Financing Emerges as a Key Barrier to Southeast Asia’s Energy Transition

October 7, 2026-Southeast Asia’s energy transition is facing a growing financing challenge, as investment in large-scale renewable energy projects continues while smaller solar installations, battery storage systems and power transmission infrastructure struggle to attract sufficient capital.

In a report titled Bankable by Design: Financing ASEAN’s Energy System Transformation, published on October 7, 2026, energy think tank Ember argues that the region’s main challenge is shifting from raising capital to making clean energy projects commercially viable and attractive to investors.

Over the past decade, Southeast Asia’s installed solar capacity has increased to 39 GW, while wind capacity has reached 9.6 GW. However, the region’s next phase of energy development will require more than additional renewable generation. Distributed solar, battery storage and transmission infrastructure will be essential to integrate variable renewable power, strengthen grid reliability and meet rising electricity demand.

Energy storage investment remains significantly below regional needs. ASEAN is estimated to require 23–26 GW of energy storage capacity by 2030, yet only around 7 GW of projects have been publicly announced. The gap highlights the need for financing structures and market rules that enable storage systems to generate predictable revenues.

Ember identifies project scale as a major factor influencing investment returns. Under the report’s modelled assumptions, a 20 MWp solar project could generate an equity return of 13.2% at a 7% financing interest rate. To achieve a 12% return, the project would require an electricity tariff of approximately US$72/MWh.

Smaller projects face greater financial challenges because development and transaction costs account for a larger share of their overall investment. Reducing borrowing costs alone may not be enough to make these projects attractive to investors.

Battery storage faces a related problem. Although storage can provide flexibility, balancing and other grid services, many ASEAN markets lack comprehensive mechanisms to compensate storage operators for these services. Without predictable and diversified revenue streams, projects may struggle to secure financing.

Transmission infrastructure presents another obstacle. Ember estimates that equity returns for certain transmission projects fall between 7.2% and 8.8%, below the 12% return benchmark used in its analysis. While grid infrastructure supports renewable energy integration and improves energy security, investors may be unable to capture the full economic value these assets create for the wider electricity system.

To address these challenges, Ember highlights the importance of clearer power purchase agreements, lower transaction costs, aggregated financing structures for smaller projects and market mechanisms that allow battery storage to earn revenue from multiple services.

The implications extend across Southeast Asia. As countries pursue renewable energy targets and respond to growing electricity demand, the ability to attract investment into distributed generation, storage and grid infrastructure will increasingly shape the pace and reliability of the energy transition.

Ultimately, financing the next stage of ASEAN’s clean energy transition will require more than access to capital. Governments and market participants must create stable regulatory frameworks, predictable revenue models and investment structures suited to the needs of different technologies and project sizes.