This year’s PowerWeb conference, "Optimizing Today's Energy System for a Better Tomorrow," was successfully organized by the Faculty of Mechanical Engineering of TU Delft. Presentations focused on research and insights addressing the following critical challenges around the electrical grid. With the energy transition, society will increasingly run on renewable electricity. However, the current electrical grid is not designed to handle such massive demand, and is already experiencing substantial stress. Renewable energy can also be intermittent (think: the sun does not shine 24/7), which can cause energy shortages or surpluses. In addition, some sectors, such as those that use heavy-duty vehicles (e.g. ships, ground, aviation), cannot run solely on electricity with current technology and need other forms of sustainable energy storage (e.g. hydrogen).