UK 's Scilly Isles take part in a day - long event monitoring electricity consumption . Islanders being asked to switch off all non - essential electrical services . At the time of writing , the family 's consumption had dropped dramatically , down 35 percent on the previous day , which Prescott estimates is a saving of around £300 ( $ 475 ) on their annual electricity bill . Earth Summit Day is the culmination of a three - day long Earth Summit on the planet .
UK 's Scilly Isles take part in a day - long event monitoring electricity consumption . Islanders being asked to switch off all non - essential electrical services . Earth Summit Day is the culmination of a three - day long Earth Summit on the planet .