Jurong Island's 200 MW battery system excluded from power reserves

The facility can discharge for one hour at its maximum power output.

Jurong Island's 200-megawatt battery energy storage system (BESS) is excluded from Singapore's required electricity reserve margin due to its limited discharge duration, according to Minister for Energy, Trade and Industry Tan See Leng.

Tan said in a parliamentary reply on 6 October that the system can discharge for approximately one hour at its maximum power output.

"It is deployed to support grid stability over a shorter duration,” he added.

Meanwhile, generating units, such as conventional power plants, count towards the required reserve margin (RRM), as they can mitigate prolonged outages of generation capacity.

Singapore's Energy Market Authority (EMA) currently requires installed generating capacity to be at least 27% above peak electricity demand under its RRM framework.

This corresponds to a planning standard of no more than three loss of load hours (LOLH) annually, accounting for planned and unplanned prolonged outages, including emergency maintenance and repairs.

Tan said that over the past five years, the actual reserve margin ranged from approximately 35% to 49%, exceeding the 27% requirement, with zero recorded LOLH.

The EMA is evaluating how battery storage systems could be incorporated into future electricity generation planning as technologies improve and costs decline.

“This includes how to incorporate BESS in future generation planning assumptions as well as studying whether enhancements to infrastructure processes and market frameworks are needed,” Tan added.

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