IESO Zonal Map

  • The Ontario transmission system has been divided into ten electrical zones as illustrated on this map.

    Zonal boundaries have been chosen to correspond with the major interfaces.
  • Search by Address/Postal Code
  • This map is to be used in support of the IESO's Demand Response Programs. All boundaries are approximate.

Please contact IESO Customer Relations by email or by telephone at 905.403.6900.