The Viking Link interconnector - National Grid bets on cross-border green power

The Viking Link interconnector is the kind of kit you feel before you see: a thick HVDC cable disappearing under the wet sand of a Lincolnshire beach, seabirds wheeling overhead while construction crews secure the last sections before energization. It is one of National Grid’s most ambitious cross-border energy projects.

What Viking Link actually is

Viking Link is a high-voltage direct current (HVDC) electricity interconnector between the UK and Denmark with a capacity of around 1.4 gigawatts and a total route length of about 760 kilometers. It links the British transmission system at Bicker Fen in Lincolnshire to the Danish grid near Revsing in southern Jutland.

The project is a joint venture between National Grid and Danish system operator Energinet, designed to move low-carbon power both ways depending on price and demand. On cold, still evenings in England, surplus Danish wind can flow west; on blustery nights in the North Sea, UK offshore wind can head east to Denmark.

Route, technology and capacity

From Bicker Fen, underground cables run some 67 kilometers to the landfall point at Sutton-on-Sea on the Lincolnshire coast. The subsea cable then crosses the North Sea for approximately 623 kilometers before reaching the Danish shoreline, where onshore cables complete the link into Energinet’s network.

Viking Link uses ±525 kV HVDC technology to limit losses over long distances. Converter stations at each end of the cable convert alternating current from the transmission systems into direct current and back again, allowing synchronized but separate grids to trade power without needing identical frequency control.

How the project evolved

National Grid first signed a cooperation agreement with Energinet for Viking Link in 2016, after several years of feasibility studies and regulatory dialogue. The UK planning process, including consent for cable routes and converter stations, took multiple rounds of consultation with local communities in Lincolnshire.

Construction began after final investment decisions and regulatory approvals were secured in both countries. Work included trenching for onshore cables, horizontal directional drilling for landfall sections, and specialized cable-laying vessels for the offshore route across the North Sea.

Voices behind the cable

On the UK side, National Grid’s senior leadership under chief executive John Pettigrew has repeatedly highlighted interconnectors like Viking Link as crucial for balancing growing renewable capacity. Pettigrew has pointed out that moving clean power between markets helps keep bills lower over time and cuts emissions.

Project directors and engineers, such as National Grid’s interconnector program leads, have had to manage detailed marine surveys, seabed preparations, and coordination with fisheries and maritime authorities. The Danish side, overseen by Energinet’s management team, has similarly stressed Viking Link’s role in integrating Nordic and continental power flows.

Why investors and consumers should care

For British and Danish consumers, Viking Link expands the pool of available low-carbon electricity, helping both countries smooth out periods of low renewable output. When Danish wind farms generate more than local demand, excess power can move to the UK; during UK surplus, the flow can reverse.

This flexibility can reduce reliance on gas-fired generation, particularly during winter peaks. It also provides additional trading options for utilities and power traders, who can arbitrage price differences between the UK and Nordic/continental markets via the interconnector.

Regulation and earning model

The interconnector operates under a cross-border regulatory framework, with revenues derived from congestion rents – essentially the price difference between the two markets multiplied by the transferred volume. Capacity is allocated via auctions and market mechanisms overseen by transmission system operators and regulators.

For National Grid, Viking Link is part of a broader regulated and quasi-regulated asset base that includes other UK interconnectors and transmission infrastructure. While returns are moderated by regulatory oversight, they are typically long-term and relatively stable, which tends to appeal to income-focused investors.

Environmental and community aspects

To minimize visual impact, much of Viking Link’s infrastructure is buried or housed in converter stations rather than overhead lines. The cable route across Lincolnshire was chosen after environmental assessments and public consultations to reduce effects on sensitive habitats and farmland.

Offshore, detailed geophysical surveys and environmental studies helped determine the subsea path, seeking to avoid key marine ecosystems and limit disturbance to shipping lanes and fisheries. During construction, timing windows and mitigation measures were applied to protect wildlife where possible.

Grid strategy beyond Viking Link

Viking Link sits alongside other interconnectors where National Grid has stakes, including links to France, the Netherlands, and other neighboring systems. Together they form a portfolio that increases the UK’s connection to continental and Nordic electricity markets.

This strategy aligns with broader European goals of integrating power markets and supporting decarbonization, as cross-border flows help absorb variable renewables and reduce the need for backup fossil capacity. For National Grid, it also provides optionality as the company navigates changing policy and demand patterns in the UK and Ireland.

Layer C: Context and the stock

As an individual product, the Viking Link interconnector will never sit in a shop window, but it quietly underpins the transition to a more flexible, cross-border electricity system for the UK and Denmark. For holders of infrastructure-heavy portfolios, understanding assets like this helps gauge long-term earnings resilience at transmission operators.

The National Grid PLC stock is listed in London, and interconnectors such as Viking Link contribute to its regulated and semi-regulated asset base over the coming decades.