law: Electricity Regulatory Commissions Act, 1998 
  28. Determination of tariff by Central Commission 
  The Central Commission shall determine by regulations the terms
  
  and conditions for fixation of tariff under clauses (a), (b) and (c) of section
  
  13, and in doing so, shall be guided by the following, namely:- 
  (a) the generating companies and transmission entities shall
  
  adopt such principles in order that they may earn an adequate return and at the
  
  same time that they do not exploit their dominant position in the generation,
  
  sale of electricity or in the inter-State transmission of electricity;
  (b) the factors which would encourage efficiency, economical use
  
  of the resources, good performance, optimum investments and other matters which
  
  the Central Commission considers appropriate;
  (c) national power plans formulated by the Central Government;
  
  and
  (d) such financial principles and their applications contained
  
  in Schedule VI to the Electricity (Supply) Act, 1948 as the Commission
  
  considers appropriate.