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Six thousand homes were left without power in Sydney's west following a fault at a substation.
The homes lost power just after 9pm (AEDT) on Wednesday after a safety system switched off power to homes in Rooty Hill and Eastern Creek, an Endeavour Energy spokesman told AAP.
While the majority of homes had their power restored less than an hour later, 2000 homes experienced poor quality electricity supply until just before 11pm.
The Endeavour Energy spokesman said the outage was due to faulty switch gear in a distribution substation.
Maintenance on the substation will take place on Thursday morning, he said.