Re Telstra Corporation Ltd (No 3)

In the case of Telstra Corporation Ltd (No 3), the Australian Competition and Consumer Commission (ACCC) and Telstra Corporation Limited contested the determination of the Wholesale Access Charge (WAC) for the Unconditioned Local Loop Service (ULLS). The dispute was brought before the Australian Competition Tribunal (the Tribunal). The primary legal issue before the Tribunal was whether the ACCC's estimate of the Weighted Average Cost of Capital (WACC) for Telstra was accurate and whether any adjustments made to account for estimation errors were justified. Specifically, the Tribunal had to consider whether Telstra's proposed method of adding an arbitrary amount to the WACC estimate to account for potential asymmetric errors was reasonable.

The Tribunal examined the evidence provided by Professor Bowman, who had estimated the WACC for Telstra. While acknowledging Professor Bowman's extensive experience, the Tribunal concluded that his estimate lacked the necessary statistical and empirical justification to support the addition of an arbitrary error margin to the WACC. The Tribunal held that any adjustments to the WACC estimate should be based on a robust and statistically defensible process, rather than an arbitrary figure. Consequently, the Tribunal found that the method proposed by Telstra was not reasonable, as it did not sufficiently account for the inherent estimation errors in the WACC calculation.

The Tribunal ultimately determined that the ACCC's WACC estimate, without the arbitrary adjustment proposed by Telstra, was a reasonable basis for calculating the WAC for the ULLS. This conclusion was based on the lack of compelling evidence to support the inclusion of an additional error margin. The Tribunal's decision was grounded in the need for a commercially and statistically sound approach to estimating the WACC, which Telstra's method failed to provide.