Expertise
As the world accelerates towards net zero, subsea power cables are becoming vital links that connect offshore renewable energy to mainland grids across borders. These underwater cables have to overcome geographic and regulatory challenges to enable seamless, cross-border energy flow.
Effective planning of subsea cable routes involves a multi-faceted approach, beginning with a comprehensive desktop study. This initial phase, often guided by the International Cable Protection Committee (ICPC) Recommendation No. 9, focuses on identifying potential hazards and mitigating risks. A thorough route selection process is essential to avoid obstacles such as boulders, shipwrecks, existing infrastructure (e.g. pipelines, cables), environmentally sensitive areas, and critical zones like anchorages. Navigating busy shipping lanes and adhering to stringent environmental regulations are paramount.
Tanjung Pinggir (Batam) – Jurong Island (Singapore) theoretical subsea power cable study, part of the ongoing efforts to facilitate green energy power imports. Route shown is Illustration only.
Stakeholder engagement and regulatory compliance are integral to ensuring smooth project progression. Consulting with maritime authorities, environmental agencies, and other key stakeholders early on helps address potential concerns and streamlines the permitting process. Various national and international authorities play vital roles in regulating subsea cable installations.
Following the desktop study, marine surveys are conducted to gather detailed site-specific data. Geophysical surveys employ technologies like multibeam echo sounders and side-scan sonars to map seabed topography and identify underwater hazards. Geotechnical surveys, involving penetration tests and soil sampling, assess seabed sediment properties to determine cable burial feasibility.
Data from these surveys informs cable route optimisation, ensuring minimal environmental disruption and reducing the likelihood of construction delays. To explore in more detail a recent Marine Survey undertaken by the team from Surbana Jurong, click here.
The final Route Position List (RPL), generated from the marine survey data, provides precise geographic coordinates for the subsea cable route, ensuring accurate alignment and long-term viability. To learn more about what goes into the development of the RPL, read our technical paper here.
The strategic deployment of subsea cables, supported by detailed planning and comprehensive surveys, is vital for unlocking renewable energy potential and achieving a sustainable energy future. To find out more, download our thought leadership below or contact us for an introductory discussion.
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