Ocean Services Integration for US Offshore Wind Cable Trenching

DeepOcean, a subsea services specialist, executed inter-array cable trenching and survey work for a U.S. offshore wind project under contract with a global engineering, procurement, construction and installation (EPCI) provider, employing specialized marine assets to enhance subsea cable protection and integration.

Context of the Cooperation
DeepOcean, an ocean services provider with expertise in subsea construction, inspection, maintenance and trenching, was engaged by a global EPCI contractor to perform critical subsea cable works on an offshore wind farm in the United States. The project addresses the technical challenge of ensuring reliable electrical connectivity between offshore wind turbines and their associated substations. Inter-array cable systems require precise burial and geotechnical validation to meet engineering design parameters and to mitigate long-term exposure to environmental loads and fishing or anchoring activities.

Technical Solution and Responsibilities
The cooperation focused on delivering subsea trenching and hydrographic survey services for the inter-array cables — the medium-voltage subsea electrical lines linking individual wind turbine generators to offshore substations. DeepOcean was responsible for executing these operations using a trenching support vessel (TSV) and deploying the UT-1, a high-capacity free-flying jet trenching tool. The UT-1 system uses high-pressure water jets to fluidize seabed sediments, creating a trench conforming to specified depth and cover requirements to achieve cable burial in line with industry engineering standards and risk criteria.

The EPCI contractor coordinated overall project engineering and integration with the wind farm’s construction schedule, including export system interfaces and offshore balance-of-plant works. DeepOcean’s role was operational execution within the allocated marine works scope, ensuring alignment with the broader installation sequence and safety protocols common in offshore renewables projects.

Deployment and Implementation
The trenching and survey operations were carried out offshore in U.S. waters. The TSV provided dynamic positioning and platform support for subsea interventions, while the UT-1 jet trencher delivered controlled trench profiles. These operations were integrated with existing site survey data and cable corridor design parameters, enabling precise burial depths and minimizing exposure of the cable system to external hazards. The survey component verified seabed conditions and updated bathymetric data to refine trenching execution plans in a feedback loop with project engineers.

Applications and Use Cases
This cooperation is pertinent to offshore wind developers and contractors involved in subsea infrastructure deployment. Technical use cases include inter-array cable protection for fixed-bottom wind farms, where adherence to electrical performance criteria and cable integrity standards (e.g., burial depth specifications, soil resistivity considerations) is critical. The work supports grid reliability and operational maintainability of offshore wind assets.

Results and Expected Impact
Completion of trenching and survey work contributes to the long-term stability and integrity of the cable infrastructure by achieving engineered burial depths and updated seabed condition datasets. Such outcomes reduce potential failure modes (e.g., cable exposure or mechanical damage) and support lifecycle management plans for offshore energy assets. The use of purpose-built subsea tools like UT-1 enhances engineering precision and operational efficiency, aligning with industry objectives for cost-effective installation and risk mitigation.

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