Why Subsea Power Cable Projects Need Governance

Subsea Power Cable Projects across Southeast Asia represent a massive technical and economic opportunity, but their success hinges on a factor that cannot be manufactured in a factory. It's governance. And while the engineering feasibility of connecting the region's electricity grids has been established for years, the real challenge has shifted from physical technology to institutional design so the frameworks governing these massive cross-border connections must mature at the same rate as the scale of regional energy integration expands.

The ASEAN Interconnection Masterplan Study III highlights the sheer scale of the coming expansion. It's huge. It identifies 18 new and existing interconnectors, and these links are projected to more than double the region's current interconnector capacity of 7.7 gigawatts by the year 2040, so meeting this target requires translating political promises into concrete, day-to-day mechanisms for project development. But that's a big challenge.

The Shift from Technology to Institutions

Building physical infrastructure under the ocean is no longer the primary obstacle for regional integration. It's not. Modern engineering can reliably deploy high-voltage lines across deep maritime trenches, but managing the electricity that flows through them requires unprecedented political and administrative alignment.

The challenge of cross-border subsea interconnection in ASEAN is increasingly institutional rather than purely technical. Getting this right would deliver broad benefits across ASEAN by strengthening energy security, improving access to diverse and lower-cost energy resources, enabling cross-border trade, and supporting a more coordinated transition toward low-carbon growth. It's a big opportunity.

, Alnie Demoral, Energy Analyst at Ember

Geography explains why this shift is so urgent. It's a simple fact. Southeast Asia holds vast green energy potential, but these resources are located far from major demand centers, creating a logistical and economic challenge that demands immediate attention because hydropower sits concentrated in the Mekong subregion, solar capacity is expanding rapidly in specific zones, and offshore wind potential is concentrated along windy coastlines. So physical cables can bridge these geographic gaps, allowing nations to cut down on expensive fossil fuel imports and lower overall system costs.

Lessons from Europe's Existing Grid

Europe proves it. By 2025, the continent had roughly 25 operational submarine power interconnectors with a combined capacity of about 22,290 megawatts, and these connections generate massive commercial trading value. That brings in approximately 375 million euros per year. But it's higher, around 500 million euros annually, when you factor in forward trading, capacity value, and ancillary services.

But those networks didn't appear overnight. European frameworks needed decades of gradual policy changes and institutional adaptation to function properly, and they still demand continuous effort to manage rising complexity. So the critical lesson is clear. Success requires adaptive organizations.

Three Major Gaps in Southeast Asian Planning

To replicate this success, regional planning must evolve. Right now, three major gaps stand in the way of smooth project execution:

• System-wide Planning: Current frameworks help identify initial opportunities, but lack the strength needed to sequence and prioritize massive investments effectively.
• Cost Allocation: Without a shared analytical framework to calculate benefits, countries face slow, project-by-project negotiations to decide who pays for what.
• Maritime Coordination: Cables cross territorial waters and busy shipping lanes, requiring complex coordination between environmental, maritime, and energy authorities.

The High Cost of Slow Negotiations

Consider the proposed Brunei Darussalam-Indonesia-Malaysia-Philippines Power Integration Project. But without an agreed method for sharing costs and benefits, projects like this face prolonged negotiations that drag on and on, and every delay raises transaction costs while pushing completion dates further into the future. It's a costly cycle.

Building on Existing Foundations

Southeast Asia isn't starting from scratch. But the region already has established organizational pillars to build upon, such as the ASEAN Centre for Energy, HAPUA, and the APGCC, and political commitment was renewed when the enhanced ASEAN Power Grid Memorandum of Understanding was signed in 2025.

And that's the real challenge. Felix William "Wimpy" B. Fuentebella, Philippine Chair and SOE Leader, pointed out that the success of these initiatives depends on balanced development across multiple areas. But he also noted that the regional energy transition relies as much on regulation, finance, and maritime governance as it does on technical capacity, and it's a complex interplay that can't be overlooked.

We can't afford to wait. The immediate priority is simple: make the ASEAN Power Grid Generation and Transmission Planning function fully operational. By establishing structured methodologies for cost-benefit analysis and forming a dedicated submarine cable working group, the region can turn its ambitious 2040 transmission targets into reality. But here's the catch. Subsea Power Cable Projects will only succeed if the legal and regulatory frameworks on land can match the speed of the electricity flowing beneath the sea.