Central-West Orana REZ Transmission Project


Prospective pipeline

Credibly proposed


Under procurement

Preferred bidder announced

Recently closed
Central-West Orana REZ Transmission Project

Prospective pipeline

Greenfield (construction) or brownfield (government asset divestment) projects needed or likely to occur within the next five years, but is not formally proposed by a state, territory or major local government.

Credibly proposed

The project or divestment is supported by a state, territory or major local government, is subject to studies or other processes (such as pre-feasibility or scoping studies or business case development), and is likely to proceed to formal announcement.   


The project has a firm commitment and timeline from a state, territory or major local government, but has not yet entered the market.

Under procurement

The project or transaction is under procurement (such as a call for Expressions of Interest, requests for tender, or another offer to the market).

Preferred bidder announced

A preferred bidder has been selected and is in exclusive negotiations.

Recently closed

Projects that have progressed to contractual close remain on ANZIP for 12 months.

ANZIP is focused only on major infrastructure activity, above the following thresholds:


Construction projects: > AUD$300m

Investable greenfield & brownfield: > AUD$100m

New Zealand

All greenfield and brownfield projects and divestments: > NZD $100 million

STATUS: Credibly proposed
SECTOR: Energy
TYPE: Greenfield

Project scope

The proposed transmission project aims to support the delivery of a pilot Renewable Energy Zone (REZ ) in New South Wales's 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.

The Australian Energy Market Operator's (AEMO) 2020 Integrated System Plan (ISP) estimates that the Transmission Link 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.



Key Dates

2024-25: Expected delivery of the project




Federal Government: $5 million

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.



Project History

Dec 2020: The Central-West Orana Renewable Energy Zone (REZ) Transmission Project was declared a Critical State Significant Infrastructure by the New South Wales Government.

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.

June 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.


Last reviewed: 03/02/2021

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Government sponsors


Supporting agencies