Giant Storage Batteries Help San Diego County Water Authority Cut Costs

The San Diego County Water Authority will save approximately $100,000 annually with commercial-scale storage batteries recently installed at the agency’s Twin Oaks Valley Water Treatment Plant near San Marcos. The energy storage system is designed to reduce operational expense at the facility by storing low-cost electricity for use during high-demand periods when energy prices increase. The batteries were installed at no charge as part of an agreement with Santa Clara-based ENGIE Storage. The system charges from either the electric grid at times when rates are low, or from some 4,800 solar panels at the treatment plant.