He denied as baseless a report on Wednesday that the planned polls would be postponed.
The royal decree on the general election is still in place and the EC is duty-bound to comply with it, said Mr Supachai.
Asked about the report that the EC would hold a major press conference on the planned election today, Mr Supachai said he had no knowledge of it.
The EC chairman said it was possible the election commissioner in charge of election management, Somchai Srisuthiyakorn, might have something to say.
Mr Supachai insisted there was no pressure for him to step down from his post.
He said he is newly appointed and if he resigns as EC chairman he would be unemployed.