Earlier this month, Washington announced plans for hefty duties on solar panels made in Cambodia, Vietnam, Thailand and Malaysia.
The levies follow an investigation, launched before US President Donald Trump took office, into "unfair practices" in the countries, particularly by Chinese-headquartered firms.
If approved next month, they will pile upon tariffs already imposed by the Trump administration, including blanket 10-percent levies for most countries, and 145 percent on Chinese-made goods.
For the US market, the consequences are likely to be severe. China makes eight out of every 10 solar panels globally, and controls 80 percent of every stage of the manufacturing process.
The new tariffs "will practically make solar exports to US impossible commercially", said Putra Adhiguna, managing director at the Energy Shift Institute think tank.
Southeast Asia accounted for nearly 80 percent of US solar panel imports in 2024.
And while investment in solar production has ramped up in the United States in recent years, the market still relies heavily on imported components.
For Chinese manufacturers, already dealing with a saturated domestic market, the raft of tariffs is potentially very bad news.
Many shifted operations to Southeast Asia hoping to avoid punitive measures imposed by Washington and the European Union as they try to protect and nurture domestic solar industries.
The proposed new duties range from around 40 percent for some Malaysian exports to an eye-watering 3,521 percent for some Cambodia-based manufacturers.
- Tariffs 'accelerate' transition -
But there may be a silver lining for the region, explained Ben McCarron, managing director at Asia Research & Engagement.
"The tariffs and trade war are likely to accelerate the energy transition in Southeast Asia," he said.
China will "supercharge efforts" in regional markets and push for policy and implementation plans to "enable fast adoption of green energy across the region", driven by its exporters.
Analysts have long warned that countries in the region are moving too slowly to transition from planet-warming fossil fuels like coal.
"At the current pace, it (Southeast Asia) risks missing out on the opportunities provided by the declining costs of wind and solar, now cheaper than fossil fuels," said energy think tank Ember in a report last year.
For example, Malaysia relied on fossil fuels for over 80 percent of its electricity generation last year.
It aims to generate 24 percent from renewables by 2030, a target that has been criticised as out of step with global climate goals.
The tariff regime represents a double opportunity for the region, explained Muyi Yang, senior energy analyst at Ember.
So far, the local solar industry has been "largely opportunistic, focused on leveraging domestic resources or labour advantages for export gains", he told AFP.
Cut off from the US market, it could instead focus on local energy transitions, speeding green energy uptake locally and driving a new market that "could serve as a natural hedge against external volatility".
Still, replacing the US market will not be easy, given its size and the relatively nascent state of renewables in the region.
"Success hinges on turning this export-led momentum into a homegrown cleantech revolution," said Yang.
"Clearance prices" may be attractive to some, but countries in the region and beyond may also be cautious about a flood of solar, said Adhiguna.
Major markets like Indonesia and India already have measures in place intended to favour domestic solar production.
"Many will hesitate to import massively, prioritising trade balance and aims to create local green jobs," he said.
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