HelWin1 is a TenneT-owned High-Voltage Direct Current (HVDC) offshore grid connection that evacuates power from the Nordsee Ost and Meerwind Süd/Ost offshore wind farms to the German mainland. The link uses voltage-source converter (VSC) HVDC technology (Siemens HVDC Plus) at an offshore converter platform (HelWin alpha) and an onshore converter...
Approximate contract award value (~€500M) for the Siemens–Prysmian consortium to deliver the HelWin1 turnkey grid connection; Prysmian's portion of the contract was reported as >€150M. This is the contract award...
1 Cost inflated in local currency then converted to euros (where applicable).
Project sources report that the HelWin1 export cable was post‑laid and subsequently buried where feasible, with routine target burial depths in the order of ~1–2 metres. Offshore segments were embedded...
Fibre optic:
Sources indicate the HelWin1 link uses fiber‑optic provisions for system control, protection and monitoring: fiber‑optic communications are used for real‑time synchronization and remote control of the offshore and onshore VSC...
HelWin alpha – Nordsee Ost HVAC submarine cables
155 kV HVAC
System:155 kV HVAC
Route length:0 km land
Burial depth:
Sources describing the HelWin1 project state that subsea cables were post-laid and then buried using seabed ploughing to provide protection against external damage. Published accounts indicate a typical target/nominal burial...
Fibre optic:
Project and contractor documentation and technical summaries indicate fibre‑optic capability is integrated into the HelWin/associated cable systems for control, protection, telemetry and operational communications between the offshore platform(s) and onshore...
For the HelWin1 subsea cable system Prysmian/Prysmian‑Siemens works reported post‑lay burial using seabed ploughing to embed the submarine cables to a nominal depth of roughly 1–2 m below seabed. Sources...
Fibre optic:
Project documentation and technical summaries indicate fibre‑optic elements are integrated into the HelWin cable systems and associated cable bundles for control, protection and monitoring purposes. Public sources describe fibre‑optic controls...
Converter Stations
HelWin alpha
HelWin Alpha (offshore converter platform, northwest of Helgoland), Germany