Project overview


Up to 320 MW
1,280 MWh


Enough stored energy to power approximately 240,000 California homes for four hours


Supports electric grid reliability by providing a flexible energy resource

Project timeline

Project updates

Upcoming events and meetings


Workshop 2: Battery Energy Storage Safety
Wednesday, April 17, 2024, 6:00 PM-8:00 PM
Del Lago Academy, 1740 Scenic Trail Way, Escondido, CA 92029

Learn about what we are doing to make this project safe, including fire protection strategies, hazard analyses, nationally recognized design standards, advanced battery monitoring systems, and more.


Workshop 3: Protecting and Enhancing the Local Environment
Tuesday, May 7, 2024, 6:00 PM-8:00 PM
San Marcos Community Center, 3 Civic Center Drive, San Marcos, CA 92069

Learn about the project’s environmental and technical studies, including biological, visual, landscaping, noise, stormwater management, and site security features.


Past meetings and events


San Diego County will conduct a public scoping meeting for the Seguro energy storage project. The scoping meeting will involve a presentation about the proposed project and the environmental review process and schedule. The purpose of the meeting is to facilitate the receipt of written comments about the scope and content of the environmental analysis to be addressed in the Draft Environmental Impact Report. The scoping meeting is for information gathering; it is not a public hearing and no public testimony will be taken. No decisions about the project will be made at the public scoping meeting. Read more about the project. Meeting details below:

Date: Wednesday, November 8, 2023
Time: 6:00 PM-8:00 PM
Location: Del Lago Academy (theater), 1740 Scenic Trail Way, Escondido, CA 92029


Workshop 1: Project Overview and Battery Energy Storage 101
Thursday, March 21, 2024, 6:00 PM-8:00 PM
San Marcos Community Center, 3 Civic Center Drive, San Marcos, CA 92069

Learn about how battery energy storage systems work, why they are needed, and hear the latest updates on the design and review process for the project. See video below for a replay of the event.

Environmental & economic benefits

Energy storage

Utilizes land near existing electric grid infrastructure to minimize need for new overhead transmission lines

New E&E Photo 2

Designed in accordance with the latest applicable codes, safety standards, security, lighting, landscaping and noise requirements

New E&E Photo

Expected economic benefits include new tax revenue and local jobs during construction and operations


Alternative shot for indoor storage photo

Environmental and technical studies

The project will be reviewed under the California Environmental Quality Act (CEQA). Environmental and technical studies for the project will include a Phase I Environmental Site Assessment, hydrology, geotechnical, cultural resources, land, topography, biological, wetlands, economic impact and other studies. AES will work with the relevant government and regulatory agencies to mitigate potential environmental impacts from the project.

Community engagement

AES is committed to being a good neighbor and partner to the communities where our projects are located. This includes informing and engaging project stakeholders and the public throughout all phases of the project. AES also supports local contractors, community organizations and programs.

New Community Engagement Photo



Phone (toll-free): 760-546-2228

If you are interested in receiving updates about AES’ Seguro storage project, please fill out and submit this form.