The High Court dismissed MACH Energy’s appeal over the Mount Pleasant expansion on 7 October. The dispute concerned how downstream emissions were considered in the approval process. It was a setback for the expansion, not an order to close the existing mine. ABC’s account of the judgment explains the distinction.
NSW’s statement says a separate approval permits operations until 2032, the expansion can be reconsidered, and extensions remain possible. Those qualifications matter before anyone declares Australian coal finished.
What Australia could lose
We would want Australian policymakers to establish what replaces an export business before restricting it. Overseas customers could continue seeking the same fuel after Australia reduces production. If another exporter supplies it, Australia could lose income and investment while achieving less climate benefit than advertised.
We think this is the strongest economic argument against restricting supply. We cannot measure that outcome from this judgment alone. We cannot say that every withheld Mount Pleasant tonne will be replaced, that replacement coal will have higher emissions, or that the decision has already cost a particular number of jobs. The sources here do not establish those claims.
Our concern is the investment signal. Would you finance a long-life project if you could not price the approval path? A proponent could struggle to finance a project even if it eventually secures permission. We would prefer a clear assessment process that tests both economic and environmental consequences.
The strongest counterargument
The residents’ case was that emissions from combustion overseas can cause harm locally and must be considered. ABC reports that the majority required consideration of conditions to minimise greenhouse emissions, including Scope 3. NSW also points to the Hunter Valley Operations approval as evidence that its planning framework can consider those emissions. That is the government’s position.
We think proponents should meet that standard. An economic advantage does not excuse an incomplete assessment. Equally, acknowledging climate harm should start the calculation, not end the discussion about substitution, energy security and regional livelihoods.
What a credible replacement test would ask
Our proposed test has three parts: what buyers would do without the extra coal; which alternative suppliers could deliver comparable fuel, when and at what cost; and how emissions differ between continued production, replacement supply and reduced consumption. It should also test lower demand and faster technology substitution, rather than choosing the assumptions that rescue the project.
Until those questions are answered, “the world will fill the void” is a plausible thesis, not a sourced certainty. “The emissions disappear with the approval” is no safer an assumption.
The Take: Australian policymakers should test how customers and competing exporters would respond to restricted supply. Proponents also need to address downstream emissions properly. We would judge the decision against both tests.
Opinion and analysis, as of 9 October 2026.
Style update, 11 October 2026: wording revised; sourced figures, publication date and substantive qualifications retained.