Signing up to switch off can help Australians doing it tough unite amid the coronavirus pandemic, say Earth Hour organisers.
With many Australians isolated and feeling powerless in the face of the virus, the annual 'hour of no power' is back and can give people a sense of community.
"We really wanted to harness this opportunity to encourage people to feel connected when we're being encouraged to distance ourselves," Earth Hour's campaign coordinator Jasmine Ledger Ledger said.
Earth Hour organisers are expecting one in five Australians to switch off their lights for an hour to raise awareness for climate change this year.
Started in Sydney more than a decade ago, millions of people in more than 180 countries took part in the World Wildlife Fund event in 2019.
Ledger says symbolism like turning off the light can empower people in a time when they are being discouraged from gathering, as well as supporting causes that mean a lot to them.
"It's a great opportunity for us to connect and to demonstrate solidarity even though we can't be near those that we care about."
People can also turn to a live-streamed music and comedy show with the group moving its entire event online after activities were cancelled because of social distancing measures.
"We really want to make this Saturday night in feel like a Saturday night out," Ledger said.
Dr Jemma Todd, a psychologist from the University of Sydney, said Earth Hour can provide a symbolic feeling of connection for many people feeling isolated during the mandated quarantine.
"We're social beings which I think is being challenged a lot right now with the measures in place," Dr Todd said.
"But being particularly distant doesn't mean we need to be distant socially as well."
"Finding little ways to bring some enjoyment back into our lives so that might be listening to music or indeed humour is really important at the moment."
People can sign up for the event through the WWF's Australian website.