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2 Project Description 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 bidirectional 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. 2.5.2.5 Interconnection Generation Transmission Line The proposed BESS would deliver power to the Tesla Substation located adjacent to the Project site in Alameda County through a new 230-kV gen-tie line. The gen-tie corridor width would be up to 100 feet wide on private property, with the exception of the portion that would encroach on Midway Road, requiring a Utility Roadway Permit approved by Alameda County. The gen-tie right- of-way (ROW) corridor is assumed to be up to 100 feet in width and include a maintenance road. Permanent impacts for the aboveground line would occur associated with the pole pads and access roads and temporary impacts associated with pull and splice sites and overland travel during construction. Associated with trenching to install the ducts, surface construction impacts from the below ground option would be temporary. Permanent impacts would result for the construction of an access road. The gen-tie line would not include lighting or stormwater features. The Applicant would construct the gen-tie from the Project substation to the point south of the Tesla Substation shown on Figure 2-1. 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 2-1, PG&E may elect to install the interconnection via an overhead line or underground from the point of connection to the substation. 2.5.2.6 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 California Department of Forestry and Fire Protection 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. 2.5.2.7 Perimeter Fence The perimeter of the Project site would be enclosed by a 6-foot-tall chain-link fence topped with 1 foot of three-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. Griffith Energy Storage Project 2-6 Tetra Tech/SCH 2022120675 Draft Environmental Impact Report August 2023