Electricity transmission

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Work begins in Lincolnshire on world's longest subsea power cable Jillian Ambrose; The Guardian; 13 Jul 2020

€2bn, 475-mile Viking Link cable will share renewable energy between UK and Denmark

Construction work has begun in Lincolnshire on the world’s longest subsea power cable, which will run between Britain and Denmark to share renewable energy between the two countries.

The 475-mile (765km) cable is a joint-venture between National Grid in the UK and Denmark’s Energinet. By 2023, the high-voltage, direct-current link will transmit the equivalent of enough electricity to power 1.5m British homes between Bicker Fen in Lincolnshire and the South Jutland region in Denmark.

The €2bn Viking Link project will surpass the 450-mile North Sea link, which will begin importing Norwegian hydropower to the UK from 2021.

Viking Link is one of several new super-cable projects, which are each considered a significant step towards the UK’s goal of net-zero carbon emissions because National Grid will be able to tap more renewable energy resources to replace fossil fuels.

The UK has about 5GW of power cable capacity connecting Britain’s electricity system to power generated in the Netherlands, France and the Republic of Ireland. By the middle of the decade, this capacity is expected to rise fivefold to 25GW through a string of projects including more subsea cables to France and Ireland as well as new connections with Norway, Denmark, Germany and Belgium.

A more ambitious project has been proposed to connect Britain to Iceland via a 620-mile subsea cable, but progress on these plans has been slow.

1.5 million "homes" @ 0.5kW/home = approx 0.75 GW or 750 MW
€2bn / 765km = €2.6 million/km
€2bn / 750MW*765km = €3500 / megawatt-kilometre

With Brexit looming, energy sector builds new links to Europe Adam Vaughan; The Guardian; 18 Aug 2018

Thanks to new interconnectors, imports could soon account for fifth of UK electricity needs

Today, four cables – known as interconnectors – between the UK and Ireland, France and the Netherlands have a capacity of 4GW, providing around 6% of Britain’s power supplies. However, with 11 new connections linking the UK and other European countries either under construction or mooted by developers, imports could provide more than a fifth of the country’s electricity needs by 2025, the government expects.