Upgrading the Flekkerøy tunnel for Agder Fylkeskommune

OneCo has been the main contractor with overall responsibility for the upgrade of the Flekkerøy undersea tunnel. OneCo delivered all the electrical work itself, while coordinating and performing a number of other critical tasks to ensure that the project is completed with high quality and precision. The tunnel connects Flekkerøy with Kristiansand. It is one of very few tunnels open to pedestrians and cyclists, and opened in 1989. In 2022, the tunnel received a long-awaited upgrade.

This project is a good example of our ability to manage complex projects that require extensive planning, precision and collaboration.

Customer: Agder County Council
Project period: 2022 - 2024
Project value: 100 million kroner
Number of hours: 16,000 hours

Main tasks include:

• Extensive engineering: Including responsibility for safety documentation and FMV
• Traffic management: Responsibility for the safe flow of traffic throughout the construction period
• Expansion of technical buildings: Expansion of three technical buildings
• Blasting and securing: Execution of blasting and securing of three niches, including water and frost protection
• Installation of emergency containers: Installation of three emergency containers for increased safety
• Tunnelling: Replacement of lighting to LED, upgrading of fans, and installation of new emergency stations and escape lights
• Operation and maintenance: Maintenance and operation of safety equipment throughout the duration of the project
• Camera surveillance: Adding IR cameras and upgrading the SRO system