Jakarta marked World Ozone Day with a one-hour citywide blackout on September 19, 2026, cutting carbon emissions by 74.23 tons of CO2e. The coordinated power outage from 20:30 to 21:30 local time also saved 92.79 MWh of electricity, equivalent to roughly Rp134.27 million in costs, according to the DKI Jakarta Environment Service. The savings represent a 23.42% increase over a similar blackout held for World Environment Day in June 2026. Officials emphasize the symbolic action is meant to encourage daily energy-saving habits, like turning off unused lights and appliances. While the reduction is small relative to Jakarta's total emissions, the event highlights the potential for behavioral change and the importance of consistent energy efficiency practices.
