Fire engulfs major substation south of Sydney, with one transformer fully alight

More than a dozen fire crews have been called to a fire at a major power substation south of Sydney, with Fire and Rescue NSW reporting multiple explosions at the site. 

Fire and Rescue NSW around 80 firefighters were called to the site on Yallah Road, Wollongong on Saturday afternoon.

Authorities say there are no reports of injuries, although one person was evacuated from the site.

The blaze is having no impact on the nearby Tallawarra Power Station and will not impact the electricity supply to customers.

One transformer at the substation is fully alight while a second is at risk.

Fire and Rescue NSW said approximately 1,000 litres of oil is being contained. 

A large smoke plume from the blaze is affecting nearby Wollongong and Unanderra, with flights at nearby Shellharbour Airport delayed.

Fire and Rescue NSW urged residents to stay indoors with windows and doors closed until air quality improves. 

"The fire is not escalating and emergency services are now preparing to extinguish the fire," a Transgrid spokesperson said.

"All personnel on site are accounted for and safe.

"The smoke emanating from the site is not toxic. This will continue for some time."

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AEST = Australian Eastern Standard Time which is 10 hours ahead of GMT (Greenwich Mean Time)