Solar + Storage Synergies for Managing Commercial-Customer Demand Charges


This work is part of a series of studies exploring demand charge savings from solar

• Prior studies focused on demand charge reductions from solar PV on a standalone basis (without storage), for both residential and commercial customers
• Those studies highlighted several constraints on the ability of solar PV to reduce demand charges, which storage could help to alleviate

This analysis estimates demand charge reductions from solar + storage
• Across 15 commercial building types in 15 U.S. locations, with varying solar and storage system sizes and a range of demand charge designs
• Over a 17-year period that captures weather-related variability in PV generation and customer loads This study quantifies “synergies” between solar and storage—that is, the potential for demand charge savings greater than the sum of what each would achieve alone



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