Energy Efficiency Day
Energy Efficiency Day is held on October 5. This event in the first decade of the month October is annual. 
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Using energy more efficiently is one of the fastest, most cost-effective ways to save money, reduce greenhouse gas emissions, create jobs, and meet growing energy demand.
60 minutes of solar energy could power the Earth for a year. 10 Google searches can power a 60-watt lightbulb.
More than 2.2 million Americans have jobs in energy efficiency or clean energy production. That's more than five times the jobs in the dirty energy industries, including coal, gas, and oil. In fact, about one in every six construction jobs in the country is connected to energy efficiency.
Similar holidays and events, festivals and interesting facts
World Farm Animals Day on October 2
Arbor Day in Poland on October 10 (Święta Drzewa);
World Algae Day on October 12
National Fossil Day in USA on October 13
Arbor Day in Namibia on October 13 (Held on the second Friday of October);
Fall World Migratory Bird Day on October 14 (Held on the second Saturday of May and October with the support of the United Nations Environment Program - UNEP);
World Environmental Education Day on October 14 (established in 1991);
Wildlife Workers Day in Russia on October 14 (unofficial professional holiday)