Travellers are facing delays as a major Australian airport was plunged into darkness during a reported blackout.

While the reported blackout at Brisbane Airport on Tuesday morning has since been resolved it has affected check-in, baggage sorting and loading of some aircraft.

WATCH THE VIDEO ABOVE: Passengers at Brisbane Airport delayed by blackout and heavy fog.

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Heavy fog in the city has also impacted services.

At least four flights are affected, with some passengers telling 7NEWS there had been no information provided by airport staff while they waited in long lines.

A spokesperson for Brisbane Airport confirmed power has been fully restored.

“An issue with two sub-stations created delays at the northern end of the Domestic Terminal this morning, impacting check-in, baggage sorting and loading of some aircraft,” they said.

“The issue arose at 5.20am, with Brisbane Airport electricians onsite within 15 minutes.

“Power was restored at 6.20am however there were residual impacts for Qantas and Jetstar passengers as the backlog was cleared.

“There has also been heavy fog at the airport. Aircraft continued landing and taking off, however it decreased the speed of movement on the ground. That fog has now cleared.

“We thank the passengers for their patience this morning.”