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Quantifying the resilience potential of standalone PV and solar-plus-storage for commercial buildings nationwide

Extreme weather and cyber-attacks can cause power grid outages affecting thousands of buildings at a time, with long term economic consequences. Understanding the ability of commercial buildings to sustain their own critical energy load during grid outages is a necessary step in designing more energy resilient buildings. This study modeled commercial building sites nationwide and measured the expected resilience provided by distributed energy resources such as solar power and battery storage. Each of the 800 locations was configured with two building types, two outage scenarios, and solar and solar-plus-storage technology. Each configuration was then modeled using the REopt Lite design tool to determine the optimal sizing of energy resources to maintain the critical energy load during the outage at the lowest cost. Mean resilience hours and change in life cycle costs were summarized by climate zone. This survey indicated that solar power alone provided on average 2.1 hours of resilience, while solar-plus-storage provided on average 69.2 hours of resilience, and that sites with the greatest resilience and most savings were in climate zone 1-moist (Puerto Rico, Hawaii, Southern Florida). This information will aid building managers in planning sites with maximum energy resilience to prepare for future power grid outages.