ETT Presidio NaS Battery - 4 MW Pumped Hydro Storage Facility in Texas, USA

ETT Presidio NaS Battery is a pumped hydro storage facility located in Texas, United States, with a capacity of 4 MW. Owned by Electric Transmission Texas LLC, the plant is operational and contributes to the state's energy storage infrastructure. While pumped hydro storage is traditionally large-scale, this facility's capacity places it in the small-scale category, typical for localized grid support. The facility operates under U.S. regulatory frameworks including NFPA 855 for energy storage system safety and UL 9540/9540A for battery system testing. These standards ensure safe operation, particularly regarding thermal runaway risks associated with lithium-ion chemistries, though the plant's pumped hydro technology inherently has lower thermal risk. The plant's grid interconnection role likely focuses on peak shaving and frequency response, common for storage in Texas's ERCOT market. Environmentally, the facility's location in Texas provides benefits such as reducing reliance on fossil fuel peaker plants and enhancing grid resilience. Its small scale minimizes land use impact, and pumped hydro storage offers long-duration energy storage with minimal chemical hazards. The plant supports renewable energy integration by storing excess generation from wind and solar sources in the region.

The facility is located in Texas, a state with high renewable energy penetration, particularly wind and solar. Energy storage like pumped hydro helps mitigate intermittency and reduces the need for fossil fuel backup. The site's remote location minimizes risk to populated areas, and pumped hydro technology avoids thermal runaway risks associated with lithium-ion batteries. Proper siting and adherence to NFPA 855 ensure safety and environmental compatibility.