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Considerations with Distributed Generation: Operation & Maintenance

The operation and maintenance (O&M) costs of DG technologies have both fixed and variable components. Fixed O&M costs consist primarily of plant operating labor. It is highly dependent on the operating cycle and staffing of the plant. Variable O&M costs represent variable maintenance costs and are estimated from an algorithm incorporating a DG unit's expected capacity factor. The variable O&M costs include periodic inspection, replacement, and repair of system components (i.e., filters, desulfurizer, etc.), as well as consumables (i.e., water, limestone, etc.) computed directly from the DG plant material balance. The table on the following page lists sample maintenance intervals and costs for a variety of DG technologies.