Nikhom Vairatpanich, vice-president of the Senate, said senators could not nominate themselves and that each candidate would be given 10 minutes to speak about their vision for the Senate before votes are cast.
Additional rounds of voting would be held should two or more candidates win the same number of votes.
So far, five contenders have emerged with appointed Senator Pichaet Sunthornpipit leading the pack.
The Nation