The retallying of presidential ballot papers from the 15 contested polling stations is underway at Forodha House, Nairobi.
Supreme Court officials on Wednesday received at least 45 ballot boxes from polling stations where the court ordered a recount.
The seven-judge bench led by Chief Justice Martha Koome on Tuesday ordered IEBC officials to present the ballots for the recount in Nairobi.
The judges ordered this during a pretrial conference of the presidential petition filed by the Azimio La Umoja One Kenya Alliance.
The polling stations are Nandi Hills and Sinendeti primary schools, and Tinderet Conmo in Nandi county.
Others are Belgut, Kapsuser and Chepkutum primary schools in Kericho county; Jomvu, Mikindani, Ministry of Water, Mvita and Majengo primary schools in Mombasa county.
A recount of ballots from Jarok, Gathanji and Kiheo primary schools in Nyandarua county are also ongoing.
Azimio presidential candidate Raila Odinga and his running mate Martha Karua are challenging the win of President-elect William Ruto at the apex court.
The court ordered the recount to be conducted within 48 hours and end on Thursday at 2pm and a report filed in court.
