Pilbara Infrastructure Pty Ltd v Australian Competition Tribunal

The High Court of Australia heard appeals from the Full Court of the Federal Court of Australia concerning decisions made by the Australian Competition Tribunal. The dispute centred on the Minister's decision to declare services relating to railway lines in the Pilbara region under section 44F of the *Trade Practices Act 1974* (Cth). Pilbara Infrastructure Pty Ltd was one of the parties involved in these proceedings.

The legal issues before the High Court included the proper construction of section 44H(4) of the Act, specifically whether criterion (b), which requires the Minister to be satisfied that it would be "uneconomical for anyone to develop another facility to provide the service," imposes a test of private profitability. The Court also considered the scope of the "public interest" criterion under section 44H(4)(f), determining whether it necessitates or permits an inquiry into the likely net balance of social costs and benefits. Finally, the Court examined whether any residual discretion remained for the Minister after being satisfied of the six specified matters in section 44H(4).

The High Court reasoned that the Tribunal had erred in its interpretation of criterion (b) by adopting a broad social cost-benefit analysis rather than focusing on whether it would be economically feasible for another party to develop a competing facility. The Court held that criterion (b) was intended to identify facilities with natural monopoly characteristics, where a single facility can meet demand more efficiently than multiple facilities, and that the inquiry should be directed to the economic viability of developing an alternative, not a general social welfare assessment. The Court also found that the Tribunal's approach to the public interest criterion was too wide.

In the primary matters, the High Court allowed the appeals, set aside the orders of the Full Court of the Federal Court, and quashed the Australian Competition Tribunal's determination. The matters were remitted to the Tribunal for determination according to law, with each party bearing their own costs. In other related matters, applications for special leave to appeal were dismissed with no order as to costs.