Environmentalists warn a longer operating life for coal power stations could threaten climate goals. Photo: Dan Peled/AAP PHOTOS

The head of a top climate agency is casting doubt over the extended operating life of Queensland coal power stations, suggesting they are already struggling to stay online.

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Climate Change Authority chair Matt Kean is unconvinced by the Queensland government's decision to keep the state-owned Callide power station open longer.

"The idea that you can extend Callide - which, don't forget, was out for the last couple of years because it didn't work - the idea

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