The evolution of the electrical energy system toward a smart model has already started. Smart metering, electric vehicles, renewable resources, transmission and distribution advanced grid automation are some example of this ongoing change. A further step in this process is the interaction between final customers - often residential - and the distribution grid. Those customers shall provide new services to the distribution utility which can help them to better and more safely manage the grid. The SmartDomoGrid project - cofounded by the Italian Ministry of Economic Development - is aimed at designing, implementing and testing a possible scheme for the grid-customer interaction in a real operation environment. The paper is focused on the architecture and several use cases proposed and analyzed within the project.