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Hurricanes, made a mess of Puerto Rico's Electric system,
. . . but, as far as hurricane preparedness goes, the
. . . Dominican Republic beat the United States hands down.
2 battery systems, each had a discharge capacity of
. . . 10 MW, but with only the ability to discharge at that rate for
. . . 30 minutes. While that might not sound like much,
. . . the battery systems were the equivalent of a much larger capacity of thermal plants,
. . . because they could respond to changes in demand instantly,
. . . instead of having to ramp up and down.
The most violent period of Irma’s onslaught lasted
. . . 10 hours. During that time, the batteries went through heavy use,
. . . both discharging and charging at rates far higher than normal.
. . . As the power grid was being battered, somewhere between
. . . 40% and 55% of the thermal plants were forced offline.
. . . Meanwhile, the transmission authority ordered the AES batteries to keep working.
. . . They did so under remote control from one of Dominicana’s thermal plant control rooms, with an
. . . AES Energy Storage team monitoring them.

11-1-2017 Source:  #backup battery systems