Commonwealth 245 West Michigan Avenue,
Jackson, MI 49201

Avista Corporation

Avista needed to fulfill a large generator interconnection, in this case, a wind farm, with firm deadlines for the design completion to meet the contractual in-service date. Commonwealth supported Avista by managing the scoping process, which developed the preferred layout. Commonwealth provided engineering design services for the needed substation for interconnection. This design included the civil/structural, physical, protection, and integration design, material procurement, transmittal of the final design, construction support, and record drawings. The initial design functions as a three-position ring bus, which can be expanded into a six-position, breaker-and-a-half arrangement.

The substation intersects a radial 115 kV transmission line and provides the Point of Interconnection for the wind generation facility. The physical layout followed the bus configuration of two bays from the standard breaker-and-a-half configuration with only three circuit breakers and their associated switches. The ultimate general plan was laid out for six-line positions in a three-bay, breaker-and-a-half bus arrangement. There were no plans for adding distribution feeders since this location is in an area not served by Avista Utilities. The panel house was sized to accommodate current and future transmission lines.

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