About 560 Klickitat PUD customers northwest of Goldendale were affected by an early morning power outage.  Klickitat PUD says an equipment failure at the L.E. Darland substation at around 2 a.m. Thursday caused the outage.  Crews were able to replace a high-voltage primary fuse in the Substation and restore power.  The cause of the equipment failure is under investigation.  As a result, Klickitat PUD is planning a scheduled power outage this coming from Tuesday from 9 a.m. to 1 p.m. to complete transformer testing in the substation and investigate the cause of Thursday morning’s outage.  That will again affect portions of Highway 142, the Glenwood Highway, Garrison, Turkey Ranch, Cedar Valley, Fish Hatchery, and Block House areas.