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Morgan Sindall Infrastructure

Gremista Underground Cable and Grid Supply Point

The Gremista underground cable and grid supply point project has connected Shetland to the electricity grid for the first time, allowing the Island to take advantage of the renewable power generated on the Island. 

Aerial view of an industrial port with buildings, ships docked at piers, and surrounding water, fields, and hills.
Aerial view of two large green warehouse-like structures surrounded by vehicles and temporary buildings, with wind turbines in the distance.
Aerial view of a wind turbine on green hills with an industrial area in the distance under cloudy skies.
Aerial view of three green industrial buildings surrounded by construction equipment and vehicles within fenced boundaries, set against hilly terrain.
Aerial view of a coastal town with a harbor, showing large ships docked at the port, surrounded by industrial buildings and green hills under a partly cloudy sky.
Aerial view of three green industrial buildings surrounded by construction equipment and vehicles within fenced boundaries, set against hilly terrain.
Two individuals in safety gear stand on a rocky hill overlooking a coastal town with docked ships; a Morgan Sindall-branded vehicle is partially visible.
Two individuals in safety gear stand on a rocky hill overlooking a coastal town with docked ships.
Three individuals in high-visibility jackets labeled "Morgan Sindall" walk along grassy terrain beneath power lines under a partly cloudy sky.
Aerial view of a wind farm with turbines spread across hilly terrain and a large building complex nearby.
Aerial view of a wind farm with multiple turbines across hilly terrain; a large building complex is visible near the center.
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Aerial view of a rural construction site with an excavator working on a dirt road, surrounded by grassy patches, soil, and scattered construction materials.
Two workers stand on a gravel path overlooking a coastal townscape with harbor, buildings, and grassy hills; a “Morgan Sindall” utility vehicle is parked nearby.

Project overview

The project consisted of two distinct sections: the Underground Cable (UGC) element and the grid supply point (GSP). 

The team installed ducting and cabling to carry three sections of new double circuit 132kV UGC between Kergord substation GIS Building and the new Gremista Supply Point substation. These circuits are designated KG and KG2.  

  • Section one: runs from Kergord substation for approx. 6km to a new wood pole.  
  • Section two: connects two wood poles, approx. 1km apart.  
  • Section three: runs between a two new wood poles, to the Gremista GSP, for approx. 4km. 

The ducting and cabling for the project runs circa 11km through environmentally sensitive areas of peatland and the Sandwater Loch.  

The works at the new Gremista substation was undertaken using a new platform created as part of the mobilisation works. The activities required to construct the new substation include:  

  • Construct two grid transformer buildings including 132kV/ 33kV transformers and associated 132kV AIS equipment.  
  • Construct the control building including control room, 33kV GIS hall, Telecom room, metering room, battery room and welfare facilities. 

Customer:

SSEN Transmission

Location:

Shetland Islands

Date:

September 2025

Fun fact: Shetland is the northernmost part of the UK and is actually closer to Norway than mainland Scotland!

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