Ember, a London, UK-based energy think tank, has completed a new profitability analysis for solar projects in Southeast Asia. Integrating battery storage enhances reliability and significantly boosts project profitability across Indonesia, Viet Nam and the Philippines. The study found adding batteries increases project Internal Rates of Return by 1.2% to 9%. Indonesia demonstrated the strongest price signal for storage, boosting solar Internal Rate of Return (IRR)s up to 23% from the non-storage range of 11% to 16%. Project profitability is extremely sensitive to capital costs and PPA tariffs within Viet Nam, Indonesia, and the Philippines. A minimal 10 percentage point drop in capital expenditure can surge a project’s IRR by 18% to 41%. Ember has further noted that recent policy reforms are strengthening investor confidence and improving clean-energy deployment momentum.