It said the results in 18,089 polling stations were centralized until 9:30 a.m., accounting for 97.52% of a total of 18,548 polling stations.
Around 8,2 million people out of nearly 18 million registered voters cast ballots in the referendum, which translates into a turnout of 46.13%.
According to preliminary results, 87.55% of ballots were in favor of impeachment and 11.12% opposed.
The referendum required a voter turnout of more than 50% to be legally binding, which means Basescu will be reinstated.