Energy Conservation Week in Ontario, Canada
Energy Conservation Week in Ontario, Canada is held on May 18. It is about the power of collective action. This event in the second decade of the month May is annual. 
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With Ontario continuing to grow and develop as a vibrant and diverse province, the time for action is now! Energy conservation is pivotal to Ontario’s future. In fact, to keep our power grid healthy, Ontarians will need to reduce their energy consumption by 6,300 Megawatts (MW) by 2025 – that is equivalent to taking one in five electricity consumers off the power grid!
Energy Conservation Week is about the power of collective action. By working together, we can create the culture of conservation Ontario needs to reach its short- and long-term energy conservation goals.
Source: energyconservationweek.ca
Similar holidays and events, festivals and interesting facts
World Endangered Species Day on May 16 (This environmental date is celebrated on the third Friday of May);
Bike-to-Work Day in United States on May 16 (is celebrated on the third Friday of May);
Love a Tree Day on May 16
Whooping Crane Day on May 18
International Fascination of Plants Day on May 18
World Bee Day on May 20 (On this day Anton Janša, the pioneer of beekeeping, was born in 1734);
Volga River Day in Russia on May 20 (celebrated since 2008);
European Maritime Day on May 20 (European Council)