The introduction of solar and storage battery systems is required as a countermeasure against global warming, which is becoming more serious every year, and as a way to improve resilience against power outages caused by natural disasters. However, the introduction of solar and storage battery systems has not progressed because the required capacity and the effect of the introduction are unclear for each facility. In this study, we have conducted a case study focusing on the economic evaluation of Solar photovoltaic battery systems and power outage response capability and calculated the effectiveness of installation. The target facilities are junior high schools that are actually used as emergency evacuation sites. The period of the analysis is assumed to 20 years with a power outage occurring once in the period. The profits include the selling electricity by the Solar photovoltaic during normal times, the savings in electricity charges, and the value of avoiding power outages. The value of avoiding power outages means the amount of time that power outages can be avoided with Solar photovoltaic battery systems, and defined as a monetary value using the power outage cost index called VOLL (Value of lost load). The costs include the system costs and O&M expenses.
