Mobil Oil Australia Pty Ltd v Victoria

Mobil Oil Australia Pty Ltd ("Mobil") sought a declaration from the High Court of Australia that section 13 of the Courts and Tribunals Legislation (Miscellaneous Amendments) Act 2000 (Vic) was invalid. This section inserted Part 4A into the Supreme Court Act 1986 (Vic), which provided for the commencement and conduct of "group proceedings" in the Supreme Court of Victoria. Mobil's challenge arose in the context of a group proceeding commenced by Tasfast Air Freight Pty Ltd (formerly Schutt Flying Academy (Australia) Pty Ltd) against Mobil, alleging breaches of contract and negligence in relation to the manufacture and supply of aviation fuel.

The High Court was required to determine several significant legal issues. Firstly, it had to consider whether the Victorian Parliament possessed the legislative power to enact a law providing for group proceedings that could bind unaware claimants in other Australian States, and whether such a law offended the territorial limitations of State legislative power. Secondly, the Court was tasked with examining whether the operation of these State group proceedings involved an impermissible exercise of the judicial power of the Commonwealth, specifically whether a judgment in such a proceeding constituted a "judgment, decree, order or sentence" within the meaning of section 73 of the Constitution, and if the proceedings were otherwise incompatible with Chapter III of the Constitution.

The Court's reasoning focused on the constitutional division of powers between the Commonwealth and the States. It held that a State's legislative power must be consistent with the legislative powers of other States and the Commonwealth. The Court found that the impugned provisions of the Victorian Act, which purported to regulate proceedings involving parties and circumstances extending beyond Victoria, exceeded the territorial limits of the Victorian Parliament's legislative authority. The Court concluded that the State legislation, in its attempt to bind individuals and claims originating outside Victoria, encroached upon the legislative powers of other States and potentially the Commonwealth, and was therefore invalid.

Consequently, each of the demurrers to Mobil's amended statement of claim was allowed with costs.