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4 Environmental Analysis 4.8 Greenhouse Gas Emissions SJCOG 2018 RTP/SCS and would not conflict with an applicable plan and the Project would have a less than significant impact. Mitigation: None required. 4.8.6 Pacific Gas and Electric Tesla Substation Improvements To accommodate the Project, PG&E would be responsible for siting, design, and construction of the gen-tie line from the point of change of ownership (POCO) to its substation. Two options are available for the gen-tie line route from this point. The first option would be to connect via an aboveground line from the POCO to a point on the west side of the southwestern boundary of the substation. The second option is to enter the substation on the southwestern edge by way of a belowground line as shown in Figure 2-1 of Chapter 2, Project Description. Either right-of-way corridor is assumed to be up to 100 feet in width. Additionally, PG&E would upgrade the Tesla Substation, and the improvements would include the installation of a grounding system, disconnect switches, surge arresters, outdoor lighting and outlets, and fiber termination for the gen-tie line. The improvements made would be within the existing Tesla Substation footprint. These improvements are included in the analysis above, such that they would not be significant to the environment, nor would the improvements affect any plan, policy, or regulation regarding the reduction of GHG emissions. Accordingly, the PG&E Tesla Substation improvements and construction of the gen-tie line from the POCO to its substation would have no impact on significance criteria 4.8-1 and 4.8-2. No mitigation measures would be required. 4.8.7 Cumulative Impacts Impacts from GHG emissions are inherently cumulative, that is, significant and adverse. Accordingly, the significance of GHG emissions in this analysis is determined based on whether such emissions would have a cumulatively considerable impact on global climate change. Although the geographic scope of cumulative impacts related to GHG emissions is global, this analysis focuses on the Project's direct and/or indirect generation or offset of GHG emissions on the region and the state. CAPCOA considers GHG impacts to be exclusively cumulative impacts in that no single project could, by itself, result in a substantial change in climate (CAPCOA 2008). Therefore, the evaluation of cumulative GHG impacts presented above evaluated whether the Project would make a considerable contribution to cumulative climate change effects. The Project would result in a net reduction in GHG emissions from power generation and would not conflict with the state's GHG reduction goals. Therefore, the Project- specific incremental impact on GHG emissions would not be cumulatively considerable. 4.8.8 References Alameda County 2014. Alameda County (Unincorporated Area) Community Climate Action Plan. Available online at: Griffith Energy Storage Project 4.8-12 Tetra Tech/SCH 2022120675 Draft Environmental Impact Report August 2023