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Project Overview

Electrification of the UP Express required a connection to Ontario’s electrical system.


It was proposed that the power be supplied from Hydro One’s existing 230 kilovolt (kV) transmission line that runs between our Claireville Transformer Station (located near Highway 407 and Highway 27 in the City of Vaughan) and Richview Transformer Station (located near Highway 401 and Highway 27 in the City of Toronto). A new 230 kV Traction Power Substation (TPS) was required to convert the voltage from 230 kV, to 25 kV so that it can be used to power the electric trains.

We initiated a Class Environmental Assessment, in accordance with the Ontario Environmental Assessment Act for the Traction Power Supply system, and carried out the EA study in accordance with the Class EA for Minor Transmission Facilities. Read the Notice of Commencement.

With Metrolinx, Hydro One held joint Public Open Houses to provide information, answer questions, and obtain feedback about the proposed plan to electrify the Union Pearson (UP) Express route.


Project Approvals

Hydro One issued the draft Environmental Study Report for the Union Pearson (UP) Express TPS project for a 30-day public and agency review and comment period that concluded on April 30, 2014. A Notice of Completion advertisement was also published in local newspapers. Over the review period, one Part II Order request was received by the Minister of the Environment and Climate Change, requesting that the project be subject to an Individual Environmental Assessment (EA).  On February 13, 2015, the Minister ruled that the project does not require an Individual EA.  Read the details of Minister’s decision and conditions.

Hydro One filed our final Environmental Study Report (ESR) with the MOECC on March 13, 2015.


Final ESR

Contact Us

For more information please contact:

 Marylena Stea
Community Relations
Hydro One Networks Inc.

Tel: 416-345-6799 or 1-877-345-6799

Fax: 416-345-6984

Community.Relations@HydroOne.com