TELSTRA customers in Ballarat have been impacted by an outage which has affected ADSL and landline services.
A failing power supply for a piece of equipment has been identified as the cause of the outage, which has impacted 148 landline services and 97 ADSL services in the postcodes of 3350, 3353 and 3354.
The unplanned outage began last night at about 8pm.
Telstra regional general manager Bill Mundy said services were expected to be restored by close of business today.
He said it was unclear what had caused the power supply to fail.
"All we know is that it's a power issue, the power to the equipment has been affected," he said.
"Once the guys are on site they'll establish the cause. They will be there today and get it done."