ASEAN Renewables Are Far More Resilient to Climate Shocks Than Fossil Fuels, Report Finds

Ember's Resilience Findings for ASEAN Power Systems

A new report from energy think tank Ember finds that distributed renewable energy systems, paired with battery storage and strong grid interconnections, are far more resilient to climate shocks than the centralized fossil fuel plants that still dominate Southeast Asia’s power supply. The analysis covers the ten members of the Association of Southeast Asian Nations (ASEAN), a region that faces frequent earthquakes, typhoons and flooding alongside rising temperatures.

Ember’s modelling shows that even under the most extreme weather scenarios projected for 2030, ASEAN’s wind and solar generation will vary by less than 1% from normal output. That is significantly smaller than the output losses that thermal and nuclear plants are expected to suffer under milder warming conditions. Currently, around 64% of ASEAN’s installed power capacity still comes from fossil fuels, leaving grids exposed to disruption in one of the world’s most disaster-prone areas.

“ASEAN has witnessed a sweeping account of natural disasters. Power system resilience is central to a supportive ecosystem to unlock the potential of the green economy,” said Dr Dinita Setyawati, Senior Energy Analyst for Asia at Ember. The report distinguishes between two threats: chronic climate stress that gradually saps output, and acute disaster shocks that can destroy generation and transmission infrastructure outright. Distributed renewable networks, it argues, handle both better because damage can be isolated and repaired without blacking out the whole system.

Three case studies underline the point. In Central Sulawesi, Indonesia, a 7.4-magnitude earthquake in 2018 knocked out the Panau coal plant and forced the rehabilitation of 1,192 distribution units, yet the province still plans 2.25 gigawatts of additional coal capacity by 2030. Ember calculates that 600 megawatts of solar plus 720 megawatt-hours of battery storage could replace 250 MW of that coal and cut 1.4 terawatt-hours of coal generation while being quicker to deploy and easier to repair. In the Philippines, the isolated, diesel-dependent grid of Catanduanes province has suffered repeated outages after typhoons; a planned 58 megavolt-ampere interconnection with the main Luzon grid could supply up to 22% of the island’s electricity by 2030, speeding recovery. Viet Nam, meanwhile, lost about 405 gigawatt-hours of potential solar output in 2020—costing roughly US$26 million—because of limited grid flexibility and a lack of storage.

Why Distributed Solar and Wind Are Gaining Ground in Southeast Asia's Energy Planning

The Ember report shifts the debate in ASEAN from decarbonisation alone to a dual mandate of carbon reduction and physical security. Its core insight—that distributed renewables with storage and interconnection fare better under both chronic stress and acute shocks—has direct implications for how regional governments allocate billions of dollars in power investment.

The Resilience Case for Distributed Renewables in ASEAN

The low output variability of solar and wind under extreme climate scenarios challenges the long-held assumption that thermal plants are more reliable during crises. Ember’s findings suggest the opposite: fossil fuel and nuclear plants face larger percentage losses because they depend on continuous fuel supply chains and cooling water, both of which can be disrupted by floods, heatwaves or seismic events. Distributed renewable generation, by contrast, is less exposed to single-point failures. The analysis strengthens the argument that resilience planning should be embedded in ASEAN’s national power development plans, not treated as an afterthought.

Central Sulawesi and the Philippines: How Clean Energy Can Outperform Coal and Diesel

The Central Sulawesi example is especially striking because it illustrates a real-world miss. After a devastating earthquake crippled a coal plant, the province’s official energy roadmap still leans heavily on more coal. Ember’s alternative—solar plus storage that is quicker to build and repair—directly challenges that logic. In Catanduanes, the planned interconnection could slash diesel dependency and provide a lifeline during typhoons. Together, these cases demonstrate that the unit-cost advantage of renewables is now matched by a resilience advantage, a combination that could accelerate coal-to-clean transitions in disaster-prone islands and provinces across the region.

Vietnam’s Curtailment Costs Highlight the Growing Price of Grid Inertia

The US$26 million in solar curtailment losses in 2020 is a tangible price tag on grid inflexibility. Ember’s call for smart grids, battery storage and upgraded transmission is not just about capturing more renewable energy but about building in the flexibility that keeps the lights on after a shock. With Vietnam ramping up its solar capacity, the opportunity cost of failing to modernize the grid will only grow. The report essentially argues that ASEAN countries that ignore grid investments are paying a resilience premium—and that premium will rise as climate extremes intensify.

What ASEAN Policymakers and Investors Should Do Next

• Embed resilience in power planning. ASEAN governments should integrate climate and disaster resilience metrics into their national electricity development plans, as recommended by Ember, rather than relying on least-cost generation models that ignore physical risk.
• Replace planned coal with solar-plus-storage in Central Sulawesi. The Indonesian province’s 2.25 GW coal pipeline could be partially offset by 600 MW of solar and 720 MWh of storage, improving recovery times after earthquakes. Provincial authorities should commission a feasibility study for that switch.
• Accelerate the Catanduanes interconnection. The planned 58 MVA link to Luzon, if fully funded and built, would provide up to 22% of the island’s electricity demand by 2030 and sharply reduce reliance on diesel generators during typhoons. Philippine energy planners should prioritize this project.
• Invest in grid flexibility in Vietnam. To avoid future curtailment losses like the US$26 million hit in 2020, Vietnam needs smart grid technologies and storage deployed alongside new solar capacity. State utility EVN and private developers can start with pilot battery projects at high-solar-penetration sites.
• Use AADMER to align energy and disaster policy. The ASEAN Agreement on Disaster Management and Emergency Response provides a framework for regional cooperation on resilient energy systems. Member states should task the ASEAN Centre for Energy with developing a joint resilience roadmap that ties together renewable deployment targets and disaster preparedness.