Offshore cable support, designed to go the distance

Subsea cable routing and protection, optimised for the longevity and cost-effective development of your project.

Cables allow your revenue to flow

For all of the engineering awe that offshore structures invoke, it’s the subsea cables connecting your assets to the grid that allow revenue to flow. Cables are the unseen heroes of offshore wind and wave energy. It’s crucial to make sure they are positioned efficiently, protected from risks and ready to go the distance.

It can cost millions of pounds to repair damage to offshore energy cables. Such repairs account for more than half of offshore wind insurance claims. The best time for preventative action is at the outset – mitigating the risk of damage to prevent downtime, inflated insurance premiums and capital expenditure further down the line.

Utilise our in-house geotechnical and geophysical expertise to evaluate cable burial risk. We can identify the dangers posed from anthropogenic activity (such as fishing trawlers) as well as geophysical and geotechnical risks, accurately gauging the optimal routes and protection required for your cables. All in a way that’s optimised for the longevity and cost-effective development of your project.

Of course, there is such a thing as too much cable protection. Protective measures should always be balanced with your economic realities. We help to judge the burial depths and armouring necessary to keep your cables safe, long into the future – retaining sensitivity to your development costs and advocating additional protection only when strictly necessary.

Our service includes:

Cable route engineering and optimisation

Burial assessment study (BAS)

Cable protection assessment (CPA)

Cable burial risk assessment (CBRA) – pre-construction and as-laid

Depth of lowering (DoL) specification

Route position lists and route alignment charts

Our service lifecycle

01.

Demystify your site and make sure it’s fit for development with services including survey design, ground modelling and data interpretation.

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02.

Plan for development with meticulous design and engineering services including foundation design and cable burial risk assessment.

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04.

Find out precisely where you stand with expert due diligence, contract advice and dispute resolution services.

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03.

Keep your project on spec and on budget by letting us oversee outsourced site surveys and construction activities.

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01.

Demystify your site and make sure it’s fit for development with services including survey design, ground modelling and data interpretation.

Find out more

02.

Plan for development with meticulous design and engineering services including foundation design and cable burial risk assessment.

Find out more

03.

Keep your project on spec and on budget by letting us oversee outsourced site surveys and construction activities.

Find out more

04.

Find out precisely where you stand with expert due diligence, contract advice and dispute resolution services.

Find out more

Client feedback

What do our clients think?

“Throughout the project Ternan has been easy to work with, responsive and helpful, and were a key deliver partner for the project. We will certainly be approaching Ternan again for future projects.”

Neil Crawford, Subsea Cables Package Manager, Ocean Winds

“Kent have worked with Ternan Energy on several projects now, where Ewan Fielding was the Geotechnical project engineer focal point. Ewan has consistently shown his ability to manage the project scope of work Ternan were required to deliver, including great responsiveness every time it was required and providing a clear and proactive communication to manage expectations and deliveries.”

Kent Group PLC

“…all four of the client representatives were excellent and I wouldn’t hesitate to recommend any of them to other projects or work with them again. All four were on board through some quite difficult situations for various different reasons during this campaign and all were handled very professionally with excellent communication onshore.”

Amelia Chilcott
Site Investigation Package Manager 
RWE Renewables UK

“Jess has and is doing an excellent job on the project in what has been a challenging situation. Jess is positive and pleasant to work with and builds rapport well. She clearly has excellent offshore geophysical experience.”

Lee Goulding, Director of Engineering, Thistle Wind Partners

We make a measurable difference for our clients. Here’s an example.

Take a deep dive into how our geophysical, geotechnical and ocean engineering expertise brings tangible benefits to a project.

FAQs

Does Ternan Energy have the right expertise?

We have an extensive track record that includes the design and management of cable surveys for interconnector projects, design and engineering of cable landfall projects, post-burial assessments and technical reviews for trenching projects. In short: we’ve earned our stripes. And we can provide support on cable routing and protection in even the most challenging conditions.

What can you expect from Ternan Energy’s approach?

Our approach is collaborative: helping clients understand the risks, the probability of cable damage and the cost of mitigation. It’s about providing the clear information you need to make confident commercial decisions.

What is live trenching support?

One highly specialist service we offer is live trenching support – delivering a live assessment of the risk to the cable as first-pass trenching is undertaken. Let’s say it was agreed that a cable should be buried at a depth of one metre. But during trenching, the cable laying vessel is only achieving a burial depth of 0.8m. We can calculate the new cable risk – and help you ascertain whether adding 0.2m of cable depth is worth retracing the cable laying route. When you consider that it costs upwards of £100,000 per day to commission a cable laying vessel, it’s easy to see how this can provide crucial insight to cost management.

Any questions?
Just ask.

If you have any questions or would like to discuss a project, it’s easy to get in touch.

Adam Caton

Senior Geotechnical Engineer

Email: Send email