Overview
El Cajon Energy Storage is a 7.5 MW pumped hydro storage facility in California, owned by San Diego Gas & Electric Co. It supports grid reliability and renewable energy integration.
El Cajon Energy Storage is a pumped hydro storage facility located in El Cajon, California, United States. Owned by San Diego Gas & Electric Co, the plant has a capacity of 7.5 MW and is currently operational. As a pumped hydro storage system, it plays a key role in balancing supply and demand on the grid, particularly by storing excess energy during low-demand periods and releasing it during peak times. The facility operates under the regulatory framework of the United States, which includes safety standards such as NFPA 855 for energy storage systems and UL 9540/9540A for battery safety. While pumped hydro is a mature technology with lower thermal runaway risk compared to lithium-ion batteries, it still requires careful siting and environmental considerations. The 7.5 MW capacity places it in the small-to-medium scale range for pumped hydro storage in the US. Environmentally, pumped hydro storage provides significant benefits by enabling higher penetration of renewable energy sources like solar and wind. It helps reduce reliance on fossil fuel peaker plants and supports grid stability. The facility's location in California aligns with the state's ambitious renewable energy goals and its commitment to reducing greenhouse gas emissions.
Environmental context
Pumped hydro storage facilities like El Cajon operate by moving water between reservoirs to store and release energy. While they have a low direct emissions profile, their environmental impact includes land use, water consumption, and potential effects on local aquatic ecosystems. Siting near populated areas requires careful management of noise and visual impacts. In California, such facilities are subject to state and federal environmental reviews to ensure compliance with water rights and wildlife protection regulations.
Frequently asked questions
El Cajon Energy Storage is located in El Cajon, California, United States, at coordinates 32.8115, -117.0505.
El Cajon Energy Storage uses pumped hydro storage technology, which stores energy by pumping water to an upper reservoir and releasing it through turbines to generate electricity.
El Cajon Energy Storage is owned by San Diego Gas & Electric Co, a major utility serving the San Diego region.
Pumped hydro storage in the US is subject to safety standards such as NFPA 855, which provides requirements for energy storage systems, and UL 9540/9540A for battery systems. Additionally, facilities must comply with dam safety regulations and environmental reviews.
El Cajon Energy Storage provides grid services such as peak shaving, frequency regulation, and renewable energy integration by storing excess energy and releasing it when demand is high.