Mayors' Megawatt Challenge
Since 2003, the Mayors’ Megawatt Challenge has been bringing together leading municipalities to achieve exceptional levels of energy and environmental performance in municipal facilities.

In 2011 the program went national with the Town Hall Challenge, which engaged cities and towns from eight provinces in identifying and recognizing some of the most energy efficient buildings in Canada. This national expansion has broadened the reach and added substantially to the range of benchmarking, best practices and experience with all types of municipal facilities and energy and environmental issues which is shared among the member municipalities.
Making Savings
  Savings 2018
(vs. 2017)
Savings Percent Savings 2018
(vs. 2016)
Savings Percent
Electricity 7,914 MWh 6.2 % 10,679 MWh 8.8 %
Demand 4 MW 1.9 % 8 MW 3.5 %
Thermal (7,128) eMWh (5.5) % (7,415) eMWh (6.1) %
Total energy 787 eMWh 0.3 % 3,264 eMWh 1.3 %
Water 4 10m3 1.1 % 44 10m3 11.7 %
Greenhouse gas emissions (CO2e) (1,018) tonnes (1,021) tonnes
Energy Cost Savings $ 842,062 $ 1,103,572
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, 2018
numbers in ( ) are increases
What's new?
Take the Town Hall Challenge to reach a target of 20 ekWh/sf in your Town/City Hall by 2015.  White paper released in Feb 2013.  For more information, visit
2012 presentations and checklists are online under the documents link.
OPA incentive programs - measures must be pre-approved. Go to for more information
Enbridge and Union offer performance-based incentive program for gas and steam savings.
Total municipalities 13
 Barrie (City of)  Oshawa (City of)
 Brampton (City of)  Peel (Region of)
 Caledon (Town of)  Richmond Hill (Town of)
 Guelph (City of)  Toronto (City of)
 King (Township of)  Town Hall Challenge
 Markham (City of)  TRCA
 Mississauga (City of)
Total buildings 113
Total building area 1,020,329 m2
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