The VRB-ESS serves as a buffer between a variable supply sources and the firm requirements of a power contract and can add capacity value to non-firm resources such as wind and Photo-voltaic (PV). Wind generation systems have a fluctuating power output due to the variability of the wind speed. A one to one response time makes the VRB-ESS capable of charging and discharging over the same duration and can provide stabilization of wind turbine output and is a source of reactive energy. Additionally, voltage can be regulated and in off grid networks, system frequency can be controlled.

Economically, the consequence of unknown power output is a reduction in the capacity payment or capital credit of fluctuating power generation. Applying the VRB-ESS in conjunction with a wind generator removes the fluctuations and can provide a "firm" supply to the utility. This in turn increases the price of capacity to the wind generator.

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