Decarbonising Southeast Asia through solar and pumped hydro - East Asia Forum
Published March 28, 2026
Decarbonising Southeast Asia through Solar and Pumped Hydro
As Southeast Asia grapples with the urgent need to reduce greenhouse gas emissions, the region is increasingly turning towards renewable energy sources, particularly solar power and pumped hydroelectric storage. These technologies offer a promising pathway for decarbonisation, aligning with global climate goals and enhancing energy security.
The International Energy Agency (IEA) has identified that the energy sector is responsible for around 70% of greenhouse gas emissions in Southeast Asia. This statistic underscores the critical need for a transition to cleaner energy sources. The region's reliance on fossil fuels, particularly coal, has been a significant contributor to its carbon footprint. However, there is a growing recognition of the potential for renewable energy to play a transformative role in the energy landscape.
Solar Energy Potential
Southeast Asia is endowed with abundant solar energy resources, with several countries experiencing high levels of solar irradiation. For instance, countries like Thailand, Vietnam, and the Philippines have consistently recorded solar irradiation levels that are among the highest in the world. According to the IEA, the region has the potential to generate over 1,000 gigawatts (GW) of solar power by 2040 if investments and policies align effectively.
In recent years, various governments in Southeast Asia have initiated ambitious solar energy programs. Thailand has emerged as a leader in solar energy deployment, with over 3.5 GW of installed capacity as of 2020. The country’s Feed-in Tariff (FiT) scheme has incentivized private investment in solar projects, resulting in a significant increase in solar installations.
Vietnam has also made remarkable strides in solar energy, with installed capacity surging from just 1 GW in 2019 to over 16 GW by mid-2021. The Vietnamese government’s commitment to renewable energy is evident in its Power Development Plan, which aims to achieve 20% of total electricity generation from renewables by 2030.
Pumped Hydro Storage as a Complementary Technology
While solar energy provides a viable solution for generating clean electricity, its intermittent nature poses challenges for grid stability and reliability. This is where pumped hydro storage (PHS) comes into play. PHS is a mature technology that allows for the storage of excess energy generated during peak solar production hours. This stored energy can then be released during periods of high demand or low solar generation, thereby stabilizing the grid.
The IEA estimates that Southeast Asia has the potential to install up to 30 GW of pumped hydro storage capacity by 2040. Countries such as Malaysia and Indonesia are already exploring the development of pumped hydro projects to complement their growing renewable energy portfolios. For instance, Malaysia is advancing its plans for the 1,200 MW Ulu Jelai pumped hydro project, which will play a crucial role in balancing the grid as solar capacity increases.
Challenges to Implementation
Despite the significant potential for solar and pumped hydro technologies, several barriers must be addressed to facilitate their widespread adoption in Southeast Asia. One of the primary challenges is the need for substantial investment in infrastructure. The transition to renewable energy requires not only the installation of solar panels and pumped hydro facilities but also upgrades to existing grid systems to accommodate the influx of variable energy sources.
Additionally, regulatory frameworks in many Southeast Asian countries can be complex and may not adequately support the rapid deployment of renewable energy projects. Streamlining permitting processes and creating clear policies will be essential to attract private investment and facilitate project development.
Furthermore, there is a need for enhanced regional cooperation to optimize resource sharing and grid interconnections. Many countries in Southeast Asia have complementary energy profiles, which could be leveraged to create a more resilient and integrated energy system. Initiatives such as the ASEAN Power Grid aim to enhance connectivity between nations, allowing for the efficient exchange of electricity and enabling the region to better manage its energy resources.
Economic and Environmental Benefits
Transitioning to solar and pumped hydro technologies presents significant economic opportunities for Southeast Asia. The renewable energy sector is labor-intensive, creating jobs in manufacturing, installation, and maintenance. According to the IRENA, the renewable energy sector in Southeast Asia could create over 1.5 million jobs by 2030.
Moreover, investing in renewable energy can lead to energy independence, reducing reliance on imported fossil fuels and enhancing energy security. Countries that harness their local renewable resources can mitigate the risks associated with volatile fossil fuel markets and ensure a stable energy supply for their citizens.
From an environmental perspective, the shift to solar and pumped hydro technologies will contribute significantly to reducing greenhouse gas emissions. The IEA projects that a robust renewable energy strategy could help Southeast Asia reduce its emissions by up to 30% by 2040, aligning with global climate targets and commitments under the Paris Agreement.
Conclusion
Decarbonising Southeast Asia through solar and pumped hydro technologies represents a critical opportunity for the region to address its energy challenges while contributing to global climate goals. The abundant solar resources and the potential for pumped hydro storage can create a sustainable energy future, fostering economic growth and environmental stewardship.
As governments, private investors, and stakeholders work collaboratively to overcome existing barriers, the vision of a clean, renewable energy landscape in Southeast Asia can become a reality. The path forward will require strategic investments, supportive policies, and regional cooperation, but the potential rewards are significant for both the environment and the economy.
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