HOMER Grid 1.1
Unmet load is electrical load that the power system is unable to serve. It occurs when the electrical demand exceeds the supply. For each system, HOMER calculates the total unmet load that occurs over the year, as well as the unmet load fraction. By default, HOMER considers any system that experiences unmet load infeasible, but you can change that by entering a non-zero value for the maximum annual capacity shortage.
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