SSEN Transmission has completed a grid upgrade project in northern Scotland that will support the connection of new renewable capacity in the area.
The utility has installed an electricity substation north of Lairg and overhead lines to connect it into Loch Buidhe substation.
SSEN Transmission, along with contractors Balfour Beatty and Wood Group, has been working on the project since 2019 to construct the new transmission infrastructure.
Work included constructing a new 132kV substation at Dalchork, approximately 3 km north of Lairg, along with replacing the existing cables on top of the existing pylons between Cassley and Lairg.
Around 16 km of 132kV overhead line was built from the new substation at Dalchork to the Loch Buidhe substation, near Bonar Bridge.
Now all new assets are in place and operational, the old 132kV overhead lines and 36 towers between Lairg grid supply point (GSP) substation and Shin substation at Inveran will be decommissioned and removed to reduce the amount of electricity infrastructure in the area.
The new substation at Dalchork also incorporates the Creag Riabhach wind farm overhead line connection, which was completed in 2022.
Careful consideration has been made to preserve the scenic area in which Dalchork substation is located, with the substation itself being built into the slope of the land so it is naturally screened by the landscape.
The new substation has been designed with space available to accommodate any future renewable energy developments in the area, with the platform built to ensure that any additional equipment to be sited at Dalchork can be done so with minimal future works required.
The area around the site has also been replanted with native tree species as well as seeded with local wildflowers which will not only help with visual impact but also encourage greater biodiversity in the area, allowing local flora and fauna to flourish, in line with SSEN Transmission’s commitment to deliver biodiversity net gain on its projects.
Extensive environmental work took place to ensure SSEN Transmission’s impact on the local wildlife, fauna and flora was kept to a minimum at all times during all phases of the project.
Helicopters were used to fly in and deliver materials during the construction of the Creag Riabhach overhead line connection to reduce the amount of heavy machinery crossing sensitive peatland.
Wooden crates used to store components for the new overhead line were repurposed and turned into 54 nesting boxes for owls and kestrels installed across northern Scotland, with one box already creating a home for two healthy tawny owl chicks.
Andy McLaren, SSEN Transmission Lead Project Manager, said: “Completing the full package of work at Dalchork Substation and the overhead line between Lairg and Loch Buidhe is a huge achievement, with the teams working through some particularly challenging weather conditions, difficult terrain and the impacts of the covid pandemic in the early stages.
“From the very start it’s been really important to us that we take care of the surroundings in which we operate, with extensive environmental management plans in place form the beginning and an ecologist on site during critical stages of the main construction build.”