4C Offshore Empowering Intelligence

Pentland Floating Offshore Wind Demonstrator

07 Mar 2022: The project will be awarded the consent variation and has been advised that an EIA is not required. The Proposed Works involve decreasing the number of WTGs for construction from two to one and the removal of the individual capacity limit of 6 megawatts (“MW”) and total generating capacity limit of 12MW from the Section 36 Consent. This will entail dimensional changes in WTG design, increasing the tip height from 201 metres (“m”) to 208m, rotor diameter from 154m to 179m and the height of the floating platform above water from 15m to 30m. Additionally, the proposed works involve an increase in the distance of the WTG from shore to approximately 8.28km, and this should be applied for as part of the variation to the section 36 consent. The Proposed Works further involve the separation of the single clump weight suspended in the water beneath the floating platform into multiple separate weights and the inclusion of suction bucket and drilled and grouted anchoring solutions, in addition to the previously licensed drag embedment anchors. This will also involve the inclusion of a taut mooring system option and the inclusion of a synthetic lines option, as well as the currently licensed chain and/or steel lines. The export cable voltage will also be increased from 33kV to 66kV. The conclusion of the assessment on environmental receptors undertaken by Highland Wind Limited, including updated ornithological collision risk modelling, contends that the Proposed Works would not lead to a greater significance of environmental impacts on receptors than already authorised by the Section 36 Consent and Marine Licences. It is contended that the effects on marine ornithology and seascape, landscape and visual amenity will reduce as a result of the reduction from two WTGs to one. It is also contended that the taut mooring system will reduce the environmental effects of fish ecology and marine mammals.
United Kingdom
Consent Authorised
15 MW
4C Offshore | Location Map: Lat(58.652) Lon(-3.850)

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General Information
Pentland Floating Offshore Wind Demonstrator
Other Names
Dounreay Trí
United Kingdom
Development Status
Consent Authorised
Category or Round
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Highland Floating Winds Ltd

Highland Floating Winds Ltd


Copenhagen Infrastructure Partners

Copenhagen Infrastructure Partners


Hexicon AB

Hexicon AB

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

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Power & Turbines
Windfarm Capacity
15 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
Scottish Continental Shelf (Fair Isle)
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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