The Dalles Dam Station Service Improvements


Olsson Industrial Electric completed a comprehensive modernization of the station service electrical distribution system at The Dalles Dam, a 2100 MW hydroelectric power generation facility, as the prime contractor. Olsson upgraded the existing 1950’s vintage control system, rerouted and installed new power distribution feeders, replaced wire distribution to improve the quality of the cable infrastructure, and connected a secondary power source to create internal redundancy. The electrical upgrades improved turbine control, power generation efficiency, system reliability and serviceability.


  • Replaced 4160 V station service protective relaying and breaker controls
  • Installed 2 new 5000 kVa station service transformers
  • Replaced 13.8 kV CLR & vacuum switchgear at main unit Isolated Phase Bus (IBP)
  • Retrofitted five 480 V station service substations and MCC sections
  • Installed 5 new 500 kVA transformers, switchgear sections, and 4160 V switchgear
  • Retrofitted all existing 4160 V switchgear sections
  • Designed, installed and tested redundant DC and preferred AC systems


  • Zero safety incidents while working in a hydroelectric generation power production facility
  • “Outstanding” performance rating from the U.S. Army Corps of Engineers
Client: U.S. Army Corps of Engineers
Location: Klickitat County, Washington
Timeline: September 2008 – December 2013
Divisions: Construction, Controls & Engineering
Value: $26,000,000


Heavy Industrial Electrical Construction
Hydro Design
Hydro Maintenance
Power Distribution

Industry Served:

Hydroelectric & Hydropower

Area Served:

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