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 13,968 MWh 18.5 % 18,666 MWh 21.2 %
Demand 15 MW 14.7 % 24 MW 16.2 %
Thermal 16,194 eMWh 17.5 % 10,307 eMWh 10.7 %
Total energy 30,162 eMWh 17.9 % 28,973 eMWh 15.7 %
Water 5 10m3 20.0 % 4 10m3 20.5 %
Greenhouse gas emissions (CO2e) 3,446 tonnes 2,398 tonnes
Energy Cost Savings $ 2,452,457 $ 2,838,513
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 1,036,852 m2
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