Transcontinental grid interconnection and clean energy development for sustainability are the prime objectives to address through global energy interconnection (GEI) platform. Key issues can be solved through GEI such as environmental pollution, climate change, resources scarcity and unbalanced development. The growing concern of fossil fuel depletion leads to the exploitation of renewable energy which is mostly located on Arctic and Equator zones. This study addresses about the importance, current projects and research directions of clean energy, smart grid, ultra‐high voltage transmission, grid interconnection trends around the world in order to globally interconnect the future grid. The review results provide comprehensive background knowledge to all the researchers in order to investigate further into the field.