Completed Clean Energy Materials & Manufacturing

Pivoting Deck Vessel prototype construction

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AI plain-English summary

Engineers are building a prototype vessel with a pivoting deck that can safely transfer crew and cargo to offshore wind turbines in rougher seas than current ships allow. Today, when waves rise above a certain height, standard vessels cannot dock safely at turbines. Turbines must then be switched off during maintenance windows, or repairs are delayed entirely. This downtime cuts electricity generation and raises costs, which utilities and consumers ultimately pay for through higher bills. The pivoting deck design, developed by North Sea Logistics, keeps the platform level relative to the turbine as the hull moves with the waves, extending the range of sea conditions in which access is possible. If the prototype succeeds in trials, offshore wind farms could operate more consistently, reducing the amount of fossil-fuel generation needed to fill gaps in supply. That would lower carbon emissions, improve energy security, and reduce the cost of offshore wind electricity for UK consumers. The project builds on a design that was a finalist in the Carbon Trust’s Offshore Wind Accelerator Access competition in 2011, and now aims to produce a vessel ready for commercial testing by utilities.

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The project aim is to build a prototype Pivoting Deck Vessel (PDV) ready for trial by utilities, in which the PDV will demonstrate that it increases offshore wind electricity generating revenues by reducing turbine downtime, thereby decreasing the cost of offshore wind electricity and lowering UK consumer electricity bills. By increasing renewable electricity generation, the amount of fossil fuel generation required reduces, thus also lowering carbon emissions and increasing security of supply. Utilities require vessels to transfer crew and cargo to offshore wind turbines for maintenance, as well as for wind farm construction. The problem is that current vessel designs do not allow for safe and cost-effective access to turbines in rougher seas and so when seas are high, turbine downtime increases, electricity generating revenues are lost and the costs of offshore wind generation rise. The innovative pivoting deck design of North Sea Logistics’ PDV addresses this problem, allowing safe access to turbines in higher seas for crew and cargo. The PDV was a 2011 finalist in the Carbon Trust’s Offshore Wind Accelerator Access competition.

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