Transgrid is proposing to deliver a new 330 kV (kilovolt) transmission line between the existing Mount Piper and Wallerawang substations, located in the LGA of Lithgow and on the lands of the Wiradjuri people.

The Mount Piper to Wallerawang Transmission Line Upgrade Project will carry out upgrades to our transmission network in the State’s Central Tablelands to support the NSW Government’s delivery of the Central-West Orana Renewable Energy Zone (REZ).

What are we building?

We will:

  • build a new 330 kV transmission line between our existing substations located at Mount Piper and Wallerawang
  • install switchbays and associated equipment within both substations to connect the new transmission line.

Project benefits

If approved, the project will deliver a range of benefits including:

  • Cheaper electricity – improving the affordability of electricity for consumers by increasing supply and driving down electricity prices
  • Improved reliability – by delivering large amounts of new energy and, strengthening and reinforcing the grid in the local region
  • Reduced emissions and a greater mix of renewable energy in the National Electricity Market
  • New local jobs – opportunities for local workers and businesses during construction

Our preferred route

Transgrid listened to feedback from community and stakeholders in identifying and assessing routes for this project and are grateful for feedback provided. Following Transgrid’s route selection process, community input and assessment of route options, we have identified a preferred route.

The selected route minimises visual impact for community and the local township and balances landowner preferences and various constraints including engineering, constructability, environmental impacts and cost, to ensure that the outcome is prudent and efficient. The report can be accessed in the resources section on this page.

B4 Indicative map

Transgrid recognises the vital role that stakeholders, landowners and the community have in the planning and delivery of its projects. We are committed to engaging with stakeholders to understand what’s important and work out the best possible solution.


We are seeking your feedback on the preferred route for the project.

To gain more information on the project and preferred route drop in to meet the team and ask your questions at the following information sessions: 

Lithgow Show, Tony Luchetti Showground

Friday 15 March 2024, between 2pm - 4pm

Wallerawang Library Front Entrance, 40 Main Street, Wallerawang

Saturday 16 March 2024, between 10am - 12pm

To provide feedback and stay informed you can also:

  • Email us or call our community information line - see our contacts below.
  • Sign up for newsletter updates
  • Share your feedback and ideas at our drop-in community information sessions, which will be announced shortly.

Contact us

Community Information Line: 1800 222 537 (free call)
Email: community@transgrid.com.au


  • Project announcement and early community and stakeholder engagement begins - Completed


  • Proposed route option released for consultation - Completed

    End of 2022

  • Preferred route option selected and Environmental Assessment process starts - In progress

    End 2024

  • Project determination - Proposed

    Late 2024

  • Construction works - Proposed


  • Project commissioning - Proposed


Community Partnerships Program

Our Community Partnerships Program is designed to help not-for-profit groups to deliver initiatives that will have a tangible and lasting impact on local communities.

We will be launching a new round of grants in March 2024. Please contact us for further details.


Project overview


PDF 1.59 MB

Mount Piper to Wallerawang Preferred Route Report


PDF 3.23 MB

Fact sheets


PDF 4.16 MB

Wollar substation upgrade

EnergyCo is proposing to build a new switching station at Wollar, to connect the project to Transgrid’s existing transmission lines. Transgrid continues to work with EnergyCo on coordinating the planning for these proposed works.

If you have questions regarding the development of new transmission lines and substations for the Central-West Orana REZ please visit the EnergyCo website or contact EnergyCo on 0482 061 006 or email info@cworez.net.au

EnergyCo Contact

If you have questions regarding the development of new transmission lines and substations for the Central-West Orana REZ please visit the EnergyCo website or contact EnergyCo on 0482 061 006 or email info@cworez.net.au