Depth of Discharge (DoD): It is the percentage of energy discharged from the BESS out of the total energy storing capacity. Lower DoD can ensure higher cycle life of the BESS. Generally, the maximum DoD is set at 90% for BESS.
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Specifically, lithium-ion systems typically range from $400 to $600 per kilowatt-hour, while flow batteries can cost between $700 and $1,200 per kilowatt-hour. They're scalable, long-lasting, and offer the potential for cheaper, more efficient energy storage.
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The global solar energy storage battery market size was valued at USD 6. 39 billion in 2025 and is projected to grow from USD 7. 93 % during the forecast period.
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The largest is on Jurong Island, with more than 800 large-scale battery units across 2ha of land installed by Sembcorp Industries in 2023. With a capacity of 285MWh, the storage system can, in a single discharge, meet the electricity needs of around 24,000 four-room HDB.
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