Electric Membership Corporation, Statesville, NC, USA

The BESS at Crescent EMC was originally installed for test purposes at the Battery Energy Storage Test (BEST) facility in New Jersey and underwent some cycling there, perhaps the equivalent of 200 cycles. At Crescent, it is cycled to reduce the demand whenever there is a possibility that Duke Energy will experience their 

The battery consists of a single string of 324 cells configured six cells per module. These are flooded, deep-cycle cells with lead-antimony grids and were manufactured by GNB, Inc (now Exide). The battery is rated at 500, 300, and 200 kW at the Ci/1, C2/2 and C3/3 rates, respectively. When the battery was transferred to Crescent, its measured capacity was in excess of 2200 Ah. It was warranted at that time for 2000 cycles, or eight years, and has far exceeded that expectation. 

After 15 years of service at Crescent, the BESS continues its peak-shaving duty although the battery capacity is somewhat diminished. There is not definite information on the total number of cycles that the battery has experienced. The automated system fimctions so routinely that Crescent tends to forget it is there . 

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