alpha ventus

Offshore GridOperationalDE62 MW110 kV66 km

Basic Information

Also known as:NOR-2-1

Status:Operational

Capacity:62 MW

Transmission Model:TSO Build & Own

Owners:

TenneT TSO GmbH(100%)

Project Company:

TenneT TSO GmbH

Type:offshore grid

Website:www.tennet.eu

Description:

The Alpha Ventus grid connection (NOR-2-1) is a TSO-owned HVAC export link built to transmit electricity from the Alpha Ventus offshore test field to the German onshore transmission network. The system collects power at the wind farm’s offshore transformer platform and conveys it to shore via a single alternating-current submarine...

Supply Chain (0)

Project Timeline (0)

No lifecycle events recorded yet.

Route

	German Bight (North Sea)	Lower Saxony
Landfall	N/A	Hilgenriedersiel, Lower Saxony, Germany
Grid Connection	—	Hagermarsch substation

German Bight (North Sea)

Landfall:N/A

Grid:—

Lower Saxony

Landfall:Hilgenriedersiel, Lower Saxony, Germany

Grid:Hagermarsch substation

Financial

€74M€97.6M adj.€23.85k/MW-km

www.mresearch.com (Jan 2008)

CAPEX:€74M

Adjusted to 2025¹:€97.6M

Cost Intensity¹:€23.85k per MW-km

Estimate Date:Jan 2008

Source:www.mresearch.com

Notes:

Reported estimated cost for the offshore grid extension / export cable connecting Alpha Ventus to the onshore 110 kV network (expected commissioning ~2008).

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

Cable Specifications

Alpha Ventus export cable (offshore transformer station to Hagermarsch)

Hilgenriedersiel, Lower Saxony, Germany

1 × 110 kV HVAC · 180 mm dia. · XLPE (Cross-linked Polyethylene) · 62 MVA · 66 km

System:1 × 110 kV HVAC

Construction:180 mm dia.

Insulation:XLPE (Cross-linked Polyethylene)

Power rating:62 MVA

Route length:66 km(59.1 subsea · 6 land)

Burial depth:

Within the wind farm the inter-array 33 kV cables were buried to a nominal target depth of about 0.6 m (60 cm) — roughly 16 km of cable were buried...

Fibre optic:

The subsea export cable includes integrated fibre‑optic data lines used for turbine/substation communications, control and monitoring (SCADA) and research/telemetry links (supporting the RAVE research programme and connection to nearby metocean...

Collector Stations

Offshore transformer station (alpha ventus)

Alpha Ventus offshore transformer station, Germany

62 MW 110 kV · offshore

Rating:62 MW · 110 kV

Location:offshore

Hagermarsch substation

Hagermarsch (Umspannwerk Hagermarsch), Germany, Germany

62 MW 110 kV · onshore

Rating:62 MW · 110 kV

Location:onshore