Rønne-Rødvig

Overview

Rønne-Rødvig is a domestic submarine cable system connecting two points within Denmark. With a total length of 153 km, it runs entirely within Danish waters, linking the island of Bornholm to the eastern coast of Zealand. The cable serves an intra-Danish corridor, providing a subsea connection between two Danish communities separated by the Baltic Sea.

Route and Landings

In Denmark, the cable lands at two points: Rødvig, located on the southeastern coast of Zealand, and Rønne, the main port town on the island of Bornholm. These two landings represent the full extent of the system's geographic reach.

Ownership and Operators

Rønne-Rødvig is owned by TDC Group, Denmark's principal telecommunications provider. TDC Group operates a broad range of fixed and mobile network infrastructure across Denmark and the Nordic region.

Status and Timeline

The cable was ready for service in 1989, making it one of the earliest submarine cable systems to land in Denmark. As of today, the system has been operational for approximately 37 years, placing it among the longer-serving cables in the Danish corridor.

Regional Context

Denmark hosts 23 submarine cables across 30 landing points, with an average cable length of 370 km. At 153 km, Rønne-Rødvig is shorter than the national average but is longer than 56% of the other cables touching the same countries in its corridor. Among regional peers, the cable predates most others connecting to Denmark by a considerable margin. Systems such as COBRAcable (RFS 2019), Hronn and Havhingsten/North Sea Connect (both RFS 2022), and Aurora (RFS 2024) represent considerably more recent additions to the corridor, while Rønne-Rødvig's 1989 service date makes it the earliest recorded submarine cable landing in Denmark. The cable's 153 km length is modest compared to corridor peers such as Havfrue/AEC-2 at 7,650 km, reflecting its focused domestic rather than international purpose.

Strategic Role

By connecting Bornholm — a Danish island situated in the Baltic Sea at some distance from the Danish mainland — to the coast of Zealand, Rønne-Rødvig provides a direct subsea telecommunications link for an island community that cannot rely on overland infrastructure. The two-landing configuration reflects the cable's targeted function: sustaining connectivity between Rønne and the mainland landing at Rødvig across the open water separating them.