ADMINISTRATIVE LAW - application for judicial review of decision of the Australian Competition Tribunal (Tribunal) reviewing decision of the Australian Energy Regulator (AER) - nature and scope of review by the Tribunal - whether the Tribunal erred in its construction of provisions of the National Gas Law or National Gas Rules - return on debt - transition between methods of deciding the return on debt - where the AER did not allow revision of the service provider's proposal - whether the Tribunal purported to review a decision of a type that did not fall within its jurisdiction
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