Transgrid – Adjustment Proposal Cover Letter – WSB Non-contestable Project – 2026–27 Adjustment – March 2026

On 31 March 2026, we received an annual revenue adjustment proposal from Transgrid relating to the Waratah Super Battery – Network augmentation and SIPS control system (WSB Non-contestable Project). 

On 1 May 2026, Transgrid submitted a revised annual revenue adjustment proposal. This revised proposal excludes the revenue adjustment related to Paired Generation Costs, which was included in Transgrid’s 31 March proposal. We expect this revenue adjustment will instead be included in Transgrid’s annual adjustment proposal in 2027.

Transgrid’s proposal included routine adjustments to replace placeholder financial inputs determined in our final decision with actual financial inputs. It also included a non-routine expenditure adjustment. We will assess Transgrid’s proposal against the requirements in the revenue determination, EII Regulation and the Revenue determination guideline for non-contestable network infrastructure projects (non-contestable Guideline).

Following our assessment, we will determine an updated maximum allowed revenue, quarterly schedule of payments and revenue models for this project. Consistent with our non-contestable Guideline, we will endeavour to complete this process within 42 business days.