Thailand’s ambitious plan to expand rooftop solar installations faces challenges as high upfront costs may limit the benefits for lower-income households, despite government subsidies.
The Thai government announced on September 2 a 50 billion baht initiative aimed at encouraging up to 1 million households to install solar panels generating a combined 5 gigawatts of power. The initiative, aimed at reducing reliance on imported liquefied natural gas and insulating consumers from volatile electricity prices, was subsequently expanded, with officials indicating a revised target of 1.5 million households and 10 gigawatts of installed capacity.
The program offers a 50,000 baht subsidy toward installation costs, but households are still responsible for covering the remainder of expenses, which can range between 100,000 and 200,000 baht for a typical rooftop system sufficient to power an average family home. For many, especially those with lower electricity consumption and limited financial resources, this upfront cost remains a significant barrier.
Toey Wattana Mongkhonman, a Muay Thai trainer living in the northeastern province of Yasothon, typifies the target demographic that might struggle to benefit fully from the scheme despite the subsidy. With a household of five, Toey’s monthly electricity bill ranges between 1,000 and 1,500 baht, but he does not expect to generate income through selling surplus solar power; his primary goal is to reduce grid electricity purchases.
Energy analysts emphasize that higher-consuming households stand to gain more from rooftop solar, as their higher daytime electricity use allows them to offset a larger portion of grid purchases. “Those with higher electricity use, especially during the day, are likely to save more,” said Evan Ng, a consulting lead for Siemens Energy’s Asia-Pacific energy transformation team. Conversely, households with lower usage may see limited savings and still face the upfront installation costs.
Thailand’s tiered residential electricity tariff structure means the value of solar energy consumed on-site is higher for those with greater consumption, while the fixed rate of 2.20 baht per kWh paid for surplus electricity sold back to the grid is relatively low. This dynamic could disincentivize small consumers from installing solar systems geared toward selling excess power.
Haneea Isaad, an energy finance specialist with the Institute for Energy Economics and Financial Analysis, noted that the effective payback period for rooftop solar installations could be reduced by about 18 months to two years with the subsidy. However, she cautioned that the impact of the program depends heavily on specific financing mechanisms, system size requirements, and eligibility rules. If uptake primarily occurs among higher-demand households, the scheme risks deepening a “rooftop solar divide” between wealthier and poorer consumers. According to Isaad, direct capital reductions and access to affordable financing may be more critical incentives for lower-income families, who typically consume much of their solar power on-site.
Beyond financial aspects, technical limitations also pose concerns. The ability of local distribution networks to accommodate a large influx of distributed generation is uncertain. Ng highlighted that while Thailand’s thermal power plants provide system-wide flexibility, constraints could emerge at the feeder or transformer level if many rooftop systems feed surplus electricity into the grid simultaneously. Employing smart meters and digital network models could help identify optimal locations for new connections and expedite application processing.
For individuals like Toey, the government’s subsidy could ease the cost burden but may not entirely offset the financial challenge of installing solar panels. “My family would still have to find more money to cover the cost of the solar panels,” he said, underscoring the ongoing accessibility issues despite the government’s renewable energy push.