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Fire Safety Fire detection measures would be incorporated in the Project design in accordance with National Fire Protection Association safety standards. The fire safety system will include remote monitoring 24 hours per day, 7 days per week. Power Conversion System The PCS consists of an inverter, protection equipment, direct current (DC) and alternating current (AC) circuit breakers,filter equipment, equipment terminals, and connection cabling system. Electric energy is transferred from the existing power grid to the Project batteries during a battery charging cycle, and from the Project batteries to the power grid during a battery discharge cycle. The PCS converts electric energy from AC to DC when the energy is transferred from the grid to the battery, and from DC to AC when the energy is transferred from the battery to the grid. The energy conversion is enabled by a bi-directional inverter that connects the DC battery system to the AC electrical grid. The PCS would also include a transformer that converts the AC side output of the inverter to medium AC voltage to increase the overall efficiency of the energy storage system and to protect the PCS in the event of system electrical faults. Interconnection Generation Transmission Line The proposed battery energy storage system would deliver power to the Tesla Substation located adjacent to the Project site in Alameda County through a new 230 kilovolt gen-tie line.The Applicant would construct the gen-tie from the Project substation to the point south of the Tesla Substation shown on Figure 1. The gen-tie line would require new steel,tubular poles up to approximately 165 feet in height. The poles may be A-frame, H-frame, monopole, or a combination thereof. The number and height of the poles would be finalized during detailed design. PG&E would be responsible for siting,design,and construction of the gen- tie line to their property boundary and within the Tesla Substation.As shown on Figure 1, PG&E may elect to install the interconnection via an overhead line or underground from the point of connection to the substation. Ancillary Facilities Site Access and Parking Access, including emergency access, onto the Project site would be provided from Patterson Pass Road to Midway Road to a driveway that leads to the Project site. Internal access roads would be gravel or aggregate base depending on the final site geotechnical report. Site access would comply with the CalFire and/or San Joaquin County Fire Protection District requirements. On-site parking spaces would be provided as needed, in accordance with San Joaquin County requirements. Perimeter Fence The perimeter of the Project site would be enclosed by a 6-foot-tall chain-link fence topped with 1 foot of 3-strand barbed wire. The purpose of the fence would be to prevent unauthorized access to the site. In addition,an approximately 8-foot-high perimeter security fence topped with approximately 1 foot of barbed wire would be installed around the on-site substation. Lighting Low-elevation, controlled security lighting would be installed at the access gate and the entrance to the energy storage structures.The lighting would only switch on when personnel enter the area (through either motion-sensor or manual activation [switch]). All safety and emergency services signs would be lit when the lights are on.The lighting would be shielded so the light is directed downward. Lighting would be only in areas where it is required for safety, security, or operations. All lighting would be directed on-site and would include shielding as necessary to minimize illumination of the night sky or spillover onto adjacent properties. Stormwater Facilities The site drainage is designed to follow the natural drainage pattern of the site. The Project would include swales and armored outlets to direct stormwater, as shown in the preliminary grading and site plan provided as Figure 2, and in accordance with San Joaquin County and state of California standards. Site preparation and construction activities would be performed in accordance with a Stormwater Pollution Prevention Plan(SWPPP),or similar plan that incorporates stormwater best management practices(BMPs) to reduce the adverse effects of erosion and sedimentation. Such practices would include, for example, the use of water trucks to manage dust; silt fencing, straw wattles and temporary catch basins, and inlet 3