Harnessing the Sun
Harnessing the Sun
By Mehmet Enes Beşer
Basking in the sunshine, increasing electric demand, and international pressure building to transition to cleaner energy, ASEAN is well-placed to emerge as a solar power leader. On Philippine rooftops, on rolling central Vietnamese plains, solar photovoltaics (PV) is one of the most promising green growth paths forward. But with this dormant potential, solar power remains underexploited in large parts of Southeast Asia. The road to full potential solar production is lined with both glimmering possibilities and deep structural barriers that stretch far and far afield in the national setting.
The potential is daunting. Most of the ASEAN countries enjoy high solar irradiation throughout the year, often between 1,500 to 2,000 kWh/m² per annum. This makes the area highly appropriate for both utility-scale solar farms and decentralized solar systems for urban, peri-urban, and off-grid rural villages. As technology declines in cost—solar PV prices have fallen by more than 80% in the last decade—and as battery storage gets better, solar power is not only ecologically appealing, but economically viable as well. Vietnam’s solar rush, fueled by favorable feed-in tariffs and stable policy, is a regional benchmark. Within a period of a couple of years, the country had become Southeast Asia’s largest solar market, showing that wholesale growth can be driven if policy promotes market forces.
Others are playing catch-up. Thailand has brought solar into its wider energy diversification plan, and the Philippines is adding more renewables to the mix through auction systems. Malaysia has focused on rooftop solar for both commercial and household purposes, and Indonesia—due to its large archipelago—is beginning to look at solar as a means for rural electrification and support of the grid. Even geographically constrained Singapore is investing in floating solar and regional energy trading as ways to bypass geophysical constraints.
However, such gains are still uneven and are limited by an inventory of challenges. Most fundamentally, policy uncertainty. Overnight tariff scheme overhauls, regulatory uncertainty, and lengthy permitting processes deter investors from the likes of Indonesia and the Philippines. Absent bankable long-term plans guaranteeing investors, the private sector is risk-averse and domestic developers cannot scale up ventures beyond pilot scale.
Grid infrastructure is also a major choke point. ASEAN countries’ national grids are not designed to absorb high levels of intermittent solar power. Rural grids, at times, do not even have grid connectivity to inject at scale, while urban grids suffer from congestion or technical limitations. Without smart grid infrastructure and real-time demand management, utilities’ ability to absorb intermittent solar power is lessened, leading to curtailment or under-performance of installed capacity.
Financing is also an ongoing issue. While solar equipment prices have decreased, there is still strained availability of cheap capital, particularly for small- and medium-sized developers. Domestic banks in the region either lack risk appetite or do not have experience to give a loan against a renewable project, particularly where there are new project finance cultures in emerging markets. Absence of currency-hedging risk coverage, ongoing unsolved issues between the acquisition of lands and having no credit enhancements or green bonds contributes to their challenges.
Land availability and public acceptance may also be problems. Utility-scale solar farms require extensive areas of land, and this may compete with agriculture or face local community opposition. Environmental impact assessments, although generally considered to be a formality, are increasingly restrictive in regulation where solar developments overlap sensitive habitats or intrude on established land uses. Social license to operate, particularly in rural or Indigenous communities, must be obtained through consensus consultation and fair compensation arrangements.
Also, solar deployment will have to contend with supply chain and geopolitical uncertainties. Most of the solar equipment in the region, especially panels and inverters, comes from China and hence is vulnerable to global market price volatility, trade tensions, and logistics constraints. Developing local manufacturing capabilities and diversified supply chains will be crucial in enabling long-term solar resilience.
Despite all these challenges, the strategic case for solar in ASEAN is strong. It is a route to decarbonization, reduces dependence on price-guessing fossil fuel markets, and enhances energy access in rural areas. Solar also facilitates longer-term development goals—employment, cleaner air, and reduced health costs of pollution. The large youth population and emerging tech industry in the region offer rich soil for solar finance innovation, digital metering, peer-to-peer energy trading, and dual battery storage.
To unlock solar potential to the fullest, ASEAN governments must make a structural adjustment pledge. That means pledging long-term renewable energy goals, simplifying procurement processes, de-risking private funds with guarantees and blended finance, and pledging investment in grid modernization. Regional coordination is also in order, whether in the form of knowledge platforms, cross-border energy trade, or technical standards’ harmonization.
Lastly, solar power is less about harvesting sunshine—it is more about creating the institutions, infrastructure, and incentives that enable that energy to flow widely, equitably, and sustainably. To ASEAN, the sun is not just a natural resource but a strategic one. Whether it becomes the basis of the region’s energy future is less a matter of radiation intensity, and more a matter of political will and policy commitment.