The projects meant a combined investment of 16.67 billion baht ($528.7 million), the board said in a statement.
The Thai unit of Japanese carmaker Toyota would invest 4.64 billion baht in a plant with the capacity to assemble 100,000 so-called eco cars a year expected to start production in 2012, it said.
Half that production would be for export, mainly to Southeast Asia and the Asia-Oceania region, it said.
Mitsubishi Motors (Thailand) would spend 4.7 billion baht on a plant with an annual capacity of 107,000 eco cars, 88 percent of them for export, with production scheduled for 2010, it said.
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