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A biogas utilization study identified both internal combustion engines and microturbines as competitive alternatives for retrofit of the existing cogeneration system at the Oceanside Water Pollution Control Plant, San Francisco, California. To select a single preferred alternative to be carried forward into the conceptual design phase of the project, a multi-attribute evaluation of the alternatives was performed. Key criteria developed by the project team, force ranking of the criterion to establish weighting of the criteria, and detailed evaluation of the alternatives is presented. Ultimately, the internal combustion engine alternative was recommended, driven largely by the ability of the internal combustion engines to be able to more fully utilize the average and the maximum month biogas production at the Oceanside plant and physically fit within the existing facility. In addition, for this particular evaluation, the internal combustion engine alternative resulted in a higher net present value due to higher conversion efficiency of fuel to electrical power, while providing a higher product maturity ranking with equipment available from multiple equipment suppliers.

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