The components of an ARES Energy Storage System may also be deployed to create a robust Ancillary Services system which functions as a LESR (Limited Energy Storage Resource). These systems provide grid-scale including Regulation-Up, Regulation-Down, Spinning Reserves, VAR Support and Grid Inertia. The ARES Fast Response Ancillary Service technology bridges the power gap between large scale battery and flywheel installations and far larger pumped-storage hydro -- at a lower life-cycle cost than batteries, a higher energy-to-power ratio than flywheels and a greater efficiency and far faster ramp-rate than pumped-storage.
The ARES Ancillary Service facilities typically utilizes a single uphill track with a central queue of loaded shuttle-trains that travel up and down grade in response to an ISO (Independent System Operator) command to provide Reg-UP or Reg-Down frequency adjustment. In addition to its high charge / discharge efficiency of 86% it has extremely fast ramp-rate on the order of seconds to ramp to full power.
ARES rail based energy storage systems are covered by one or more of the following US patents: 8593012, 8674541 with foreign patents pending and issued.