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Visual Impact Assessment Griffith Energy Storage Project 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 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 BESS and to protect the PCS in the event of system electrical faults. 3.1.2 Interconnection Generation Tie 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-kilovolt gen-tie line.The Applicant would construct the gen-tie line from the Project substation to the point south of the Tesla Substation shown on Figure 1. The gen- tle 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 its 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 change of ownership to the substation. 3.1.3 Ancillary Facilities 3.1.3.1 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. Onsite parking spaces would be provided as needed, in accordance with San Joaquin County requirements. 3.1.3.2 Perimeter Fence/Soundwall 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 onsite substation. If soundwalls are required as a form of mitigation to reduce the sound levels at the nearby residential receivers,they are estimated to have a height up to 15 feet above grade and border the Project to the OTETRA TECH 7 August 2023