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 2020
(vs. 2019)
Savings Percent Savings 2020
(vs. 2018)
Savings Percent
Electricity 15,629 MWh 18.8 % 20,042 MWh 20.9 %
Demand 20 MW 15.9 % 27 MW 16.0 %
Thermal 15,998 eMWh 15.5 % 11,575 eMWh 10.3 %
Total energy 31,627 eMWh 17.0 % 31,617 eMWh 15.1 %
Water 46 10m3 40.7 % 38 10m3 39.3 %
Greenhouse gas emissions (CO2e) 3,465 tonnes 2,679 tonnes
Energy Cost Savings $ 2,678,421 $ 3,067,868
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, 2020
numbers in ( ) are increases
What's new?
Total municipalities 15
 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)  TRCA
 Mississauga (City of)  Vaughan (City of)
 Oakville (City of)  Whitby (Town of)
 Peel (Region of)
Total buildings 91
Total building area 1,057,172 m2
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