Imagine Jakarta with fewer engines, Bangkok beneath clearer skies and Manila moving through reliable electric transport. Zero Emissions Day, observed on September 21 under the call to “Give our planet one day off a year,” invites Southeast Asia to consider how such moments could become everyday reality.
Context: One Day, A Much Longer Transition
A complete 24-hour pause in fossil-fuel consumption is unrealistic for a region of more than 680 million people. Hospitals, public transportation, businesses and essential services must continue operating. The day’s value therefore lies less in temporarily switching everything off than in making emissions visible.
Residents can choose trains, buses, bicycles or walking; offices can reduce unnecessary cooling and lighting; and businesses can examine where their electricity and transport fuels originate. These individual actions will not replace national policy, but they can turn an abstract climate target into a practical public conversation.
Carbon: Growth Still Runs on Fossil Fuels
Southeast Asia’s energy demand is approximately 40 percent higher than it was in 2015. According to the International Energy Agency’s Southeast Asia Energy Outlook 2026, fossil fuels supplied most of that increase. Coal demand grew by an average of 8 percent annually, raising its share of the regional energy mix from 20 percent in 2015 to about 30 percent.
In 2023, coal generated half of Southeast Asia’s electricity and accounted for approximately 80 percent of power-sector emissions. Its consequences reach beyond climate change: the IEA estimates that air pollution associated with coal use contributed to around 330,000 premature deaths across the region in 2024.
Emissions also come from congested roads, industrial expansion, forest loss, peatland fires and increasing demand for air conditioning. Tropical heat makes cooling essential, but inefficient buildings and appliances can lock cities into higher electricity consumption for decades.
Change: Clean Investment Is Gaining Ground
Southeast Asia’s transition is no longer defined only by future promises. Clean-energy investment reached approximately US$47 billion in 2025, approaching the US$50 billion invested in fossil fuels. Solar and wind generation have expanded by around 35 percent annually, although they began from a comparatively small base.
Vietnam’s rapid solar development demonstrated how quickly capacity can grow when policy and investment align. Indonesia possesses major geothermal potential and is expanding solar projects, while the Philippines is developing renewable-energy zones and offshore wind plans. Singapore is testing regional electricity trading and importing low-carbon power through neighbouring countries.
The ASEAN Power Grid could allow countries to share renewable electricity across borders, balancing hydropower, solar, wind and geothermal resources. Greater interconnection would also reduce exposure to unstable international fuel prices.
For Indonesian energy specialist Fabby Tumiwa, the economic argument is clear: “The energy transition is a necessity if Indonesia is to achieve sustainable growth.”
Communities: A Transition People Can Support
Zero emissions cannot be delivered through power stations alone. Jakarta, Bangkok, Kuala Lumpur and Manila need dependable public transport, safer walking routes and infrastructure for electric vehicles. With motorcycles central to mobility in many ASEAN cities, electrification must remain affordable for drivers and small businesses.
Energy efficiency offers an immediate opportunity. Better building design, efficient air conditioners and district-cooling systems can lower demand without reducing comfort. Dr Andy Tirta of the ASEAN Centre for Energy has called energy efficiency “the lowest hanging fruit,” highlighting its ability to reduce costs and emissions while new renewable capacity is developed.
Communities dependent on coal mining, fossil-fuel industries or carbon-intensive agriculture must also be included. Retraining, social protection and local economic planning can ensure that workers are not expected to carry the cost of national climate commitments.
Forests, mangroves and peatlands remain equally important. Protecting them prevents emissions while supporting fisheries, biodiversity and coastal resilience. Indigenous peoples and local communities should participate directly in decisions concerning the landscapes they manage.
Course: Turning Awareness into Everyday Practice
September 21 can serve as a regional testing ground. Cities can introduce car-free zones, companies can measure operational emissions, schools can conduct energy audits and households can reduce avoidable electricity use. The most useful initiatives will record their results and continue beyond a single day.
Governments must match public participation with faster renewable-energy approvals, modern electricity grids, efficient buildings and credible plans for retiring high-emitting facilities. Financial institutions can support the transition by directing affordable capital toward clean energy and community enterprises.
Zero Emissions Day offers Southeast Asia a moment to pause without slowing its aspirations. The region’s cleaner future will not be created by one silent day, but that day can help millions imagine—and begin building—a healthier, more secure and less carbon-intensive decade.
