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Load leveling is storing power during periods of light loading on the system and delivering it during periods of high demand. Load leveling also allows for the postponement of investments in grid upgrades or in new generating capacity.
Peak shaving is similar to load leveling, but mainly for the purpose of reducing peak demand rather than for economy of operation.
Commercial and industrial customers save on their electricity bills by reducing peak demand
The variable, intermittent power output from a renewable power generation plant, such as wind or solar, can be maintained at a committed level for a period of time. The energy storage system smoothens the output and controls the ramp rate (MW/min) to eliminate rapid voltage and power swings on the electrical grid.
Intermittent power generation from renewables and other sources, along with variable loads cause deviations from nominal frequency in the grid. Energy storage systems will restore the balance between supply and demand. The energy storage system is charged or discharged in response to an increase or decrease of grid frequency and keeps it within pre-set limits.
Energy storage systems improve power quality and protect downstream loads against disturbances in the grid, affecting their operation.
Respond to a generation or transmission outage by supplying power to maintain network continuity while the back-up generator is started and brought on line. This enables generators to work at optimum power output, without the need to keep idle capacity for spinning reserves. It can also eliminate the need to have back-up generators running idle.