Residents have been urged to check their electrical appliances following a power surge in areas of south-east Melbourne.

The surge was experienced in the Mount Martha, Mornington and Moorooduc areas between Craigie Road and Bungower Road.

The Country Fire Authority (CFA) says an over-voltage this morning has caused some household appliances to fail.

"While no fires have occurred, some residents have reported the smell of smoke or burning plastic in their homes as a result of the power surge," the CFA said on its website.

Anyone who suspects their home may have been affected by the power surge can follow steps set out on the CFA website.

Editor's note: This story has been updated with new information from the CFA after a spokesman had earlier suggested that almost 50 house fires had been caused by the surge.