law: Electricity Act, 2003 
  41. Other business of
  
  transmission licensee.-
  A transmission
  
  licensee may, with prior initimation to the Appropriate Commission, engage in
  
  any business for optimum utilisation of its assets:
  Provided that a
  
  proportion of the revenues derived from such business shall, as may be
  
  specified by the Appropriate Commission, be utilised for reducing its charges
  
  for transmission and wheeling:
  Provided further that
  
  the transmission licensee shall maintain separate accounts for each such
  
  business undertaking to ensure that transmission business neither subsidises in
  
  any way such business undertaking nor encumbers its transmission assets in any
  
  way to support such business:
  Provided also that no
  
  transmission licensee shall enter into any contract or otherwise engage in the
  
  business of trading in electricity.