Perth power outage: Homes in Inglewood, Westminster and Mount Lawley still without power

Hundreds of homes are still without power across Perth, following mass blackouts as the city sweltered on Wednesday.

Nearly 300 Inglewood, Westminster and Mount Lawley homes were still waiting for power to be restored as of 4.45pm on Thursday.

They are estimated to have their homes reconnected to the electricity network by 6pm.

At the peak of Wednesday’s blackouts, more than 18,000 homes and businesses lost electricity.

It came as temperatures in Perth reached a blistering 40C.

Western Power said strong wind conditions and transient faults sparked the power outages.

Quinn’s Rocks’ Portofinos restaurant said it had to cancel dozens of bookings, costing them more than $10,000 after having their power out for eight hours.

The situation could have been worse if power had been restored any later.

“Twelve hours and it would have been diabolical,” a spokesman told 7NEWS.

“It’d be a mess, we probably wouldn’t open up for a good couple of days to sort of regroup and sort of restock our supplies.

“So that’d be diabolical, you’d be a mess.”

The entire Mindarie Marina also lost power, meaning The Boat and Indian Ocean Brewing Co were forced to cancel their dinner services.

Western Power crews earlier on Thursday were working on restoring power to 12,000 homes and businesses.