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   18,021 MWh 23.9 %
Demand no data   26 MW 23.4 %
Thermal no data   11,152 eMWh 15.9 %
Total energy no data   29,173 eMWh 20.0 %
Water no data   38 10m3 62.2 %
Greenhouse gas emissions (CO2e) no data 2,792 tonnes
Energy Cost Savings no data $ 2,846,493
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 20
 Barrie (City of)  Prince Albert SK (City of)
 Brampton (City of)  Richmond Hill (City of)
 Caledon (Town of)  Toronto (City of)
 Essex County (Town of)  Town Hall Challenge
 King (Township of)  Town of Halton Hills
 La Broquerie (in Manitoba)  Township of Bonnechere Valley
 Markham (City of)  TRCA
 Mississauga (City of)  Vaughan (City of)
 Oakville (Town of)  Village of Westport
 Peel (Region of)  Whitby (Town of)
Total buildings 106
Total building area 1,113,875 m2
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