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2 Project Description <br /> battery units would be installed. Each would be approximately 20 feet long, 8 feet wide, and <br /> approximately 10 feet high. The associated inverters, transformers, and switchgear would be <br /> located adjacent to the structure on concrete pads or driven pier foundations. At this time, the <br /> battery technology for the Project has not yet been finalized; the battery type would be selected <br /> based on the technology available at the time of construction. <br /> 2.5.2.2 Enclosure Units and Controller <br /> Self-contained storage system enclosures would house each of the approximately 500 battery <br /> units, described above, as well as the battery storage system controller. The energy storage <br /> system controller is a multi-level control system designed to provide a hierarchical system of <br /> controls for the battery modules, power conversion system (PCS), medium voltage system, and <br /> up to the point of connection with the electrical grid. The controllers ensure that the energy storage <br /> system effectively responds to grid emergency conditions and provide a secondary safety system <br /> designed to safely shut down the facility. <br /> The storage system enclosure would also house required heating, ventilation, and air conditioning <br /> (HVAC) and fire protection systems. The power for the HVAC system would be provided through <br /> a connection to the on-site station service transformer with connection lines installed above and/or <br /> below ground. <br /> 2.5.2.3 Fire Safety <br /> Each battery enclosure unit would have a fire rating in conformance with local fire authority and <br /> County standards, via compliance with the California Fire Code 2022. The Project's fire protection <br /> design would comply with Section 1207 Electrical Energy Storage Systems, which adopts the <br /> National Fire Protection Association's Standard for the Installation of Stationary Energy Storage <br /> Systems (NFPA 855). It is the Applicant's intent that Underwriters Laboratories (UL), an <br /> independent engineer's test method, would certify that the batteries used in this Project are <br /> manufactured in accordance with UL 9540A, an industry-standard Test Method for Evaluating <br /> Thermal Runaway Fire Propagation in Battery Energy Storage Systems. UL independently tests <br /> equipment for compliance with the latest fire safety code requirements. This test method was <br /> developed to minimize the risk of thermal runaway to address safety concerns about battery <br /> storage equipment raised by fire departments and building officials in the United States. <br /> Compliance with these standards and certification includes a Battery Management System (BMS) <br /> design that detects high temperatures at the battery cell or battery module level and automatically <br /> shuts down the battery rack. Furthermore, installation of battery units would follow manufacturer <br /> specifications for the spacing of batteries and clearance distances to further prevent a thermal <br /> runaway event. Each unit would also be equipped with thermal management systems for thermal <br /> management of the batteries. Power to the thermal management system and lighting would be <br /> provided through a connection to the on-site station service transformer with connection lines <br /> installed above and/or below ground. Cabinets housing batteries are designed with adequate <br /> ventilation and will also be equipped with carbon monoxide (CO) detection that would alert the <br /> remote monitoring facility that the sensor has been activated. <br /> 2.5.2.4 Power Conversion System <br /> The PCS consists of an inverter, protection equipment, direct current(DC) and alternating current <br /> (AC) circuit breakers, filter equipment, equipment terminals, and connection cabling system. <br /> Griffith Energy Storage Project 2-5 Tetra Tech/SCH 2022120675 <br /> Draft Environmental Impact Report August 2023 <br />