Chicago Skyline to go dark for Earth Hour

At 8:30 p.m. on Saturday, March 27, the Chicago Theater's famous marquee went dark as part of Earth Hour 2010, sponsored by ComEd. (Photo by ComEd). (PRNewsFoto/ComEd)

March 26, 2011 6:40:45 AM PDT
Lights off, Chicago! On Saturday the Second City's skyline- and others across the nation and world- will dim for Earth Hour.

At 8:30 p.m. on Saturday, March 26, 2011, some of Chicago's tallest skyscrapers will turn off some lights to conserve energy. Thousands of residents also participate each year.

While Earth Hour is largely symbolic, ComEd said the hour does make a difference.

"Last year during Earth Hour customers turned off their lights and we were able to save enough energy to remove more than 124,000 pounds of carbon dioxide from the atmosphere. That's the equivalent of planting 15 acres of trees," Krissy Posey, ComEd, said.

Earth Hour is this Saturday night from 8:30 to 9:30 p.m. Learn more about the Chicago effort at and