A legal contention emerged between APTRANSCO and GMR Vemagiri Power Generation Ltd. regarding the definition of "fuel" within their Power Purchase Agreement, specifically whether it encompassed solely natural gas or ... also included Regasified Liquefied Natural Gas (RLNG), with the Andhra Pradesh Electricity Regulatory Commission initially interpreting "fuel" as natural gas in its unrefined state, a ruling subsequently overturned by the Appellate Tribunal, leading to an appeal before the Supreme Court.