Addition of a Permanent Generator - Lester B. Pearson Building

This project is intended to provide a permanent tenant generator that will provide the backup power for all tenant operations for the foreseeable future. With the implementation of the Lester B. Pearson Rehabilitation project underway, they are a number of newly renovated client spaces looking to add to the existing tenant generator distribution system. The proposed permanent generator would provide extra capacity as well as flexibility, when accommodating back up power connections for other projects, as the existing back up power distribution system does not appear to be easily shut down in order to allow new connections. Additionally, this project is looking to add its own fuel distribution system to supply only the tenant owned generator. This will achieved by disconnecting from the existing 10,000L fuel bunker and removal of the existing day tank. A new pad mounted external fuel tank with spill containment devices will be added exterior to the building. The existing 10,000L fuel bunker will carry on supplying the base building/life safety generators until their replacement is complete.


A feasibility study was done to determine the optimal size, location and system architecture of the new tenant generator and power distribution system. The recommended option of a 2.5MW exterior pad mounted and weathertight enclosed unit with external pad mounted fuel storage was selected. This will allow the removal of the existing tenant generator from the generator room permitting additional space for new distribution equipment to be installed in a code compliant manner.


Latest update

June 24, 2024 – The public comment period on the project is closed. The authorities are considering comments received to help inform the determination on whether the carrying out of the project is likely to cause significant adverse environmental effects.


Key documents

Key documents
Document Number Document Title File Date
1 Addition of a Permanent Generator - Lester B. Pearson Building - May 24, 2024


Environment, Health and Safety
Public Services and Procurement Canada
11 Laurier Street
Portage III, Place du Portage
Gatineau, Quebec K1A 0S5

  • Location

    • Lester B. Pearson Site (Ontario)
  • Nature of Activity

    • Other, not otherwise specified
  • Assessment Status

    In progress
  • Start Date

  • Proponent

  • Authorities

    • National Capital Commission
    • Public Services and Procurement Canada
  • Assessment Type

    Project on federal lands
  • Reference Number


This map is for illustrative purposes. The markers represent the approximate locations based on available data. More than one marker may be identified for a given assessment.


Nearby assessments

...within 200 kilometres
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