Power Returns After Sydney Outage Hits 45,000

Power has been restored to about 45,000 homes and businesses in Sydney's east after an hour-long outage in hot temperatures.

Supply was interrupted shortly before 11.30 am on Friday in more than a dozen suburbs, including Randwick, Bondi, Coogee, Point Piper, and Rose Bay.

The outage was caused by a fault in an underground cable at Double Bay, Ausgrid said in a statement.

Emergency crews fixed the issue by 12.30 pm.

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Temperatures at Sydney Airport had climbed above 37C by lunchtime and nudged 36C in the CBD. They're forecast to reach 40C before a gusty southerly change.

The Australian Energy Market Operator earlier said it was working "around the clock" to keep the state's energy system secure.

Liddell power station is one of the two coal-fired stations to break down. (Image AAP)

"Even with forecast temperatures in NSW hitting the high 30s today, as at 10:30 am there is more than 1,000 MW of energy reserves forecast to be in place to lean on if required," the agency tweeted on Friday.

It comes a day after two coal-fired power stations - Liddell in NSW's Hunter Valley and Eraring at Lake Macquarie - reportedly suffered broken generators.

Feature Image: Twitter/@Ausgrid