Thurso South substation is located near Geiselittle, west of the A9, two miles south of Thurso. Its equipment enables power to be transferred between circuits operating at 33kV, 132kV and the new 275kV spine of the transmission network that runs between Dounreay and Spittal. Construction of the substation began in June 2015 and, at its peak, saw a workforce of 220 employed on the site.
The upgrade to the spine of the onshore transmission network in Caithness is a key element in the wider Caithness-Moray transmission reinforcement.
The construction of the new substation involved 80,000 cubic metres of fill material – enough to fill 32 Olympic-sized swimming pools. 75,000 metres of cabling has been installed within the site, connecting 240 items of plant, 72 control panels and 4 transformers.
The high-point of the construction involved the landing at Scrabster Harbour of 2 supergrid transformers, comprising 6 large transformer sections and 14 HGV loads of crates with a combined weight of 700 tonnes.
The transportation through Thurso Town was carefully coordinated via engagement with the police, Transport Scotland and the Highland Council. The timings of the journeys were planned to minimise disruption to the town, with many locals who witnessed the transit enjoying the spectacle.
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