At this size, it is likely acting as a grid stabilizer rather than any kind of backup. Even 'drop in the bucket' size batteries can have a very positive impact

At this size, it is likely acting as a grid stabilizer rather than any kind of backup. Even 'drop in the bucket' size batteries can have a very positive impact on a grid when used in this way that bring down costs for network operators, and increase allowable renewable generation on the network. They can do this because of their response times being in the millisecond range, rather than seconds/minutes for hydro(15+ seconds) and other generation types. Eg, Tesla battery in South Australia mainly saves the operator money this way [0]. [0] https://www.pv-magazine.com/2018/12/05/south-australias-tesla-big-battery-saves-40-million-in-grid-stabilization-costs/ https://www.pv-magazine.com/2018/12/05/south-australias-tesl...