AES ES GILBERT Pumped Hydro Storage Facility, Gilbert, Arizona

AES ES GILBERT is a pumped hydro storage facility located in Gilbert, Arizona, United States. With a capacity of 10 MW, it operates as a grid-scale energy storage asset, helping to balance supply and demand on the local power network. The facility is owned by AES ES GILBERT LLC and is currently operational. Pumped hydro storage is a mature technology that uses two water reservoirs at different elevations to store and generate electricity. During periods of low demand, excess electricity pumps water to the upper reservoir; during peak demand, water is released to generate power. This facility operates under U.S. regulatory frameworks including NFPA 855 for energy storage safety and UL 9540 for system certification, ensuring safe and reliable operation. The facility plays a key role in Arizona's energy landscape by providing peak shaving and frequency regulation services. Its location in the arid Southwest highlights the importance of water-efficient operations, though pumped hydro remains a low-risk storage technology compared to lithium-ion systems. The plant contributes to grid stability and supports the integration of renewable energy sources in the region.

Pumped hydro storage facilities like AES ES GILBERT are generally considered low-risk for thermal runaway compared to lithium-ion systems. However, siting near populated areas requires careful management of water resources and potential impacts on local ecosystems. In arid regions like Arizona, water conservation is critical, and operators must comply with state water use regulations. The facility's grid interconnection role supports renewable energy integration, reducing reliance on fossil fuels.