The Seguro Storage Project (Project) is a Major User Permit from the County of San
Diego (County) to construct, operate, and maintain a 400-megawatt (MW) battery storage
facility located in unincorporated northeastern San Diego county west of the Interstate
(I-) 15 and State Route (SR-) 78 interchange (see Figure 1, Project Location and Figure
2, Project Site). The Project would include development of a battery energy storage system
(BESS) and would interconnect to the San Diego Gas & Electric (SDG&E) Escondido
Substation via a proposed Project generation tie (gen-tie) line. The Project site comprises
the BESS site (approximately 22.55 acres) and an approximately 1-mile gen-tie line and
associated gen-tie corridor to connect to the SDG&E Escondido Substation
(approximately 22.25 acres). Collectively, the BESS site and gen-tie corridor total
approximately 44.80 acres (referred to as the Project site). As the Project moves
through advanced design, the gen-tie corridor would be revised to a single route, but
for the purposes of evaluating impacts, the entire corridor is being evaluated. The
Project site is located within the San Dieguito Community Planning area and is bordered
to the west by County Club Drive, between County Club Drive and Huston Ranch (a
private road). Regional access to the Project site would be provided by I-15 and SR-78.
Primary local access would be provided via County Club Drive, a County maintained
The Project would include the following primary components:
• Battery storage containers: Energy storage enclosures and appurtenances would be
constructed that would provide energy storage capacity and dispatch for the electric
grid. Battery enclosures would be up to 11 feet tall, 9 feet wide, and 40 feet long.
• Inverters and transformers: Power inverters to convert between alternative current
(AC) and direct current (DC) would be included, along with transformers that would
step up the voltage.
• On-site collector substation: The Project would step the electricity from the inverter transformer up to the kilovolt (kV) level of the transmission system, delivering it into
the grid via a gen-tie line. The collector substation would be approximately 240 feet by
• A gen-tie line would be constructed from the on-site collector substation to the SDG&E
Escondido Substation. If overhead, approximately 6 poles structures not to exceed
120 feet tall would be constructed within the gen-tie corridor.
• A detention pond is proposed in the center of the BESS site to collect and process
• Access driveways: Six site access driveways and internal circulation would be
developed on the BESS site.
• Supervisory Control and Data Acquisition (SCADA): One Control Enclosure for the
• Modular battery racks designed for ease of maintenance.
• Integrated heat, smoke, gas, and fire detection system.
• Perimeter security fencing and lighting: The entire BESS site perimeter would be
secured with wood/chain-link/vinyl fencing and/or block/concrete walls, 6 to 10 feet
high. Internal safety lighting would be installed in various locations throughout the
• Improvements to the SDG&E Escondido Substation.
• Temporary construction laydown yard(s).
The proposed 230-kV gen-tie line would carry load to and from the on-site collector
substation and the SDG&E Escondido Substation. The gen-tie line would be located on
undeveloped lands to the east of County Club Drive and extend approximately 1 mile
to the east from the Project’s collector substation to the point of interconnection at the
SDG&E Escondido Substation
County of San Diego - Planning & Development Services
California Air Resources Board (ARB), California Department of Conservation (DOC), California Department of Fish and Wildlife, Cannabis Program (CDFW), California Department of Fish and Wildlife, South Coast Region 5 (CDFW), California Department of Forestry and Fire Protection (CAL FIRE), California Department of Parks and Recreation, California Department of Resources Recycling and Recovery, California Department of Water Resources (DWR), California Energy Commission, California Fish and Game Commission (CDFGC), California Governor's Office of Emergency Services (OES), California Highway Patrol (CHP), California Natural Resources Agency, California Public Utilities Commission (CPUC), California Regional Water Quality Control Board, San Diego Region 9 (RWQCB), Department of Food and Agriculture (CDFA), Department of Toxic Substances Control, Office of Historic Preservation, State Water Resources Control Board, Division of Drinking Water, California Native American Heritage Commission (NAHC), California Department of Transportation, District 11 (DOT)
State Reviewing Agency Comments
California Native American Heritage Commission (NAHC), California Department of Transportation, District 11 (DOT)
Other (Battery Storage)
Aesthetics, Agriculture and Forestry Resources, Air Quality, Biological Resources, Cultural Resources, Cumulative Effects, Drainage/Absorption, Economics/Jobs, Energy, Fiscal Impacts, Flood Plain/Flooding, Geology/Soils, Greenhouse Gas Emissions, Hazards & Hazardous Materials, Hydrology/Water Quality, Land Use/Planning, Mandatory Findings of Significance, Noise, Population/Housing, Public Services, Recreation, Solid Waste, Transportation, Tribal Cultural Resources, Utilities/Service Systems, Vegetation, Wetland/Riparian, Wildfire
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