Key Findings: Unlocking the Role of Utility-Scale Battery Energy Storage Systems in ASEAN

Developed by FESSIA in collaboration with DNV, this inaugural report explores how utility-scale Battery Energy Storage Systems (BESS) can strengthen grid flexibility, energy security, and renewable energy integration across ASEAN.

The report highlights commercially viable BESS opportunities, regulatory gaps, and the policy frameworks needed to unlock large-scale investment using the Philippines and Vietnam as key case studies.

Key Findings

- BESS is essential to ASEAN's energy transition, supporting more flexible, reliable, and renewable-ready power systems. - ASEAN's storage market remains underdeveloped, with only around 1.4 GW currently in operation.

- Policy clarity is now the biggest barrier, with stronger market frameworks needed to unlock investment.

- In the Philippines, BESS could reduce system costs by up to USD 275 million annually and unlock USD 2.25 billion in Solar + BESS revenues by 2030.

- In Vietnam, BESS investment potential could grow from USD 750 million in 2026 to USD 5.7 billion by 2030.

- Revenue stacking will be key to improving project bankability and maximising BESS value.

Download the Key Findings summary now.

The full report is currently undergoing peer review and will be available soon.