HOMER Grid combines engineering and economics to rapidly perform complex calculations enabling you to compare design outcomes and consider options for minimizing project risk and reducing energy expenditures. This is a demonstration of using HOMER Grid to model a power system to provide continuous power to a critical electric load during a power outage. HOMER Grid can model two types of outages - infrequent extended outages that might be associated with a natural disaster, and more frequent random or planned outages for shorter periods of time.