Gen Prayuth said he wanted Cambodia to discuss the plan with other Asean members first.
He was speaking after Hun Sen raised the matter at the 30th Asean Ministers Meeting on Energy in Phnom Penh, Cambodia, last month.
The meeting, themed Asean Green Connectivity, aimed to boost co-operation in the energy sector among the bloc’s members and promote the efficient use of energy, green energy and an integrated Asean power grid.
Hun Sen said during the meeting that he was interested in building a nuclear power plant in Koh Kong province to pave the way for economic expansion in the country.
Energy Minister Arak Chonlatanon, who also attended the meeting, said he was worried about the plan as Thailand would surely be affected by it.
A Foreign Ministry official said Hun Sen’s plan was too ambitious as the area still lacked proper public infrastructure systems for construction of a nuclear power plant. He said Cambodia was only conducting a feasibility study to build a coal power plant in Koh Kong province and was inviting Thai companies to invest in the construction.