Passengers can expect delays at Sydney's domestic terminal because of a power outage.

There has been a power interruption at the T2 terminal on Friday morning, confirmed a spokeswoman at Sydney Airport.

The power problems are causing delay at check-in and screening, the spokeswoman told AAP on Friday.

Airlines that operate from the T2 terminal include JetStar, Virgin and Tiger airlines.

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The whole T2 terminal is affected by the power outage, and Sydney Airport is working to restore power.

It comes as NSW school holidays kick in.