Past Project

SR99 Alaskan Way Replacement Electrical for “Big Bertha”

Sundancer Electric provided power and maintenance for the Tunnel Boring Machine (TBM) through the entire boring duration.

The power was maintained at approximately 23KV by using sectionalized umbilical power cables. Sundancer essentially extended power to the TBM as it made progress through the tunneling process. Sundancer also provided and maintained repairs to all control, PLC, and instrumentation devices from beginning to end.

  • Owner:  WSDOT
  • Prime Contractor:  Seattle Tunnel Partners (Dragados USA and Tutor Perini)
  • Value: $11m