How the Iran War Disrupted ASEAN’s Energy Transition

Why It Matters

The crisis highlights ASEAN’s vulnerability to external supply shocks and shows that without robust grid integration and sustained investment, short‑term fossil‑fuel support could stall the region’s clean‑energy goals.

Key Takeaways

• Strait of Hormuz closure added $3.36 bn monthly import cost for ASEAN
• Coal generation surged, with Vietnam up 44% in March
• Governments leaned on subsidies and tax cuts to curb fuel price spikes
• Transition stays on track, yet ASEAN grid integration needs $327 bn funding

Pulse Analysis

The sudden shutdown of the Strait of Hormuz in March sent ripples through Southeast Asia’s energy markets, inflating import costs by roughly $3.36 billion per month. ASEAN’s dependence on Middle‑East oil—accounting for about 55 percent of its crude supply—meant that up to 28 percent of final oil consumption faced direct risk when shipments stalled. This shock forced governments to act quickly, deploying fiscal tools such as fuel subsidies, tax relief, and emergency imports to shield consumers from volatile prices. The episode laid bare the fragility of the region’s energy security architecture and reinforced the need for diversified supply sources.

In response, several ASEAN members turned to coal as a stop‑gap, with Vietnam’s coal‑fired generation jumping 44 percent month‑on‑month and Indonesia raising coal output quotas. Thailand re‑activated decommissioned coal units, while the Philippines declared a national energy emergency and ramped up coal generation despite already relying on coal for 60 percent of electricity. These short‑term measures, however, did not derail the broader transition agenda. Thailand revised its rooftop‑solar policies, Cambodia cut import taxes on EVs and solar devices, and Indonesia launched a 1.2 GW solar tender, signaling continued commitment to renewables amid the crisis.

Looking ahead, the crisis underscores the strategic importance of the ASEAN Power Grid, a regional interconnector project projected to require $27 billion for transmission lines and $300 billion for broader grid upgrades by 2040. With only about $2 billion invested in cross‑border interconnectors over the past five decades, financing remains a major hurdle. While a fully integrated grid may be out of reach in the near term, sub‑regional power trade and domestic market reforms can improve grid resilience and support the transition. Balancing immediate fossil‑fuel relief with targeted investment in clean infrastructure will determine whether ASEAN emerges stronger or sees its decarbonisation momentum erode.