Australia's High Court rejected MACH Energy's appeal over the Mount Pleasant coal expansion.
Why it matters: The majority said NSW planners had to consider whether conditions could reduce emissions from burning exported coal. The ruling does not automatically block fossil-fuel projects, but it changes what comparable planning decisions must address.
- The High Court dismissed MACH Energy Australia's appeal on October 7, 2026.
- A majority found the Independent Planning Commission failed to consider conditions that could minimize greenhouse-gas emissions to the greatest extent practicable.
- Scope 3 emissions - indirect emissions from activities such as burning exported coal - represented 98% of the project's predicted greenhouse-gas emissions.
- The mine has a separate approval to operate through the end of 2032.
Australia's High Court has dismissed MACH Energy Australia's appeal over the proposed expansion of the Mount Pleasant coal mine in New South Wales.
The case involved a 2022 approval from the Independent Planning Commission to extend the mine's operating life by 22 years, to December 2048, and substantially increase production. The High Court judgment summary says the court ruled unanimously that the Commission complied with its obligation to consider likely environmental impacts in the locality.
But by majority, the court found the Commission failed to consider whether it should impose conditions to minimize greenhouse-gas emissions to the greatest extent practicable, including Scope 3 emissions. Scope 3 emissions are indirect emissions generated elsewhere in a project's value chain, such as emissions from burning exported coal. They represented 98% of the project's predicted greenhouse-gas emissions.
The decision leaves in place the New South Wales Court of Appeal's July 2025 ruling, which invalidated the expansion approval for failing to consider a mandatory matter.
The proposed project involved extracting about 444 million tonnes of coal, with more than 870 million tonnes of carbon-dioxide-equivalent emissions expected from burning the exported coal, according to ABC News.
The ruling does not mean every fossil-fuel approval is invalid or that every project must be rejected. Instead, NSW decision-makers assessing comparable proposals must consider the relevant statutory obligations, including whether conditions could minimize the project's greenhouse-gas emissions to the greatest extent practicable. The result will depend on each proposal's facts, the applicable statutory provisions and the decision-making process.
As an implication of the ruling, future approvals could require more analysis of downstream emissions and create additional grounds for legal challenge. The ruling could also affect how investors assess approval timelines and legal risk, but those are potential consequences, not findings established by the court.
The NSW government said the mine has a separate approval through 2032, according to ABC News. The ruling does not change that approval. Any operations beyond that date would require a valid approval under the applicable NSW planning framework.
By the numbers
- 98% - Share of predicted project emissions attributed to Scope 3 emissions
- 444 million tonnes - Coal the proposed expansion would extract
- 870 million tonnes - Carbon-dioxide-equivalent emissions expected from burning the exported coal
Yes, but: The decision concerns judicial review of the approval process, not whether the mine should operate. It also does not automatically invalidate other fossil-fuel approvals.
What's next: The mine's separate approval runs through the end of 2032. Operations beyond that date would require a valid replacement approval.