law: Electricity Act, 2003 
  25. Inter-State,
  
  regional and inter-regional transmission.- 
  For the purposes of
  
  this Part, the Central Government may, make region-wise demarcation of the
  
  country, and, from time-to-time, make such modifications therein as it may
  
  consider necessary for the efficient, economical and integrated transmission
  
  and supply of electricity, and in particular to facilitate voluntary
  
  inter-connections and coordination of facilities for the inter-State, regional
  
  and inter-regional generation and transmission of electricity.