The transportation sector is a major contributor to emissions and air pollution in major cities. Transportation consumes approximately one quarter of the total global fossil fuel supply, and a large portion of this supply is consumed by road transport.

With more than 14% of total global emissions, the transportation industry is one of the major contributors to rising GHG emissions [1]. The 2020 International Energy Agency (IEA) report (Tracking Transport 2020) found that transportation is responsible for 24% of direct CO₂ emissions from fuel combustion. The main problem is that emissions from this sector are projected to rise over time, up to 70% by 2050 based on a business-as-usual scenario [1]. In the 21st century, electric vehicles have captured the attention of the global automobile industry; according to recent research, three areas hit a 90% sales record in 2019 [2]: the USA, Europe, and China, which sold around 0.326 million, 0.56 million, and 1.06 million electric vehicles, respectively. In 2020, the global electric-car stock exceeded USD 10 million. The region-specific distribution is illustrated in Figure 1 for 2019 and 2020.

In 2019, annual global electric vehicle sales increased by 14%, accounting for 80% in Europe and 43% in Canada, with steady sales in China and the United States. Furthermore, EV adoption has globally increased, including in Norway (39.6%), Hong Kong (10.61%), the United States (3.32%), the United Kingdom (1.94%), and China (2.41%) ^[3][4][3,4]. EVs have various advantages, including fewer GHG emissions, safety, cost savings, and low maintenance, and offer a long-term solution to environmental concerns, as shown by their current acceptance rate and predicted improvement. Thus, EVs are an alternative to internal-combustion engine vehicles (ICEVs), and can provide sustainable transportation [5]. Electric vehicles have the potential to reduced reliance on fossil fuels. There are many varieties of EVs on the market, including hybrid electric vehicles (HEV) and plug-in electric cars.

Although EVs are environmentally friendly, they pose a number of problems for the distribution system, including increased system load due to PEV charging, which reduces substation reserve capacity and feeder load transfer capabilities, EV charging peaks, and traditional distribution loads. The European Union’s (EU) energy laws include a policy for distribution system operators (DSO); the rest of the world is yet to implement such a policy. Furthermore, inconstancy in electric vehicle operating patterns causes consumer preferences to change [6]. The impact of electric vehicle market integration on utility distribution load profiles has also received much attention. Charging an electric vehicle battery may use up to twice as much energy as that of a typical home. This would be quite the challenge to power system management when the adoption of EVs is more widespread [7]. Denmark pursued a project for electric vehicle battery storage in order to facilitate large-scale wind-power integration [8]. The vehicle-to-grid concept allows for EV owners to provide power from a battery to the grid during peak consumption. This concept could ensure grid reliability and flexibility.

In Thailand, the total final energy consumption in 2017 was 80,752 kton. The transport sector’s portion of this consumption constituted about 40.1% [9]. Road transportation activities in Thailand were estimated to be 77.05% of total transport activities. Registered vehicles in Thailand rose from 26.42 million in 2008 to 38.31 million in 2017 [10]. Key challenges of road transport in Thailand include the rapid growth of vehicles, which increases energy demand, thereby contributing to GHG emissions and air pollution as particulate matter (PM2.5). With regard to fuel consumption by fuel type, diesel constituted the highest with 43%, followed by gasoline, jet fuel, natural gas, liquefied petroleum gas (LPG) and fuel oil at 25%, 17%, 7%, 5%, and 3%, respectively. As alternatives, biodiesel, ethanol, natural gas, hydrogen, and electricity are used as fuel for vehicles [5].

The Thai government launched policies to promote EVs in 2015, which marked the beginning of EV policy in Thailand. However, the adoption of EVs is quite low, at 0.32% of the total number of registered vehicles (i.e., 123,967 EVs compared to 38.31 million cars registered with the Department of Land Transportation) [11].

Several EV policies have been launched for widespread EV adoption in the long run. The Energy Efficiency Plan (EEP2015) set a target of 1.2 million EVs by 2036 ^[12][13][12,13]. The National Science and Technology Development Agency (NSTDA) issued a plan for Thailand to be an ASEAN BEV hub, including the capacity to produce 1000 electric buses a year and develop prototype modified EVs [14]. In addition, the customs department and the Board of Investment of Thailand provided EV investments by creating tax incentives for investors, customs deductions for imported EVs, and EV parts and equipment [15]. Therefore, it is more interesting to investigate barriers to EV adoption than ICEVs, as it is essential to help develop innovative policy incentives and the wider adoption of EVs in Thailand.

Country-specific barrier and factor identification towards EV adoption can be found in the literature for countries such as in India ^[16][17][16,17] and Norway [18]. Although this may be true, a recent review compiled a list of countrywide EV-related scientific articles [19] and revealed that no study has been conducted for Thailand; this justifies the novelty of the present work. Therefore, this study investigated the factors that influence EV adoption in Thailand using an online questionnaire survey. Research questions included what the barriers to widespread adoption of EVs are, and whether these factors affect public acceptance of EVs.