TransGrid PACR: Managing asset risks at Forbes substation

Market Network Service Provider
StageProject Assessment Conclusions Report
ConvenorAEMO NSP
Accepting submissions?No

TransGrid has recently published a Project Assessment Conclusions Report (PACR) for managing asset risks caused by the deteriorating condition of transformers at Forbes substation. 

There are two transformers are Forbes substation (No.1 Transformer and No.2 Transformer), which are used to change the voltages levels. Different voltages are used for generation, high voltage transmission and local distribution. 

Forbes 132/66 kV substation is located on TransGrid’s Central NSW network. The substation connects the Essential Energy distribution network and supports approximately 200 MW of existing renewable generation in the area. 

The transformers at Forbes substation are essential for the safe and reliable transmission of electricity to the Central NSW network. If the deteriorating asset condition at Forbes substation is not addressed by a technically and commercially feasible credible option in sufficient time (by 2022/23), the likelihood of prolonged and involuntary load shedding in the Central West will increase.

In addition to the market benefit of avoided prolonged and frequent involuntary load shedding, the proposed investment will also assist TransGrid to manage and mitigate safety risks that would otherwise arise from continued deterioration of asset condition. Rectifying the worsening condition of the transformers will reduce safety risks, as well as lower planned and unplanned corrective maintenance costs. However, these costs are of small magnitude compared to the cost of prolonged and frequent involuntary load shedding and do not affect the preference amongst the options.

TransGrid published a Project Specification Consultation Report (PSCR) for managing asset risks at Forbes substation in August 2020. No submissions were received in response to the PSCR during the consultation period which closed in November 2020.

TransGrid put forward for consideration two credible options that would meet the identified need from a technical, commercial, and project delivery perspective. Option 1 (replacing No.1 and No.2 transformers with new 132/66 kV 60 MVA transformers) remains the preferred option at this stage of the RIT-T process. This option is estimated to have a capital cost of $9.1 million +/- 25% and is expected to be completed by 2022/23. TransGrid is the proponent of the proposed network project.

In accordance with the requirements of the National Electricity Rules, a summary of the PACR is made available on the AEMO website. A copy of the PACR can be obtained from TransGrid’s website or by emailing

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