The 8th ASEAN Energy Outlook found that full implementation of existing national energy efficiency plans could cut regional consumption by one-third against baseline projections. Progresses were made: energy intensity lowered by 24.5% from the 2005 baseline, and by 2023, renewable energy made up 14% of the primary supply. While significant progress has been made, the APAEC 2016–2025 targets of 32% energy intensity reduction and 23% RE share in TPES were not fully achieved, reinforcing the need to close the implementation gap as the region pursues the more ambitious targets of 40% energy intensity reduction and 30% renewable energy share in total energy supply under APAEC 2026–2030. Closing this gap is all the more urgent because ASEAN is set to become a net gas importer by 2027, meaning that every unit of demand that efficiency fails to eliminate is one more unit the region must source through supply chains beyond its control.
The evidence that efficiency pays is already within ASEAN. Malaysia’s National Energy Efficiency Action Plan (2016–2025) had delivered cumulative savings of 39,382 GWh, equivalent to RM 10.5 billion, by December 2023, at an annual savings rate of 5.9 per cent. The cost-benefit ratio stands at 3.2: every ringgit spent on the NEEAP returned RM 3.20 in electricity savings. Over the lifetime of the technologies adopted, the ratio rises to 7.4. The instruments behind these results—the MS 1525 building energy code, the Efficient Management of Electrical Energy Regulations, performance contracting for government buildings, and the promotion of 5-star rated appliances, are conventional, proven tools deployed within a coordinated national action plan. The Energy Efficiency and Conservation Act, enacted in 2024, now mandates that large consumers appoint energy managers, conduct regular audits, and report on their energy use, with an enforcement mechanism in place.
The international precedent tells the same story. Japan was hit by oil shocks in 1973 and 1979, and Tokyo's response was decisive. Heavy industries had to slash oil and electricity use by 10 to 20 per cent. The 1979 energy rationalisation law required every major facility to appoint a qualified energy manager, track consumption, and produce a reduction plan — with penalties for those that fell short. The Moonlight Programme put ¥130 billion into R&D on gas turbine efficiency, waste heat recovery, and heat pumps between 1978 and 1992. What came out the other side was an economy that looked completely different. Between 1973 and 2018, Japan's real GDP grew 2.6 times while final energy consumption rose just 1.2 times. Industry actually uses less energy today than it did in 1973 — 0.8 times the level, according to METI. The Top Runner Programme, which pegs efficiency standards to the best product already on the market, squeezed a 30 per cent improvement out of air conditioners alone. A crisis response from the 1970s became permanent institutional architecture, and it is a large part of why Japan remains one of the most energy-efficient economies in the world.
The Strait of Hormuz closure in early March 2026 exposed how ASEAN's energy efficiency implementation gap deepens the region's vulnerability to supply disruptions. Diesel prices in Lao PDR rose nearly 50 per cent in under a week. Cambodia recorded one of the steepest petroleum price increases worldwide. Petrochemical companies in Indonesia and Singapore declared force majeure. At least 85 countries reported fuel price increases, with Asia's disproportionate reliance on Hormuz-transited crude placing the region at the epicentre of the shock
AMS governments responded with emergency energy saving measures, as shown in the table below. As ACE’s media briefing on the Middle East situation documented, more than half of ASEAN’s crude oil imports originate from the region—principally from the United Arab Emirates, Saudi Arabia, and Kuwait—and over half of the region’s total final energy consumption depends on oil and gas.
Lao PDR: The Cost of Unhedged Oil Dependency
Of the eleven ASEAN member states, few illustrate the cost of unhedged oil dependency as sharply as Lao PDR. Unlike neighbours that activated immediate demand side measures, work schedule changes, driving restrictions, WFH mandates, Lao PDR's emergency response focused on medium term structural shifts: EV fee incentives, BRT expansion in Vientiane, and solar and biogas promotion for agriculture. The price exposure was stark: within just six days of the Strait of Hormuz closure, diesel surged from LAK 21,930 to LAK 32,860 — a jump far beyond the usual fluctuation range of LAK 80 to 300. With an EE&C Policy (2016), a Decree (2020), and EV adoption targets already in place, the most urgent task is to accelerate implementation before the next shock arrives.
Lao PDR's vulnerability runs deeper than oil import costs alone. As its EE&C-SSN focal point noted at the Technical Working Group meeting in Jakarta on 9–10 March 2026, most domestic hydropower output is exported under long-term contracts, leaving the country exposed to seasonal energy shortfalls. Energy efficiency therefore serves a dual purpose: reducing petroleum exposure and freeing up clean energy for both domestic use and export, strengthening Lao PDR's position within the ASEAN Power Grid.
Cambodia: Electric Mobility as a Structural Buffer
Cambodia recorded one of the steepest petroleum price increases globally between late February and 11 March 2026, with gasoline rising over 40 per cent and diesel significantly more. Yet the country had been building structural defences. The National Energy Efficiency Policy (2022–2030) targets a 19 per cent reduction in total energy consumption by 2030 and requires Designated Energy Consumers to appoint certified energy managers. The national EV policy aims for 30,000 electric cars and 720,000 e-motorcycles by 2030, with registrations rising from 5 in 2020 to over 4,300 by late 2024 and import duties on battery EVs cut roughly in half. At the EE&C Technical Working Group meeting in Jakarta on 10 March 2026, Cambodia's focal point reported that operating an EV costs approximately USD 2.35 per 100 kilometres, compared to USD 8.71 for a petrol or diesel vehicle, pre-crisis figures that strengthen the case further now that fuel prices have surged. No single measure offers an immediate buffer, but their combined effect gives the country progressively greater insulation against each successive shock
Policy Implications for the Region
The emergency measures documented above, four-day work weeks, WFH arrangements, and driving restrictions, are estimated to cut commuting and office building sector fuel consumption by around 20 per cent. Alongside these, accelerating the shift from LPG to efficient induction stoves and expanding public transportation would further reduce fuel imports and ease subsidy burdens. These immediate responses, however, must be underpinned by a structural foundation. Energy efficiency remains the lowest-cost, fastest-to-deploy option for reducing petroleum imports across all eleven Member States. Meanwhile, the ASEAN Framework Agreement on Petroleum Security has already been recognised as a medium and long-term strategic measure in line with the APAEC 2026–2030.
Medium to longer-term structural reforms including harmonised fuel economy standards, minimum energy performance standards for appliances, expanded EV charging networks, and mandatory energy management obligations would give the region progressively greater insulation against future shocks. Enforced standards give investors something to lend against, energy management brings demand down, and blended finance turns plans into infrastructure. Japan proved in the 1970s that the right response to an energy crisis can drive systemic change, and Malaysia demonstrated that fiscal returns from efficiency are rapid and measurable. ASEAN cannot prevent the next supply disruption, but it can decide how much of its economy stays exposed to one.
