Under some conditions, excess renewable energy is produced and, without storage, is curtailed 2, 3; under others, demand is greater than generation from renewables. Grid-scale energy-storage (GSES) systems are therefore needed to store excess renewable energy to be released on demand, when power generation is insufficient 4.
The integration of renewables in the grid can be supported by energy storage in various aspects, such as voltage control and the off-peak storage, and the rapid support of the demands. For these various roles, the corresponding sizing, operation, and lifetime requirements that the ESDs must comply with are shown in Table 7. Table 7.
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