GJ1
OperationalIsland Link
JEGG
60 MW90 kV37.4 km2019Basic information
8 fieldsAlso Known As
GJ1 · GJ-1 · Greve de Lecq–Havelet cable · Greve de Lecq to Havelet · Jersey–Guernsey (GJ1)
Status
operational
Capacity
60 MW
Project Company
Type
island link
Expected Life
25 years
Website
Supply Chain (3)
Project Timeline (5)
Q4 2019Commercial Operations Full Power
Guernsey Electricity completed the GJ1 replacement subsea cable between Jersey and Guernsey and had it installed and in operation by autumn 2019, restoring reliable interconnection to the European grid in time to support electricity supply over the 2019–2020 winter period. The project, delivered with main subcontractors and cable manufacturer NKT despite challenging weather and tidal conditions, allowed Guernsey to resume importing more than 90% of its electricity from sustainable sources and return the on-island power station to a back‑up role.
3 Oct 2019Replacement Cable Installation StartStale
For the emergency replacement of the GJ1 interconnector, the vessel carrying the new cable departed Scandinavia and was scheduled to arrive at Greve de Lecq in Jersey on 3 October 2019 and Havelet Bay in Guernsey on 6 October 2019, ready for installation, with energisation and completion of burial works planned for early November 2019 to restore low-carbon electricity imports to the islands.
17 Jun 2019Planning Consent Awarded
Licence: Planning permission to start civil works under part of the promenade at Gréve de Lecq for installation of the new GJ1 cable
Guernsey Electricity (GEL) was granted planning permission to undertake civil works under part of the promenade at Gréve de Lecq, Jersey, in preparation for installing a new GJ1 power cable link between Jersey and Guernsey later in 2019.
27 Mar 2019Replacement Cable Supplier Selected
Guernsey Electricity (GEL) signed a contract with Danish cable manufacturer NKT for the purchase and installation of a new 90 kV high-voltage submarine cable system to replace the existing GJ1 transmission link between Guernsey and Jersey in the English Channel. The contract, announced to the States of Guernsey on 27 March, forms the core of a £30 million project (plus £5 million for additional survey and land-based works) intended to address reliability and design issues with the old GJ1 cable and to restore resilient low‑carbon electricity imports, with the new link expected to enter service in 2019.
2000Cable Installation Complete
In 2000, Guernsey Electricity completed installation of the original GJ1 subsea cable between Jersey and Guernsey, enabling up to 60 MW of the island’s 89 MW maximum demand to be imported from the European grid and significantly reducing reliance on on-island fossil-fuel generation.