law: The Petroleum and Natural Gas Regulatory Board Act, 2006
  16. Authorisation.-
  No entity shall-
  a.  
  
    lay,
  
  build, operate or expand any pipeline as a common carrier or contract carrier,
  b.  
  
    lay,
  
  build, operate or expand any city or local natural gas distribution network,
  
  without obtaining authorisation under this Act: Provided that an entity,-
   
  
   i.  
  
    laying,
  
  building, operating or expanding any pipeline as common carrier or contract
  
  carrier; or
   
  
   ii.  
  
    laying,
  
  building, operating or expanding any city or local natural gas distribution
  
  network, immediately before the appointed day shall be deemed to have such
  
  authorisation subject to the provisions of this Chapter, but any change in the
  
  purpose or usage shall require separate authorisation granted by the Board.