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).

We will build a new 300 kV transmission line between our existing substations located at Mount Piper and Wallerawang.

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.

Environmental Impact Statement (EIS)

The Mount Piper to Wallerawang Transmission Upgrade Project will follow a comprehensive environmental assessment process. During 2024, Transgrid will conduct an assessment of environmental considerations such as heritage, biodiversity, water catchments, land use, air quality, noise, traffic and transport, visual amenity and much more. The assessment will be documented in an Environmental Impact Statement (EIS) and placed on public exhibition.

Transgrid have now competed the first step in the environmental assessment process and have submitted the Scoping Report to the Department of Planning Housing and Infrastructure. This document is available to view on the NSW Major Project Planning Portal at: Mount Piper to Wallerawang Transmission | Planning Portal - Department of Planning and Environment (nsw.gov.au)

The image below shows the approvals pathway the project will follow up to 2025.

Community information sessions

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: 


Date & Time Location
Friday 15 March 2024, between 2pm - 4pm Lithgow Show, Tony Luchetti Showground
Saturday 16 March 2024, between 10am - 12pm Wallerawang Library Front Entrance, 40 Main Street, Wallerawang

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.

Local community groups can apply for grants of up to $5000. The application period is now open for submissions, between 25 March to 30 April 2024.


Project overview


PDF 1.59 MB

Mount Piper to Wallerawang Preferred Route Report


PDF 3.23 MB


PDF 1.36 MB

Fact sheets


PDF 356.33 KB

Wollar substation upgrade

EnergyCo is proposing to build a new switching station at Barigan Creek as part of the Central West Orana REZ project. Transgrid will construct 500 kV towers to facilitate cutting-in of Barigan Creek, and is proposing upgrades at Transgrid substations located at Wollar, Bayswater and Mount Piper to enable these 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 cwo@energyco.nsw.gov.au.



Mount Piper to Wallerawang

11 March 2024

Community encouraged to attend information sessions for Mount Piper to Wallerawang Transmission Line Upgrade Project

Members of the community are being encouraged to attend local information sessions to provide feedback on the preferred route for the proposed Mount Piper to Wallerawang Transmission Line Upgrade Project.