GTA East

Regional electricity planning in the Greater Toronto Area (GTA) East region is divided into two sub-regions – Pickering-Ajax-Whitby and Oshawa-Clarington.

Regional planning activities in GTA East


A Needs Assessment, the first step in the planning process, did not identify any needs in the area requiring regional coordination and integrated planning at this time. The Needs Assessment report is available on Hydro One's regional planning page for the GTA East region.

The first regional planning cycle was completed with the release of an Integrated Regional Resource Plan (IRRP) in June 2016 and Regional Infrastructure Plan in January 2017, specifically for the Pickering-Ajax-Whitby sub-region. Similarly, the Needs Assessment completed at that time did not identify any needs requiring regional coordination for the Oshawa-Clarington sub-region.

Region overview

Map of GTA EastStrong community growth is being seen in many areas across the GTA East region. Plans to accommodate urban intensification and the new "Seaton" community north of Pickering require integrated regional solutions to ensure that the electricity system can continue to supply the demand over the long term.

The GTA East region extends from Lake Ontario northward to the southern parts of Scugog and Uxbridge, and includes the municipalities of Pickering, Ajax, Whitby, Oshawa and parts of Clarington within Durham Region. The area is supplied by several transformer stations fed by the 230 kV transmission system in the area.

The local distribution companies providing service to customers in the area include:

  • Hydro One Distribution
  • Oshawa PUC Networks
  • Elexicon Energy