Due to a high penetration by renewables and a strong trend towards decentralization, future energy grids exhibit an increasingly emergent behavior. As a consequence new engineering approaches, based on decentralized decision making, have been proposed. The Agent. HyGrid project provides a framework for the design, development and testing of energy infrastructures. However, in contrast to other approaches it allows the designer to consider all kinds of energy, not only electrical power but also, e.g., gas or heat. It was shown in small-scale scenarios, that the developed software artifacts were reusable in on-site systems. This avoids the redundancy, which is otherwise created by re-implementing the software for different systems. By closing the gap between simulation environments, hybrid hard-and software test-beds and real on-site applications, the Agent. HyGrid project intends to demonstrate that such systematic and seamless software development processes and the according tool chain are already viable today.