Finding the best route for Sweden’s new energy infrastructure

Zooming in to get the wider picture

Before determining the exact alignment, a long list of parameters must be considered. These include natural and cultural environments, residential environments, technical conditions, defence interests, buildability, landscape impact and spatial planning. The aim is to ensure that the line has as little impact on their surroundings as possible. 

An important aspect is assessing biodiversity and identifying alternative alignments that protect rare or sensitive environments and species. COWI is part of the team – armed with magnifying glasses and binoculars – that surveys and catalogues the natural environment around Karlstadbenet. 

“Our fieldwork results in maps highlighting areas important to preserve,” says Niklas Albertsson, Specialist in Natural Environment at COWI. “If sensitive environments are found on both sides of the existing corridor, alternative alignment may be considered. The current power line was built at a time when biodiversity surveys weren’t conducted the way they are today, so it’s important to document the environment here as well.”

What's in the ground?

The ageing power line presents additional challenges, as the utility poles may have affected the surrounding soil. Specifically, the poles and their pressure-treated wood foundations may have contaminated the soil. Fortunately, geotechnical and environmental experts are on site to investigate this further. 

“Along the entire section, there are a total of 1,500 poles, and we carry out soil investigations at 10% of these,” says Maria Magnusson, Environmental Consultant at COWI. “Using a geotechnical drilling rig, we take samples at different depths and distances from the poles. The aim is to determine what is present in the soil and how it should be handled if contamination is found when the poles are removed.” 

Putting the plan together

The information gathered about the sites will be included in an environmental impact assessment which will be provided to Svenska kraftnät. Tyréns, the lead consultant for the project, is preparing Svenska kraftnät’s documentation for public consultation, which will also feature information gathered by COWI. 

“I am incredibly proud of how we have managed to establish an effective working process within our joint project organisation and in close collaboration with Svenska kraftnät,” says Jessika Ekberg, Project Manager at Tyréns.

Construction of Karlstadbenet is planned to start in 2030, and the project is estimated to be operational by 2035.