GO15, the association of the Very Large Power Grid Operators, represents more than half of the world’s electricity demand. Created in 2004 after several blackouts had occurred, this unique organization is dedicated to high level exchanges. It offers industry leaders the opportunity to address major strategic and technical issues affecting the safety, the reliability and the sustainability of power systems. Convinced that the transmission grid and a resilient power system are key to energy transition, GO15 aims to favor bilateral and multilateral international collaboration to prepare a sustainable future.