This project had a kick-off meeting in August 2020. The team is in the design phase and also conducted their first technical advisory meeting in Fall 2020.
A groundwater storage facility will be developed for the demonstration. Groundwater will be used to fill and drain a small surface reservoir. An existing well with 150 kW (200 HP) nameplate capacity will be retrofitted to also act as generator. At 35% generation efficiency, the well will produce 52.5 kW of power. The technology is behind-the-meter and will require a Net Energy Metering (NEM) interconnection agreement with SCE. For the demonstration, the stored energy will be discharged to provide on-peak power to SCE during the evening ramp up and recharged off-peak. [br /]
The facility will be operated for one year to demonstrate that up to 25-hour discharges can be produced reliably. The regeneration well will be operated to provide 50 kW of energy discharge using local groundwater. They will also be operated with imported water to show 100+ hour energy discharge during simulated PSPS outages. The test well will be used to demonstrate both the two-way groundwater dependent aquifer pumped hydro, as well as the one-way configuration that stores energy when imported water is available.
Aquifer pumped hydro is estimated to cost less than a lithium ion battery ($380/kWh versus $470/kWh for the battery) which can lead to lower costs for energy storage and eventually translate to bill savings. This is because it relies on existing infrastructure and proven technology. It uses durable water wells that have a long lifecycle.
The 25-hour discharge duration can provide peak power during the evening ramp up five days in a row, increasing electric reliability. It can also absorb surplus renewables during the spring period of renewables overgeneration risk.
Key Project Members
Rosamond Community Services District
HDR Engineering, Inc
Water and Energy Consulting AZ
Kern County County Administrative Office
Antelope Valley Water Storage, LLC