SK E&S will push ahead with a project in collaboration with the government to supply 1,000 hydrogen buses to Busan, as part of efforts to support the bid by the nation's second-largest city to host World Expo 2030. The energy company said Monday that it has signed a memorandum of understanding (MOU) with the Busan Metropolitan Government, the Ministry of Economy, Hyundai Motor, Busan Port Authority, Busan Metrobus Company Association and Busan Techno Park, to develop a hydrogen economy in the city.