Two 29-tonne electricity transformers made the 4mph journey from the harbour to Beau Sejour, where they will supply a quarter of the island's power when switched on.
The 20MVA electricity transformers were delivered to Beau Sejour by Guernsey Electricity this week as part of the final stage of a network enhancement project.
Many onlookers will have seen the transformers making the slow-motion journey from the White Rock, to the roundabout at St Julian's Avenue, along Glategny Esplanade, the Longstore, Rouge Rue and up to Beau Sejour.
The project, which began in March 2021, will supply around 25% of the island’s electricity, primarily in the St Peter Port area.
This includes residential properties, offices, shops and Beau Sejour, representing around a third of Guernsey Electricity’s customers.
“This installation forms an important part of the continual investment in our existing infrastructure," said Jon Sexton, Head of Engineering and Design at Guernsey Electricity.
"It will future proof our local electricity network, provide extra resilience along with enhanced capacity to meet a more electric future and the switch from fossil fuels."
The new substation will be commissioned in November 2021.
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