CSIRO faces scrutiny over transparency on Darwin LNG methane leak
Australia's national science agency is facing criticism over its handling of a major methane leak linked to Santos's Darwin LNG plant. Internal emails and messages released under freedom of information laws show staff were concerned about public scrutiny after reporting on the leak intensified. The material relates to a design fault in the Darwin LNG tank that allowed methane to escape for years before the issue became public.
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The newly released correspondence shows CSIRO staff discussing how to respond to questions about the agency's role and how to manage the fallout from the reporting. According to the documents, some staff described the situation as "difficult and tricky" with the minister, and discussed whether replies should be more "fulsome". The messages also show the agency stressing that it did not directly monitor the leak, while internally acknowledging that its contract with Santos allowed for direct monitoring.
The leak itself has been described as a secret 18-year release from the Darwin LNG plant, with the scale of the carbon pollution compared with adding 8,300 new cars to the road each year. The plant is about to be filled again, according to the material. That detail has sharpened concern among environmental groups and public-interest advocates about whether the leak was properly disclosed and how quickly the risks were understood.
The case matters because it sits at the intersection of energy production, environmental oversight and public trust in scientific institutions. CSIRO is Australia's national science agency, and its work is often relied on by government and industry in technical disputes. When a public body is seen as cautious about disclosure, the issue can extend beyond one leak and into broader questions about transparency in the regulation of fossil fuel infrastructure.
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The documents were released to the Environment Centre NT, which has argued that the agency has been reluctant to be transparent with the public. Bree Ahrens, the group's acting executive director, said the material suggested an ongoing and unacceptable reluctance by CSIRO to be open. Former New South Wales Supreme Court judge Anthony Whealy also said there was a distinct impression that CSIRO had not been entirely frank about its dealings in the matter.
The reporting also points to a longer timeline. CSIRO was engaged by Santos for a range of services in 2021 and 2024, including advice on methods used to monitor emissions at the Darwin site. The ABC first revealed in September 2025 that the LNG storage tank at Santos's Darwin facility had been leaking, and said government agencies had known about it.
The latest FOI material adds a new layer by showing how the agency internally discussed the scrutiny that followed. For Santos, the issue remains tied to the operational history of a major LNG facility in northern Australia. For CSIRO, the concern is reputational as well as procedural, because the agency's role in emissions monitoring is now being examined alongside its public communications.
The episode also raises wider questions about how much information should be disclosed when industrial emissions are discovered after long delays. What remains unclear is the full extent of CSIRO's involvement in the leak investigation, how much was known by government agencies before the issue became public, and what further documents may show about the decision-making process. It is also not yet clear what additional steps, if any, will be taken to address the leak's environmental impact or the transparency concerns now surrounding it.
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The next developments are likely to focus on further disclosure, official responses and whether the agency's role is reviewed more closely.
