TNPCB contended that Sterlite's plea is not maintainable in the Tribunal (NGT) as the company had bypassed the appellate authority set up under the statute to hear the appeals.
Countering the contention, Sterlite said as there was no functional appellate authority in existence when TNPCB's order was passed, it was justified in directly moving to the NGT.
The group company of UK-based Vedanta Resources also urged the NGT to decide the issue of maintainability of its appeal and also whether the TNPCB's May 30 order for closure of the copper plant be upheld or not as their unit is incurring a loss of Rs 50 crore per day.
The bench will hear further arguments on May 16.
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During the proceedings, senior advocate C A Sundaram, appearing for Sterlite, argued that its appeal is maintainable as when the plant was ordered to cease operations, there was no functional appellate authority in existence and challenges to TNPCB's orders were being heard by the NGT's Chennai bench.
He said the appellate authority was non-functional as it had only a single member on its bench as against the requisite strength of three members.