Case study: Rampion Offshore Wind Farm


The 400MW 116 turbine project is located 13km off the Sussex coast.  When completed, later in 2018, it will provide enough green electricity to power the equivalent of around 350,000 UK homes. Now into the turbine commissioning and testing phase, the wind farm has started generating power, with electricity first delivered to the grid in November 2017.

The challenge


When the Rampion Offshore Wind Farm (ROWF) approached ForeCoast® Marine early in 2016, they were at the end of the first phase of construction. The initial phase had been significantly impacted by the weather, resulting in greater downtime than expected, and a threat to them achieving the overall project programme. 


Based on this position, ROWF was looking to address a distinct challenge:

To implement a revised construction strategy to get the project back on programme. 

With this challenge in mind, their goals for ForeCoast® Marine were clear, it needed to:

  • Help inform and optimise the revised construction strategy prior to commencing the second phase of construction. 

  • Monitor and re-forecast the construction programme on a weekly basis (once construction was underway) to help anticipate and react to further project delays.

  • Provide a rigorous evidence base to support their strategic and day to day construction strategy decisions, demonstrating best practice to the project backers.

ForeCoast® Marine was instrumental in helping us making informed strategic decisions and demonstrating high levels of due diligence. 

Jonathan Grigg, Offshore Logistics Manager, ROWF

The solution


Strategic decision making: The relative merits of a range of different vessel and construction strategies were evaluated

using ForeCoast® Marine’s Gamer Mode application. The planned construction phase was simulated in a virtual world. Through these simulations, all the operations that were required to complete the installation of foundations and turbines, their interdependencies, and the associated metocean effects were represented. 

Weekly forecasts: The Gamer Mode was also used to forecast and monitor the construction process on a weekly basis when under construction.  Each week the model was run to re-project the installation schedule based on the progress made to date and the work remaining. 

ForeCoast® Marine allowed us to continually monitor construction progress and anticipate slippages for key milestones and critical paths in advance. This provided us the foresight to take action and strategize ahead of these slippages, helping to mitigate impacts on costs and programme. 


Jonathan Grigg, Offshore Logistics Manager, ROWF

The benefits 

In our work with the ROWF we undertook wide ranging simulations considering the impact of different decisions on cost and programme, such as:

  • vessel choice

  • seasonal working strategies

  • distribution of tasks against different vessels

  • the impacts of technical breakdowns, etc. 


The variations in costs across these scenarios was considerable, and of the order of many millions of pounds. The programme for construction was also tight (due to environmental and CFD restraints), and poor decisions would have resulted in a failure to meet this programme. 


ForeCoast® Marine was used to inform decision making from the planning stage through to the installation of the last turbine. And after 18 months of construction, we predicted the installation of the last turbine to within 3 days of reality.

To find out how ForeCoast® Marine can help you, please get in touch