Since the early 1990s, ESAC has worked with organizations that would become part of the amalgamated Toronto Hydro.  Being the largest energy consuming city in Canada, Toronto requires exceptional monitoring and control to ensure that each individuals energy needs are being met.  ESAC was contracted to design and implement a communication system containing over 300 pole-top RTUs.

Each pole-top RTU is linked via radio communications for interface to a central monitoring station.  When originally developed, Etobicoke Hydro had expressed a need for high reliability so the system was designed in a manner to yield a high degree of fault-tolerance.  Failure of any unit will not cause loss of communication for any other in the field.  This design also allows for easy expansion; necessary due to the increasing energy needs of the Metropolitan Toronto area.

A pre-existing SCADA monitoring station was used in the ESAC design to save the organization the most, while still providing the features needed.