U.S. awards Garrison Dam hydro project transformers contract

The U.S. Army Corps of Engineers awarded a contract for replacement transformers and and site modifications at the 517.8-MW Garrison Dam hydro project on the Missouri River in Garrison, N.D.

The $4.9 million contract was awarded to Texas-based IES Commercial Inc.

The Corps’ Omaha District hired L&S Electric in 2007 to retrofit governors at the hydroelectric project.

The transformer work is to include removal of six single-phase 115-kV GSU transformers, reconstruction of the transformer deck to accommodate two new 115-kV three-phase GSU transformers, removal and replacement of the isolated phase bus, replacement of oil-filled high-voltage cables with solid-dielectric high-voltage cables, replacement of the generator neutral grounding system, installation of a transformer deluge and containment system, replacement of transformer controls and relaying, replacement of the annunciation system, and synchronization of potential transformers.

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