Distributed Energy Resources (DER), including energy storage, are proliferating on cooperative systems thanks to cost declines, performance improvements, consumer-member expectations, and the digitization of metering. Battery energy storage systems (BESS) have seen steep cost declines in recent years, and total capacity is expected to grow significantly in the near future. This advisory reviews the importance for co-ops to consider the various value streams of a BESS application when determining DER / Energy Storage compensation.