HumeLink

Reinforcing the New South Wales Southern Shared Network to increase transfer capacity to the state's demand centres (Humelink) 

TransGrid has published a Regulatory Investment Test for Transmission (RIT-T) Project Specification Consultation Report (PSCR) for reinforcing the New South Wales Southern Shared Network to increase transfer capacity to the state's demand centres. 

The Southern Shared Network includes existing transmission capacity and planned interconnectors, connections to the existing Snowy Hydro Scheme and other regional generation assets. It provides transfer capacity to demand centres and allows for interstate and regional transfers.

The shared transmission network between the Snowy Mountains and Bannaby carries power from all generation across southern NSW to the major load centres of Sydney, Newcastle and Wollongong. It also carries all electricity that is imported from Victoria to the major load centres in NSW. The main transmission lines in this area are heavily congested at times of high demand, and will become more congested as new generation connects in southern NSW.

Snowy Hydro's existing generation capacity connects to the Southern Shared Network at Upper Tumut, Lower Tumut, and Murray. Existing congestion at times of high demand limits access to the existing generation capacity of the Snowy Mountains Scheme at times of peak demand. Access to the additional 2000 MW capacity of Snowy 2.0 and other new generation in southern NSW would, therefore, be severely limited, without reinforcement to the Southern Shared Network.

The PSCR details the need to reinforce the New South Wales Southern Shared Network to increase capacity to the state's demand centres and describes credible options to meet the need, including technical characteristics that would be required of a non-network option.

Reinforcing the New South Wales Southern Shared Network to increase transfer capacity to the state's demand centres Project Specification Consultation Report (PSCR)

Inputs and Methodology Consultation Paper - Reinforcing the New South Wales Southern Shared Network to increase transfer capacity to the state's demand centres

Inputs and Methodology Assumptions Workbook - Reinforcing the New South Wales Southern Shared Network to increase transfer capacity to the state's demand centres

The consultation process

In order to assess all network and non-network solution options from a technical and economic perspective, we are using the Australian Energy Regulator's Regulatory Investment Test for Transmission (RIT-T). The RIT-T is a formal consultation process designed to:

  • Inform stakeholders of investment need and proposed options to address it
  • Test the market for alternative and more efficient solutions
  • Explain to stakeholders the basis on which the preferred option has been selected. 

The RIT-T consultation process has three stages:


We are now at the first stage of the process, having published the Project Specification Consultation Report (PSCR). The second stage will involve a full quantitative analysis of the proposed options and expected market benefit across a range of scenarios and sensitivities. This will be reported in the Project Assessment Draft Report (PADR).

Submissions and next steps

TransGrid received the following written submissions on the PSCR: 
TransGrid is currently considering the issues raised in these submissions and is developing a PADR to be published as soon as the analysis of submissions is complete.