Update 9.20pm: A Powercor spokeswomen confirmed power had been restored to all Portland properties except two.
After a major fault Powercor sends an automated text message to effected customers asking if power had been restored.
Only two properties reported they did not yet have power after the incident involving a B-double- truck hitting a power pole on the corner of Hanlon Parade and Learmonth Street around 12pm on Wednesday.
Update 8pm: The incident is ongoing and the intersection remains closed.
Powercor's website said 837 customers were still without power.
Earlier: Over 800 homes are without power in the Portland area after a truck hit a power pole on Wednesday.
Portland sergeant Ash Rawlings said they received a call around 12pm that a B-double truck had struck a power pole on the corner of Hanlon Parade and Learmonth Street.
"The B-double attempted to negotiate the intersection and struck the power pole," Sergeant Rawlings said.
"The pole was severed at the bottom and is now almost in half and on a lean."
Emergency services attended the scene including three police units and a Country Fire Authority unit.
Customers affected include residents in Portland (497 customers), Portland north (206), Bolwarra (92), Dutton Way (22) and Allestree (20).
Powercor's website said power was expected to be restored by 8pm on Wednesday.
The intersection is currently blocked and will be for some time.
Have you signed up to The Standard's daily newsletter and breaking news emails? You can register below and make sure you are up to date with everything that's happening in the south-west.