Planning for Singapore's long-term network reliability

When completed by 2019, the underground transmission cable tunnel project will play an integral part of SP Group’s long-term plan to secure reliable and efficient electricity supply for Singapore. It will enable SP to plan and anticipate future network requirements. It will also allow us to install, repair and replace aging assets, and upgrade our network efficiently, with minimal inconvenience to the public.

Constructions on this project started in 2012. Comprising three underground tunnels spanning 40km around Singapore, the tunnels were constructed at a depth of 60 meters below ground (the “height” of a 20-storey building) to minimise the congestion of underground utility services. These are the deepest tunnels to be ever constructed in Singapore, and will house 1,200km of extra-high voltage cables.

The tunnels consist of:

  • The North-South Tunnel – 18.5km tunnel from Gambas to May Road
  • The East-West Tunnel – 16.5km tunnel from Ayer Rajah to Paya Lebar
  • The Jurong Island-Pioneer Tunnels – 5km tunnel from Benoi to Jurong Island

Built to last 120 years, the tunnels will allow Singapore to be equipped with optimal electricity supply infrastructure for the future and ensure that the nation will continue to have one of the best performing electricity networks in the world.


Watch this video to find out more about the transmission cable tunnel project.

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