Grid Resiliency with a 100% Renewable Microgrid Final Technical Report (FTR)

Summary

San Diego Gas & Electric (SDG&E), in partnership with NREL, successfully demonstrated a 100% renewable microgrid in Borrego Springs, California. The project upgraded the 1 MW/3 MWh AES2 battery energy storage system to be a grid-forming island leader, validated through extensive Hardware-in-the-Loop (HIL) simulations and field tests. Field tests in November 2023 showed that the microgrid could blackstart with a minimum frequency of 59.73 Hz, stabilizing in less than 2 minutes, and perform planned islanding with a minimum frequency of 59.98 Hz, achieving primary stability in 40 milliseconds. To further enhance resilience, SDG&E plans to add six more battery containers, increasing the microgrid's total capacity to 7 MW/14 MWh to support the entire community's load, significantly reducing reliance on fossil-fueled generators.

Key Facts

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