Earth Hour 2009

One of the least co-operative areas traditionally has been Alberta; in 2008, Calgary's power consumption went up during Earth Hour. The trend continued in 2011 when Edmonton's power usage also increased. While Calgary's power usage went down in 2011 during the event, electricity officials could not distinguish their readings between normal usage and a conscious attempt to participate.
2010
Earth Hour 2010 was held from 8:30 p.m. to 9:30 p.m. local time, March 27. In Israel, the hour was held on April 22.