DolWin3

Offshore GridOperationalDE900 MW320 kV206.4 km

Basic Information

Also known as:HVDC DolWin3, DolWin 3, DolWin3 grid connection, TenneT DolWin3, DolWin3 (DOL3), DOL3

Status:Operational

Capacity:900 MW

Transmission Model:TSO Build & Own

Owners:

TenneT (TenneT Offshore)

Copenhagen Infrastructure Partners (CIP)

Project Company:

TenneT Offshore DolWin3 GmbH & Co. KG

Type:offshore grid

Expected Life:40 years

Website:www.tennet-offshore-3.eu

Description:

DolWin3 is a TenneT‑owned HVDC offshore grid connection that transmits up to 900 MW of electricity from North Sea offshore wind farms to the German mainland. The system uses VSC (voltage source converter) HVDC technology rated at ±320 kV and links the DolWin gamma offshore converter platform to the onshore...

Supply Chain (0)

Project Timeline (0)

No lifecycle events recorded yet.

	German North Sea	Lower Saxony
Landfall	N/A	Hamswehrum, Lower Saxony, Germany
Grid Connection	—	Dörpen/West substation

Financial

€1,900M€2,293.5M adj.€12.35k/MW-km

www.fihpartners.com (Feb 2014)

CAPEX:€1,900M

Adjusted to 2025¹:€2,293.5M

Cost Intensity¹:€12.35k per MW-km

Estimate Date:Feb 2014

Source:www.fihpartners.com

Notes:

TenneT expected total construction costs of ~€1.9 billion for DolWin3 (i.e., €1,900 million). Note: CIP invested €384m (minority investor); other reported contract values include Alstom turnkey >€1bn and Prysmian cable...

¹ Cost inflated in local currency then converted to euros (where applicable).

Cable Specifications

DolWin3 HVDC export (DolWin gamma – Dörpen/West)

Hamswehrum, Lower Saxony, Germany

2 × 320 kV HVDC · bipole · XLPE (Cross-linked Polyethylene) · 900 MVA · 161 km

System:2 × 320 kV HVDC · bipole

Insulation:XLPE (Cross-linked Polyethylene)

Power rating:900 MVA

Route length:161 km(83 subsea · 78 land)

Burial depth:

Offshore subsea sections of the DolWin3 export cables were installed with targeted burial to protect against anchors, fishing gear and seabed abrasion; published project summaries state offshore burial depths of...

Fibre optic:

The DolWin3 cable system was delivered with an associated fibre‑optic cable system integrated into the HVDC cable supply. Prysmian’s contract and subsequent commissioning statements explicitly mention an "associated fibre optic...

Borkum Riffgrund 2 – DolWin gamma AC interlink (three 155 kV submarine cables)

Hamswehrum, Lower Saxony, Germany

155 kV MVAC · 22.7 km

System:155 kV MVAC

Route length:22.7 km(22.7 subsea)

Burial depth:

Project documentation and supplier releases for DolWin3 state that offshore HVDC cable sections were engineered to be buried to protect against anchor damage and seabed abrasion, with nominal offshore burial...

Fibre optic:

Prysmian’s scope for DolWin3 included an associated fibre‑optic cable system integrated with the power cables. Project and supplier material describe integrated fibre optics used for real‑time monitoring, protection and communications...

Merkur Offshore – DolWin gamma AC interlink (two 150 kV submarine cables)

East Frisian coast, Lower Saxony, Germany

3 × 155 kV MVAC · 22.7 km

System:3 × 155 kV MVAC

Route length:22.7 km(22.7 subsea)

Burial depth:

Project documentation for the DolWin3 cable system states that offshore subsea sections are typically buried to protect against anchors and abrasion; nominal target burial for the offshore sections is about...

Fibre optic:

Prysmian and project press materials confirm the DolWin3 cable systems include integrated fibre‑optic(s) as part of the cable supply (an associated fibre‑optic cable system supplied and commissioned alongside the power...