The international Doctoral Network 'Unite!Energy' is at the forefront of research into the role of hydrogen as a chemical energy storage medium for the energy transition. With a focus on addressing the mismatch between renewable energy production and demand, the project emphasizes the importance of storing and transporting energy effectively. By utilizing electrolysis to produce 'green' hydrogen from renewable energy sources, the researchers aim to store excess electrical energy and utilize it efficiently during peak demand periods. Twelve PhD students are collaborating with industry and research partners to investigate the application of hydrogen for energy storage and power generation. The project, funded by the EU as a Marie Skłodowska-Curie action with around 3.2 million euros, aims to train a new generation of researchers adept at integrating hydrogen technologies in the energy sector. The research involves a tandem approach where PhD students work with researchers from different universities within the Unite! network, culminating in a joint doctorate. By exploring the potential of hydrogen as a sustainable energy storage solution, the project seeks to enhance the competitiveness of chemical energy storage and contribute to the energy transition. Overall, 'Unite!Energy' represents a significant step towards leveraging hydrogen for a more sustainable and efficient energy system, aligning with the broader goals of the Unite! alliance in promoting innovation, technology, and engineering across Europe.