Sacramento Municipal Utility District (SMUD) is piloting both residential energy storage (RES) units and community energy storage (CES) systems in Anatolia. So far, the research team has installed 15 RES units in the garages of neighborhood volunteers. Later this month, the team will set up three CES systems in the neighborhood. Each CES will be connected to the pad-mounted transformers on distribution feeders and will be sized to work with the group of homes serviced by each transformer. These are about three times larger than the residential units, but can be shared between five to ten homes.

SMUD will continue to run tests and gather data through September 2012, giving the utility a nine-month experimental period with the RES units and roughly a six-month period for the CES units. Although complete results will not be available until the end of the year, the researchers will present preliminary data on March 19, 2012, at the PV America conference in San Jose, California.

Technical Details
3 CES installations, each consisting of two 15 kW CES units in a common enclosure
Each CES installation provides 30 kW of capacity with 30 kWh of usable energy storage from SAFT Li-Ion batteries
Each CES installation is connected to the secondary of a 50 kVA pad mount transformer feeding approximately 9-12 homes
They will be operated to help answer critical questions related to reliability, system architecture optimization, operational control
The CES systems can be coordinated, in an aggregated fashion, as a single utility asset testing larger scale integration concepts
The CES is monitored/controlled via a wireless communications interface which will report critical inverter and battery status.

Note: Funding designation is half designated to High Penetration Solar Pilot Project Anatolia (RES System)

Lithium-ion Battery