In line with our final decision on TransGrid's electricity transmission network, we have updated TransGrid's return on debt for 2019-20 under NER cl. 6A.6.2(l). As a result of this update, the return on debt for 2019-20 is 5.77 per cent. This results in an X-factor for 2019-20 of –0.97 per cent. Holding other things constant, a positive X-factor implies a real revenue decrease and a negative X-factor implies a real revenue increase. The revised post-tax revenue model (PTRM) shows the updated X-factor.

In line with our final decision on TransGrid's electricity transmission network, we have updated TransGrid's return on debt for 2020-21. As a result of this update, the return on debt for 2020-21 is 5.41 per cent. This results in an X-factor for 2020-21 of -0.17 per cent. Holding other things constant, a positive X-factor implies a real revenue decrease and a negative X-factor implies a real revenue increase. The revised PTRM shows the updated X-factor.

On 28 April 2020, the AER published its final decision on TransGrid's contingent project application for the QNI minor upgrade project. The revised PTRM shows the updated revenues.

In line with our final decision on TransGrid's electricity transmission network, we have updated TransGrid's return on debt for 2021-22. As a result of this update, the return on debt for 2021-22 is 4.96 per cent. This results in an X-factor for 2021-22 of -1.32 per cent. Holding other things constant, a positive X-factor implies a real revenue decrease and a negative X-factor implies a real revenue increase. The revised PTRM shows the updated X-factor.

On 31 May 2021, the AER published its final decision on TransGrid’s contingent project application for the South Australia to New South Wales interconnector, Project EnergyConnect. The revised PTRM shows the updated revenues. We have also amended the relevant inputs in TransGrid's PTRM to include the recently approved VNI Minor contingent project expenditure.

In line with our final decision on TransGrid's electricity transmission network, we have updated TransGrid's return on debt for 2022-23. As a result of this update, the return on debt for 2022-23 is 4.66 per cent. This results in an X-factor for 2022-23 of -8.30 per cent. Holding other things constant, a positive X-factor implies a real revenue decrease and a negative X-factor implies a real revenue increase. The revised PTRM shows the updated X-factor.

On 17 August 2022, the AER published its final decision on Transgrid’s contingent project application for the costs of early works associated with the staged delivery of HumeLink. The costs associated with the HumeLink contingent project span across two regulatory control periods, 2018–23 and 2023–28. The revised PTRM for 2018–23 containing a portion of the updated revenues from this decision, alongside indicative models for the 2023–28 period, are published on the HumeLink project page.