World leaders and giants in the energy sector set to meet in Istanbul on Sunday in a world-class event that was last held in Turkey 40 years ago: The 23rd World Energy Congress, also known as the energy Olympics.

The countdown has started for the 23rd World Energy Congress in Istanbul, which runs through Oct. 9-13. The congress will be hosted by the Energy Ministry under the aegis of President Recep Tayyip Erdoğan, who will make a speech.

Over 250 speakers from 80 countries are expected to attend, and Prime Minister Binali Yıldırım and Energy and Natural Resources Minister Berat Albayrak will represent Turkey. Setting the agenda for the energy world, the congress will host over 60 politicians.

The list of attendees will include Iranian Energy Minister Hamid Chitchian, Saudi Arabian Energy, Industry and Mineral Resources Minister Khalid A. al-Falih, Russian Energy Minister Alexander Novak, Iraqi Electricity Minister Qasım M. al-Fahdawi, Algerian Energy Minister Noureddine Boutarfa, Energy Minister of the United Arab Emirates Suhail Mohammed Faraj Al Mazroui, Venezuela Oil Minister Eulogio Del Pino and Maros Sefcovic, the vice-president of the European Commission in charge of the Energy Union.