An exciting concept is emerging in San Diego County that could reduce pressure on water rates across the region and expand opportunities for renewable energy. The system under consideration is essentially an incredible “battery” that could store up to 500 megawatts of renewable energy. There’s still a lot of work to be done to determine whether this idea pencils out — but it’s important even at this early stage because it highlights how the San Diego County Water Authority and its member agencies are continually seeking ways to make the best use of the region’s water infrastructure.