The energy system is vast, complex and essential—a multitude of intertwined value chains that operate on a local, regional and global level with an installed infrastructure network that addresses movement across time and distance. We expect the system and the energy produced to be accessible, affordable, reliable, resilient, secure and increasingly low carbon. Ensuring the future energy system addresses these economic, environmental and equity expectations is one of the greatest challenges in our lifetime. And we expect this to happen in the next 25 years!