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The NSW government has given planning approval for the multibillion-dollar Snowy 2.0 pumped hydro project, prompting warnings the move will cause the extinction of a rare native fish species.

Mark Lintermans, an associate professor at the University of Canberra, resigned as chairman of the NSW Fisheries Scientific Committee, saying the giant project would likely transfer invasive fish into the final 3 kilometre stretch that plays host to the critically endangered stocky galaxias. As part of the approval, the government granted Snowy Hydro an exemption from two critical provisions of the NSW Biosecurity Act that was designed to prevent the transfer of invasive species, Professor Lintermans said.

“I cannot continue to serve a government that so wilfully ignores the destructive impacts of Snowy 2.0 on two threatened fish species,” Professor Lintermans said in a statement. The invasive climbing galaxias and redfin perch would also have a significant effect on the endangered Macquarie perch.

Planning and Public Spaces Minister Rob Stokes said “In March we approved the Snowy 2.0 Segment Factory and this month we have approved the Snowy 2.0 Main Works, enabling the creation of new jobs and the flow of substantial investment into our state,” Mr Stokes said.

The project's owner, Snowy Hydro, would be required to invest almost $100 million for biodiversity and environmental offsets to protect the values of the Kosciuszko National Park, he said.

When completed, the scheme will involve the construction of a 27-km tunnel to pump water from Talbingo Reservoir to the Tantangara dam, with electricity generated by releases from the upper reservoir. The government touted the benefits of the new project, which it said would create as many as 2,000 new jobs and inject $4.6 billion into regional NSW.

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