Fleet Electrification Is Already Happening Across ASEAN What Is Holding It Back? What to Consider If You Are Planning the Transition Diesel and Electric Will Run Side by Side for Years But First, Manage the Fleet You Have Today In March 2026, the closure of the Strait of Hormuz showed what diesel dependency actually costs. Oil surged above US$100 per barrel. Diesel in the Philippines breached P100 per litre. Thailand imposed emergency price caps. The Philippines moved government offices to a four-day working week to conserve fuel. Across ASEAN, refineries cut output as crude availability tightened.¹
For fleet operators, every one of those headlines made a direct hit on their operating budgets. Diesel is typically a fleet’s second-largest expense after labour, and in March, it became the least predictable. When a crisis 7,000 kilometres away can double your fuel costs in under a week, the case for rethinking oil dependency stops being theoretical.
This is not an argument that electrification would have insulated fleets entirely, because it would not. But it accelerates a discussion that was already underway. Fleet operators across ASEAN were already exploring alternative energy sources for sound operational reasons. The fuel crisis has made that conversation urgent rather than optional.
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Fleet Electrification Is Already Happening Across ASEAN
The shift is not hypothetical. Grab has partnered with BYD to bring up to 50,000 electric vehicles onto its platform across six ASEAN countries.² Pos Malaysia is expanding the country’s largest all-electric logistics fleet.³ DHL Express has introduced electric delivery vans in Thailand.⁴ GoJek has committed to converting its entire motorcycle fleet to electric by 2030.² Meanwhile, e-commerce fulfilment fleets in the region are reporting 20–30% fuel savings with electric last-mile delivery, and EV maintenance costs run approximately 40% lower than ICE equivalents.⁵ ⁶
The IEA reports regional EV sales grew nearly 50% in 2024, with one in four cars sold in Southeast Asia projected to be electric by 2030.⁷ The direction of travel is clear. However, the question for fleet operators is what stands between them and a successful transition.
What Is Holding It Back?
The barriers are specific to the region. Charging infrastructure is expanding but unevenly distributed: Thailand has over 3,700 stations, Singapore over 15,300, but coverage thins rapidly outside major cities.⁸ For fleet operators, the issue is not total charger count but whether infrastructure sits on your routes and aligns with your schedules.
Upfront costs remain the most cited barrier, and grid readiness is a constraint in markets where electricity networks are not yet equipped for mass fleet charging.⁹ Battery degradation in tropical climates is a documented concern: a 2026 study published in Nature Climate Change found that EV batteries in the hottest regions can lose up to 30% of their lifetime compared to those in temperate conditions, though newer battery chemistries are reducing this gap significantly.¹⁰ A separate experimental study monitoring EV batteries in tropical conditions over two years confirmed that high temperatures, humidity, and poor road quality all directly correlate with accelerated degradation.¹¹ In Southeast Asia, these are not edge cases. They are baseline operating conditions, and a factor to plan for, not discover.
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What to Consider If You Are Planning the Transition
For fleet operators evaluating electrification, the decision is less about the vehicles themselves and more about the operational changes they introduce. Several factors are worth assessing before the first EV enters the fleet.
Total Cost of Ownership
Compare lifetime costs, not purchase price. EVs carry higher upfront costs, but lower fuel and maintenance expenses shift the economics over a three to five-year cycle.
The calculation varies significantly by market, route profile, and available incentives. Thailand, Indonesia, and Vietnam are narrowing the gap with subsidy programmes and tax exemptions.
Run the maths against your specific operation, not regional averages.
Charging Infrastructure
Plan charging alongside fleet procurement, not after it. Depot-based overnight charging is the lowest-cost and lowest-stress option for batteries, but it requires electrical capacity assessment and potentially grid upgrades.
For routes that exceed single-charge range, access to reliable public charging or battery swap networks becomes an operational dependency, not a convenience.
Battery Health Management
Charging behaviour, heat exposure, and charge level discipline are the three operator-controllable factors that most influence battery longevity.
Research published in Nature Climate Change confirms that charging behaviour and climate are the dominant factors in battery longevity. Newer battery chemistries are more resilient, but high-power DC fast charging remains a significant stressor that can substantially accelerate degradation rates.¹⁰
For a fleet of 50 vehicles, that gap translates to hundreds of thousands of dollars in premature replacement costs.
Fleet Management Readiness
Your fleet management system needs to support both powertrains from day one.
Introducing EVs into a fleet managed by diesel-era software creates blind spots: no battery health monitoring, no charge scheduling, no range-aware route planning.
These capabilities need to be in place before the vehicles arrive, not retrofitted afterwards.
Talk to us about preparing your fleet for electrification
Diesel and Electric Will Run Side by Side for Years
Full electrification is not imminent. Even in Singapore, Deloitte’s 2025 survey found hybrid preference at 31%, versus 28% for battery EVs.⁸ The practical outcome is mixed fleets for years to come. The fuel crisis may accelerate the transition, but it is unlikely to skip the transitional phase.
This creates the most immediate management challenge. A platform built for diesel was not designed to monitor battery state of health, optimise charging windows, or integrate range constraints into route planning. An EV-only tool ignores the ICE vehicles that still make up the majority of most fleets. What operators need is unified monitoring across all powertrain types, with consolidated reporting and different parameters applied automatically by vehicle type.
See how SAAN Track manages diesel, hybrid, and electric vehicles from a single platform
But First, Manage the Fleet You Have Today
While the direction of fleet electrification in ASEAN is clear, the timeline is not. For most operators the transition will take years, and the fuel invoice arrives this month. The 2022 Ukraine crisis was a warning about energy dependency, and March 2026 confirmed it.
The case for diversification is building, but the immediate priority is reducing exposure within your existing diesel operations. Industry research and our own telemetry consistently show that 10–15% of fleet fuel expenditure is lost to inefficiency, idling, route deviation, and unaccounted use. In the current price environment, those losses have grown in absolute terms alongside the price of diesel itself. Recovering them does not require fleet replacement. It requires fleet visibility.
Start with your current fleet – try the Fuel Cost Leakage Calculator
Sources
1. Al Jazeera, Southeast Asia Shuts Offices, Limits Travel as Oil Crisis Deepens, March 2026; The Diplomat, Southeast Asia Reels from Middle East Oil Supply Shortages, March 2026; IEA, Oil Market Report, March 2026
2. Grab, Grab and BYD Enter Strategic Partnership to Expand EV Fleet Offering Across Southeast Asia, January 2025
3. Electrive, Malaysia’s Largest All-Electric Logistic Fleet Grows Bigger, September 2025
4. DHL Express Thailand, Sustainable Logistics with Electrification of Delivery Fleet in Thailand
5. Mordor Intelligence, ASEAN Electric Vehicle Market Report 2025–2030
6. International Energy Agency, Global EV Outlook 2024 and 2025: EV Total Cost of Ownership and Maintenance Cost Analysis
7. International Energy Agency, Global EV Outlook 2025: Trends in Electric Car Markets
8. TechWire Asia, Southeast Asia’s EV Infrastructure Reality, January 2026; Deloitte, 2025 Consumer EV Survey (6,029 respondents, six ASEAN countries)
9. Beacon Venture Capital, Accelerating EV Adoption in Southeast Asia, June 2025
10. Wu et al., Technological Improvements in EV Batteries Offset Climate-Induced Durability Challenges, Nature Climate Change, March 2026
11. ScienceDirect, Experimental Characterisation of Electric Vehicle Battery Degradation in Tropical Environments: Influence of Climatic Factors and Local Driving Conditions, February 2026
