Work on the first pipeline was finished six months ago. Now shareholders in Nord Stream have asked the company to examine the possibility of building two more pipelines, according to Swedish Radio News.
Nord Stream has been the subject of intense political debate here in Sweden, with some concerned about the environmental impact of the project, and others worried that the Russian military will install surveillance equipment on the pipeline, close to Swedish waters.
The idea behind the Nord Stream pipeline was to reduce Russia's dependence on Ukrainian pipelines, which in the past have been shut during gas disputes between Moscow and Kiev.
80% of Russia's gas exports to the EU flow through pipelines across Ukrainian soil.