San Diego County Water Authority is seeking proposals for a potential 500MW joint pumped storage project at San Vicente Reservoir with the City of San Diego. The potential project is expected to not only increase renewables penetration, but can also lessen pressure on water rates throughout the region by using existing infrastructure. The project would consist of closed-loop interconnection and pumping system between the existing reservoir and a new smaller reservoir located uphill. With a potential to produce 500MW of renewable energy, water from the downhill can be pumped uphill during off-peak times.