
EC chairman Abdul Ghani Salleh had earlier told reporters, after a visit to the polling centres, that the commission was expecting a turnout of at least 70%.
The nine polling stations, with a total of 30 channels, opened at 8am and are scheduled to close at 6pm.
The result is expected to be announced by 9pm.
The by-election is being held following the death of Umno assemblyman and Pahang exco member Johari Harun in the plane crash near Bandar Elmina in Shah Alam on Aug 17.
It features a three-cornered fight involving Barisan Nasional’s Amizar Abu Adam, Perikatan Nasional’s Kasim Samat and independent candidate Haslihelmy DM Zulhasli.
Pelangai has 16,456 eligible voters, including 36 police personnel and three overseas absentee voters.