To main content

Cieg GJ1 Cable repair

Channel Islands Electricity Grid, a joint venture between Jersey Electricity and Guernsey Electricity operate several interconnecting power cable systems (power and telecom) between Jersey, Guernsey and France. Both Jersey and Guernsey rely upon the services of these interconnecting power cables and as a consequence there is a demand to reduce the possible effects and impact of failure to these interconnecting power cables. Boskalis were contracted to conduct a preemptive repair replacing a section of cable including the installation two subsea joints on the Guernsey Jersey circuit, close to Havelet bay.

SCOPE OF WORK

  • Mobilisation of cable repair vessel and auxiliary equipment
  • Mobilise cable storage pan and turntable onto transpooling barge
  • Load spare cable from the storage pan onto the Ndurance
  • Determine cable cut position along cable route
  • Cut, test and seal operations
  • Removal of sea end cable till jointing location
  • Cut cable and joint to new cable section
  • Lay down joint No.1 on sea bottom and lay new section of cable
  • Recover shore end and joint both cable ends
  • Lay down joint No.2 and omega on sea bottom
  • Post lay ROV survey

Having signed a Power Cable Maintenance Agreement (PCMA) in the summer of 2012, Boskalis maintains a long standing relationship with Channel Islands Electricity Grid (CIEG). The parties involved in the agreement have worked together to achieve a quick response method for maintaining and where necessary repairing the subsea assets that are so vital for the islands communities.

In November 2014 Boskalis was instructed to mobilise for a preemptive repair after CIEG had detected a potential vulnerability in the subsea cable, which provides a power link to the Island.

Extensive and detailed engineering was carried out over the Christmas and New Year period, owing to the very difficult repair area.

The large tide range and strong, unpredictable currents around the shallow rocky outcrops of Havelet Bay created a number challenges during the engineering phase. Being a winter repair in the English Channel the planning for the project was critical. Mobilisation of the CLV “Ndurance” started on the 12th January with the cable being loaded from the Boskalis storage only 5 days later. The vessel arrived in Havelet bay, Guernsey on the 21st January to start the repair operations after 48 hours of DP familiarisation along the challenging route. The repair operation was broken into sections to ensure that each operation could be complete once it had been committed to. The repair was completed on schedule and to the satisfaction of all parties on the 5th February 2015.

Guernsey Electricity issued a statement which commended the professionalism and efficiency of Boskalis throughout what was a challenging repair in a difficult period.

Project vessels and equipment

Ndurance_CLV.png

Ndurance

Cable-laying/multipurpose vessel

Download sheet

Related projects

Selected filters
_L4F8705_header.jpg

Port development, Pipavav

As a result of the booming container market in recent years, GPPL and APM Terminals introduced a long term investment plan to further develop the port’s facilities. Phase 2 of the expansion program included the reclamation of a new storage (container stacking) area and the extension of the port’s capacity by deepening the approach, channels and berths, allowing larger (container) vessels to enter the port. Zinkcon Marine Singapore, a subsidiary of Boskalis International B.V., won the contract for the dredging and reclamation works for Phase 2. In the beginning of 2009, however, the client re-evaluated the investment against the background of the dramatic effects of the economic crisis, which seriously affected the global container market. GPPL, APMT and ZMS agreed to optimize the project in such a way that all parties would benefit.

Read more
Oman_-_the_Wave_I_header.jpg

Reclamation, dredging and excavation, The Wave

Through Orascom, the Omani government is developing their tourist and real estate sector in order to diversify its economical drivers. The Wave, Muscat is the first freehold tourism and residential development to be launched in the Sultanate of Oman. The USD 805 million project will stretch along 7 kilometers (4.35 miles) of beachfront land overlooking the Gulf of Oman and covers an area of approximately 2.5 million square meters (26.9 million square feet). It is located in Muscat, Oman's capital city, about 5 kilometers (3.1 miles) from Muscat’s Seeb International Airport.

Read more
f__Queen_of_the_Netherlands_def_header.jpg

Land reclamation and revetments works, Salam Yiti

Salam Yiti is located near the south of Muscat, about 40 minutes away from Muscat’s international airport, and minutes from the traditional business and hotel district of Qurum. The Salam Yiti development covers 420 hectares of land and climbs as high as 140 meters above sea level. The project is being developed at a cost of USD 1.7 billion. It was scheduled for completion by 2013. The development plan features luxury hotels, state-of-the-art spas, exclusive villas and apartments, and luxury townhouses set on the beach and in the mountains and select shopping and dining outlets, all surrounded by a championship golf course, marina, a wellness and eco-marine center.

Read more
angola_2_header.jpg

Dredging, reclamation and
shore protection, Soyo LNG

Angola is one of the world’s deep water oil exploration ‘hot spots’. More than 50 significant oil discoveries in Blocks 14, 15, 17 and 18 are believed to contain at least 10 billion barrels of oil. With the increase in oil production comes large quantities of associated gas. Historically, in the absence of a local market, associated gas has been flared or reinjected into the reservoirs. Sonangol, the state oil company, and some of its oil producing partners developed the Angola LNG Project to reduce flaring of gas and curtail gas injection. Angola LNG is a joint venture project involving the major oil producers in the country. Sonangol and Chevron are the co-leaders of the project; the other partners are Total, ENI and BP.

Read more
MBK2-2_header.jpg

Port expansion, Ras Laffan

The Ras Laffan project is one of the largest maritime engineering projects in the world. Its sheer size can best be viewed from space. Over a period of three years, more than 3,000 specialists have been working together to create the largest LNG harbor in the world. The total contract value is approximately USD 2 billion, with the Boskalis share amounting to 50%. Qatar has natural gas reserves of roughly 25 trillion m3, 15% of the world total. The gas is transported from the Offshore North Field (26,000 billion m3), 80 kilometers north of Qatar, into Ras Laffan, where it is liquefied and pumped into latest generation tankers.

Read more
Boskalis_Aerials_by_Lucas_Dawson__15__header.jpg

Channel deepening, Melbourne

To maintain its position as number one container and general cargo port in Australia, the Port of Melbourne Corporation (PoMC) proposed a plan to make the port accessible to 14m draught vessels during all tidal phases. Following the selection of a partner in April 2004 an Alliance Agreement was developed between PoMC and Boskalis Australia Pty Ltd, i.e, a contract where risk sharing was the norm and Boskalis could provide advice during the project development phase using its ‘in house’ expertise and experience.

Read more

Dredging & Inland Infra

Offshore Energy

Salvage

Read more

Read more