Criteria Standalone Generators Microgrid Efficient Sizing Oversized by design (2x) As executed often worse Optimal sizing Advantage from the diversity of noncoincident peak power needs Maintenance Large O&M costs Inadequate testing occurs and many of the 100 or more generators on large bases are poorly maintained Easier and less expensive to maintain Relies on a small number of large, standardized and physically centralized generation units Reliability Often poor due to inadequate maintenance and testing N+X reliability is rare and expensive Readily provides a high level of reliability (N+1 or N+2) Networked structure makes it costeffective Flexibility No realistic ability to meet changing requirements Established at procurement Can respond to changes in electricity needs, even during an outage At no additional costs Coverage Forces all or nothing solution for loads (critical or non-critical) Needs are more nuanced Excess generation capacity can serve any load to which the microgrid is connected Intermediate loads can be supported

Criteria Standalone Generators Microgrid Efficient Sizing Oversized by design (2x) As executed often worse Optimal sizing Advantage from the diversity of noncoincident peak power needs Maintenance Large O&M costs Inadequate testing occurs and many of the 100 or more generators on large bases are poorly maintained Easier and less expensive to maintain Relies on a small number of large, standardized and physically centralized generation units Reliability Often poor due to inadequate maintenance and testing N+X reliability is rare and expensive Readily provides a high level of reliability (N+1 or N+2) Networked structure makes it costeffective Flexibility No realistic ability to meet changing requirements Established at procurement Can respond to changes in electricity needs, even during an outage At no additional costs Coverage Forces all or nothing solution for loads (critical or non-critical) Needs are more nuanced Excess generation capacity can serve any load to which the microgrid is connected Intermediate loads can be supported

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