Managing safety and environment risks on Line 3W

Market National Electricity Market
StageProject Specification Consultation Report
ConvenorAEMO NSP
Accepting submissions?No
Submissions close21/01/2020

TransGrid has recently published a Project Specification Consultation Report for managing safety and environmental risks on Line 3W (Kangaroo Valley to Capital Wind Farm). 

Constructed in 1972, the 130 km single circuit 330 kV transmission line is comprised of 296 steel tower structures between Capital Wind Farm and Kangaroo Valley 330 kV switching stations. Line 3W forms a key link between Canberra and Wollongong and enables the transmission of electricity from generators in the area including Capital Wind Farm, Woodlawn Wind Farm, Kangaroo Valley Pumping and Power Station, and Bundeela Pumping and Power Station to the NEM. 

A significant proportion of the steel transmission structures of Line 3W are impacted by various levels of deterioration and corrosion. The affected components include tower steelwork, foundations and earthing, insulators, conductor fittings, earthwire and associated fittings. This greatly increases the likelihood of transmission structure failures, conductor drop, and subsequent bushfire and safety risks. 

TransGrid considered three credible options that would meet the identified need from a technological and project delivery perspective. Refurbishment of the line is the most economical and preferred option at this stage of the RIT-T process.

The estimated capital cost of the proposed preferred option is $14.5 million ± 25%.

In accordance with the requirements of the Rules, a summary of the Project Specification Consultation Report is made available on the AEMO website.

A copy of the Project Specification Consultation Report can be obtained from TransGrid on the Regulatory Investments Test page or by emailing

Submissions in response to this Project Specification Consultation Report are required by the closing date of 21 January 2020.

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