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As Vietnam increases the share of renewable energy (RE) in its power mix, towards 28-36% by 2030 and 74-75% by 2050, grid stability becomes a critical challenge. Inverter-based RE sources such as solar and wind are variable by nature, meaning the power system needs firming capacity to ensure a reliable supply, especially during periods when RE generation is low. Long Duration Energy Storage (LDES), particularly Pumped Hydro Storage (PHS) and long-duration BESS (discharge continuously for 8 hours or more), plays a key role in enabling this. Without it, Vietnam risks curtailing clean energy, increasing reliance on fossil backup, and missing its energy transition goals.