More than 900 homes and businesses at Engadine and Yarrawarrah lost power Wednesday morning after a fault on a local underground cable near Railway Parade.
Ausgrid crews managed to restore power a short time later.
Power was cut to about 600 homes and businesses at Kareela, Gymea and Sylvania on Friday because of another local underground cable fault.
About 2300 homes in and around Beverly Hills and 600 at Sans Souci were affected by a blackout on Saturday.
Have you been affected by power failures?