ERGON Energy customers in the Stanthorpe region have been asked to limit their power use for the next few hours until the network is returned to full capacity.
A broken cross-arm on the 110kV power line near the Warwick Golf Club caused the power supply to 5400 customers to be interrupted about 10.10am.
Supply has been restored to the Stanthorpe substation from a 33kV line, but it does not have the capacity to supply all customers.
As a result, there will be load shedding in the region until the broken cross-arm can be replaced, which is expected to be completed by about 2.30pm.
By limiting their power use, customers will limit the numbers who have to remain off supply.
Customers have been affected in Amiens, Applethorpe, Ballandean, Dalveen, Glen Aplin, Severnlea, Stanthorpe, The Summit, Thulimbah and surrounding areas.