Grid scale BESS can be used for frequency regulation, peak shaving (i.e. reducing demand during peak hours to lower grid stress or avoid high tariffs) and grid stability. The 750 kW BESS project at the PECC2 Innovation Hub in Ho Chi Minh City is an example of this.
[pdf] The project, the first one in the country utilizing the PowerTitan 2.0, is set to begin construction this month and will mark a new phase of energy storage development in the region, strengthening grid stability and optimizing renewable energy integration.
[pdf] System Scale: Think “bigger is cheaper”—sort of. A 100 MWh system might cost $400/kWh, while smaller 10 MWh setups hover around $600/kWh. Infrastructure & Installation: Pumps, tanks, and inverters aren’t free, folks. Site prep can add 15-20% to your bill.
[pdf] 
