Vattenfall have contracted Deme Offshore NL BV to provide rock installation works, utilizing their fleet of inclined fall pipe vessels. Works shall take place between Q4 2023 and Q1 2025. Sam Gardner, Project Manager, says: “Based on lessons learned in the offshore wind industry, Vattenfall are taking proactive measures to reduce risk and increase the lifetime integrity by stabilizing the Inter Array Cables (IAC) at HKZ 1-4 with rock berms.”
Prior to rock berm installation works commencing, Vattenfall contracted Fugro to carry out IAC inspections and scour pad surveys. This was executed using one of Fugro’s Blue Essence® uncrewed surface vessels (USVs) with Blue Volta®, an electric remotely operated vehicle (eROV). Controlled from Fugro’s remote operations centre based in Aberdeen, this technology reduces fuel consumption by up to 95% compared with conventional support vessels and eliminates the need for personnel to work in high-risk offshore environments. This approach supports Vattenfall’s goals and objectives by offering improved safety and sustainability. The IAC and scour pad survey works are ongoing, and completion is expected in October 2023.