On Wednesday, Australia's High Court threw out Mach Energy Australia Pty.'s challenge over plans to expand the Mount Pleasant operation in New South Wales. A lower court had found that Scope 3 emissions - the pollution released when customers burn the coal - accounted for 98% of the site's potential emissions and had to be properly considered. The dispute reached the High Court after a local community group in the Hunter Valley challenged the expansion.
In the judgment, Justice Robert Beech-Jones said authorities are obliged to determine whether "all GHG emissions, including scope 3 GHG emissions, are minimized to the greatest extent practicable." Three of the five judges endorsed dismissing Mach's appeal.
In July 2025, a New South Wales appeals court found that signing off on a 22-year extension at Mount Pleasant was unlawful, and it directed planning bodies that they must weigh the local consequences of Scope 3 emissions. The High Court's ruling has immediate force for planning approvals in New South Wales, Australia's second-largest coal producer, and advocates contend it is poised to guide comparable decisions across the country. Mach Energy said: "While we are disappointed with the outcome, we accept the court's decision and will carefully review the judgment to understand its implications for future project assessments and environmental approvals." The company also noted Mount Pleasant received a separate six year extension in August.
The Australia Institute counts roughly 30 live applications for new or expanded coal mines awaiting government sign-off. Environmental groups, including Lock the Gate Alliance, applauded the ruling. "This is a momentous win for the climate," said coordinator Nic Clyde, arguing that the costs borne by households and communities from coal pollution must be weighed properly.
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Coal is a major export for Australia, bringing in about A$70 billion ($49 billion). Official projections indicate thermal coal export earnings will be about A$31 billion over the 12 months to June 2027, while shipment volumes slip nearly 3% to 209 million tons. Over the same period, metallurgical coal shipments for steelmaking are expected to climb almost 7% to 161 million tons, worth about A$44 billion. Exports peaked in the year starting July 2022, and the outlook suggests a plateau ahead.
Miners argue Australia's coal is cleaner than some foreign supply and caution that delays in approvals could affect jobs and tarnish the country's standing as a reliable energy partner. Those arguments collide with persistent criticism that Australia supports large coal and gas projects even as it targets steeper domestic emissions cuts and advocates stronger action abroad. The debate is intensifying as the country prepares to helm global climate negotiations at COP31 in Turkey next month.
If planning bodies in New South Wales now demand more robust plans to tackle Scope 3, expect longer timelines and more legal friction across those 30 or so pending projects. Watch whether this approach becomes the template in other states and keep an eye on any export guidance changes that could filter through to producer earnings, government royalties, and local economies tied to the coal supply chain.
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