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Big Sky West Dairy

Location Gooding, Idaho
Project Type Farm Scale
Animal Type Dairy
Population Feeding Digester 4,700
Baseline System Storage Lagoon
Digester Type Mixed Plug Flow
Co-Digestion Organic Wastes
System Designer DVO, Inc. (formerly GHD, Inc.) (Design); Andgar Corp. (Manufacture and Installation); Developed by AgPower Partners
Biogas Use Electricity
Generating Capacity 1,500 kW
Receiving Utility Idaho Power Company

Photo of a 710 kilowatt engine generator set

Photo: AgSTAR

Operational since 2009, Big Sky West Dairy's anaerobic digestion project is owned by a joint venture of Dean Foods and AgPower Partners and is operated by Andgar Corporation. During the Sixth AgSTAR National Conference participants were able to tour this dairy farm and photos are available.

The anaerobic digester project utilizes a modified mixed plug-flow digester designed by GHD, Inc. The digester is fed by a mix of manure from nearly 4,700 dairy cows and a small amount of other organic wastes. The manure is scraped into a flume, flushed into a collection pit, and then pumped to the digester. The biogas produced is then used to fuel two 710 kilowatt (kW) engines, which produce electricity that is sold to the local utility, Idaho Power Co. There is also a two stage solid-liquid separation system that is used for solid separation.

Benefits of the project include:

We are very excited about this project and the benefits it will provide to us in operating our farm.
— Russel Visser, Owner, Big Sky West Dairy, quoted in Dean Foods press release

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