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Renewables can feasibly meet SE Asia power demand: IEA

  • Spanish Market: Electricity
  • 23/09/25

Fossil fuel-reliant southeast Asia possesses vast and diverse renewable resource potential that can feasibly be harnessed to meet its booming electricity demand, Paris-based energy watchdog the International Energy Agency (IEA) said in its latest report.

Southeast Asia's power demand grew by more than 7pc in 2024, almost double the global average, according to the IEA's Integrating Solar and Wind in Southeast Asia report, published on 22 September. Countries in the region are still heavily reliant on coal and gas for power generation. Coal accounted for 47pc of the region's generation mix in 2024, and coal consumption during the year rose by almost 8pc. The region's gas-fired power generation is growing at just below 5 pc/yr.

But southeast Asia has significant potential to utilise a wide range of renewable energy sources such as solar, wind, hydropower, geothermal and biomass. Southeast Asia has the technical potential for 20TW of untapped variable renewable energy (VRE) — solar and wind power — which is about 55 times the region's current total generation capacity. Harnessing this could significantly reduce its dependence on fossil fuels.

Solar power generation has increased rapidly, and the increase has required more flexibility in power systems. Measures such as unlocking the flexibility of existing conventional power plants, improving forecasting systems, updating grid codes for renewable connections and modernising grid monitoring and control capability do not require significant investment or restructuring of power systems or markets, the report said.

Southeast Asia has significant untapped flexibility, with most of this currently coming from thermal and hydropower plants that can ramp up and down faster, as well as operate at lower minimum levels. But many of these plants are subject to long-term inflexible power purchase agreements and fuel supply contracts that are subject to take-or-pay obligations, forcing them to operate at fixed levels or purchase minimum fuel quantities regardless of system needs.

Cross-border collaboration

Greater interconnection across borders, such as through the Asean power grid, which encompasses projects like the Lao PDR-Thailand-Malaysia-Singapore power interconnection project, enhances efficiency and energy security at a regional scale.

Peak demand rarely occurs at the same time in countries across the region, the report said, adding that this allows for resources to be shared and reduces the necessity of standby generation. Variability could also be offset if there was a larger pool of generation facilities.

Cost has been a concern as rising grid costs could lead to higher electricity prices. Shared reserves, balancing supply and demand and flexibility resources would allow for the assets to be used more efficiently, which would reduce the need for expensive domestic flexibility investments, especially in storage and fossil fuel backup systems. Additionally, cross-border power trade would help countries access lower-cost renewables and shared infrastructure.

But regional co-ordination and strong governance frameworks are necessary to ensure costs and benefits are evenly distributed among the countries. Regulatory barriers should also be removed to encourage private sector investment in flexibility resources.


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