Red Deerians are being encouraged to turn off, unplug and power down for one hour on Saturday.
From 8:30 to 9:30 p.m. on Saturday, Earth Hour will be marked.
The global movement, which saw 7,000 cities in 152 countries participate last year, seeks to raise awareness about climate change, encouraging people to turn off their lights for the one hour.
The City of Red Deer came on board with the initiative in 2009, seeing power reductions ranging from 1.3 per cent to 4.6 per cent for the hour over the four years of participation.
In addition to encouraging residents and businesses to turn off unnecessary power for the hour, non-essential power at some city facilities will be turned off on Saturday night.
City Hall will be going dark and lights at the civic yards will be switched off to mark the occasion.
“Our theme this year is ‘I will if you will,’ which challenges people to take part in a simple act that can create a lasting effect,” said Bailey Doepker, environmental program specialist with the city.