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WWF is challenging cities to do more than turn out their lights for Earth Hour.

The Earth Hour City Challenge is a year-long competition among cities to promote renewable energy and prepare for climate change. U.S. cities that participate are recognized for their efforts in spreading the global movement to create more sustainable, resilient cities and compete for the title of U.S. Earth Hour Capital as well as grants from WWF.

Forward-thinking cities are transitioning toward 100 percent renewable energy and addressing local climate threats by implementing practical measures that improve air quality, protect water supplies and reduce urban flooding. With your help, your community can take action too.

City Officials

The Earth Hour City Challenge recognizes cities for adopting renewable energy and preparing for climate-related severe weather. Joining is easy and participating cities will have a chance to be crowned the Earth Hour Capital.

Learn more about how your city can be involved

Who is Participating?


Success Stories

  • Chicago Skyline

    Chicago: 2014 US Earth Hour Capital

    Chicago has moved aggressively to build resilience to climate-related threats. A deadly heat wave in 1995 foretold the danger of a warming planet in which cities are increasingly vulnerable. The 2008 Chicago Climate Action Plan set a standard for city ambition. Chicago is also transitioning from dirty fuels to renewable energy. The city removed coal from the power mix for over 900,000 residents, closed the last two coal plants in the city, and is making it easier and cheaper than ever for businesses and homes to go solar.

  • boulder EHCC winner

    Boulder: 2014 Finalist US Earth Hour Capital

    The City of Boulder made a strong showing in its first year participating in the City Challenge, bringing a legacy of climate leadership and recent accomplishments in both community resilience and renewable energy. A devastating combination wildfire and historic flooding impacted Boulder in 2013. The city’s efforts at implementing strategies to manage such events were validated and reinvigorated. With the community’s support Boulder also moved to own and manage its electricity infrastructure with the aim of reaching ambitious renewable energy targets.

  • cleveland EHCC

    Cleveland: 2014 Finalist Earth Hour Capital

    In 2013 Cleveland was awarded a grant from WWF that supported its 5th annual sustainability summit. The event brought together over 500 Clevelanders to celebrate the city’s year of “Advanced and Renewable Energy”. That same year, Cleveland implemented a community choice aggregation program which allowed it to provide 100% renewable electricity to over 60,000 residents. Cleveland has big plans for 2014, focused on the adoption of strategies to achieve Zero Waste.