On 30 September 2019, Ausgrid submitted a proposal to the AER to approve an amendment to its Tariff Structure Statement to include new network tariffs to apply to certain embedded network customers. On 28 February 2020, we released our decision to not approve Ausgrid's proposal to amend its Tariff Structure Statement. As a result of our decision, Ausgrid's current Tariff Structure Statement, released on 30 April 2019, will continue to apply.

On 15 January 2020, we held a workshop for stakeholders who had registered their interest to participate in this process. At the workshop, we outlined our initial assessment of Ausgrid's proposal against the requirements of the National Electricity Rules. Participants were provided with an opportunity to comment on Ausgrid's TSS amendment proposal and our initial assessment. We also accepted feedback from stakeholders through written submissions.

In line with our final decision on Ausgrid's electricity distribution and transmission networks, we have updated Ausgrid's return on debt for 2020-21. As a result of this update, the return on debt for 2020-21 is 5.37 per cent for its distribution and transmission networks. This results in an X-factor for 2020-21 of 2.67 per cent and -16.41 per cent for its distribution and transmission networks respectively. 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 PTRMs show the updated X-factor.

On 16 December 2020, the AER released its decision on a positive cost pass through application received from Ausgrid. The application relates to unanticipated operating and capital expenditure costs incurred by Ausgrid as a consequence of storms that occurred on 26 November 2019, January 2020 and over a number of days (6–9 and 17–18) in February 2020, causing damage to its network.

In line with our final decision on Ausgrid's electricity distribution and transmission networks, we have updated Ausgrid's return on debt for 2021-22. As a result of this update, the return on debt for 2021-22 is 4.94 per cent for its distribution and transmission networks. This results in an X-factor for 2021-22 of 2.45 per cent and -15.14 per cent for its distribution and transmission networks respectively. 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 PTRMs show the updated X-factors.

In line with our final decision on Ausgrid's electricity distribution and transmission networks, we have updated Ausgrid's return on debt for 2022-23. As a result of this update, the return on debt for 2022-23 is 4.62 per cent for its distribution and transmission networks. This results in an X-factor for 2022-23 of 3.69 per cent and -13.56 for its distribution and transmission networks respectively. 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.

In line with our final decision on Ausgrid's electricity distribution and transmission networks, we have updated Ausgrid's return on debt for 2023–24. As a result of this update, the return on debt for 2023–24 is 4.65 per cent. This results in an X-factor for 2023–24 of 12.93 per cent and 4.07 per cent for its distribution and transmission networks respectively. 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.