategic partnership on offshore wind connections, will provide the three offshore platforms which will house the HVDC equipment. The Dogger Bank HVDC project is an early example of a new business model in the HVDC industry, where orders are placed for multiple, similar HVDC systems. This new approach allows Hitachi Energy to plan in advance to increase manufacturing capacity, expand and train the workforce, and maximize standardization to increase synergies between successive projects.

Note to editors:

Hitachi Energy’s HVDC solution combines world-leading expertise in HVDC converter valves; the MACH™ digital control platform², converter power transformers and high-voltage switchgear; as well as system studies, design and engineering, supply, installation supervision and commissioning.

HVDC Light® is a voltage source converter technology developed by Hitachi Energy, which was launched over 25 years ago. It is the preferred technology for many grid applications, including interconnecting countries, integrating renewables and “power-from-shore” connections to offshore production facilities. HVDC Light’s defining features include uniquely compact converter stations and exceptionally low electrical losses.

Hitachi Energy pioneered commercial HVDC technology almost 70 years ago and has delivered more than half of the world’s HVDC projects.

The Dogger Bank Wind Farm project is being developed and built by the UK’s SSE Renewables in a joint venture with Norway’s Equinor and Vårgrønn (a joint venture of Eni Plenitude and HitecVision). SSE Renewables is lead operator for the development and construction of Dogger Bank Wind Farm. Equinor will be lead operator of the wind farm on completion for its expected operational life of around 35 years. Vårgrønn brings specialist offshore wind expertise to the project.