UK and Norway complete world’s longest subsea electricity cable

The world’s longest submarine electrical cable will be turned on this week as testing of a 720km interconnect that exchanges power between the UK and Norway begins.

Electricity will begin to flow through the € 2 billion North Sealink within a few days, and a joint venture between the National Grid in the United Kingdom and Statnett in Norway will officially begin operations in October.

Interconnector Is an important part of UK’s strategy to reduce emissions and promote offshore wind, allowing the UK’s grid to share or import electricity on demand and supply.

The cable will allow the UK to “maximize the use of renewable energy and large hydropower networks in Norway” to replace electricity from fossil fuels, said Nigel Williams, construction director at North SeaLink. I did.

This cable can carry 1.4 GW of power, which is about the same as the capacity of a nuclear reactor.

On windy days when Britain has excess electricity from offshore wind, cables allow it to export electricity to Norway. On calm days, the UK can import electricity from Norwegian hydropower.

This can help lay the foundation for larger interconnect projects in the future. Sun cable Between Australia and Singapore IceLink Between Iceland and England.

The cables are connected, laid and buried on the seabed. The test will start this week in a low voltage setting and then ramp up to a high voltage in the coming weeks.

According to Williams, the most difficult part of the engineering project was laying cables in the North Sea and the Norwegian fjords. A dedicated cable laying vessel capable of carrying 10,000 tons of thick cables cannot operate in bad weather.

“Laying cables in the North Sea was a bit of an unknown challenge, especially with weather-related engineering costs,” says Williams.

The project also needed to build a dedicated barge for laying cables on remote Norwegian lakes.

Now that the cables have been installed, it is expected that they will remain installed for the next 50 years or so. “It’s like a sea sausage,” Williams said. “The cable is static — it’s just there.”

The 50-50 joint venture between Statnett and National Grid will split revenue evenly between the two companies.

As the UK becomes more dependent on intermittent power sources such as offshore wind, more interconnects will be needed to balance power supply and demand.

Interconnectors supplied approximately 8% of UK electricity in 2019. This is expected to rise to 19% within the next five years.

Recent government energy White paper The country estimates that it will need 18 GW of interconnect capacity by 2030, from about 6 GW currently in operation.

The next interconnect on the National Grid, the Viking Link, will connect the United Kingdom and Denmark in 2024. ElecLink, a cable connecting France and the United Kingdom through the Channel Tunnel, is scheduled to be completed next year.

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UK and Norway complete world’s longest subsea electricity cable Source link UK and Norway complete world’s longest subsea electricity cable

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