Fire crews are attending to two electricity transformer fires in Castlecliff and power has been cut to part of the suburb.

A Fire and Emergency spokesperson said a transformer was reported on fire near Egmont St at 7.20pm on Sunday.

"It caused the power line to arc," he said.

"Power authorities are there isolating power to the area."

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One fire crew is on the scene and there is a strong burning smell in the air.

At 8pm another transformer exploded in the area, the spokesperson said.

Powerco is reporting 98 properties have been affected.