Mountain Wind Interconnection

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Client: Edison Mission Energy
Location: Evanston, Wyoming, USA

POWER provided straight EPC (engineering, procurement, construction) services on these fast-track interconnection projects near Evanston, WY.

Diverse aspects of the work

The project scope of work included a 138 kV three-breaker ring bus switchyard with an ultimate six-breaker configuration designed for the first of several planned interconnection phases along with a control building and microwave communication system; the construction of a three-mile loop-in 138 kV wood pole transmission line feeding to the new Muddy Creek Switchyard; the installation of approximately 5.1 miles of OPGW; re-conductoring approximately 1.6 miles of another 138 kV transmission line and reconstruction of a nine-mile 138 kV line to support the increased load requirements, including replacement of approximately 90 percent of the line structures with much of the work performed on energized lines.

The project was completed in two phases to support the 60 MW Mountain Wind I project and the 80 MW Mountain Wind II project.

Multidisciplinary services

POWER’s services included engineering, procurement, construction, construction management and testing and commissioning services for all of the utilities’ network upgrades related to these projects.

Overcoming challenges

The projects were completed despite significant obstacles including an extremely fast track schedule, work through one of the areas harshest winters on record in southwestern Wyoming, BLM vehicle restrictions during 85 percent of the project and working around nesting raptors.