This JIP is investigating the use of floating modules in combination with reclaimed land to make islands more adaptive in every stage of their life time.


To support cost-effective renewable energy production far out at sea there is a need for O&M support, efficient and safe energy conversion, transport and storage of renewable energy. The Joint Industry Project HybridEnerSeaHub aims to fulfil those needs with a comprehensive design of a partially floating energy hub in the North Sea.

The possibility of using floating modules will be investigated to support the functionality of the energy island in every stage of its life cycle. This modular approach could make the island more adaptive to the needs of future activities such as floating workshops, and storage facilities can easily be attached and relocated in the different stages of the offshore developments. This is an advantage since investments only need to be made when needed and the floating facilities can be re-deployed elsewhere once it has served the project’s needs. Furthermore, a partially floating island may have a smaller impact on the sea life and surroundings than a large permanent reclaimed island. On the other hand motion requirements and mooring loads will possibly set a practical limitation for a floating island on the North Sea. Therefore a combination of floating modules connected to a reclaimed island will be investigated.


Contact person photo

ErikJan de Ridder

Senior Project Manager/Teamleider


The proposed scope of work is presented in a project plan consisting of six work packages.

WP1: Design Basis
1.1 Investigate possible future functionalities of the island
1.2 Motion criteria related to various activities
1.3 Initial metocean dataset
1.4 Initial risk study

WP2: Fixed/Floating Hybrid Design Concept
2.1 Conceptual design floating island & mooring
2.2 Coastal study for the reclaimed island
2.3 Motion analysis of the floating modules

WP3: Environmental impact evaluation
3.1 Inventory of potential ecological functions of a hybrid island
3.2 Ecological risk assessment for sea life
3.3 Advice on design from an ecological perspective

WP4: Performance evaluation of the Hybrid Design Concept
4.1 Apply bathymetry/coastal study
4.2 Calculate hydrodynamics
4.3 Structural & fatigue analysis (hull, mooring & couplings)
4.4 Model test hybrid island for validation of the numerical models
4.5 Harbour safety study (optional)
4.6 Model test floating island with (underwater) breakwater (optional)

WP5: Business case evaluation
5.1 Life cycle assessment of functionality
5.2 Cost estimates for the islands

WP6: Project coordination


The deliverables of this JIP can be used to take the next step in the design of a hybrid island to support cost-effective renewable energy production far out at sea. The JIP results can also be used for other island locations and applications. The most important deliverables of this project will be:

  • Island design criteria for critical equipment (e.g. power transformation systems)
  • Preliminary island and mooring design
  • Design optimization for motions
  • Environmental impact study
  • Improved and validated numerical design tools
  • Cost estimate for multiple island building methods
  • Preliminary risk study

organisation & schedule

The HybridEnerSeaHub JIP will be conducted as a 2½ year Joint Industry Project in close co-operation with energy companies, operators, yards, engineering companies and marine system suppliers. MARIN will act as JIP manager and sign participation agreements with all members. All participating companies will be represented in the JIP Steering Group with meetings during the BlueWeek. Presentations, reports and other relevant information will be posted on the confidential project website. The total project budget is 1 million Euro and the project will start October 1, 2019.
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