Observance of Daylight Hour

On June 17, 2025, participants from all over the world will turn off their lights for one hour (from noon to 1:00pm, local time) and share their experiences via social media. Join the #DaylightHour campaign to promote sustainability and save energy. This year, we aim to save 40 Empire State Buildings worth of energy in one hour.

There will also be an event on the Great Lawn during that time. Register: https://bit.ly/CSIDaylightHour2025