Geotechnical surveys to optimize North Sea power cable route

Offshore staff

STAVANGER, Norway -- Statoil is compiling the final data for a power supply concept for the Utsira High region fields in the central Norwegian North Sea.

This involves a joint solution for supplying electricity from shore to the Edvard Grieg, Ivar Aasen, Johan Sverdrup, and Gina Krog fields, all due onstream between 2015 and 2018.

The current focus is on final details on the cable route from Kårstø to the Utsira High – the route has been examined twice before, but a comprehensive geotechnical survey of the seabed needs to be performed, including sampling along the entire route.

The Canyon-operated Deep Cygnus vessel is preparing to start the final seabed surveys. Statoil’s geotechnical engineers have identified 100 points along the route where seabed samples are to be gathered. These samples will ensure proper quality of the analyses and interpretations made on the basis of former geophysical surveys.

Plans are for two parallel DC cables to transmit electricity from Kårstø on the western Norwegian coast roughly 200 km (124 mi) to the Utsira High, where a separate converter and distribution platform will supply the various fields.

“In order to ensure an optimal solution, it is necessary to develop a better basis for the design and defined power need from Johan Sverdrup, which is the largest of the four developments and the driver of the whole power solution,” said Hans Jørgen Samuelsen, Statoil’s venture manager for the Utsira High land-generated power supply” project.

“A concept involving installation of a distribution platform in 2017 and start-up of power supplies in 2018 is therefore being studied.”

No final decision will be taken on a final power solution concept before end-2013, and any final investment decision will not be made before 2014.


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