A large concrete platform with four pillars is standing above the water

Troll A (Norway)

A 472-metre-high giant in the North Sea

Troll A is a gas production platform and the pinnacle of the Norwegian condeep concept: moveable deepwater concrete structures. It is located in the Norwegian Troll gas field in the North Sea.

With a total height of 472 meters, and a subsea structure of concrete measuring 369 meters, it is the highest concrete platform ever constructed for the oil and gas sector. In fact, it is the largest construction ever moved on the planet.

The construction contract was awarded by Shell Norway to Norwegian Contractors (NC) in March 1991. It took a little more than four years to construct the gigantic supporting structure, and 2,000 people were involved in the construction at Vats in Rogaland, Norway.

A total of 245,000 m³ concrete were delivered by Heidelberg Materials.

Project Data

  • Shell Norway

    Owner

  • Norwegian Contractors (NC)

    Contractor

  • 1994

    Completion

A large concrete platform with four pillars is standing above the water

Troll A, Norway. Troll A, Norway, is the highest concrete platform ever constructed for the oil and gas sector.

Oyvind Hagen, Statoil ASA

Aerial view of the Troll A oil platform under construction, surrounded by multiple ships on a large body of water. A mountainous landscape is visible in the background.

Troll A, Norway. Troll A, Norway, is the highest concrete platform ever constructed for the oil and gas sector.

Statoil/Shell

A group of individuals stands on a helipad by the sea at either sunrise or sunset, indicated by the soft lighting and long shadows. The helipad is marked with the number “10” and has markings suggesting it is used for helicopter landings.

Troll A, Norway. Troll A, Norway, is the highest concrete platform ever constructed for the oil and gas sector.

Heidelberg Materials

The interior of the Troll A oil platform, a large cylindrical structure, with multiple metal beams and scaffolding. A worker wearing a hard hat and reflective vest is visible in the foreground, indicating an industrial or construction setting.

Troll A, Norway. Troll A, Norway, is the highest concrete platform ever constructed for the oil and gas sector.

Harald Pettersen, Statoil ASA

A large concrete platform with four pillars is standing above the water

Troll A, Norway. Troll A, Norway, is the highest concrete platform ever constructed for the oil and gas sector.

Oyvind Hagen, Statoil ASA

Aerial view of the Troll A oil platform under construction, surrounded by multiple ships on a large body of water. A mountainous landscape is visible in the background.

Troll A, Norway. Troll A, Norway, is the highest concrete platform ever constructed for the oil and gas sector.

Statoil/Shell

A group of individuals stands on a helipad by the sea at either sunrise or sunset, indicated by the soft lighting and long shadows. The helipad is marked with the number “10” and has markings suggesting it is used for helicopter landings.

Troll A, Norway. Troll A, Norway, is the highest concrete platform ever constructed for the oil and gas sector.

Heidelberg Materials

The interior of the Troll A oil platform, a large cylindrical structure, with multiple metal beams and scaffolding. A worker wearing a hard hat and reflective vest is visible in the foreground, indicating an industrial or construction setting.

Troll A, Norway. Troll A, Norway, is the highest concrete platform ever constructed for the oil and gas sector.

Harald Pettersen, Statoil ASA