Chicago, May 2, 2012 — S&C Electric Co. completed an energy storage project at the Santa Rita Jail in Dublin, Calif.
The new energy storage solution features S&C‘s PureWave Storage Management System and helps integrate on-site renewable energy sources and storage at the facility. The battery storage capabilities enable the jail to purchase power during non-peak hours from the local utility and store the reserves — a process that will end up saving the jail nearly $100,000 dollars per year.
The energy storage system is a key component of the jail’s smart microgrid that was engineered and built by Chevron Energy Solutions. The microgrid serves a correctional facility that covers 113 acres and combines solar, wind, and fuel cell energy sources, along with emergency diesel backup, to generate electricity for the facility, which uses 3 MW of electricity daily.
During times when the facility is islanded from the local utility grid, the energy storage system balances the microgrid’s load with the total power generated from on-site sources by automatically and instantly storing any energy generated in excess of the load requirements. The energy storage system also supplies electricity if demand exceeds what the onsite generation sources are generating.
To add the needed energy balancing to the microgrid, S&C provided a 2-MW PureWave Storage Management System to control the charging and discharging of lithium-ion batteries.
The energy storage system assures that these intermittent and diverse green energy sources will provide reliable and stable generation for the jail for up to eight hours until utility power is restored or back-up diesel generators are brought online.
S&C’s PureWave SMS features advanced control algorithms that allow the SMS to automatically pick up or shed load for the various generation sources without a system-level master control, which would add cost and complexity. The stored energy system also allows the facility to charge the batteries when electricity is inexpensive, and use them to supply electricity during peak hours when costs are high.