Group 1 - The city of Belgrade plans to procure a total of 100 new electric buses for the upcoming World Expo, with 50 powered by batteries and 50 using supercapacitors [1][4] - The procurement method for these buses will be direct negotiation, with an estimated cost of approximately €150 million (around 1.257 billion RMB) [4] - The buses will include 15 double-articulated buses measuring 25 meters in length, set to be operational before the Expo in mid-2027 [3][4] Group 2 - After the Expo concludes, the electric buses will be handed over to GSP Belgrade, the public transport operator in Belgrade [4] - Belgrade is simultaneously expanding its charging infrastructure, including the installation of charging stations at bus terminals [4]