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Transmission & distribution |


UK’s Eastern Green Links 1 and 2: preferred suppliers named


Transmission system upgrade, with the aim of getting clean power from where it’s generated to where it’s needed, is a sine qua non of the energy transition, not least in the UK, where preferred converter and cable suppliers have recently been named for the proposed Eastern Green Link 1 (EGL1) and Eastern Green Link 2 (EGL2) HVDC connections.


The EGL1 project will see the construction of a 190 km 525 kV, 2 GW HVDC subsea link between Torness in East Lothian, Scotland, and Hawthorn Pit in County Durham, England, while the EGL2 plan consists of a 436 km 525 kV, 2 GW subsea HVDC transmission system linking Peterhead in Scotland to Drax in England. The latter would be the longest HVDC link in the UK and has been described as the UK’s “single largest electricity transmission project ever.”


For EGL1, SP Transmission (SPT) and National Grid Electricity Transmission (NGET) have selected GE Vernova’s Grid Solutions business


Peterhead North Sea Eastern Green Link 1 Eastern Green Link 2


Hawthorn Pit Torness


Drax Ireland


United Kingdom


Netherlands


and MYTILINEOS as preferred suppliers for the two converter stations, and Prysmian Group has been selected as the exclusive preferred bidder for the HVDC cabling contract. Following “final approval of regulatory allowances” from Ofgem, full contracts for EGL1 are expected to be complete later this year with construction work due to begin in 2024. The target operational date is 2029. For the EGL2 converter stations, SSEN Transmission and NGET have selected Hitachi Energy in partnership with BAM as preferred suppliers.


Prysmian Group has been selected as preferred bidder for the EGL2 cable and the proposed project schedule is similar to that for EGL1, with work expected to start in 2024, following final approval from Ofgem, and a targetted operational date of 2029. National Grid has recently launched what it calls “The Great Grid Upgrade”, the “largest overhaul of the grid in generations” and a multibillion investment in new electricity transmission projects across England and Wales. The Upgrade includes further subsea links between Scotland and England, and proposals for the Humber and East Anglia regions (including a further subsea link between Suffolk and Kent). In Scotland, SSEN Transmission plans to invest over £10 billion to upgrade the network around key areas, connecting new onshore and offshore renewables generation in the north of Scotland, as part of its ‘Pathway to 2030’ programme,


supporting the delivery of Scotland and the UK’s net zero targets. The programme comprises nine significant onshore and subsea projects, including EGL2.


Prysmian’s progress


The EGL1 and EGL2 preferred supplier awards are among a number of recent successes reported by Prysmian Group. These include: A contract from Terna for the 250 km 1000 MW Adriatic Link HVDC project which will see subsea cables deployed in the Adriatic Sea to increase exchange of power between the central-southern and central-northern areas of Italy.


A capacity reservation agreement with Marinus Link Pty Ltd, a subsidiary of the Australian TSO TasNetworks, for a new power interconnector between Tasmania and Victoria, Australia. Successful installation and HV testing of 1400 km of submarine and land cables comprising the 765 km long UK–Denmark Viking Link Interconnector. A joint venture of National Grid and Energinet , it will be the world’s longest operating HVDC interconnector when it enters service, anticipated to be by the end of 2023. Selection by Amprion as preferred bidder for Germany’s BalWin1 and BalWin2 offshore grid wind connection systems and DC34 underground cable project, and signing of cabling contracts with 50Hertz for LanWin3 and part of NordOstLink (see below). Prysmian is also the cable supplier for NeuConnect, see p29.


50Hertz signs major contracts with NKT and Prysmian


On 29 September, 50Hertz signed “project and framework contracts” with NKT and Prysmian for the production and installation of 3500 km of submarine and land cables, with an option for an additional 2700 km – contract volume some 4.6 billion euro.


The awards are for 525 kV cable systems, 2 GW per system, for seven transmission projects in Germany. These are legally enshrined in the Bundesbedarfsplan or envisaged in the draft of the Netzentwicklungsplan 2037/2045 (2023), with operation expected in the mid 2030s.


NKT is responsible for five of the seven projects, with a volume of 3.5 billion euros.


In the Baltic Sea, NKT is to supply the cables for the offshore grid connection systems of the Ost-2-4 area (Ostwind 4) off the island of


28 | October 2023| www.modernpowersystems.com


Rügen and for the German part of the Bornholm Energy Island project. It will also install the cables on the seabed. Bornholm Energy Island is being implemented by 50Hertz together with Energinet. In the North Sea, NKT will provide cable for the LanWin 6 (NOR-13-2 area) offshore grid connection system as well as the DC 32


(NordOstLink+) onshore HVDC connection between Pöschendorf in Schleswig-Holstein and Klein Rogahn near Schwerin in Mecklenburg- Western Pomerania.


LanWin 3 (Prysmian)


LanWin 6 (NKT)


Pöschendorf


Schleswig- Holstein


Kiel Heide


NordOstLink (Prysmian)


NordOstLink+ (NKT) Hamburg Niedersachsen


SuedOstLink+ (NKT) Sachsen-Anhalt


Hannover Umspannwerk Wolmirstedt Magdeburg Berlin Schwerin


Ostwind 4 (NKT)


Bornholm Energy Island (NKT)


Lubmin


Mecklenburg- Vorpommern


NKT has also been contracted for the SuedOstLink+ (SOL+) HVDC project. This will start at Klein Rogahn and join with the SuedOstLink (SOL) in Wolmirstedt near Magdeburg, where construction is sbout to start. NKT is already responsible for the production and installation of cables for SOL.


Bornholm


Prysmian was awarded the contract for a lot consisting of cabling for the LanWin 3 (NOR-11-1 area) offshore connection system in the North Sea and for the eastern part of onshore HVDC link DC 31, NordOstLink (NOL), which is to start from the Heide area in Schleswig-Holstein and run mostly on the same route as NOL+.


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