About one-thousand Pacific Power customers in Sherman County will experience a seven-hour electricity outage beginning at 10:30 p.m. Thursday night while the Bonneville Power Administration works on the transmission system serving the area.  Service should be restored by 5:30 a.m. Friday.  The outage will affect customers in Wasco, Moro, Biggs Junction, Grass Valley, Kent and surrounding areas.  Pacific Power customers in those areas are being notified individually about the outage.   They are also being reminded, as a precaution, to unplug any sensitive electronics during the outage and charge their cell phones before the outage or have extra batteries available.  Customers with questions about the planned outage can call Pacific Power toll free at 1-888-221-7070.  Any outages during that time outside the affected area should continue to be reported to Pacific Power at 1-877-508-5088.