SA Power Networks is today energising the second of two purpose-built substations to power the tunnel boring machines on the $15.4 billion Torrens to Darlington project.

The Richmond East substation will provide a unique 22,000-volt supply specifically to suit the tunnel boring machine which will be used to construct the 2.2km long northern twin tunnels, from Mile End to Thebarton.

The substation’s capacity is the equivalent of powering 5000 new homes and will be dedicated to the tunnel boring machine. Once tunnel construction is complete, the substation will then power the ventilation and lighting systems of the tunnels. The substation has been constructed with two transformers 
and two control rooms to ensure continuous operation of this vital project and piece of road infrastructure.

The substation project has been completed ahead of time, on budget and without any safety incidents. More than 100 SA Power Networks staff have been involved in the project, ranging from designers, engineers and civil contractors to general labour, skilled trades people, and electricians. The project has also provided a valuable and unique experience for apprentices.

The Torrens to Darlington Project is the final 10.5km section of the North-South Corridor, and will complete 78km of non-stop, traffic light-free motorway between Gawler and Old Noarlunga.

SA Power Networks COO Mark Vincent said SA Power Networks was playing a key role in this once in a generation project that will make a major contribution to the growth of the South Australian economy.

“The Richmond East substation represents an excellent example of the collaborative working relationship between SA Power Networks and the Department for Infrastructure and Transport,” Mr Vincent said.

“As the owner and operator of South Australia’s poles and wires network, our ability to deliver this vital piece of infrastructure safely and on time demonstrates the value of being involved right from the detailed planning stage.

“The delivery of two substations within compressed timeframes is significant in the context that SA Power Networks on average builds just one substation every three years.

“We are proud that the excellent work of our team is now allowing South Australia’s largest ever road infrastructure project to proceed to its next crucial phase.”

The Richmond East substation is the second major piece of electrical infrastructure SA Power Networks has established for this project. The other, a substation at Tonsley East, was energised in January 2024 and will power the tunnel boring machines for the 4.4km long southern twin tunnels.