More than 13,000 people across Sydney are without power after the city's hottest day of the year.
As temperatures soared to 38 degrees in the city and 42 degrees in Western Sydney, power cuts hit parts of New South Wales at around 3:30pm.
A spokeswoman from Ausgrid told The Huffington Post Australia the outages -- which impacted the North Shore, Sydney, south coast and parts of Western Sydney -- were not heat-related.
Ten thousand people in Caringbah, on Sydney's south coast, went without power for about an hour on Wednesday night after party balloons hit power lines. Power in the area has since been restored.
Areas still affected include Punchbowl, Godford, Blue Haven, Green Point, North Ryde, Wheeler Heights and Pymble.
Earlier in the week, NSW authorities were urging people with respiratory conditions such as asthma to take caution across the state, with high air pollution levels increased by high ozone levels.
Queensland also experienced soaring temperatures on Wednesday, with temperatures set to spike on Saturday. Brisbane is forecast to rise to 36 degrees while parts of central Queensland are predicted to peak at 40 degrees.
NSW Health has instructed people to drink plenty of water, keep cool, take care of others and also have a plan.
Here's how Australians across the east coast have kept cool.