4C Offshore Empowering Intelligence
23 Mar 2023: Update 23rd March 2023: The wind farm is producing full power, has undergone necessary tests, and has entered full operations. Update 9th February 2023: The official contractual COD for the full asset (according to the supplier contracts and also relevant for the start of the operational insurance) is expected for Q1 2023. Update November 2022: All turbines have been installed, more then two-thirds are producing energy and will be fully commissioned by the end of the year. Update January 2022: due to delayed foundation installation start, date has been pushed back. End-2022 is now targeted commissioning date. update 03/04/20: Offshore Construction due to start Autumn 2021 with commissioning in Q4 2022. update 23/08/19: Commissioning of the last turbine scheduled for autumn 2022. Following announcement that Kaskasi had successfully won in the 2018 transitional tender, Innogy confirmed that they expect to reach FID in 2020 with project commissioning in 2022.
Fully Commissioned
342 MW
4C Offshore | Location Map: Lat(54.489) Lon(7.695)

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General Information
Other Names
Kaskasi II, (formerly) Hochsee testfeld Helgoland
Development Status
Fully Commissioned
Category or Round
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RWE Renewables

RWE Renewables


RWE Renewables

RWE Renewables


RWE Renewables

RWE Renewables

Owner-Offshore Transmission

Tennet Offshore GmbH

Tennet Offshore GmbH

Offshore Construction Starts
Submitted For Consent
Consent Authorised
Financial Close
First Power
Full Commissioning
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Revenue Mechanism
Revenue Details
EUR 46.6/MWh (EUR 46.6/MWh)

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Power & Turbines
Windfarm Capacity
342 MW
Turbine Model
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Other Turbine(s) Used
Min. Turbine Capacity (MW)
Max. Turbine Capacity (MW)
Min. Number of Turbines
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Max. Number of Turbines
Total Turbine Height
Hub Height
Rotor Diameter
Foundation Type
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Foundations on Wind Farm
Foundation Comments

Location & Environment
Sea Name
North Sea
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Depth Range (Chart Datum)
Depth Range (Stated by Developer)
Distance from Shore (Developer)
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Distance from Shore (Computed)

Installation Base
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Ops and Maintenance
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Number of Offshore Platform(s)
Shared Platform Type
Grid Connection Point
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Cable Landing Point

Export Cables (AC & DC)
Number of Export Cables (AC)
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Average Length per Cable (AC)
Additional Requirements (AC)
Nominal Voltage (AC)
Number of Export Cables (DC)
Average Length per Cable (DC)
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Additional Requirements (DC)
Nominal Voltage (DC)

Nominal Voltage

Onshore Cables
Number of Onshore Cables
Average Length per Cable
Expected Life