Researchers at Harvard and Greenpeace say the demand for electricity in Southeast Asia is projected to increase by a staggering 83% between 2011 and 2035 -- twice the global average.
"Air pollution in China and India has received a lot of scientific attention," said Harvard University's Shannon Koplitz, a lead researcher in the project, in a statement.
However, she says the "impacts of planned coal power expansion in the rest of the Southeast and East Asian region have been understudied."
The peer-reviewed study cites economic development, population growth and urban migration as reasons for the huge leap in energy demand, and says that in Southeast Asia -- unlike in the US, Europe, China or India -- these demands are still likely to be met by coal-fired power plants rather than renewable energy. It states the public health consequences could be "severe."
"Reliance on coal in emerging Southeast Asian countries will have substantial and long-lasting impacts on air quality and public health," says Koplitz.
The report estimates that approximately 20,000 people in the region die every year from coal-fired power station emissions, and it projects this number will increase to 70,000 by 2030 if all the proposed power plant projects in the region go ahead.
The number of power stations in Indonesia is projected to more than double, from 147 to 323. Myanmar is expected to see its current number grow more than five times, from three to 16. Developed nations like South Korea and Japan are also increasing their coal-fired power station numbers, says the report.
Emissions from coal in Southeast Asia will therefore triple by 2030, with the largest increases in Indonesia and Vietnam, it says.
However, some analysts argue that the damage these nations are doing is just a drop in the ocean.
An estimated 100,000 people die annually from coal-fired power plants in India.
"To present Indonesia as the bad case compared with US, China and India is not fair. China consumes 40 times the coal Indonesia consumes," said a spokesperson for the International Energy Agency.
"The IEA is very clear that the countries should explore all the potential for low carbon energy, but also that energy poverty is an important issue in many countries in the world," an agency spokesperson told CNN.
Lauri Myllyvirta, an air pollution specialist with Greenpeace and one of the authors of the study, argues that China and India are at least making very real changes to their energy landscape.
"China is the world's uncontested leader in adding renewable power capacity," he says, adding that since 2013 any increase in demand for electricity in China has been fully covered by clean energy. He also says that India is also on track to meet "impressive renewable energy targets."
"I very much hope that air pollution does not have to reach the horrendous levels we are currently witnessing in China and India before action is taken to shift to clean energy," he says.
Coal's "low cost and domestic abundance" is why, according to the report, countries like Indonesia and Vietnam are still forging ahead with fossil fuels, despite the obvious negative impact on air quality.
IEA analysts argue that attractive government incentives and long-term energy sector planning would help Southeast Asian nations prioritize renewable technology in the face of ambitious development targets and accessible, affordable coal.
"To reach competitive power generation costs, the renewable energy industry needs to reach a certain scale," says Myllyvirta. "This renewable energy take-off has not happened yet in most of the countries in our study."