UPDATE as of 10 p.m. Puget Sound Energy said crews found failed equipment on the transmission line in Sumner, and were working to reroute power from other circuits.
INITIAL POST: About 9,000 people lost power in South King County and East Pierce County on Thursday night, according to Puget Sound Energy.
Crews were on their way to the Sumner substation about 7:20 p.m., and had not yet determined what caused the outage, spokeswoman Abigail Elliott said.
Residents in the areas of Algona, Auburn, Bonney Lake, Pacific, Sumner and Lake Tapps appeared to be affected.
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The outage was affecting a transmission line to the company’s Sumner substation.
Crews expected to have power back about 11 p.m., but would know more once they got on scene, Elliott said.
Further details were not immediately available. Check back for updates.