It was called “Viking Link” or Viking Link in its original language. It is a cable that carries high voltage between Denmark and the United Kingdom, back and forth. It is the world’s longest submarine cable between countries, to date.
Submarine cable provides clean energy to Denmark and the United Kingdom
The Viking Link is an undersea cable that transports high-voltage energy across its more than 765 kilometers long. However, it was not an easy task to accomplish and posed real engineering challenges. Its immersion in the North Sea, one of the shallowest seas, made human ingenuity go to extremes to avoid possible damage and even sabotage.
The cable itself weighs about 40 kilograms per meter, and will transport electrical energy produced in the wind power plants of both countries.

The cable works back and forth, how? When Denmark needs more energy and there is a lot of wind in the United Kingdom, the energy “travels” to the Nordic country. When the opposite happens, a switch is activated to change the direction of the energy.

The cable will be operational before the end of 2023. The last section was completed being installed offshore last July. A ship, the Leonardo Da Vinci, was used in the anchoring operation, where the different sections were skillfully joined together before submerging them in the waters of the North Sea.
This mega structure takes on a greater dimension, since the high-voltage energy it transports is “clean energy,” produced in wind farms that the two countries own. Denmark and the United Kingdom joined forces to consume electricity without carbon emissions as a commitment for 2030 and 2035. However, as is the case around the world, neither of them can supply only clean energy to meet demand. Although, undoubtedly, they are on the right path to achieve it.
The Viking Link is the solution to the problem of not being able to store clean energy
One of the biggest problems with renewable energy is that it cannot be stored. Both solar energy, which depends on a clear day, and wind energy, which depends on the wind, cannot be “saved” for later use.
The Viking Link is like an energy highway that solves this problem. It unites the two countries across the sea. Its construction began in 2019 and involved a very large human effort in hours of work and engineering. The cable is made of steel and copper and its covering is paper and plastic. The total cost of the investment was 2.3 billion dollars. The time difference between the two countries means that the peaks of energy use do not coincide, since they occur at different times.
It should be noted that having the privilege of being the longest high-voltage electrical power cable in the world will be for a short time. Soon, the Australia-Asia Power Link will surpass it. The new cable will connect Darwin in Australia with Indonesia and Singapore and will be much longer than the Viking Link. It will be about 4,200 kilometers long and will fulfill the same function.