Making cities smarter is a great challenge. But this makes sense only if the cities are also sustainable. In our context of rapid climatic changes, tackling as a first concern the ecologic part of smart cities is the key.
Created in December 2015, eG4U (e.green for users)  is dedicated to finding and experimenting solutions for building a smart and sustainable cities. In this context, eG4U is creating a technical and normative framework applying to energy optimization and supporting the business development of the members. It is helping them to be compliant with EU energy regulation.
The goals eG4U want to achieve will need a massive collection of data and analysis. As an example, a lot of data will be needed in order to allow smart grids to dynamically route energy produced in some parts of the network to other parts where it could be used by consumers. For the purpose of distributed collection of data illustrated by this example, CEA has introduced Eclipse sensiNact during the “Making Smart Cities Sustainable” workshop. Eclipse sensiNact  is an integration middleware developed thanks to the Brain IoT project. The goal of Eclipse sensiNact is to collect data from heterogeneous and distributed sources. The data are then transformed to have their data model aligned. This allows aggregation and synthesis to produce high level knowledge, which is required for the optimization of energy consumption in cities.