DC onshore installation of high voltage power cable high

Corridor project, Germany

NKT awarded major HVDC order for the German corridor project, SuedOstLink which will be the world’s first large commercial 525 kV XLPE high-voltage DC 2GW transmission line.

Key facts – the NKT section of SuedOstLink

Principal

50Hertz

Location of the project

Germany

Quality of the order

Cable, accessories and installation of 3 lots of 525 kV HVDC XLPE onshore cable systems with a power rating of 2 GW

Total cable route length

Approx. 275 km

Duration

Awarded in 2020 and completion in 2025.

The German Corridors

Underground HVDC cable systems for sustainable renewable energy integration

Germany’s electricity supply is becoming “greener” every year. The share of renewables in electricity consumption has steadily grown over the last few years. By 2025, 40-45% of electricity consumed in Germany is to derive from renewables and by 2050 it will be 100% generated by renewable sources.

The German Corridor projects are important contributors to the energy transition, also called the “Energiewende”.

The SuedOstLink will play an important role in securing the power supplies to southern Germany over the coming decades. In total the link comprises of 1,100 km cable divided in 5 lots. NKT has been awarded 3 of the lots, covering the northern parts of the link.

NKT President and CEO Alexander Kara says: - I am very pleased that we have booked our largest high-voltage DC order ever by getting a significant part of the SuedOstLink project. This underlines our role as a key partner in the green transformation of Germany. We have worked with 50Hertz on a number of large high-voltage power cable projects over the years, and I am excited that our leading expertise and know-how within 525 kV XLPE high-voltage DC technology is once again recognized by one of our key customers.

HV Cable drum
HVDC Cable

SuedOstLink

The 2 GW SuedOstLink will cover a total of 580 km, from Saxony-Anhalt to Bavaria.

NKT has been awarded the cable and installation contract by the German transmission system operator 50Hertz. The world’s first large commercial 525 kV HVDC XLPE underground cable systems delivered by NKT will cover a route length of approx. 275 km. It will transmit up to 2 GW of power and is important to cover the need for electricity transport in southern as well as northern Germany. In the north of Germany electricity from wind-turbines is produced in large amounts while powerful nuclear power plants in southern Germany will phase out during the coming years.

High voltage DC (Direct Current) cables are ideal for efficient, long-distance power transmission with very low losses. By utilising a cross-linked polyethylene (XLPE) insulation material for the extruded HVDC cable system, it enables power transmissions at significantly higher voltage levels than previously possible. This mean that more renewable power can be efficiently transmitted from the area of generation to the area of consumption.

NKT has a strong footprint in Germany, with facilities in Cologne, Nordenham and Berlin and is therefore ideally located to supply and install the needed solutions for these large corridor projects.

The NKT high-voltage cable factories are powered by 100% green electricity and NKT reduces the environmental footprint even further by mechanical recycling of XLPE material. This contributes to the low carbon footprint of the HVDC XLPE cables over the lifetime and a sustainable power transmission.

Map of SuedOstLink

Being awarded a significant part of the SuedOstLink project underlines our role as a key partner in the green transformation of Germany. I am excited that our leading expertise and know-how within 525 kV XLPE HVDC technology is once again recognized by one of our key customers. Alexander Kara, President and CEO

Portrait shot of NKT CEO Alexander Kara

Innovation

525 kV extruded HVDC cable systems

Doubling power transmission over longer distances

Interior view of innovative testhall in Karlskrona power plant

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