Earth Hour will be observed in 135 countries worldwide as people switch off their lights for 60 minutes.
Saint John Energy's VP of Engineering and Operations Darin Lamont tells CHSJ News it's important to take part at 8:30 tonight.
Lamont says you should take part between 8:30 and 9:30pm tomorrow in order to help reduce energy consumption.
He says Saint John on average is turning off the equivalent of 36,000 lights during Earth Hour adding on Monday morning they will examine the numbers to see how it went this year.
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