–    Indeximate has worked with SSEN to further improve the monitoring of its subsea power cables in Orkney into a sustainable, low-bandwidth solution for one of the UK’s harshest marine environments.

–    Following a successful trial period, Indeximate and SSEN have reached a Master Service Agreement to enable further monitoring of subsea power cable assets across the north of Scotland.

Indeximate, the leading provider of fibre sensing-based subsea power cable health monitoring, today announced it has been supporting Scottish and Southern Electricity Networks (SSEN) Distribution to deliver enhanced subsea power cable monitoring of critical island interconnectors in Orkney. The project is an important part of SSEN’s commitment to ensuring network resilience and access to clean energy for the island communities.

The initial work has focused on two subsea cables which form an essential part of SSEN’s Northern Orkney 33kV ring network serving the Northern Isles and include cables which traverse some of the most energetic tidal channels in Europe. The subsea cables are exposed to some of the most challenging subsea conditions in the UK. Their long-term resilience and continuous operation are a lifeline for island communities and ensures electric power can reliably replace diesel generators.

SSEN had previously received OFGEM SIF funding to develop Distributed Acoustic Sensing (DAS) to provide real-time insight into cable movement and environmental loading to support asset integrity. While trials showed potential, the volume of raw data (terabytes per day) made it technically and economically unfeasible.

Recognising the challenge and turning to Indeximate, SSEN engaged the business in 2024, appreciating that the patented data compression engine, Indeximation®, could make continuous cable monitoring viable in practice. Installed on Westray in October 2024 and using only a 1 Mbps 4G connection to continuously transfer compressed DAS data to the cloud for automated analysis, Indeximate’s services have removed a long-standing barrier to using fibre-sensing as a low-cost security solution for vital subsea power cable connections to SSEN customers in Orkney.

Indeximate’s cloud-based analytics platform, Scattersphere® combines with the Indeximation technology to process terabytes of DAS data into clear, map-based assessments of cable condition and long-term behaviour. Instead of raw data visualisations, SSEN has access to a practical and continuous picture of cable health over time, identifying exposure risk, movement, cable fatigue, and behavioural trends that can directly inform preventative maintenance decisions. Quarterly health reports allow SSEN to allocate resource efficiently and prioritise interventions in the areas that matter most.

Following the success of the first reporting cycle, SSEN has extended the monitoring agreement through to 2028 and established a Master Services Agreement with Indeximate. This will help support the rapid deployment of the approach on other critical subsea cables which SSEN have identified. The further rollout of this agreement will support and enhance SSEN’s investment approach on these assets as it develops its ED3 business plan for the regulated period between 2028 and 2033.

Chris Minto, Director at Indeximate, said: “Subsea cables in Orkney operate in some of the most challenging tidal conditions anywhere in the UK. Monitoring these cables to prevent failure can, realistically, only be done using fibre sensing. Indeximate’s technology has allowed SSEN to extract actionable insight from massive volumes of data generated by DAS fibre-sensing to support planning and asset management. We are delighted that SSEN has recognised the value of our technology for ensuring the health of their subsea power cable assets.”

David Taylor, Senior Investment Planning Manager – Submarine Cables at SSEN Distribution, said: “The subsea cables connecting the northern Orkney Islands are critical to ensuring a safe and reliable electricity supply for these communities, and maintaining their resilience is a key priority for SSEN. With the support of Indeximate’s innovative technologies, fibre sensing has given us a clear understanding of how these assets respond to the extreme tidal forces in this area. This has allowed us to gather additional asset data, which will support our future investment strategies and cable maintenance planning. We’re pleased to be able to strengthen our relationship with Indeximate and further support the long-term reliability of our subsea network for the communities we serve.”