Major Contract

NSW Central-West Orana REZ Transmission Project

Detailed Planning
NSW Central-West Orana REZ Transmission Project

The proposed transmission project aims to support the delivery of a pilot Renewable Energy Zone (REZ) in the New South Wales Central-West Orana region.

Transmission lines will run north-west from the existing network near Merriwa, passing south of Dunedoo before connecting to the existing network east of Wellington. The project also includes proposed substation and related infrastructure upgrades.

Transmission upgrades will be required to support the increase in renewable generation and storage in the REZ. The scope and timeline for these upgrades will be determined following a feasibility study being developed by TransGrid with support from the Australian Renewable Energy Agency.

Key Dates

Jan 2024 Expected Construction Commencement
Jul 2025 Expected Construction Completion

Funding contributions

Federal Government

The Federal Government, through ARENA, has committed $5 million towards a $16.2 million feasibility study, to be undertaken by TransGrid, which will assess the technical and commercial options for the development of new high voltage transmission lines to enable the REZ.


Jun 2020 On behalf of the Australian Government, the Australian Renewable Energy Agency (ARENA) committed $5 million in funding to TransGrid to conduct a detailed feasibility study for the project.
Jul 2020 In its 2020 Integrated System Plan, AEMO identified the Central-West Orana REZ Transmission Project as a critical project and provided updated costings for the project. The ISP estimates that the transmission project component of the Central-West Orana REZ has a cost of between $450 million and $850 million, with a modelled cost of $650 million.
Dec 2020 The Central-West Orana REZ Transmission Project was declared Critical State Significant Infrastructure by the New South Wales Government.
Mar 2021 The NSW Government released the Central-West Orana REZ Access Scheme Issues Paper for public consultation. The Paper identifies the key features of the REZ's transmission project.
Procurement approach
Unconfirmed |
New South Wales | National |
Infrastructure Australia status
High Priority Initiative (medium-term, 5-10 years)
Project pages