Aurizon Network Pty Ltd v Glencore Coal Queensland Pty Ltd

Aurizon Network Pty Ltd initiated proceedings against Glencore Coal Queensland Pty Ltd, contesting the validity of notices provided by the latter under clause 6.1(c) of the Wiggins Island Project Deed (2011). The dispute centred on whether these notices were effective in altering the defendants' liability for the WIRP Fee and shifting the burden onto other Segment Customers. Glencore argued that the notices were valid and that no ambiguity existed in the contract's terms. The court needed to determine the admissibility of extrinsic evidence to interpret the contract and whether the notices conformed to the contractual obligations.

The legal issues in this case revolved around the construction and interpretation of contractual terms, particularly the admissibility of extrinsic evidence to resolve ambiguities or ascertain the meaning of the contract. The defendants argued that an ambiguity must be identified before extrinsic evidence can be considered, while the plaintiff contended that the ordinary meaning of the text should be the starting point and that extrinsic evidence could be admitted to avoid commercial absurdity or to imply terms that were not explicitly stated in the contract. The court had to decide whether the traditional view requiring an ambiguity before admitting extrinsic evidence still held or if the modern approach, which allows for more flexible interpretation, was applicable.

The court found that the traditional view, which strictly required an ambiguity before admitting extrinsic evidence, was not historically accurate. It adopted a more flexible approach, allowing for the consideration of extrinsic evidence even when the text's ordinary meaning appeared clear. The court determined that the notices issued by Glencore were invalid because they had the effect of reducing their liability to zero and shifting the burden onto other customers, which was not consistent with the contract's purpose and object. Additionally, the court found that an implied term of good faith in giving such notices existed, further supporting the invalidity of the notices.

The court ordered that the notices issued by Glencore under clause 6.1(c) of the WIRP Deed were invalid and had no operative contractual effect. The defendants' counterclaims were dismissed, and the parties were directed to submit written arguments on the question of costs within 21 days.