ActewAGL Distribution v Australian Energy Regulator

ActewAGL Distribution sought judicial review of decisions made by the Australian Energy Regulator (AER) regarding the wholesale price of electricity in the Australian Capital Territory. The primary dispute revolved around the AER's authority to alter the averaging period used to determine the nominal risk-free rate of capital after it had been initially specified, and whether an extension of time should be granted for filing the application. The case was heard in the Federal Court of Australia.

The legal issues before the court included whether the AER had the authority to change the averaging period for determining the nominal risk-free rate post the initial specification and if the court should exercise its discretion to grant an extension of time for filing the application. The court also needed to determine whether the application should be dismissed under section 10(2)(b)(ii) of the Administrative Decisions (Judicial Review) Act 1977 (Cth).

The court found that the AER did have the power to vary the averaging period based on regulatory practice and finance theory, and rejected the argument that the specified period was unreasonable. The court held that the AER's decision to maintain the averaging period close to the start of the next regulatory control period was consistent with the capital asset pricing model and economic theory. Additionally, the court dismissed the application for an extension of time, finding that the applicant did not provide sufficient grounds for the extension. Consequently, the court ruled that the application should be dismissed, and ordered that the applicant pay the respondent's costs.