Vaiko who has already filed a PIL in Madras High Court against the multi-crore project raising safety concerns about dams in the region, said there was need to put pressure on the Union Government not to proceed with the proposal.
Achuthanandan later told reporters that he had promised his support for the cause.
Tamil Nadu and Kerala should together fight against the proposal, he said.
He had recently met Kerala Chief Minister Oommen Chandy on the issue.
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