Mayors' Megawatt Challenge
Founded in 2003,the Mayors’ Megawatt Challenge brings together municipalities of every size from across North America to lower energy use,emissions, and operating costs in their own facilities, while demonstrating leadership in climate change action within their communities. Members manage data, assess their energy and environmental performance, set targets and track savings over time. They develop and share knowledge and best practices through data-driven research,webinars and networking to help plan, implement and verify improvements.

The Mayors' Megawatt Challenge is a program of the Climate Challenge Network.
Making Savings
  Savings 2021
(vs. 2020)
Savings Percent Savings 2021
(vs. 2019)
Savings Percent
Electricity no data   14,496 MWh 25.4 %
Demand no data   22 MW 25.3 %
Thermal no data   10,742 eMWh 20.6 %
Total energy no data   25,238 eMWh 23.1 %
Water no data   28 10m3 59.6 %
Greenhouse gas emissions (CO2e) no data 2,535 tonnes
Energy Cost Savings no data $ 2,341,055
Not all participant buildings are reporting in all years or in all categories. Savings are reported on a net basis.
Results as of December 31, 2021
numbers in ( ) are increases
What's new?
Total municipalities 17
 Barrie (City of)  Richmond Hill (City of)
 Brampton (City of)  Toronto (City of)
 Caledon (Town of)  Town Hall Challenge
 King (Township of)  Town of Halton Hills
 Markham (City of)  Township of Bonnechere Valley
 Mississauga (City of)  TRCA
 Oakville (Town of)  Vaughan (City of)
 Peel (Region of)  Whitby (Town of)
 Prince Albert SK (City of)
Total buildings 95
Total building area 1,073,750 m2
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