On Friday, June 16, offices around the world are asked to turn off the lights for a single hour.

Daylight Hour is an annual social media campaign organized by the Building Energy Exchange to raise awareness about using natural daylight in lieu of electric lighting in offices. Launched in 2014, this simple and engaging campaign asks participating offices to turn off their lights in day-lit spaces for one hour on the Friday before the summer solstice.

It’s good practice to turn off the lights anytime you can use daylight instead of electric light – at home and at work. It will save you energy and money.