Southeast Asia requires 18 new or expanded subsea power interconnectors by 2040 to meet regional energy demands, according to a recent analysis by Ember. While the ASEAN Interconnection Masterplan Study III provides a roadmap to more than double existing 7.7-gigawatt capacity, analysts warn that current institutional and governance gaps—rather than technical limitations—pose the primary barrier to project completion.
Why is institutional alignment stalling subsea power grids?
The transition from a domestic energy focus to a regional ASEAN Power Grid hinges on resolving three specific governance bottlenecks, according to Ember energy analyst Alnie Demoral. First, the region lacks a centralized mechanism to sequence and prioritize infrastructure investments across borders. Second, there is no shared framework for cost allocation, often leading to stalled negotiations when benefits are unevenly distributed between exporting and importing nations. Third, maritime governance remains fragmented; subsea cables must navigate complex territorial waters, exclusive economic zones, and existing telecommunications or fishing infrastructure, which currently requires cumbersome coordination across multiple national authorities.
Europe’s interconnected grid, often cited as a benchmark for this project, currently operates approximately 25 submarine interconnectors with a combined capacity of 22,290 megawatts as of 2025.
How does ASEAN’s current strategy compare to global standards?
ASEAN’s current planning framework provides a foundational start but lacks the operational teeth of more mature regional grids. While the ASEAN Interconnection Masterplan Study III identifies the necessary hardware, it does not yet dictate the “software”—the regulatory and operational mechanisms—required to manage these links. Philippine Undersecretary Felix William “Wimpy” B. Fuentebella noted that while the region possesses the necessary foundations, success depends on moving from high-level master planning to specific, actionable transmission planning functions. Unlike European models, which have had decades to refine cross-border energy markets, ASEAN must now accelerate the development of a submarine cable working group to harmonize these diverse regulatory environments.
Pro Tip: Look for Regulatory Harmonization
Investors and stakeholders should monitor the operationalization of the ASEAN Power Grid’s transmission planning function. Projects that align with a unified regional cost-benefit methodology are significantly more likely to secure financing than those relying on bilateral, ad-hoc agreements.
What happens next for regional energy integration?
The path forward requires a shift toward institutionalizing regional cooperation. Ember recommends that ASEAN prioritize the creation of a dedicated submarine cable working group to address maritime governance issues before physical construction begins on the 18 identified interconnectors. By establishing clear protocols for territorial navigation and maintenance early, the region can avoid the cost-overruns and delays that often plague multi-jurisdictional infrastructure projects. Without these frameworks, the technical ability to transmit electricity will remain sidelined by the difficulty of managing the sea floor and the legal rights of participating nations.
Frequently Asked Questions
- What is the main goal of the ASEAN Power Grid? The goal is to scale cross-border electricity links to support energy security, aiming to significantly exceed the current 7.7-gigawatt capacity by 2040.
- Why are subsea cables difficult to manage? They cross multiple jurisdictions, including exclusive economic zones and areas used for commercial shipping or telecommunications, requiring complex multi-authority coordination.
- Who identifies the needed interconnectors? The ASEAN Interconnection Masterplan Study III identifies the 18 specific projects required to meet the region’s 2040 energy targets.
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